void
erts_queue_dist_message(Process *rcvr,
ErtsProcLocks rcvr_locks,
ErtsDistExternal *dist_ext,
Eterm token,
Eterm from)
{
ErtsMessage* mp;
erts_aint_t state;
ERTS_LC_ASSERT(rcvr_locks == erts_proc_lc_my_proc_locks(rcvr));
mp = erts_alloc_message(0, NULL);
mp->data.dist_ext = dist_ext;
ERL_MESSAGE_FROM(mp) = dist_ext->dep->sysname;
ERL_MESSAGE_TERM(mp) = THE_NON_VALUE;
#ifdef USE_VM_PROBES
ERL_MESSAGE_DT_UTAG(mp) = NIL;
if (token == am_have_dt_utag)
ERL_MESSAGE_TOKEN(mp) = NIL;
else
#endif
ERL_MESSAGE_TOKEN(mp) = token;
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ)) {
if (erts_proc_trylock(rcvr, ERTS_PROC_LOCK_MSGQ) == EBUSY) {
ErtsProcLocks need_locks = ERTS_PROC_LOCK_MSGQ;
ErtsProcLocks unlocks =
rcvr_locks & ERTS_PROC_LOCKS_HIGHER_THAN(ERTS_PROC_LOCK_MSGQ);
if (unlocks) {
erts_proc_unlock(rcvr, unlocks);
need_locks |= unlocks;
}
erts_proc_lock(rcvr, need_locks);
}
}
state = erts_atomic32_read_acqb(&rcvr->state);
if (state & ERTS_PSFLG_EXITING) {
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ))
erts_proc_unlock(rcvr, ERTS_PROC_LOCK_MSGQ);
/* Drop message if receiver is exiting or has a pending exit ... */
erts_cleanup_messages(mp);
}
else {
LINK_MESSAGE(rcvr, mp);
if (rcvr_locks & ERTS_PROC_LOCK_MAIN)
erts_proc_sig_fetch(rcvr);
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ))
erts_proc_unlock(rcvr, ERTS_PROC_LOCK_MSGQ);
erts_proc_notify_new_message(rcvr, rcvr_locks);
}
}
static void
dump_process_info(int to, void *to_arg, Process *p)
{
Eterm* sp;
ErlMessage* mp;
int yreg = -1;
ERTS_SMP_MSGQ_MV_INQ2PRIVQ(p);
if ((p->trace_flags & F_SENSITIVE) == 0 && p->msg.first) {
erts_print(to, to_arg, "=proc_messages:%T\n", p->id);
for (mp = p->msg.first; mp != NULL; mp = mp->next) {
Eterm mesg = ERL_MESSAGE_TERM(mp);
if (is_value(mesg))
dump_element(to, to_arg, mesg);
else
dump_dist_ext(to, to_arg, mp->data.dist_ext);
mesg = ERL_MESSAGE_TOKEN(mp);
erts_print(to, to_arg, ":");
dump_element(to, to_arg, mesg);
erts_print(to, to_arg, "\n");
}
}
if ((p->trace_flags & F_SENSITIVE) == 0) {
if (p->dictionary) {
erts_print(to, to_arg, "=proc_dictionary:%T\n", p->id);
erts_deep_dictionary_dump(to, to_arg,
p->dictionary, dump_element_nl);
}
}
if ((p->trace_flags & F_SENSITIVE) == 0) {
erts_print(to, to_arg, "=proc_stack:%T\n", p->id);
for (sp = p->stop; sp < STACK_START(p); sp++) {
yreg = stack_element_dump(to, to_arg, p, sp, yreg);
}
erts_print(to, to_arg, "=proc_heap:%T\n", p->id);
for (sp = p->stop; sp < STACK_START(p); sp++) {
Eterm term = *sp;
if (!is_catch(term) && !is_CP(term)) {
heap_dump(to, to_arg, term);
}
}
for (mp = p->msg.first; mp != NULL; mp = mp->next) {
Eterm mesg = ERL_MESSAGE_TERM(mp);
if (is_value(mesg))
heap_dump(to, to_arg, mesg);
mesg = ERL_MESSAGE_TOKEN(mp);
heap_dump(to, to_arg, mesg);
}
if (p->dictionary) {
erts_deep_dictionary_dump(to, to_arg, p->dictionary, heap_dump);
}
}
}
Uint
erts_msg_attached_data_size_aux(ErtsMessage *msg)
{
Sint sz;
ErtsDistExternal *edep = erts_get_dist_ext(msg->data.heap_frag);
ASSERT(ERTS_SIG_IS_EXTERNAL_MSG(msg));
if (edep->heap_size < 0) {
sz = erts_decode_dist_ext_size(edep, 1);
if (sz < 0) {
/* Bad external
* We leave the message intact in this case as it's not worth the trouble
* to make all callers remove it from queue. It will be detected again
* and removed from message queue later anyway.
*/
return 0;
}
edep->heap_size = sz;
} else {
sz = edep->heap_size;
}
if (is_not_nil(ERL_MESSAGE_TOKEN(msg))) {
sz += msg->data.heap_frag->used_size;
}
return sz;
}
Uint
erts_msg_attached_data_size_aux(ErtsMessage *msg)
{
Sint sz;
ASSERT(is_non_value(ERL_MESSAGE_TERM(msg)));
ASSERT(msg->data.dist_ext);
ASSERT(msg->data.dist_ext->heap_size < 0);
sz = erts_decode_dist_ext_size(msg->data.dist_ext);
if (sz < 0) {
/* Bad external; remove it */
if (is_not_nil(ERL_MESSAGE_TOKEN(msg))) {
ErlHeapFragment *heap_frag;
heap_frag = erts_dist_ext_trailer(msg->data.dist_ext);
erts_cleanup_offheap(&heap_frag->off_heap);
}
erts_free_dist_ext_copy(msg->data.dist_ext);
msg->data.dist_ext = NULL;
return 0;
}
msg->data.dist_ext->heap_size = sz;
if (is_not_nil(msg->m[1])) {
ErlHeapFragment *heap_frag;
heap_frag = erts_dist_ext_trailer(msg->data.dist_ext);
sz += heap_frag->used_size;
}
return sz;
}
static int
within2(Eterm *ptr, Process *p, Eterm *real_htop)
{
ErlHeapFragment* bp = MBUF(p);
ErlMessage* mp = p->msg.first;
Eterm *htop = real_htop ? real_htop : HEAP_TOP(p);
if (OLD_HEAP(p) && (OLD_HEAP(p) <= ptr && ptr < OLD_HEND(p))) {
return 1;
}
if (HEAP_START(p) <= ptr && ptr < htop) {
return 1;
}
while (bp != NULL) {
if (bp->mem <= ptr && ptr < bp->mem + bp->used_size) {
return 1;
}
bp = bp->next;
}
while (mp) {
if (mp->data.attached) {
ErlHeapFragment *hfp;
if (is_value(ERL_MESSAGE_TERM(mp)))
hfp = mp->data.heap_frag;
else if (is_not_nil(ERL_MESSAGE_TOKEN(mp)))
hfp = erts_dist_ext_trailer(mp->data.dist_ext);
else
hfp = NULL;
if (hfp && hfp->mem <= ptr && ptr < hfp->mem + hfp->used_size)
return 1;
}
mp = mp->next;
}
return 0;
}
void
erts_cleanup_messages(ErtsMessage *msgp)
{
ErtsMessage *mp = msgp;
while (mp) {
ErtsMessage *fmp;
ErlHeapFragment *bp;
if (is_non_value(ERL_MESSAGE_TERM(mp))) {
if (is_not_immed(ERL_MESSAGE_TOKEN(mp))) {
bp = (ErlHeapFragment *) mp->data.dist_ext->ext_endp;
erts_cleanup_offheap(&bp->off_heap);
}
if (mp->data.dist_ext)
erts_free_dist_ext_copy(mp->data.dist_ext);
}
else {
if (mp->data.attached != ERTS_MSG_COMBINED_HFRAG)
bp = mp->data.heap_frag;
else {
bp = mp->hfrag.next;
erts_cleanup_offheap(&mp->hfrag.off_heap);
}
if (bp)
free_message_buffer(bp);
}
fmp = mp;
mp = mp->next;
erts_free_message(fmp);
}
}
/**
*
* @brief Send one message from *NOT* a local process.
*
* seq_trace does not work with this type of messages
* to it is set to am_undefined which means that the
* receiving process will not remove the seq_trace token
* when it gets this message.
*
*/
void
erts_queue_message(Process* receiver, ErtsProcLocks receiver_locks,
ErtsMessage* mp, Eterm msg, Eterm from)
{
ASSERT(is_not_internal_pid(from));
ERL_MESSAGE_TERM(mp) = msg;
ERL_MESSAGE_FROM(mp) = from;
ERL_MESSAGE_TOKEN(mp) = am_undefined;
queue_messages(receiver, receiver_locks, mp, &mp->next, 1);
}
void
erts_move_msg_attached_data_to_heap(ErtsHeapFactory* factory,
ErlMessage *msg)
{
if (is_value(ERL_MESSAGE_TERM(msg)))
erts_move_msg_mbuf_to_heap(&factory->hp, factory->off_heap, msg);
else if (msg->data.dist_ext) {
ASSERT(msg->data.dist_ext->heap_size >= 0);
if (is_not_nil(ERL_MESSAGE_TOKEN(msg))) {
ErlHeapFragment *heap_frag;
heap_frag = erts_dist_ext_trailer(msg->data.dist_ext);
ERL_MESSAGE_TOKEN(msg) = copy_struct(ERL_MESSAGE_TOKEN(msg),
heap_frag->used_size,
&factory->hp,
factory->off_heap);
erts_cleanup_offheap(&heap_frag->off_heap);
}
ERL_MESSAGE_TERM(msg) = erts_decode_dist_ext(factory,
msg->data.dist_ext);
erts_free_dist_ext_copy(msg->data.dist_ext);
msg->data.dist_ext = NULL;
}
/* else: bad external detected when calculating size */
}
void verify_process(Process *p)
{
#define VERIFY_AREA(name,ptr,sz) { \
int n = (sz); \
while (n--) if(!verify_eterm(p,*(ptr+n))) \
erts_exit(ERTS_ERROR_EXIT,"Wild pointer found in " name " of %T!\n",p->common.id); }
#define VERIFY_ETERM(name,eterm) { \
if(!verify_eterm(p,eterm)) \
erts_exit(ERTS_ERROR_EXIT,"Wild pointer found in " name " of %T!\n",p->common.id); }
ErtsMessage* mp = p->msg.first;
VERBOSE(DEBUG_MEMORY,("Verify process: %T...\n",p->common.id));
while (mp != NULL) {
VERIFY_ETERM("message term",ERL_MESSAGE_TERM(mp));
VERIFY_ETERM("message token",ERL_MESSAGE_TOKEN(mp));
mp = mp->next;
}
erts_check_stack(p);
erts_check_heap(p);
if (p->dictionary)
VERIFY_AREA("dictionary", ERTS_PD_START(p->dictionary), ERTS_PD_SIZE(p->dictionary));
VERIFY_ETERM("seq trace token",p->seq_trace_token);
VERIFY_ETERM("group leader",p->group_leader);
VERIFY_ETERM("fvalue",p->fvalue);
VERIFY_ETERM("ftrace",p->ftrace);
VERBOSE(DEBUG_MEMORY,("...done\n"));
#undef VERIFY_AREA
#undef VERIFY_ETERM
}
/* Add messages last in message queue */
static Sint
queue_messages(Process* receiver,
erts_aint32_t *receiver_state,
ErtsProcLocks receiver_locks,
ErtsMessage* first,
ErtsMessage** last,
Uint len,
Eterm from)
{
ErtsTracingEvent* te;
Sint res;
int locked_msgq = 0;
erts_aint32_t state;
ASSERT(is_value(ERL_MESSAGE_TERM(first)));
ASSERT(ERL_MESSAGE_TOKEN(first) == am_undefined ||
ERL_MESSAGE_TOKEN(first) == NIL ||
is_tuple(ERL_MESSAGE_TOKEN(first)));
#ifdef ERTS_ENABLE_LOCK_CHECK
ERTS_LC_ASSERT(erts_proc_lc_my_proc_locks(receiver) < ERTS_PROC_LOCK_MSGQ ||
receiver_locks == erts_proc_lc_my_proc_locks(receiver));
#endif
if (!(receiver_locks & ERTS_PROC_LOCK_MSGQ)) {
if (erts_proc_trylock(receiver, ERTS_PROC_LOCK_MSGQ) == EBUSY) {
ErtsProcLocks need_locks;
if (receiver_state)
state = *receiver_state;
else
state = erts_atomic32_read_nob(&receiver->state);
if (state & (ERTS_PSFLG_EXITING|ERTS_PSFLG_PENDING_EXIT))
goto exiting;
need_locks = receiver_locks & ERTS_PROC_LOCKS_HIGHER_THAN(ERTS_PROC_LOCK_MSGQ);
if (need_locks) {
erts_proc_unlock(receiver, need_locks);
}
need_locks |= ERTS_PROC_LOCK_MSGQ;
erts_proc_lock(receiver, need_locks);
}
locked_msgq = 1;
}
state = erts_atomic32_read_nob(&receiver->state);
if (state & (ERTS_PSFLG_PENDING_EXIT|ERTS_PSFLG_EXITING)) {
exiting:
/* Drop message if receiver is exiting or has a pending exit... */
if (locked_msgq)
erts_proc_unlock(receiver, ERTS_PROC_LOCK_MSGQ);
erts_cleanup_messages(first);
return 0;
}
res = receiver->msg.len;
if (receiver_locks & ERTS_PROC_LOCK_MAIN) {
/*
* We move 'in queue' to 'private queue' and place
* message at the end of 'private queue' in order
* to ensure that the 'in queue' doesn't contain
* references into the heap. By ensuring this,
* we don't need to include the 'in queue' in
* the root set when garbage collecting.
*/
res += receiver->msg_inq.len;
ERTS_MSGQ_MV_INQ2PRIVQ(receiver);
LINK_MESSAGE_PRIVQ(receiver, first, last, len);
}
else
{
LINK_MESSAGE(receiver, first, last, len);
}
if (IS_TRACED_FL(receiver, F_TRACE_RECEIVE)
&& (te = &erts_receive_tracing[erts_active_bp_ix()],
te->on)) {
ErtsMessage *msg = first;
#ifdef USE_VM_PROBES
if (DTRACE_ENABLED(message_queued)) {
DTRACE_CHARBUF(receiver_name, DTRACE_TERM_BUF_SIZE);
Sint tok_label = 0;
Sint tok_lastcnt = 0;
Sint tok_serial = 0;
Eterm seq_trace_token = ERL_MESSAGE_TOKEN(msg);
dtrace_proc_str(receiver, receiver_name);
if (seq_trace_token != NIL && is_tuple(seq_trace_token)) {
tok_label = signed_val(SEQ_TRACE_T_LABEL(seq_trace_token));
tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(seq_trace_token));
tok_serial = signed_val(SEQ_TRACE_T_SERIAL(seq_trace_token));
}
DTRACE6(message_queued,
receiver_name, size_object(ERL_MESSAGE_TERM(msg)),
receiver->msg.len,
tok_label, tok_lastcnt, tok_serial);
}
#endif
while (msg) {
trace_receive(receiver, from, ERL_MESSAGE_TERM(msg), te);
msg = msg->next;
}
}
if (locked_msgq) {
erts_proc_unlock(receiver, ERTS_PROC_LOCK_MSGQ);
}
erts_proc_notify_new_message(receiver, receiver_locks);
return res;
}
void
erts_queue_dist_message(Process *rcvr,
ErtsProcLocks rcvr_locks,
ErtsDistExternal *dist_ext,
Eterm token,
Eterm from)
{
ErtsMessage* mp;
#ifdef USE_VM_PROBES
Sint tok_label = 0;
Sint tok_lastcnt = 0;
Sint tok_serial = 0;
#endif
erts_aint_t state;
ERTS_LC_ASSERT(rcvr_locks == erts_proc_lc_my_proc_locks(rcvr));
mp = erts_alloc_message(0, NULL);
mp->data.dist_ext = dist_ext;
ERL_MESSAGE_TERM(mp) = THE_NON_VALUE;
#ifdef USE_VM_PROBES
ERL_MESSAGE_DT_UTAG(mp) = NIL;
if (token == am_have_dt_utag)
ERL_MESSAGE_TOKEN(mp) = NIL;
else
#endif
ERL_MESSAGE_TOKEN(mp) = token;
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ)) {
if (erts_proc_trylock(rcvr, ERTS_PROC_LOCK_MSGQ) == EBUSY) {
ErtsProcLocks need_locks = ERTS_PROC_LOCK_MSGQ;
ErtsProcLocks unlocks =
rcvr_locks & ERTS_PROC_LOCKS_HIGHER_THAN(ERTS_PROC_LOCK_MSGQ);
if (unlocks) {
erts_proc_unlock(rcvr, unlocks);
need_locks |= unlocks;
}
erts_proc_lock(rcvr, need_locks);
}
}
state = erts_atomic32_read_acqb(&rcvr->state);
if (state & (ERTS_PSFLG_PENDING_EXIT|ERTS_PSFLG_EXITING)) {
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ))
erts_proc_unlock(rcvr, ERTS_PROC_LOCK_MSGQ);
/* Drop message if receiver is exiting or has a pending exit ... */
erts_cleanup_messages(mp);
}
else
if (IS_TRACED_FL(rcvr, F_TRACE_RECEIVE)) {
if (from == am_Empty)
from = dist_ext->dep->sysname;
/* Ahh... need to decode it in order to trace it... */
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ))
erts_proc_unlock(rcvr, ERTS_PROC_LOCK_MSGQ);
if (!erts_decode_dist_message(rcvr, rcvr_locks, mp, 0))
erts_free_message(mp);
else {
Eterm msg = ERL_MESSAGE_TERM(mp);
token = ERL_MESSAGE_TOKEN(mp);
#ifdef USE_VM_PROBES
if (DTRACE_ENABLED(message_queued)) {
DTRACE_CHARBUF(receiver_name, DTRACE_TERM_BUF_SIZE);
dtrace_proc_str(rcvr, receiver_name);
if (have_seqtrace(token)) {
tok_label = signed_val(SEQ_TRACE_T_LABEL(token));
tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(token));
tok_serial = signed_val(SEQ_TRACE_T_SERIAL(token));
}
DTRACE6(message_queued,
receiver_name, size_object(msg), rcvr->msg.len,
tok_label, tok_lastcnt, tok_serial);
}
#endif
erts_queue_message(rcvr, rcvr_locks, mp, msg, from);
}
}
else {
/* Enqueue message on external format */
#ifdef USE_VM_PROBES
if (DTRACE_ENABLED(message_queued)) {
DTRACE_CHARBUF(receiver_name, DTRACE_TERM_BUF_SIZE);
dtrace_proc_str(rcvr, receiver_name);
if (have_seqtrace(token)) {
tok_label = signed_val(SEQ_TRACE_T_LABEL(token));
tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(token));
tok_serial = signed_val(SEQ_TRACE_T_SERIAL(token));
}
/*
* TODO: We don't know the real size of the external message here.
* -1 will appear to a D script as 4294967295.
*/
DTRACE6(message_queued, receiver_name, -1, rcvr->msg.len + 1,
tok_label, tok_lastcnt, tok_serial);
}
#endif
LINK_MESSAGE(rcvr, mp, &mp->next, 1);
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ))
erts_proc_unlock(rcvr, ERTS_PROC_LOCK_MSGQ);
erts_proc_notify_new_message(rcvr,
rcvr_locks
);
}
}
/*
* Moves content of message buffer attached to a message into a heap.
* The message buffer is deallocated.
*/
void
erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
{
/* Unions for typecasts avoids warnings about type-punned pointers and aliasing */
union {
Uint** upp;
ProcBin **pbpp;
ErlFunThing **efpp;
ExternalThing **etpp;
} oh_list_pp, oh_el_next_pp;
union {
Uint *up;
ProcBin *pbp;
ErlFunThing *efp;
ExternalThing *etp;
} oh_el_p;
Eterm term, token, *fhp, *hp;
Sint offs;
Uint sz;
ErlHeapFragment *bp;
#ifdef HARD_DEBUG
ProcBin *dbg_mso_start = off_heap->mso;
ErlFunThing *dbg_fun_start = off_heap->funs;
ExternalThing *dbg_external_start = off_heap->externals;
Eterm dbg_term, dbg_token;
ErlHeapFragment *dbg_bp;
Uint *dbg_hp, *dbg_thp_start;
Uint dbg_term_sz, dbg_token_sz;
#endif
bp = msg->data.heap_frag;
term = ERL_MESSAGE_TERM(msg);
token = ERL_MESSAGE_TOKEN(msg);
if (!bp) {
ASSERT(is_immed(term) && is_immed(token));
return;
}
#ifdef HARD_DEBUG
dbg_term_sz = size_object(term);
dbg_token_sz = size_object(token);
ASSERT(bp->size == dbg_term_sz + dbg_token_sz);
dbg_bp = new_message_buffer(bp->size);
dbg_hp = dbg_bp->mem;
dbg_term = copy_struct(term, dbg_term_sz, &dbg_hp, &dbg_bp->off_heap);
dbg_token = copy_struct(token, dbg_token_sz, &dbg_hp, &dbg_bp->off_heap);
dbg_thp_start = *hpp;
#endif
ASSERT(bp);
msg->data.attached = NULL;
off_heap->overhead += bp->off_heap.overhead;
sz = bp->size;
#ifdef DEBUG
if (is_not_immed(term)) {
ASSERT(bp->mem <= ptr_val(term));
ASSERT(bp->mem + bp->size > ptr_val(term));
}
if (is_not_immed(token)) {
ASSERT(bp->mem <= ptr_val(token));
ASSERT(bp->mem + bp->size > ptr_val(token));
}
#endif
fhp = bp->mem;
hp = *hpp;
offs = hp - fhp;
oh_list_pp.upp = NULL;
oh_el_next_pp.upp = NULL; /* Shut up compiler warning */
oh_el_p.up = NULL; /* Shut up compiler warning */
while (sz--) {
Uint cpy_sz;
Eterm val = *fhp++;
switch (primary_tag(val)) {
case TAG_PRIMARY_IMMED1:
*hp++ = val;
break;
case TAG_PRIMARY_LIST:
case TAG_PRIMARY_BOXED:
ASSERT(bp->mem <= ptr_val(val));
ASSERT(bp->mem + bp->size > ptr_val(val));
*hp++ = offset_ptr(val, offs);
break;
case TAG_PRIMARY_HEADER:
*hp++ = val;
switch (val & _HEADER_SUBTAG_MASK) {
case ARITYVAL_SUBTAG:
break;
case REFC_BINARY_SUBTAG:
oh_list_pp.pbpp = &off_heap->mso;
oh_el_p.up = (hp-1);
oh_el_next_pp.pbpp = &(oh_el_p.pbp)->next;
cpy_sz = thing_arityval(val);
goto cpy_words;
case FUN_SUBTAG:
#ifndef HYBRID
oh_list_pp.efpp = &off_heap->funs;
oh_el_p.up = (hp-1);
oh_el_next_pp.efpp = &(oh_el_p.efp)->next;
#endif
cpy_sz = thing_arityval(val);
goto cpy_words;
case EXTERNAL_PID_SUBTAG:
case EXTERNAL_PORT_SUBTAG:
case EXTERNAL_REF_SUBTAG:
oh_list_pp.etpp = &off_heap->externals;
oh_el_p.up = (hp-1);
oh_el_next_pp.etpp = &(oh_el_p.etp)->next;
cpy_sz = thing_arityval(val);
goto cpy_words;
default:
cpy_sz = header_arity(val);
cpy_words:
sz -= cpy_sz;
while (cpy_sz >= 8) {
cpy_sz -= 8;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
}
switch (cpy_sz) {
case 7: *hp++ = *fhp++;
case 6: *hp++ = *fhp++;
case 5: *hp++ = *fhp++;
case 4: *hp++ = *fhp++;
case 3: *hp++ = *fhp++;
case 2: *hp++ = *fhp++;
case 1: *hp++ = *fhp++;
default: break;
}
if (oh_list_pp.upp) {
#ifdef HARD_DEBUG
Uint *dbg_old_oh_list_p = *oh_list_pp.upp;
#endif
/* Add to offheap list */
*oh_el_next_pp.upp = *oh_list_pp.upp;
*oh_list_pp.upp = oh_el_p.up;
ASSERT(*hpp <= oh_el_p.up);
ASSERT(hp > oh_el_p.up);
#ifdef HARD_DEBUG
switch (val & _HEADER_SUBTAG_MASK) {
case REFC_BINARY_SUBTAG:
ASSERT(off_heap->mso == *oh_list_pp.pbpp);
ASSERT(off_heap->mso->next
== (ProcBin *) dbg_old_oh_list_p);
break;
#ifndef HYBRID
case FUN_SUBTAG:
ASSERT(off_heap->funs == *oh_list_pp.efpp);
ASSERT(off_heap->funs->next
== (ErlFunThing *) dbg_old_oh_list_p);
break;
#endif
case EXTERNAL_PID_SUBTAG:
case EXTERNAL_PORT_SUBTAG:
case EXTERNAL_REF_SUBTAG:
ASSERT(off_heap->externals
== *oh_list_pp.etpp);
ASSERT(off_heap->externals->next
== (ExternalThing *) dbg_old_oh_list_p);
break;
default:
ASSERT(0);
}
#endif
oh_list_pp.upp = NULL;
}
break;
}
break;
}
}
ASSERT(bp->size == hp - *hpp);
*hpp = hp;
if (is_not_immed(token)) {
ASSERT(bp->mem <= ptr_val(token));
ASSERT(bp->mem + bp->size > ptr_val(token));
ERL_MESSAGE_TOKEN(msg) = offset_ptr(token, offs);
#ifdef HARD_DEBUG
ASSERT(dbg_thp_start <= ptr_val(ERL_MESSAGE_TOKEN(msg)));
ASSERT(hp > ptr_val(ERL_MESSAGE_TOKEN(msg)));
#endif
}
if (is_not_immed(term)) {
ASSERT(bp->mem <= ptr_val(term));
ASSERT(bp->mem + bp->size > ptr_val(term));
ERL_MESSAGE_TERM(msg) = offset_ptr(term, offs);
#ifdef HARD_DEBUG
ASSERT(dbg_thp_start <= ptr_val(ERL_MESSAGE_TERM(msg)));
ASSERT(hp > ptr_val(ERL_MESSAGE_TERM(msg)));
#endif
}
#ifdef HARD_DEBUG
{
int i, j;
{
ProcBin *mso = off_heap->mso;
i = j = 0;
while (mso != dbg_mso_start) {
mso = mso->next;
i++;
}
mso = bp->off_heap.mso;
while (mso) {
mso = mso->next;
j++;
}
ASSERT(i == j);
}
{
ErlFunThing *fun = off_heap->funs;
i = j = 0;
while (fun != dbg_fun_start) {
fun = fun->next;
i++;
}
fun = bp->off_heap.funs;
while (fun) {
fun = fun->next;
j++;
}
ASSERT(i == j);
}
{
ExternalThing *external = off_heap->externals;
i = j = 0;
while (external != dbg_external_start) {
external = external->next;
i++;
}
external = bp->off_heap.externals;
while (external) {
external = external->next;
j++;
}
ASSERT(i == j);
}
}
#endif
bp->off_heap.mso = NULL;
#ifndef HYBRID
bp->off_heap.funs = NULL;
#endif
bp->off_heap.externals = NULL;
free_message_buffer(bp);
#ifdef HARD_DEBUG
ASSERT(eq(ERL_MESSAGE_TERM(msg), dbg_term));
ASSERT(eq(ERL_MESSAGE_TOKEN(msg), dbg_token));
free_message_buffer(dbg_bp);
#endif
}
int
erts_decode_dist_message(Process *proc, ErtsProcLocks proc_locks,
ErtsMessage *msgp, int force_off_heap)
{
ErtsHeapFactory factory;
Eterm msg;
ErlHeapFragment *bp;
Sint need;
int decode_in_heap_frag;
decode_in_heap_frag = (force_off_heap
|| !(proc_locks & ERTS_PROC_LOCK_MAIN)
|| (proc->flags & F_OFF_HEAP_MSGQ));
if (msgp->data.dist_ext->heap_size >= 0)
need = msgp->data.dist_ext->heap_size;
else {
need = erts_decode_dist_ext_size(msgp->data.dist_ext);
if (need < 0) {
/* bad msg; remove it... */
if (is_not_immed(ERL_MESSAGE_TOKEN(msgp))) {
bp = erts_dist_ext_trailer(msgp->data.dist_ext);
erts_cleanup_offheap(&bp->off_heap);
}
erts_free_dist_ext_copy(msgp->data.dist_ext);
msgp->data.dist_ext = NULL;
return 0;
}
msgp->data.dist_ext->heap_size = need;
}
if (is_not_immed(ERL_MESSAGE_TOKEN(msgp))) {
bp = erts_dist_ext_trailer(msgp->data.dist_ext);
need += bp->used_size;
}
if (decode_in_heap_frag)
erts_factory_heap_frag_init(&factory, new_message_buffer(need));
else
erts_factory_proc_prealloc_init(&factory, proc, need);
ASSERT(msgp->data.dist_ext->heap_size >= 0);
if (is_not_immed(ERL_MESSAGE_TOKEN(msgp))) {
ErlHeapFragment *heap_frag;
heap_frag = erts_dist_ext_trailer(msgp->data.dist_ext);
ERL_MESSAGE_TOKEN(msgp) = copy_struct(ERL_MESSAGE_TOKEN(msgp),
heap_frag->used_size,
&factory.hp,
factory.off_heap);
erts_cleanup_offheap(&heap_frag->off_heap);
}
msg = erts_decode_dist_ext(&factory, msgp->data.dist_ext);
ERL_MESSAGE_TERM(msgp) = msg;
erts_free_dist_ext_copy(msgp->data.dist_ext);
msgp->data.attached = NULL;
if (is_non_value(msg)) {
erts_factory_undo(&factory);
return 0;
}
erts_factory_trim_and_close(&factory, msgp->m,
ERL_MESSAGE_REF_ARRAY_SZ);
ASSERT(!msgp->data.heap_frag);
if (decode_in_heap_frag)
msgp->data.heap_frag = factory.heap_frags;
return 1;
}
void
erts_send_message(Process* sender,
Process* receiver,
ErtsProcLocks *receiver_locks,
Eterm message,
unsigned flags)
{
Uint msize;
ErlHeapFragment* bp = NULL;
Eterm token = NIL;
BM_STOP_TIMER(system);
BM_MESSAGE(message,sender,receiver);
BM_START_TIMER(send);
if (SEQ_TRACE_TOKEN(sender) != NIL && !(flags & ERTS_SND_FLG_NO_SEQ_TRACE)) {
Eterm* hp;
BM_SWAP_TIMER(send,size);
msize = size_object(message);
BM_SWAP_TIMER(size,send);
seq_trace_update_send(sender);
seq_trace_output(SEQ_TRACE_TOKEN(sender), message, SEQ_TRACE_SEND,
receiver->id, sender);
bp = new_message_buffer(msize + 6 /* TUPLE5 */);
hp = bp->mem;
BM_SWAP_TIMER(send,copy);
token = copy_struct(SEQ_TRACE_TOKEN(sender),
6 /* TUPLE5 */,
&hp,
&bp->off_heap);
message = copy_struct(message, msize, &hp, &bp->off_heap);
BM_MESSAGE_COPIED(msize);
BM_SWAP_TIMER(copy,send);
erts_queue_message(receiver,
receiver_locks,
bp,
message,
token);
BM_SWAP_TIMER(send,system);
#ifdef HYBRID
} else {
ErlMessage* mp = message_alloc();
BM_SWAP_TIMER(send,copy);
#ifdef INCREMENTAL
/* TODO: During GC activate processes if the message relies in
* the fromspace and the sender is active. During major
* collections add the message to the gray stack if it relies
* in the old generation and the sender is active and the
* receiver is inactive.
if (!IS_CONST(message) && (ma_gc_flags & GC_CYCLE) &&
(ptr_val(message) >= inc_fromspc &&
ptr_val(message) < inc_fromend) && INC_IS_ACTIVE(sender))
INC_ACTIVATE(receiver);
else if (!IS_CONST(message) && (ma_gc_flags & GC_CYCLE) &&
(ptr_val(message) >= global_old_heap &&
ptr_val(message) < global_old_hend) &&
INC_IS_ACTIVE(sender) && !INC_IS_ACTIVE(receiver))
Mark message in blackmap and add it to the gray stack
*/
if (!IS_CONST(message))
INC_ACTIVATE(receiver);
#endif
LAZY_COPY(sender,message);
BM_SWAP_TIMER(copy,send);
ERL_MESSAGE_TERM(mp) = message;
ERL_MESSAGE_TOKEN(mp) = NIL;
mp->next = NULL;
LINK_MESSAGE(receiver, mp);
ACTIVATE(receiver);
if (receiver->status == P_WAITING) {
erts_add_to_runq(receiver);
} else if (receiver->status == P_SUSPENDED) {
receiver->rstatus = P_RUNABLE;
}
if (IS_TRACED_FL(receiver, F_TRACE_RECEIVE)) {
trace_receive(receiver, message);
}
BM_SWAP_TIMER(send,system);
return;
#else
} else if (sender == receiver) {
void
erts_queue_dist_message(Process *rcvr,
ErtsProcLocks rcvr_locks,
ErtsDistExternal *dist_ext,
ErlHeapFragment *hfrag,
Eterm token,
Eterm from)
{
ErtsMessage* mp;
erts_aint_t state;
ERTS_LC_ASSERT(rcvr_locks == erts_proc_lc_my_proc_locks(rcvr));
if (hfrag) {
/* Fragmented message, allocate a message reference */
mp = erts_alloc_message(0, NULL);
mp->data.heap_frag = hfrag;
} else {
/* Un-fragmented message, allocate space for
token and dist_ext in message. */
Uint dist_ext_sz = erts_dist_ext_size(dist_ext) / sizeof(Eterm);
Uint token_sz = size_object(token);
Uint sz = token_sz + dist_ext_sz;
Eterm *hp;
mp = erts_alloc_message(sz, &hp);
mp->data.heap_frag = &mp->hfrag;
mp->hfrag.used_size = token_sz;
erts_make_dist_ext_copy(dist_ext, erts_get_dist_ext(mp->data.heap_frag));
token = copy_struct(token, token_sz, &hp, &mp->data.heap_frag->off_heap);
}
ERL_MESSAGE_FROM(mp) = dist_ext->dep->sysname;
ERL_MESSAGE_TERM(mp) = THE_NON_VALUE;
#ifdef USE_VM_PROBES
ERL_MESSAGE_DT_UTAG(mp) = NIL;
if (token == am_have_dt_utag)
ERL_MESSAGE_TOKEN(mp) = NIL;
else
#endif
ERL_MESSAGE_TOKEN(mp) = token;
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ)) {
if (erts_proc_trylock(rcvr, ERTS_PROC_LOCK_MSGQ) == EBUSY) {
ErtsProcLocks need_locks = ERTS_PROC_LOCK_MSGQ;
ErtsProcLocks unlocks =
rcvr_locks & ERTS_PROC_LOCKS_HIGHER_THAN(ERTS_PROC_LOCK_MSGQ);
if (unlocks) {
erts_proc_unlock(rcvr, unlocks);
need_locks |= unlocks;
}
erts_proc_lock(rcvr, need_locks);
}
}
state = erts_atomic32_read_acqb(&rcvr->state);
if (state & ERTS_PSFLG_EXITING) {
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ))
erts_proc_unlock(rcvr, ERTS_PROC_LOCK_MSGQ);
/* Drop message if receiver is exiting or has a pending exit ... */
erts_cleanup_messages(mp);
}
else {
LINK_MESSAGE(rcvr, mp);
if (rcvr_locks & ERTS_PROC_LOCK_MAIN)
erts_proc_sig_fetch(rcvr);
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ))
erts_proc_unlock(rcvr, ERTS_PROC_LOCK_MSGQ);
erts_proc_notify_new_message(rcvr, rcvr_locks);
}
}
Sint
erts_move_messages_off_heap(Process *c_p)
{
int reds = 1;
/*
* Move all messages off heap. This *only* occurs when the
* process had off heap message disabled and just enabled
* it...
*/
ErtsMessage *mp;
reds += c_p->msg.len / 10;
ASSERT(erts_atomic32_read_nob(&c_p->state)
& ERTS_PSFLG_OFF_HEAP_MSGQ);
ASSERT(c_p->flags & F_OFF_HEAP_MSGQ_CHNG);
for (mp = c_p->msg.first; mp; mp = mp->next) {
Uint msg_sz, token_sz;
#ifdef USE_VM_PROBES
Uint utag_sz;
#endif
Eterm *hp;
ErlHeapFragment *hfrag;
if (mp->data.attached)
continue;
if (is_immed(ERL_MESSAGE_TERM(mp))
#ifdef USE_VM_PROBES
&& is_immed(ERL_MESSAGE_DT_UTAG(mp))
#endif
&& is_not_immed(ERL_MESSAGE_TOKEN(mp)))
continue;
/*
* The message refers into the heap. Copy the message
* from the heap into a heap fragment and attach
* it to the message...
*/
msg_sz = size_object(ERL_MESSAGE_TERM(mp));
#ifdef USE_VM_PROBES
utag_sz = size_object(ERL_MESSAGE_DT_UTAG(mp));
#endif
token_sz = size_object(ERL_MESSAGE_TOKEN(mp));
hfrag = new_message_buffer(msg_sz
#ifdef USE_VM_PROBES
+ utag_sz
#endif
+ token_sz);
hp = hfrag->mem;
if (is_not_immed(ERL_MESSAGE_TERM(mp)))
ERL_MESSAGE_TERM(mp) = copy_struct(ERL_MESSAGE_TERM(mp),
msg_sz, &hp,
&hfrag->off_heap);
if (is_not_immed(ERL_MESSAGE_TOKEN(mp)))
ERL_MESSAGE_TOKEN(mp) = copy_struct(ERL_MESSAGE_TOKEN(mp),
token_sz, &hp,
&hfrag->off_heap);
#ifdef USE_VM_PROBES
if (is_not_immed(ERL_MESSAGE_DT_UTAG(mp)))
ERL_MESSAGE_DT_UTAG(mp) = copy_struct(ERL_MESSAGE_DT_UTAG(mp),
utag_sz, &hp,
&hfrag->off_heap);
#endif
mp->data.heap_frag = hfrag;
reds += 1;
}
return reds;
}
/* Add a message last in message queue */
static Sint
queue_message(Process *c_p,
Process* receiver,
erts_aint32_t *receiver_state,
ErtsProcLocks *receiver_locks,
ErtsMessage* mp,
Eterm message,
Eterm seq_trace_token
#ifdef USE_VM_PROBES
, Eterm dt_utag
#endif
)
{
Sint res;
int locked_msgq = 0;
erts_aint32_t state;
ERTS_SMP_LC_ASSERT(*receiver_locks == erts_proc_lc_my_proc_locks(receiver));
#ifdef ERTS_SMP
if (!(*receiver_locks & ERTS_PROC_LOCK_MSGQ)) {
if (erts_smp_proc_trylock(receiver, ERTS_PROC_LOCK_MSGQ) == EBUSY) {
ErtsProcLocks need_locks = ERTS_PROC_LOCK_MSGQ;
if (receiver_state)
state = *receiver_state;
else
state = erts_smp_atomic32_read_nob(&receiver->state);
if (state & (ERTS_PSFLG_EXITING|ERTS_PSFLG_PENDING_EXIT))
goto exiting;
if (*receiver_locks & ERTS_PROC_LOCK_STATUS) {
erts_smp_proc_unlock(receiver, ERTS_PROC_LOCK_STATUS);
need_locks |= ERTS_PROC_LOCK_STATUS;
}
erts_smp_proc_lock(receiver, need_locks);
}
locked_msgq = 1;
}
#endif
state = erts_smp_atomic32_read_nob(&receiver->state);
if (state & (ERTS_PSFLG_PENDING_EXIT|ERTS_PSFLG_EXITING)) {
#ifdef ERTS_SMP
exiting:
#endif
/* Drop message if receiver is exiting or has a pending exit... */
if (locked_msgq)
erts_smp_proc_unlock(receiver, ERTS_PROC_LOCK_MSGQ);
erts_cleanup_messages(mp);
return 0;
}
ERL_MESSAGE_TERM(mp) = message;
ERL_MESSAGE_TOKEN(mp) = seq_trace_token;
#ifdef USE_VM_PROBES
ERL_MESSAGE_DT_UTAG(mp) = dt_utag;
#endif
res = receiver->msg.len;
#ifdef ERTS_SMP
if (*receiver_locks & ERTS_PROC_LOCK_MAIN) {
/*
* We move 'in queue' to 'private queue' and place
* message at the end of 'private queue' in order
* to ensure that the 'in queue' doesn't contain
* references into the heap. By ensuring this,
* we don't need to include the 'in queue' in
* the root set when garbage collecting.
*/
res += receiver->msg_inq.len;
ERTS_SMP_MSGQ_MV_INQ2PRIVQ(receiver);
LINK_MESSAGE_PRIVQ(receiver, mp);
}
else
#endif
{
LINK_MESSAGE(receiver, mp);
}
#ifdef USE_VM_PROBES
if (DTRACE_ENABLED(message_queued)) {
DTRACE_CHARBUF(receiver_name, DTRACE_TERM_BUF_SIZE);
Sint tok_label = 0;
Sint tok_lastcnt = 0;
Sint tok_serial = 0;
dtrace_proc_str(receiver, receiver_name);
if (seq_trace_token != NIL && is_tuple(seq_trace_token)) {
tok_label = signed_val(SEQ_TRACE_T_LABEL(seq_trace_token));
tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(seq_trace_token));
tok_serial = signed_val(SEQ_TRACE_T_SERIAL(seq_trace_token));
}
DTRACE6(message_queued,
receiver_name, size_object(message), receiver->msg.len,
tok_label, tok_lastcnt, tok_serial);
}
#endif
if (IS_TRACED_FL(receiver, F_TRACE_RECEIVE))
trace_receive(receiver, message);
if (locked_msgq)
erts_smp_proc_unlock(receiver, ERTS_PROC_LOCK_MSGQ);
erts_proc_notify_new_message(receiver,
#ifdef ERTS_SMP
*receiver_locks
#else
0
#endif
);
#ifndef ERTS_SMP
ERTS_HOLE_CHECK(receiver);
#endif
return res;
}
/* Add a message last in message queue */
void
erts_queue_message(Process* receiver,
ErtsProcLocks *receiver_locks,
ErlHeapFragment* bp,
Eterm message,
Eterm seq_trace_token)
{
ErlMessage* mp;
#ifdef ERTS_SMP
ErtsProcLocks need_locks;
#else
ASSERT(bp != NULL || receiver->mbuf == NULL);
#endif
ERTS_SMP_LC_ASSERT(*receiver_locks == erts_proc_lc_my_proc_locks(receiver));
mp = message_alloc();
#ifdef ERTS_SMP
need_locks = ~(*receiver_locks) & (ERTS_PROC_LOCK_MSGQ
| ERTS_PROC_LOCK_STATUS);
if (need_locks) {
*receiver_locks |= need_locks;
if (erts_smp_proc_trylock(receiver, need_locks) == EBUSY) {
if (need_locks == ERTS_PROC_LOCK_MSGQ) {
erts_smp_proc_unlock(receiver, ERTS_PROC_LOCK_STATUS);
need_locks = (ERTS_PROC_LOCK_MSGQ
| ERTS_PROC_LOCK_STATUS);
}
erts_smp_proc_lock(receiver, need_locks);
}
}
if (receiver->is_exiting || ERTS_PROC_PENDING_EXIT(receiver)) {
/* Drop message if receiver is exiting or has a pending
* exit ...
*/
if (bp)
free_message_buffer(bp);
message_free(mp);
return;
}
#endif
ERL_MESSAGE_TERM(mp) = message;
ERL_MESSAGE_TOKEN(mp) = seq_trace_token;
mp->next = NULL;
#ifdef ERTS_SMP
if (*receiver_locks & ERTS_PROC_LOCK_MAIN) {
mp->data.heap_frag = bp;
/*
* We move 'in queue' to 'private queue' and place
* message at the end of 'private queue' in order
* to ensure that the 'in queue' doesn't contain
* references into the heap. By ensuring this,
* we don't need to include the 'in queue' in
* the root set when garbage collecting.
*/
ERTS_SMP_MSGQ_MV_INQ2PRIVQ(receiver);
LINK_MESSAGE_PRIVQ(receiver, mp);
}
else {
mp->data.heap_frag = bp;
LINK_MESSAGE(receiver, mp);
}
#else
mp->data.heap_frag = bp;
LINK_MESSAGE(receiver, mp);
#endif
notify_new_message(receiver);
if (IS_TRACED_FL(receiver, F_TRACE_RECEIVE)) {
trace_receive(receiver, message);
}
#ifndef ERTS_SMP
ERTS_HOLE_CHECK(receiver);
#endif
}
static void print_process_memory(Process *p)
{
ErlHeapFragment* bp = MBUF(p);
erts_printf("==============================\n");
erts_printf("|| Memory info for %T ||\n",p->common.id);
erts_printf("==============================\n");
erts_printf("-- %-*s ---%s-%s-%s-%s--\n",
PTR_SIZE, "PCB", dashes, dashes, dashes, dashes);
if (p->msg.first != NULL) {
ErtsMessage* mp;
erts_printf(" Message Queue:\n");
mp = p->msg.first;
while (mp != NULL) {
erts_printf("| 0x%0*lx | 0x%0*lx |\n",PTR_SIZE,
ERL_MESSAGE_TERM(mp),PTR_SIZE,ERL_MESSAGE_TOKEN(mp));
mp = mp->next;
}
}
if (p->dictionary != NULL) {
int n = ERTS_PD_SIZE(p->dictionary);
Eterm *ptr = ERTS_PD_START(p->dictionary);
erts_printf(" Dictionary: ");
while (n--) erts_printf("0x%0*lx ",PTR_SIZE,(unsigned long)ptr++);
erts_printf("\n");
}
if (p->arity > 0) {
int n = p->arity;
Eterm *ptr = p->arg_reg;
erts_printf(" Argument Registers: ");
while (n--) erts_printf("0x%0*lx ",PTR_SIZE,(unsigned long)*ptr++);
erts_printf("\n");
}
erts_printf(" Trace Token: 0x%0*lx\n",PTR_SIZE,p->seq_trace_token);
erts_printf(" Group Leader: 0x%0*lx\n",PTR_SIZE,p->group_leader);
erts_printf(" Fvalue: 0x%0*lx\n",PTR_SIZE,p->fvalue);
erts_printf(" Ftrace: 0x%0*lx\n",PTR_SIZE,p->ftrace);
erts_printf("+- %-*s -+ 0x%0*lx 0x%0*lx %s-%s-+\n",
PTR_SIZE, "Stack",
PTR_SIZE, (unsigned long)STACK_TOP(p),
PTR_SIZE, (unsigned long)STACK_START(p),
dashes, dashes);
print_untagged_memory(STACK_TOP(p),STACK_START(p));
erts_printf("+- %-*s -+ 0x%0*lx 0x%0*lx 0x%0*lx 0x%0*lx +\n",
PTR_SIZE, "Heap",
PTR_SIZE, (unsigned long)HEAP_START(p),
PTR_SIZE, (unsigned long)HIGH_WATER(p),
PTR_SIZE, (unsigned long)HEAP_TOP(p),
PTR_SIZE, (unsigned long)HEAP_END(p));
print_untagged_memory(HEAP_START(p),HEAP_TOP(p));
if (OLD_HEAP(p)) {
erts_printf("+- %-*s -+ 0x%0*lx 0x%0*lx 0x%0*lx %s-+\n",
PTR_SIZE, "Old Heap",
PTR_SIZE, (unsigned long)OLD_HEAP(p),
PTR_SIZE, (unsigned long)OLD_HTOP(p),
PTR_SIZE, (unsigned long)OLD_HEND(p),
dashes);
print_untagged_memory(OLD_HEAP(p),OLD_HTOP(p));
}
if (bp)
erts_printf("+- %-*s -+-%s-%s-%s-%s-+\n",
PTR_SIZE, "heap fragments",
dashes, dashes, dashes, dashes);
while (bp) {
print_untagged_memory(bp->mem,bp->mem + bp->used_size);
bp = bp->next;
}
}
/*
* Moves content of message buffer attached to a message into a heap.
* The message buffer is deallocated.
*/
void
erts_move_msg_mbuf_to_heap(Eterm** hpp, ErlOffHeap* off_heap, ErlMessage *msg)
{
struct erl_off_heap_header* oh;
Eterm term, token, *fhp, *hp;
Sint offs;
Uint sz;
ErlHeapFragment *bp;
#ifdef USE_VM_PROBES
Eterm utag;
#endif
#ifdef HARD_DEBUG
struct erl_off_heap_header* dbg_oh_start = off_heap->first;
Eterm dbg_term, dbg_token;
ErlHeapFragment *dbg_bp;
Uint *dbg_hp, *dbg_thp_start;
Uint dbg_term_sz, dbg_token_sz;
#ifdef USE_VM_PROBES
Eterm dbg_utag;
Uint dbg_utag_sz;
#endif
#endif
bp = msg->data.heap_frag;
term = ERL_MESSAGE_TERM(msg);
token = ERL_MESSAGE_TOKEN(msg);
#ifdef USE_VM_PROBES
utag = ERL_MESSAGE_DT_UTAG(msg);
#endif
if (!bp) {
#ifdef USE_VM_PROBES
ASSERT(is_immed(term) && is_immed(token) && is_immed(utag));
#else
ASSERT(is_immed(term) && is_immed(token));
#endif
return;
}
#ifdef HARD_DEBUG
dbg_term_sz = size_object(term);
dbg_token_sz = size_object(token);
dbg_bp = new_message_buffer(dbg_term_sz + dbg_token_sz);
#ifdef USE_VM_PROBES
dbg_utag_sz = size_object(utag);
dbg_bp = new_message_buffer(dbg_term_sz + dbg_token_sz + dbg_utag_sz );
#endif
/*ASSERT(dbg_term_sz + dbg_token_sz == erts_msg_used_frag_sz(msg));
Copied size may be smaller due to removed SubBins's or garbage.
Copied size may be larger due to duplicated shared terms.
*/
dbg_hp = dbg_bp->mem;
dbg_term = copy_struct(term, dbg_term_sz, &dbg_hp, &dbg_bp->off_heap);
dbg_token = copy_struct(token, dbg_token_sz, &dbg_hp, &dbg_bp->off_heap);
#ifdef USE_VM_PROBES
dbg_utag = copy_struct(utag, dbg_utag_sz, &dbg_hp, &dbg_bp->off_heap);
#endif
dbg_thp_start = *hpp;
#endif
if (bp->next != NULL) {
move_multi_frags(hpp, off_heap, bp, msg->m,
#ifdef USE_VM_PROBES
3
#else
2
#endif
);
goto copy_done;
}
OH_OVERHEAD(off_heap, bp->off_heap.overhead);
sz = bp->used_size;
ASSERT(is_immed(term) || in_heapfrag(ptr_val(term),bp));
ASSERT(is_immed(token) || in_heapfrag(ptr_val(token),bp));
fhp = bp->mem;
hp = *hpp;
offs = hp - fhp;
oh = NULL;
while (sz--) {
Uint cpy_sz;
Eterm val = *fhp++;
switch (primary_tag(val)) {
case TAG_PRIMARY_IMMED1:
*hp++ = val;
break;
case TAG_PRIMARY_LIST:
case TAG_PRIMARY_BOXED:
ASSERT(in_heapfrag(ptr_val(val), bp));
*hp++ = offset_ptr(val, offs);
break;
case TAG_PRIMARY_HEADER:
*hp++ = val;
switch (val & _HEADER_SUBTAG_MASK) {
case ARITYVAL_SUBTAG:
break;
case REFC_BINARY_SUBTAG:
case FUN_SUBTAG:
case EXTERNAL_PID_SUBTAG:
case EXTERNAL_PORT_SUBTAG:
case EXTERNAL_REF_SUBTAG:
oh = (struct erl_off_heap_header*) (hp-1);
cpy_sz = thing_arityval(val);
goto cpy_words;
default:
cpy_sz = header_arity(val);
cpy_words:
ASSERT(sz >= cpy_sz);
sz -= cpy_sz;
while (cpy_sz >= 8) {
cpy_sz -= 8;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
*hp++ = *fhp++;
}
switch (cpy_sz) {
case 7: *hp++ = *fhp++;
case 6: *hp++ = *fhp++;
case 5: *hp++ = *fhp++;
case 4: *hp++ = *fhp++;
case 3: *hp++ = *fhp++;
case 2: *hp++ = *fhp++;
case 1: *hp++ = *fhp++;
default: break;
}
if (oh) {
/* Add to offheap list */
oh->next = off_heap->first;
off_heap->first = oh;
ASSERT(*hpp <= (Eterm*)oh);
ASSERT(hp > (Eterm*)oh);
oh = NULL;
}
break;
}
break;
}
}
ASSERT(bp->used_size == hp - *hpp);
*hpp = hp;
if (is_not_immed(token)) {
ASSERT(in_heapfrag(ptr_val(token), bp));
ERL_MESSAGE_TOKEN(msg) = offset_ptr(token, offs);
#ifdef HARD_DEBUG
ASSERT(dbg_thp_start <= ptr_val(ERL_MESSAGE_TOKEN(msg)));
ASSERT(hp > ptr_val(ERL_MESSAGE_TOKEN(msg)));
#endif
}
if (is_not_immed(term)) {
ASSERT(in_heapfrag(ptr_val(term),bp));
ERL_MESSAGE_TERM(msg) = offset_ptr(term, offs);
#ifdef HARD_DEBUG
ASSERT(dbg_thp_start <= ptr_val(ERL_MESSAGE_TERM(msg)));
ASSERT(hp > ptr_val(ERL_MESSAGE_TERM(msg)));
#endif
}
#ifdef USE_VM_PROBES
if (is_not_immed(utag)) {
ASSERT(in_heapfrag(ptr_val(utag), bp));
ERL_MESSAGE_DT_UTAG(msg) = offset_ptr(utag, offs);
#ifdef HARD_DEBUG
ASSERT(dbg_thp_start <= ptr_val(ERL_MESSAGE_DT_UTAG(msg)));
ASSERT(hp > ptr_val(ERL_MESSAGE_DT_UTAG(msg)));
#endif
}
#endif
copy_done:
#ifdef HARD_DEBUG
{
int i, j;
ErlHeapFragment* frag;
{
struct erl_off_heap_header* dbg_oh = off_heap->first;
i = j = 0;
while (dbg_oh != dbg_oh_start) {
dbg_oh = dbg_oh->next;
i++;
}
for (frag=bp; frag; frag=frag->next) {
dbg_oh = frag->off_heap.first;
while (dbg_oh) {
dbg_oh = dbg_oh->next;
j++;
}
}
ASSERT(i == j);
}
}
#endif
bp->off_heap.first = NULL;
free_message_buffer(bp);
msg->data.heap_frag = NULL;
#ifdef HARD_DEBUG
ASSERT(eq(ERL_MESSAGE_TERM(msg), dbg_term));
ASSERT(eq(ERL_MESSAGE_TOKEN(msg), dbg_token));
#ifdef USE_VM_PROBES
ASSERT(eq(ERL_MESSAGE_DT_UTAG(msg), dbg_utag));
#endif
free_message_buffer(dbg_bp);
#endif
}
void
erts_queue_dist_message(Process *rcvr,
ErtsProcLocks *rcvr_locks,
ErtsDistExternal *dist_ext,
Eterm token)
{
ErlMessage* mp;
#ifdef USE_VM_PROBES
Sint tok_label = 0;
Sint tok_lastcnt = 0;
Sint tok_serial = 0;
#endif
#ifdef ERTS_SMP
erts_aint_t state;
#endif
ERTS_SMP_LC_ASSERT(*rcvr_locks == erts_proc_lc_my_proc_locks(rcvr));
mp = message_alloc();
#ifdef ERTS_SMP
if (!(*rcvr_locks & ERTS_PROC_LOCK_MSGQ)) {
if (erts_smp_proc_trylock(rcvr, ERTS_PROC_LOCK_MSGQ) == EBUSY) {
ErtsProcLocks need_locks = ERTS_PROC_LOCK_MSGQ;
if (*rcvr_locks & ERTS_PROC_LOCK_STATUS) {
erts_smp_proc_unlock(rcvr, ERTS_PROC_LOCK_STATUS);
need_locks |= ERTS_PROC_LOCK_STATUS;
}
erts_smp_proc_lock(rcvr, need_locks);
}
}
state = erts_smp_atomic32_read_acqb(&rcvr->state);
if (state & (ERTS_PSFLG_PENDING_EXIT|ERTS_PSFLG_EXITING)) {
if (!(*rcvr_locks & ERTS_PROC_LOCK_MSGQ))
erts_smp_proc_unlock(rcvr, ERTS_PROC_LOCK_MSGQ);
/* Drop message if receiver is exiting or has a pending exit ... */
if (is_not_nil(token)) {
ErlHeapFragment *heap_frag;
heap_frag = erts_dist_ext_trailer(mp->data.dist_ext);
erts_cleanup_offheap(&heap_frag->off_heap);
}
erts_free_dist_ext_copy(dist_ext);
message_free(mp);
}
else
#endif
if (IS_TRACED_FL(rcvr, F_TRACE_RECEIVE)) {
/* Ahh... need to decode it in order to trace it... */
ErlHeapFragment *mbuf;
Eterm msg;
if (!(*rcvr_locks & ERTS_PROC_LOCK_MSGQ))
erts_smp_proc_unlock(rcvr, ERTS_PROC_LOCK_MSGQ);
message_free(mp);
msg = erts_msg_distext2heap(rcvr, rcvr_locks, &mbuf, &token, dist_ext);
if (is_value(msg))
#ifdef USE_VM_PROBES
if (DTRACE_ENABLED(message_queued)) {
DTRACE_CHARBUF(receiver_name, DTRACE_TERM_BUF_SIZE);
dtrace_proc_str(rcvr, receiver_name);
if (token != NIL && token != am_have_dt_utag) {
tok_label = signed_val(SEQ_TRACE_T_LABEL(token));
tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(token));
tok_serial = signed_val(SEQ_TRACE_T_SERIAL(token));
}
DTRACE6(message_queued,
receiver_name, size_object(msg), rcvr->msg.len,
tok_label, tok_lastcnt, tok_serial);
}
#endif
erts_queue_message(rcvr, rcvr_locks, mbuf, msg, token);
}
else {
/* Enqueue message on external format */
ERL_MESSAGE_TERM(mp) = THE_NON_VALUE;
#ifdef USE_VM_PROBES
ERL_MESSAGE_DT_UTAG(mp) = NIL;
if (token == am_have_dt_utag) {
ERL_MESSAGE_TOKEN(mp) = NIL;
} else {
#endif
ERL_MESSAGE_TOKEN(mp) = token;
#ifdef USE_VM_PROBES
}
#endif
mp->next = NULL;
#ifdef USE_VM_PROBES
if (DTRACE_ENABLED(message_queued)) {
DTRACE_CHARBUF(receiver_name, DTRACE_TERM_BUF_SIZE);
dtrace_proc_str(rcvr, receiver_name);
if (token != NIL && token != am_have_dt_utag) {
tok_label = signed_val(SEQ_TRACE_T_LABEL(token));
tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(token));
tok_serial = signed_val(SEQ_TRACE_T_SERIAL(token));
}
/*
* TODO: We don't know the real size of the external message here.
* -1 will appear to a D script as 4294967295.
*/
DTRACE6(message_queued, receiver_name, -1, rcvr->msg.len + 1,
tok_label, tok_lastcnt, tok_serial);
}
#endif
mp->data.dist_ext = dist_ext;
LINK_MESSAGE(rcvr, mp);
if (!(*rcvr_locks & ERTS_PROC_LOCK_MSGQ))
erts_smp_proc_unlock(rcvr, ERTS_PROC_LOCK_MSGQ);
erts_proc_notify_new_message(rcvr,
#ifdef ERTS_SMP
*rcvr_locks
#else
0
#endif
);
}
}
/* Add a message last in message queue */
void
erts_queue_message(Process* receiver,
ErtsProcLocks *receiver_locks,
ErlHeapFragment* bp,
Eterm message,
Eterm seq_trace_token
#ifdef USE_VM_PROBES
, Eterm dt_utag
#endif
)
{
ErlMessage* mp;
#ifdef ERTS_SMP
ErtsProcLocks need_locks;
#else
ASSERT(bp != NULL || receiver->mbuf == NULL);
#endif
ERTS_SMP_LC_ASSERT(*receiver_locks == erts_proc_lc_my_proc_locks(receiver));
mp = message_alloc();
#ifdef ERTS_SMP
need_locks = ~(*receiver_locks) & (ERTS_PROC_LOCK_MSGQ
| ERTS_PROC_LOCK_STATUS);
if (need_locks) {
*receiver_locks |= need_locks;
if (erts_smp_proc_trylock(receiver, need_locks) == EBUSY) {
if (need_locks == ERTS_PROC_LOCK_MSGQ) {
erts_smp_proc_unlock(receiver, ERTS_PROC_LOCK_STATUS);
need_locks = (ERTS_PROC_LOCK_MSGQ
| ERTS_PROC_LOCK_STATUS);
}
erts_smp_proc_lock(receiver, need_locks);
}
}
if (receiver->is_exiting || ERTS_PROC_PENDING_EXIT(receiver)) {
/* Drop message if receiver is exiting or has a pending
* exit ...
*/
if (bp)
free_message_buffer(bp);
message_free(mp);
return;
}
#endif
ERL_MESSAGE_TERM(mp) = message;
ERL_MESSAGE_TOKEN(mp) = seq_trace_token;
#ifdef USE_VM_PROBES
ERL_MESSAGE_DT_UTAG(mp) = dt_utag;
#endif
mp->next = NULL;
mp->data.heap_frag = bp;
#ifdef ERTS_SMP
if (*receiver_locks & ERTS_PROC_LOCK_MAIN) {
/*
* We move 'in queue' to 'private queue' and place
* message at the end of 'private queue' in order
* to ensure that the 'in queue' doesn't contain
* references into the heap. By ensuring this,
* we don't need to include the 'in queue' in
* the root set when garbage collecting.
*/
ERTS_SMP_MSGQ_MV_INQ2PRIVQ(receiver);
LINK_MESSAGE_PRIVQ(receiver, mp);
}
else {
LINK_MESSAGE(receiver, mp);
}
#else
LINK_MESSAGE(receiver, mp);
#endif
#ifdef USE_VM_PROBES
if (DTRACE_ENABLED(message_queued)) {
DTRACE_CHARBUF(receiver_name, DTRACE_TERM_BUF_SIZE);
Sint tok_label = 0;
Sint tok_lastcnt = 0;
Sint tok_serial = 0;
dtrace_proc_str(receiver, receiver_name);
if (seq_trace_token != NIL && is_tuple(seq_trace_token)) {
tok_label = signed_val(SEQ_TRACE_T_LABEL(seq_trace_token));
tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(seq_trace_token));
tok_serial = signed_val(SEQ_TRACE_T_SERIAL(seq_trace_token));
}
DTRACE6(message_queued,
receiver_name, size_object(message), receiver->msg.len,
tok_label, tok_lastcnt, tok_serial);
}
#endif
notify_new_message(receiver);
if (IS_TRACED_FL(receiver, F_TRACE_RECEIVE)) {
trace_receive(receiver, message);
}
#ifndef ERTS_SMP
ERTS_HOLE_CHECK(receiver);
#endif
}
Sint
erts_send_message(Process* sender,
Process* receiver,
ErtsProcLocks *receiver_locks,
Eterm message,
unsigned flags)
{
Uint msize;
ErtsMessage* mp;
ErlOffHeap *ohp;
Eterm token = NIL;
Sint res = 0;
#ifdef USE_VM_PROBES
DTRACE_CHARBUF(sender_name, 64);
DTRACE_CHARBUF(receiver_name, 64);
Sint tok_label = 0;
Sint tok_lastcnt = 0;
Sint tok_serial = 0;
Eterm utag = NIL;
#endif
erts_aint32_t receiver_state;
#ifdef SHCOPY_SEND
erts_shcopy_t info;
#else
erts_literal_area_t litarea;
INITIALIZE_LITERAL_PURGE_AREA(litarea);
#endif
#ifdef USE_VM_PROBES
*sender_name = *receiver_name = '\0';
if (DTRACE_ENABLED(message_send)) {
erts_snprintf(sender_name, sizeof(DTRACE_CHARBUF_NAME(sender_name)),
"%T", sender->common.id);
erts_snprintf(receiver_name, sizeof(DTRACE_CHARBUF_NAME(receiver_name)),
"%T", receiver->common.id);
}
#endif
receiver_state = erts_atomic32_read_nob(&receiver->state);
if (SEQ_TRACE_TOKEN(sender) != NIL && !(flags & ERTS_SND_FLG_NO_SEQ_TRACE)) {
Eterm* hp;
Eterm stoken = SEQ_TRACE_TOKEN(sender);
Uint seq_trace_size = 0;
#ifdef USE_VM_PROBES
Uint dt_utag_size = 0;
#endif
/* SHCOPY corrupts the heap between
* copy_shared_calculate, and
* copy_shared_perform. (it inserts move_markers like the gc).
* Make sure we don't use the heap between those instances.
*/
if (have_seqtrace(stoken)) {
seq_trace_update_send(sender);
seq_trace_output(stoken, message, SEQ_TRACE_SEND,
receiver->common.id, sender);
seq_trace_size = 6; /* TUPLE5 */
}
#ifdef USE_VM_PROBES
if (DT_UTAG_FLAGS(sender) & DT_UTAG_SPREADING) {
dt_utag_size = size_object(DT_UTAG(sender));
} else if (stoken == am_have_dt_utag ) {
stoken = NIL;
}
#endif
#ifdef SHCOPY_SEND
INITIALIZE_SHCOPY(info);
msize = copy_shared_calculate(message, &info);
#else
msize = size_object_litopt(message, &litarea);
#endif
mp = erts_alloc_message_heap_state(receiver,
&receiver_state,
receiver_locks,
(msize
#ifdef USE_VM_PROBES
+ dt_utag_size
#endif
+ seq_trace_size),
&hp,
&ohp);
#ifdef SHCOPY_SEND
if (is_not_immed(message))
message = copy_shared_perform(message, msize, &info, &hp, ohp);
DESTROY_SHCOPY(info);
#else
if (is_not_immed(message))
message = copy_struct_litopt(message, msize, &hp, ohp, &litarea);
#endif
if (is_immed(stoken))
token = stoken;
else
token = copy_struct(stoken, seq_trace_size, &hp, ohp);
#ifdef USE_VM_PROBES
if (DT_UTAG_FLAGS(sender) & DT_UTAG_SPREADING) {
if (is_immed(DT_UTAG(sender)))
utag = DT_UTAG(sender);
else
utag = copy_struct(DT_UTAG(sender), dt_utag_size, &hp, ohp);
}
if (DTRACE_ENABLED(message_send)) {
if (have_seqtrace(stoken)) {
tok_label = signed_val(SEQ_TRACE_T_LABEL(stoken));
tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(stoken));
tok_serial = signed_val(SEQ_TRACE_T_SERIAL(stoken));
}
DTRACE6(message_send, sender_name, receiver_name,
msize, tok_label, tok_lastcnt, tok_serial);
}
#endif
} else {
Eterm *hp;
if (receiver == sender && !(receiver_state & ERTS_PSFLG_OFF_HEAP_MSGQ)) {
mp = erts_alloc_message(0, NULL);
msize = 0;
}
else {
#ifdef SHCOPY_SEND
INITIALIZE_SHCOPY(info);
msize = copy_shared_calculate(message, &info);
#else
msize = size_object_litopt(message, &litarea);
#endif
mp = erts_alloc_message_heap_state(receiver,
&receiver_state,
receiver_locks,
msize,
&hp,
&ohp);
#ifdef SHCOPY_SEND
if (is_not_immed(message))
message = copy_shared_perform(message, msize, &info, &hp, ohp);
DESTROY_SHCOPY(info);
#else
if (is_not_immed(message))
message = copy_struct_litopt(message, msize, &hp, ohp, &litarea);
#endif
}
#ifdef USE_VM_PROBES
DTRACE6(message_send, sender_name, receiver_name,
msize, tok_label, tok_lastcnt, tok_serial);
#endif
}
ERL_MESSAGE_TOKEN(mp) = token;
#ifdef USE_VM_PROBES
ERL_MESSAGE_DT_UTAG(mp) = utag;
#endif
res = queue_message(receiver,
&receiver_state,
*receiver_locks,
mp, message,
sender->common.id);
return res;
}
void
erts_deliver_exit_message(Eterm from, Process *to, ErtsProcLocks *to_locksp,
Eterm reason, Eterm token)
{
Eterm mess;
Eterm save;
Eterm from_copy;
Uint sz_reason;
Uint sz_token;
Uint sz_from;
Eterm* hp;
Eterm temptoken;
ErtsMessage* mp;
ErlOffHeap *ohp;
#ifdef SHCOPY_SEND
erts_shcopy_t info;
#endif
if (have_seqtrace(token)) {
ASSERT(is_tuple(token));
sz_token = size_object(token);
sz_from = size_object(from);
#ifdef SHCOPY_SEND
INITIALIZE_SHCOPY(info);
sz_reason = copy_shared_calculate(reason, &info);
#else
sz_reason = size_object(reason);
#endif
mp = erts_alloc_message_heap(to, to_locksp,
sz_reason + sz_from + sz_token + 4,
&hp, &ohp);
#ifdef SHCOPY_SEND
mess = copy_shared_perform(reason, sz_reason, &info, &hp, ohp);
DESTROY_SHCOPY(info);
#else
mess = copy_struct(reason, sz_reason, &hp, ohp);
#endif
from_copy = copy_struct(from, sz_from, &hp, ohp);
save = TUPLE3(hp, am_EXIT, from_copy, mess);
hp += 4;
/* the trace token must in this case be updated by the caller */
seq_trace_output(token, save, SEQ_TRACE_SEND, to->common.id, NULL);
temptoken = copy_struct(token, sz_token, &hp, ohp);
ERL_MESSAGE_TOKEN(mp) = temptoken;
erts_queue_message(to, *to_locksp, mp, save, am_system);
} else {
sz_from = IS_CONST(from) ? 0 : size_object(from);
#ifdef SHCOPY_SEND
INITIALIZE_SHCOPY(info);
sz_reason = copy_shared_calculate(reason, &info);
#else
sz_reason = size_object(reason);
#endif
mp = erts_alloc_message_heap(to, to_locksp,
sz_reason+sz_from+4, &hp, &ohp);
#ifdef SHCOPY_SEND
mess = copy_shared_perform(reason, sz_reason, &info, &hp, ohp);
DESTROY_SHCOPY(info);
#else
mess = copy_struct(reason, sz_reason, &hp, ohp);
#endif
from_copy = (IS_CONST(from)
? from
: copy_struct(from, sz_from, &hp, ohp));
save = TUPLE3(hp, am_EXIT, from_copy, mess);
erts_queue_message(to, *to_locksp, mp, save, am_system);
}
}
//将消息放入目标进程的消息队列中
static Sint
queue_message(Process *c_p,
Process* receiver,
ErtsProcLocks *receiver_locks,
erts_aint32_t *receiver_state,
ErlHeapFragment* bp,
Eterm message,
Eterm seq_trace_token
#ifdef USE_VM_PROBES
, Eterm dt_utag
#endif
)
{
Sint res;
ErlMessage* mp;
int locked_msgq = 0;
erts_aint_t state;
#ifndef ERTS_SMP
ASSERT(bp != NULL || receiver->mbuf == NULL);
#endif
ERTS_SMP_LC_ASSERT(*receiver_locks == erts_proc_lc_my_proc_locks(receiver));
mp = message_alloc();
if (receiver_state){
state = *receiver_state;
}else{
state = erts_smp_atomic32_read_acqb(&receiver->state);
}
#ifdef ERTS_SMP
//如果目标进程处在退出的状态，直接进入退出清理
if (state & (ERTS_PSFLG_EXITING|ERTS_PSFLG_PENDING_EXIT)){
goto exiting;
}
//如果当前没有目标Erlang进程的消息队列锁
//尝试获取消息队列的锁
if (!(*receiver_locks & ERTS_PROC_LOCK_MSGQ)) {
if (erts_smp_proc_trylock(receiver, ERTS_PROC_LOCK_MSGQ) == EBUSY) {
ErtsProcLocks need_locks = ERTS_PROC_LOCK_MSGQ;
if (*receiver_locks & ERTS_PROC_LOCK_STATUS) {
erts_smp_proc_unlock(receiver, ERTS_PROC_LOCK_STATUS);
need_locks |= ERTS_PROC_LOCK_STATUS;
}
erts_smp_proc_lock(receiver, need_locks);
}
locked_msgq = 1;
state = erts_smp_atomic32_read_nob(&receiver->state);
//获取目标Erlang进程的状态
if (receiver_state){
*receiver_state = state;
}
}
#endif
//Erlang进程处于退出的状态
//直接释放目标进程的锁，和当前消息
if (state & (ERTS_PSFLG_PENDING_EXIT|ERTS_PSFLG_EXITING)) {
#ifdef ERTS_SMP
exiting:
#endif
/* Drop message if receiver is exiting or has a pending exit... */
if (locked_msgq){
erts_smp_proc_unlock(receiver, ERTS_PROC_LOCK_MSGQ);
}
if (bp){
free_message_buffer(bp);
}
message_free(mp);
return 0;
}
//从此处可以看出，放入目标进程的消息，只是对当前进程的消息的一个指针应用
//那我们需要找出，message是如何被处理的，何时增加的引用计数
ERL_MESSAGE_TERM(mp) = message;
ERL_MESSAGE_TOKEN(mp) = seq_trace_token;
#ifdef USE_VM_PROBES
ERL_MESSAGE_DT_UTAG(mp) = dt_utag;
#endif
mp->next = NULL;
mp->data.heap_frag = bp;
#ifndef ERTS_SMP
res = receiver->msg.len;
#else
res = receiver->msg_inq.len;
//把消息attach的目标Erlang进程的消息队列或者private
//的消息队列
if (*receiver_locks & ERTS_PROC_LOCK_MAIN) {
/*
* We move 'in queue' to 'private queue' and place
* message at the end of 'private queue' in order
* to ensure that the 'in queue' doesn't contain
* references into the heap. By ensuring this,
* we don't need to include the 'in queue' in
* the root set when garbage collecting.
*/
//这个时候可以操作msg_inq和msg
res += receiver->msg.len;
ERTS_SMP_MSGQ_MV_INQ2PRIVQ(receiver);
LINK_MESSAGE_PRIVQ(receiver, mp);
}
else
#endif
{
//这个时候只操作msg_inq
LINK_MESSAGE(receiver, mp);
}
#ifdef USE_VM_PROBES
if (DTRACE_ENABLED(message_queued)) {
DTRACE_CHARBUF(receiver_name, DTRACE_TERM_BUF_SIZE);
Sint tok_label = 0;
Sint tok_lastcnt = 0;
Sint tok_serial = 0;
dtrace_proc_str(receiver, receiver_name);
if (seq_trace_token != NIL && is_tuple(seq_trace_token)) {
tok_label = signed_val(SEQ_TRACE_T_LABEL(seq_trace_token));
tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(seq_trace_token));
tok_serial = signed_val(SEQ_TRACE_T_SERIAL(seq_trace_token));
}
DTRACE6(message_queued,
receiver_name, size_object(message), receiver->msg.len,
tok_label, tok_lastcnt, tok_serial);
}
#endif
if (IS_TRACED_FL(receiver, F_TRACE_RECEIVE)){
trace_receive(receiver, message);
}
if (locked_msgq){
erts_smp_proc_unlock(receiver, ERTS_PROC_LOCK_MSGQ);
}
erts_proc_notify_new_message(receiver,
#ifdef ERTS_SMP
*receiver_locks
#else
0
#endif
);
#ifndef ERTS_SMP
ERTS_HOLE_CHECK(receiver);
#endif
return res;
}
static void
setup_reference_table(void)
{
ErlHeapFragment *hfp;
DistEntry *dep;
HashInfo hi;
int i, max;
DeclareTmpHeapNoproc(heap,3);
inserted_bins = NULL;
hash_get_info(&hi, &erts_node_table);
referred_nodes = erts_alloc(ERTS_ALC_T_NC_TMP,
hi.objs*sizeof(ReferredNode));
no_referred_nodes = 0;
hash_foreach(&erts_node_table, init_referred_node, NULL);
ASSERT(no_referred_nodes == hi.objs);
hash_get_info(&hi, &erts_dist_table);
referred_dists = erts_alloc(ERTS_ALC_T_NC_TMP,
hi.objs*sizeof(ReferredDist));
no_referred_dists = 0;
hash_foreach(&erts_dist_table, init_referred_dist, NULL);
ASSERT(no_referred_dists == hi.objs);
/* Go through the hole system, and build a table of all references
to ErlNode and DistEntry structures */
erts_debug_callback_timer_foreach(try_delete_node,
insert_delayed_delete_node,
NULL);
erts_debug_callback_timer_foreach(try_delete_dist_entry,
insert_delayed_delete_dist_entry,
NULL);
UseTmpHeapNoproc(3);
insert_node(erts_this_node,
SYSTEM_REF,
TUPLE2(&heap[0], AM_system, am_undefined));
UnUseTmpHeapNoproc(3);
max = erts_ptab_max(&erts_proc);
/* Insert all processes */
for (i = 0; i < max; i++) {
Process *proc = erts_pix2proc(i);
if (proc) {
int mli;
ErtsMessage *msg_list[] = {
proc->msg.first,
#ifdef ERTS_SMP
proc->msg_inq.first,
#endif
proc->msg_frag};
/* Insert Heap */
insert_offheap(&(proc->off_heap),
HEAP_REF,
proc->common.id);
/* Insert heap fragments buffers */
for(hfp = proc->mbuf; hfp; hfp = hfp->next)
insert_offheap(&(hfp->off_heap),
HEAP_REF,
proc->common.id);
/* Insert msg buffers */
for (mli = 0; mli < sizeof(msg_list)/sizeof(msg_list[0]); mli++) {
ErtsMessage *msg;
for (msg = msg_list[mli]; msg; msg = msg->next) {
ErlHeapFragment *heap_frag = NULL;
if (msg->data.attached) {
if (msg->data.attached == ERTS_MSG_COMBINED_HFRAG)
heap_frag = &msg->hfrag;
else if (is_value(ERL_MESSAGE_TERM(msg)))
heap_frag = msg->data.heap_frag;
else {
if (msg->data.dist_ext->dep)
insert_dist_entry(msg->data.dist_ext->dep,
HEAP_REF, proc->common.id, 0);
if (is_not_nil(ERL_MESSAGE_TOKEN(msg)))
heap_frag = erts_dist_ext_trailer(msg->data.dist_ext);
}
}
while (heap_frag) {
insert_offheap(&(heap_frag->off_heap),
HEAP_REF,
proc->common.id);
heap_frag = heap_frag->next;
}
}
}
/* Insert links */
if (ERTS_P_LINKS(proc))
insert_links(ERTS_P_LINKS(proc), proc->common.id);
if (ERTS_P_MONITORS(proc))
insert_monitors(ERTS_P_MONITORS(proc), proc->common.id);
/* Insert controller */
{
DistEntry *dep = ERTS_PROC_GET_DIST_ENTRY(proc);
if (dep)
insert_dist_entry(dep, CTRL_REF, proc->common.id, 0);
}
}
}
#ifdef ERTS_SMP
erts_foreach_sys_msg_in_q(insert_sys_msg);
#endif
/* Insert all ports */
max = erts_ptab_max(&erts_port);
for (i = 0; i < max; i++) {
ErlOffHeap *ohp;
erts_aint32_t state;
Port *prt;
prt = erts_pix2port(i);
if (!prt)
continue;
state = erts_atomic32_read_nob(&prt->state);
if (state & ERTS_PORT_SFLGS_DEAD)
continue;
/* Insert links */
if (ERTS_P_LINKS(prt))
insert_links(ERTS_P_LINKS(prt), prt->common.id);
/* Insert monitors */
if (ERTS_P_MONITORS(prt))
insert_monitors(ERTS_P_MONITORS(prt), prt->common.id);
/* Insert port data */
ohp = erts_port_data_offheap(prt);
if (ohp)
insert_offheap(ohp, HEAP_REF, prt->common.id);
/* Insert controller */
if (prt->dist_entry)
insert_dist_entry(prt->dist_entry,
CTRL_REF,
prt->common.id,
0);
}
{ /* Add binaries stored elsewhere ... */
ErlOffHeap oh;
ProcBin pb[2];
int i = 0;
Binary *default_match_spec;
Binary *default_meta_match_spec;
oh.first = NULL;
/* Only the ProcBin members thing_word, val and next will be inspected
(by insert_offheap()) */
#undef ADD_BINARY
#define ADD_BINARY(Bin) \
if ((Bin)) { \
pb[i].thing_word = REFC_BINARY_SUBTAG; \
pb[i].val = (Bin); \
pb[i].next = oh.first; \
oh.first = (struct erl_off_heap_header*) &pb[i]; \
i++; \
}
erts_get_default_trace_pattern(NULL,
&default_match_spec,
&default_meta_match_spec,
NULL,
NULL);
ADD_BINARY(default_match_spec);
ADD_BINARY(default_meta_match_spec);
insert_offheap(&oh, BIN_REF, AM_match_spec);
#undef ADD_BINARY
}
/* Insert all dist links */
for(dep = erts_visible_dist_entries; dep; dep = dep->next) {
if(dep->nlinks)
insert_links2(dep->nlinks, dep->sysname);
if(dep->node_links)
insert_links(dep->node_links, dep->sysname);
if(dep->monitors)
insert_monitors(dep->monitors, dep->sysname);
}
for(dep = erts_hidden_dist_entries; dep; dep = dep->next) {
if(dep->nlinks)
insert_links2(dep->nlinks, dep->sysname);
if(dep->node_links)
insert_links(dep->node_links, dep->sysname);
if(dep->monitors)
insert_monitors(dep->monitors, dep->sysname);
}
/* Not connected dist entries should not have any links,
but inspect them anyway */
for(dep = erts_not_connected_dist_entries; dep; dep = dep->next) {
if(dep->nlinks)
insert_links2(dep->nlinks, dep->sysname);
if(dep->node_links)
insert_links(dep->node_links, dep->sysname);
if(dep->monitors)
insert_monitors(dep->monitors, dep->sysname);
}
/* Insert all ets tables */
erts_db_foreach_table(insert_ets_table, NULL);
/* Insert all bif timers */
erts_debug_bif_timer_foreach(insert_bif_timer, NULL);
/* Insert node table (references to dist) */
hash_foreach(&erts_node_table, insert_erl_node, NULL);
}
/* Add messages last in message queue */
static void
queue_messages(Process* receiver,
ErtsProcLocks receiver_locks,
ErtsMessage* first,
ErtsMessage** last,
Uint len)
{
int locked_msgq = 0;
erts_aint32_t state;
#ifdef DEBUG
{
ErtsMessage* fmsg = ERTS_SIG_IS_MSG(first) ? first : first->next;
ASSERT(fmsg);
ASSERT(is_value(ERL_MESSAGE_TERM(fmsg)));
ASSERT(is_value(ERL_MESSAGE_FROM(fmsg)));
ASSERT(ERL_MESSAGE_TOKEN(fmsg) == am_undefined ||
ERL_MESSAGE_TOKEN(fmsg) == NIL ||
is_tuple(ERL_MESSAGE_TOKEN(fmsg)));
}
#endif
ERTS_LC_ASSERT((erts_proc_lc_my_proc_locks(receiver) & ERTS_PROC_LOCK_MSGQ)
== (receiver_locks & ERTS_PROC_LOCK_MSGQ));
if (!(receiver_locks & ERTS_PROC_LOCK_MSGQ)) {
erts_proc_lock(receiver, ERTS_PROC_LOCK_MSGQ);
locked_msgq = 1;
}
state = erts_atomic32_read_nob(&receiver->state);
if (state & ERTS_PSFLG_EXITING) {
/* Drop message if receiver is exiting or has a pending exit... */
if (locked_msgq)
erts_proc_unlock(receiver, ERTS_PROC_LOCK_MSGQ);
if (ERTS_SIG_IS_NON_MSG(first)) {
ErtsSchedulerData* esdp = erts_get_scheduler_data();
ASSERT(esdp);
ASSERT(!esdp->pending_signal.sig);
esdp->pending_signal.sig = (ErtsSignal*) first;
esdp->pending_signal.to = receiver->common.id;
first = first->next;
}
erts_cleanup_messages(first);
return;
}
if (last == &first->next) {
ASSERT(len == 1);
LINK_MESSAGE(receiver, first);
}
else {
erts_enqueue_signals(receiver, first, last, NULL, len, state);
}
if (receiver_locks & ERTS_PROC_LOCK_MAIN)
erts_proc_sig_fetch(receiver);
if (locked_msgq) {
erts_proc_unlock(receiver, ERTS_PROC_LOCK_MSGQ);
}
if (last == &first->next)
erts_proc_notify_new_message(receiver, receiver_locks);
else
erts_proc_notify_new_sig(receiver, state, ERTS_PSFLG_ACTIVE);
}
Sint
erts_send_message(Process* sender,
Process* receiver,
ErtsProcLocks *receiver_locks,
Eterm message,
unsigned flags)
{
Uint msize;
ErlHeapFragment* bp = NULL;
Eterm token = NIL;
Sint res = 0;
#ifdef USE_VM_PROBES
DTRACE_CHARBUF(sender_name, 64);
DTRACE_CHARBUF(receiver_name, 64);
Sint tok_label = 0;
Sint tok_lastcnt = 0;
Sint tok_serial = 0;
#endif
BM_STOP_TIMER(system);
BM_MESSAGE(message,sender,receiver);
BM_START_TIMER(send);
#ifdef USE_VM_PROBES
*sender_name = *receiver_name = '\0';
if (DTRACE_ENABLED(message_send)) {
erts_snprintf(sender_name, sizeof(DTRACE_CHARBUF_NAME(sender_name)),
"%T", sender->common.id);
erts_snprintf(receiver_name, sizeof(DTRACE_CHARBUF_NAME(receiver_name)),
"%T", receiver->common.id);
}
#endif
if (SEQ_TRACE_TOKEN(sender) != NIL && !(flags & ERTS_SND_FLG_NO_SEQ_TRACE)) {
Eterm* hp;
Eterm stoken = SEQ_TRACE_TOKEN(sender);
Uint seq_trace_size = 0;
#ifdef USE_VM_PROBES
Uint dt_utag_size = 0;
Eterm utag = NIL;
#endif
BM_SWAP_TIMER(send,size);
msize = size_object(message);
BM_SWAP_TIMER(size,send);
#ifdef USE_VM_PROBES
if (stoken != am_have_dt_utag) {
#endif
seq_trace_update_send(sender);
seq_trace_output(stoken, message, SEQ_TRACE_SEND,
receiver->common.id, sender);
seq_trace_size = 6; /* TUPLE5 */
#ifdef USE_VM_PROBES
}
if (DT_UTAG_FLAGS(sender) & DT_UTAG_SPREADING) {
dt_utag_size = size_object(DT_UTAG(sender));
} else if (stoken == am_have_dt_utag ) {
stoken = NIL;
}
#endif
bp = new_message_buffer(msize + seq_trace_size
#ifdef USE_VM_PROBES
+ dt_utag_size
#endif
);
hp = bp->mem;
BM_SWAP_TIMER(send,copy);
token = copy_struct(stoken,
seq_trace_size,
&hp,
&bp->off_heap);
message = copy_struct(message, msize, &hp, &bp->off_heap);
#ifdef USE_VM_PROBES
if (DT_UTAG_FLAGS(sender) & DT_UTAG_SPREADING) {
utag = copy_struct(DT_UTAG(sender), dt_utag_size, &hp, &bp->off_heap);
#ifdef DTRACE_TAG_HARDDEBUG
erts_fprintf(stderr,
"Dtrace -> (%T) Spreading tag (%T) with "
"message %T!\r\n",sender->common.id, utag, message);
#endif
}
#endif
BM_MESSAGE_COPIED(msize);
BM_SWAP_TIMER(copy,send);
#ifdef USE_VM_PROBES
if (DTRACE_ENABLED(message_send)) {
if (stoken != NIL && stoken != am_have_dt_utag) {
tok_label = signed_val(SEQ_TRACE_T_LABEL(stoken));
tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(stoken));
tok_serial = signed_val(SEQ_TRACE_T_SERIAL(stoken));
}
DTRACE6(message_send, sender_name, receiver_name,
msize, tok_label, tok_lastcnt, tok_serial);
}
#endif
res = queue_message(NULL,
receiver,
receiver_locks,
NULL,
bp,
message,
token
#ifdef USE_VM_PROBES
, utag
#endif
);
BM_SWAP_TIMER(send,system);
} else if (sender == receiver) {
/* Drop message if receiver has a pending exit ... */
#ifdef ERTS_SMP
ErtsProcLocks need_locks = (~(*receiver_locks)
& (ERTS_PROC_LOCK_MSGQ
| ERTS_PROC_LOCK_STATUS));
if (need_locks) {
*receiver_locks |= need_locks;
if (erts_smp_proc_trylock(receiver, need_locks) == EBUSY) {
if (need_locks == ERTS_PROC_LOCK_MSGQ) {
erts_smp_proc_unlock(receiver, ERTS_PROC_LOCK_STATUS);
need_locks = ERTS_PROC_LOCK_MSGQ|ERTS_PROC_LOCK_STATUS;
}
erts_smp_proc_lock(receiver, need_locks);
}
}
if (!ERTS_PROC_PENDING_EXIT(receiver))
#endif
{
ErlMessage* mp = message_alloc();
DTRACE6(message_send, sender_name, receiver_name,
size_object(message), tok_label, tok_lastcnt, tok_serial);
mp->data.attached = NULL;
ERL_MESSAGE_TERM(mp) = message;
ERL_MESSAGE_TOKEN(mp) = NIL;
#ifdef USE_VM_PROBES
ERL_MESSAGE_DT_UTAG(mp) = NIL;
#endif
mp->next = NULL;
/*
* We move 'in queue' to 'private queue' and place
* message at the end of 'private queue' in order
* to ensure that the 'in queue' doesn't contain
* references into the heap. By ensuring this,
* we don't need to include the 'in queue' in
* the root set when garbage collecting.
*/
ERTS_SMP_MSGQ_MV_INQ2PRIVQ(receiver);
LINK_MESSAGE_PRIVQ(receiver, mp);
res = receiver->msg.len;
if (IS_TRACED_FL(receiver, F_TRACE_RECEIVE)) {
trace_receive(receiver, message);
}
}
BM_SWAP_TIMER(send,system);
} else {
ErlOffHeap *ohp;
Eterm *hp;
erts_aint32_t state;
BM_SWAP_TIMER(send,size);
msize = size_object(message);
BM_SWAP_TIMER(size,send);
hp = erts_alloc_message_heap_state(msize,
&bp,
&ohp,
receiver,
receiver_locks,
&state);
BM_SWAP_TIMER(send,copy);
message = copy_struct(message, msize, &hp, ohp);
BM_MESSAGE_COPIED(msz);
BM_SWAP_TIMER(copy,send);
DTRACE6(message_send, sender_name, receiver_name,
msize, tok_label, tok_lastcnt, tok_serial);
res = queue_message(sender,
receiver,
receiver_locks,
&state,
bp,
message,
token
#ifdef USE_VM_PROBES
, NIL
#endif
);
BM_SWAP_TIMER(send,system);
}
return res;
}
void
erts_queue_dist_message(Process *rcvr,
ErtsProcLocks *rcvr_locks,
ErtsDistExternal *dist_ext,
Eterm token)
{
ErlMessage* mp;
#ifdef ERTS_SMP
ErtsProcLocks need_locks;
#endif
ERTS_SMP_LC_ASSERT(*rcvr_locks == erts_proc_lc_my_proc_locks(rcvr));
mp = message_alloc();
#ifdef ERTS_SMP
need_locks = ~(*rcvr_locks) & (ERTS_PROC_LOCK_MSGQ|ERTS_PROC_LOCK_STATUS);
if (need_locks) {
*rcvr_locks |= need_locks;
if (erts_smp_proc_trylock(rcvr, need_locks) == EBUSY) {
if (need_locks == ERTS_PROC_LOCK_MSGQ) {
erts_smp_proc_unlock(rcvr, ERTS_PROC_LOCK_STATUS);
need_locks = (ERTS_PROC_LOCK_MSGQ
| ERTS_PROC_LOCK_STATUS);
}
erts_smp_proc_lock(rcvr, need_locks);
}
}
if (rcvr->is_exiting || ERTS_PROC_PENDING_EXIT(rcvr)) {
/* Drop message if receiver is exiting or has a pending exit ... */
if (is_not_nil(token)) {
ErlHeapFragment *heap_frag;
heap_frag = erts_dist_ext_trailer(mp->data.dist_ext);
erts_cleanup_offheap(&heap_frag->off_heap);
}
erts_free_dist_ext_copy(dist_ext);
message_free(mp);
}
else
#endif
if (IS_TRACED_FL(rcvr, F_TRACE_RECEIVE)) {
/* Ahh... need to decode it in order to trace it... */
ErlHeapFragment *mbuf;
Eterm msg;
message_free(mp);
msg = erts_msg_distext2heap(rcvr, rcvr_locks, &mbuf, &token, dist_ext);
if (is_value(msg))
erts_queue_message(rcvr, rcvr_locks, mbuf, msg, token);
}
else {
/* Enqueue message on external format */
ERL_MESSAGE_TERM(mp) = THE_NON_VALUE;
ERL_MESSAGE_TOKEN(mp) = token;
mp->next = NULL;
mp->data.dist_ext = dist_ext;
LINK_MESSAGE(rcvr, mp);
notify_new_message(rcvr);
}
}