void
erts_lock_node_tables_and_entries(void)
{
int i;
for (i = 0; i < ERTS_NO_OF_DIST_ENTRY_MUTEXES; i++)
erts_smp_mtx_lock(&dist_entry_mutexes[i]);
erts_smp_mtx_lock(&erts_node_table_mtx);
erts_smp_mtx_lock(&erts_dist_table_mtx);
}
void erts_print_node_info(int to,
void *to_arg,
Eterm sysname,
int *no_sysname,
int *no_total)
{
int lock = !ERTS_IS_CRASH_DUMPING;
struct pn_data pnd;
pnd.to = to;
pnd.to_arg = to_arg;
pnd.sysname = sysname;
pnd.no_sysname = 0;
pnd.no_total = 0;
if (lock)
erts_smp_mtx_lock(&erts_node_table_mtx);
hash_foreach(&erts_node_table, print_node, (void *) &pnd);
if (pnd.no_sysname != 0) {
erts_print(to, to_arg, "\n");
}
if (lock)
erts_smp_mtx_unlock(&erts_node_table_mtx);
if(no_sysname)
*no_sysname = pnd.no_sysname;
if(no_total)
*no_total = pnd.no_total;
}
/* get a timestamp */
void
get_now(Uint* megasec, Uint* sec, Uint* microsec)
{
SysTimeval now;
erts_smp_mtx_lock(&erts_timeofday_mtx);
get_tolerant_timeofday(&now);
do_erts_deliver_time(&now);
/* Make sure time is later than last */
if (then.tv_sec > now.tv_sec ||
(then.tv_sec == now.tv_sec && then.tv_usec >= now.tv_usec)) {
now = then;
now.tv_usec++;
}
/* Check for carry from above + general reasonability */
if (now.tv_usec >= 1000000) {
now.tv_usec = 0;
now.tv_sec++;
}
then = now;
erts_smp_mtx_unlock(&erts_timeofday_mtx);
*megasec = (Uint) (now.tv_sec / 1000000);
*sec = (Uint) (now.tv_sec % 1000000);
*microsec = (Uint) (now.tv_usec);
}
void
elapsed_time_both(UWord *ms_user, UWord *ms_sys,
UWord *ms_user_diff, UWord *ms_sys_diff)
{
UWord prev_total_user, prev_total_sys;
UWord total_user, total_sys;
SysTimes now;
sys_times(&now);
total_user = (now.tms_utime * 1000) / SYS_CLK_TCK;
total_sys = (now.tms_stime * 1000) / SYS_CLK_TCK;
if (ms_user != NULL)
*ms_user = total_user;
if (ms_sys != NULL)
*ms_sys = total_sys;
erts_smp_mtx_lock(&erts_timeofday_mtx);
prev_total_user = (t_start.tms_utime * 1000) / SYS_CLK_TCK;
prev_total_sys = (t_start.tms_stime * 1000) / SYS_CLK_TCK;
t_start = now;
erts_smp_mtx_unlock(&erts_timeofday_mtx);
if (ms_user_diff != NULL)
*ms_user_diff = total_user - prev_total_user;
if (ms_sys_diff != NULL)
*ms_sys_diff = total_sys - prev_total_sys;
}
/*
** Get info about hash
*/
void safe_hash_get_info(SafeHashInfo *hi, SafeHash *h)
{
int size;
int i, lock_ix;
int max_depth = 0;
int objects = 0;
for (lock_ix=0; lock_ix<SAFE_HASH_LOCK_CNT; lock_ix++) {
erts_smp_mtx_lock(&h->lock_vec[lock_ix].mtx);
size = h->size_mask + 1;
for (i = lock_ix; i < size; i += SAFE_HASH_LOCK_CNT) {
int depth = 0;
SafeHashBucket* b = h->tab[i];
while (b != NULL) {
objects++;
depth++;
b = b->next;
}
if (depth > max_depth)
max_depth = depth;
}
erts_smp_mtx_unlock(&h->lock_vec[lock_ix].mtx);
}
hi->name = h->name;
hi->size = size;
hi->objs = objects;
hi->depth = max_depth;
}
/*
* Calller _must_ yield if we return 0
*/
int erts_try_seize_code_write_permission(Process* c_p)
{
int success;
#ifdef ERTS_SMP
ASSERT(!erts_smp_thr_progress_is_blocking()); /* to avoid deadlock */
#endif
ASSERT(c_p != NULL);
erts_smp_mtx_lock(&code_write_permission_mtx);
success = (code_writing_process == NULL);
if (success) {
code_writing_process = c_p;
#ifdef ERTS_ENABLE_LOCK_CHECK
erts_tsd_set(has_code_write_permission, (void *) 1);
#endif
}
else { /* Already locked */
struct code_write_queue_item* qitem;
ASSERT(code_writing_process != c_p);
qitem = erts_alloc(ERTS_ALC_T_CODE_IX_LOCK_Q, sizeof(*qitem));
qitem->p = c_p;
erts_proc_inc_refc(c_p);
qitem->next = code_write_queue;
code_write_queue = qitem;
erts_suspend(c_p, ERTS_PROC_LOCK_MAIN, NULL);
}
erts_smp_mtx_unlock(&code_write_permission_mtx);
return success;
}
Export *
erts_suspend_process_on_pending_purge_lambda(Process *c_p)
{
erts_smp_mtx_lock(&purge_state.mtx);
if (is_value(purge_state.module)) {
/*
* The process c_p is about to call a fun in the code
* that we are trying to purge. Suspend it and call
* erts_code_purger:pending_purge_lambda/3. The process
* will be resumed when the purge completes or aborts,
* and will then try to do the call again.
*/
if (purge_state.sp_ix >= purge_state.sp_size) {
Eterm *sprocs;
purge_state.sp_size += 100;
sprocs = erts_alloc(ERTS_ALC_T_PURGE_DATA,
(sizeof(ErlFunEntry *)
* purge_state.sp_size));
sys_memcpy((void *) sprocs,
(void *) purge_state.sprocs,
purge_state.sp_ix*sizeof(ErlFunEntry *));
if (purge_state.sprocs != &purge_state.def_sprocs[0])
erts_free(ERTS_ALC_T_PURGE_DATA, purge_state.sprocs);
purge_state.sprocs = sprocs;
}
purge_state.sprocs[purge_state.sp_ix++] = c_p->common.id;
erts_suspend(c_p, ERTS_PROC_LOCK_MAIN, NULL);
ERTS_VBUMP_ALL_REDS(c_p);
}
erts_smp_mtx_unlock(&purge_state.mtx);
return purge_state.pending_purge_lambda;
}
/*
Returns the amount of time left in ms until the timer 'p' is triggered.
0 is returned if 'p' isn't active.
0 is returned also if the timer is overdue (i.e., would have triggered
immediately if it hadn't been cancelled).
*/
Uint
erts_time_left(ErlTimer *p)
{
Uint left;
erts_short_time_t dt;
erts_smp_mtx_lock(&tiw_lock);
if (!p->active) {
erts_smp_mtx_unlock(&tiw_lock);
return 0;
}
if (p->slot < tiw_pos)
left = (p->count + 1) * TIW_SIZE + p->slot - tiw_pos;
else
left = p->count * TIW_SIZE + p->slot - tiw_pos;
dt = do_time_read();
if (left < dt)
left = 0;
else
left -= dt;
erts_smp_mtx_unlock(&tiw_lock);
return (Uint) left * TIW_ITIME;
}
void erts_p_slpq(void)
{
int i;
ErlTimer* p;
erts_smp_mtx_lock(&tiw_lock);
/* print the whole wheel, starting at the current position */
erts_printf("\ntiw_pos = %d tiw_nto %d\n", tiw_pos, tiw_nto);
i = tiw_pos;
if (tiw[i] != NULL) {
erts_printf("%d:\n", i);
for(p = tiw[i]; p != NULL; p = p->next) {
erts_printf(" (count %d, slot %d)\n",
p->count, p->slot);
}
}
for(i = (i+1)%TIW_SIZE; i != tiw_pos; i = (i+1)%TIW_SIZE) {
if (tiw[i] != NULL) {
erts_printf("%d:\n", i);
for(p = tiw[i]; p != NULL; p = p->next) {
erts_printf(" (count %d, slot %d)\n",
p->count, p->slot);
}
}
}
erts_smp_mtx_unlock(&tiw_lock);
}
void
erts_cancel_timer(ErlTimer* p)
{
erts_smp_mtx_lock(&tiw_lock);
if (!p->active) { /* allow repeated cancel (drivers) */
erts_smp_mtx_unlock(&tiw_lock);
return;
}
/* is it the 'min' timer, remove min */
if (p == tiw_min_ptr) {
tiw_min_ptr = NULL;
tiw_min = 0;
}
remove_timer(p);
p->slot = p->count = 0;
if (p->cancel != NULL) {
erts_smp_mtx_unlock(&tiw_lock);
(*p->cancel)(p->arg);
return;
}
erts_smp_mtx_unlock(&tiw_lock);
}
/*
** Find or insert an object in the hash table
*/
void* safe_hash_put(SafeHash* h, void* tmpl)
{
int grow_limit;
SafeHashValue hval = h->fun.hash(tmpl);
SafeHashBucket* b;
SafeHashBucket** head;
erts_smp_mtx_t* lock = &h->lock_vec[hval % SAFE_HASH_LOCK_CNT].mtx;
erts_smp_mtx_lock(lock);
head = &h->tab[hval & h->size_mask];
b = *head;
while(b != NULL) {
if ((b->hvalue == hval) && (h->fun.cmp(tmpl, (void*)b) == 0)) {
erts_smp_mtx_unlock(lock);
return b;
}
b = b->next;
}
b = (SafeHashBucket*) h->fun.alloc(tmpl);
b->hvalue = hval;
b->next = *head;
*head = b;
grow_limit = h->grow_limit;
erts_smp_mtx_unlock(lock);
if (erts_smp_atomic_inctest(&h->nitems) > grow_limit) {
rehash(h, grow_limit);
}
return (void*) b;
}
void erts_deliver_time(void) {
SysTimeval now;
erts_smp_mtx_lock(&erts_timeofday_mtx);
get_tolerant_timeofday(&now);
do_erts_deliver_time(&now);
erts_smp_mtx_unlock(&erts_timeofday_mtx);
}
/* Private export to erl_time_sup.c */
erts_short_time_t erts_next_time(void)
{
erts_short_time_t ret;
erts_smp_mtx_lock(&tiw_lock);
(void)do_time_update();
ret = next_time_internal();
erts_smp_mtx_unlock(&tiw_lock);
return ret;
}
/*
** Returns size of table in bytes. Stored objects not included.
**/
int safe_hash_table_sz(SafeHash *h)
{
int i, size;
for(i=0; h->name[i]; i++);
i++;
erts_smp_mtx_lock(&h->lock_vec[0].mtx); /* any lock will do to read size */
size = h->size_mask + 1;
erts_smp_mtx_unlock(&h->lock_vec[0].mtx);
return sizeof(SafeHash) + size*sizeof(SafeHashBucket*) + i;
}
void
erts_node_table_info(int to, void *to_arg)
{
int lock = !ERTS_IS_CRASH_DUMPING;
if (lock)
erts_smp_mtx_lock(&erts_node_table_mtx);
hash_info(to, to_arg, &erts_node_table);
if (lock)
erts_smp_mtx_unlock(&erts_node_table_mtx);
}
void
erts_set_this_node(Eterm sysname, Uint creation)
{
erts_smp_mtx_lock(&erts_node_table_mtx);
erts_smp_mtx_lock(&erts_dist_table_mtx);
(void) hash_erase(&erts_dist_table, (void *) erts_this_dist_entry);
erts_this_dist_entry->sysname = sysname;
erts_this_dist_entry->creation = creation;
(void) hash_put(&erts_dist_table, (void *) erts_this_dist_entry);
(void) hash_erase(&erts_node_table, (void *) erts_this_node);
erts_this_node->sysname = sysname;
erts_this_node->creation = creation;
(void) hash_put(&erts_node_table, (void *) erts_this_node);
erts_smp_mtx_unlock(&erts_dist_table_mtx);
erts_smp_mtx_unlock(&erts_node_table_mtx);
}
void
erts_set_dist_entry_not_connected(DistEntry *dep)
{
ERTS_SMP_LC_ASSERT(erts_lc_is_dist_entry_locked(dep));
erts_smp_mtx_lock(&erts_dist_table_mtx);
ASSERT(dep != erts_this_dist_entry);
ASSERT(is_internal_port(dep->cid));
if(dep->flags & DFLAG_PUBLISHED) {
if(dep->prev) {
ASSERT(is_in_de_list(dep, erts_visible_dist_entries));
dep->prev->next = dep->next;
}
else {
ASSERT(erts_visible_dist_entries == dep);
erts_visible_dist_entries = dep->next;
}
ASSERT(erts_no_of_visible_dist_entries > 0);
erts_no_of_visible_dist_entries--;
}
else {
if(dep->prev) {
ASSERT(is_in_de_list(dep, erts_hidden_dist_entries));
dep->prev->next = dep->next;
}
else {
ASSERT(erts_hidden_dist_entries == dep);
erts_hidden_dist_entries = dep->next;
}
ASSERT(erts_no_of_hidden_dist_entries > 0);
erts_no_of_hidden_dist_entries--;
}
if(dep->next)
dep->next->prev = dep->prev;
dep->status &= ~ERTS_DE_SFLG_CONNECTED;
dep->flags = 0;
dep->prev = NULL;
dep->cid = NIL;
dep->next = erts_not_connected_dist_entries;
if(erts_not_connected_dist_entries) {
ASSERT(erts_not_connected_dist_entries->prev == NULL);
erts_not_connected_dist_entries->prev = dep;
}
erts_not_connected_dist_entries = dep;
erts_no_of_not_connected_dist_entries++;
erts_smp_mtx_unlock(&erts_dist_table_mtx);
}
static ERTS_INLINE Uint32
acquire_bp_sched_ix(Process *c_p)
{
ErtsSchedulerData *esdp = erts_proc_sched_data(c_p);
ASSERT(esdp);
#ifdef ERTS_DIRTY_SCHEDULERS
if (ERTS_SCHEDULER_IS_DIRTY(esdp)) {
erts_smp_mtx_lock(&erts_dirty_bp_ix_mtx);
return (Uint32) erts_no_schedulers;
}
#endif
return (Uint32) esdp->no - 1;
}
erts_time_t
erts_get_time(void)
{
SysTimeval sys_tv;
erts_smp_mtx_lock(&erts_timeofday_mtx);
get_tolerant_timeofday(&sys_tv);
erts_smp_mtx_unlock(&erts_timeofday_mtx);
return sys_tv.tv_sec;
}
DistEntry *erts_find_or_insert_dist_entry(Eterm sysname)
{
DistEntry *res;
DistEntry de;
long refc;
de.sysname = sysname;
erts_smp_mtx_lock(&erts_dist_table_mtx);
res = hash_put(&erts_dist_table, (void *) &de);
refc = erts_refc_inctest(&res->refc, 0);
if (refc < 2) /* New or pending delete */
erts_refc_inc(&res->refc, 1);
erts_smp_mtx_unlock(&erts_dist_table_mtx);
return res;
}
static void
finalize_purge_operation(Process *c_p, int succeded)
{
Uint ix;
if (c_p)
erts_smp_proc_unlock(c_p, ERTS_PROC_LOCK_MAIN);
erts_smp_mtx_lock(&purge_state.mtx);
ASSERT(purge_state.module != THE_NON_VALUE);
purge_state.module = THE_NON_VALUE;
/*
* Resume all processes that have tried to call
* funs in this code.
*/
for (ix = 0; ix < purge_state.sp_ix; ix++) {
Process *rp = erts_pid2proc(NULL, 0,
purge_state.sprocs[ix],
ERTS_PROC_LOCK_STATUS);
if (rp) {
erts_resume(rp, ERTS_PROC_LOCK_STATUS);
erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS);
}
}
erts_smp_mtx_unlock(&purge_state.mtx);
if (c_p)
erts_smp_proc_lock(c_p, ERTS_PROC_LOCK_MAIN);
if (purge_state.sprocs != &purge_state.def_sprocs[0]) {
erts_free(ERTS_ALC_T_PURGE_DATA, purge_state.sprocs);
purge_state.sprocs = &purge_state.def_sprocs[0];
purge_state.sp_size = sizeof(purge_state.def_sprocs);
purge_state.sp_size /= sizeof(purge_state.def_sprocs[0]);
}
purge_state.sp_ix = 0;
if (purge_state.funs != &purge_state.def_funs[0]) {
erts_free(ERTS_ALC_T_PURGE_DATA, purge_state.funs);
purge_state.funs = &purge_state.def_funs[0];
purge_state.fe_size = sizeof(purge_state.def_funs);
purge_state.fe_size /= sizeof(purge_state.def_funs[0]);
}
purge_state.fe_ix = 0;
}
void
get_sys_now(Uint* megasec, Uint* sec, Uint* microsec)
{
SysTimeval now;
erts_smp_mtx_lock(&erts_timeofday_mtx);
sys_gettimeofday(&now);
erts_smp_mtx_unlock(&erts_timeofday_mtx);
*megasec = (Uint) (now.tv_sec / 1000000);
*sec = (Uint) (now.tv_sec % 1000000);
*microsec = (Uint) (now.tv_usec);
}
DistEntry *
erts_sysname_to_connected_dist_entry(Eterm sysname)
{
DistEntry de;
DistEntry *res_dep;
de.sysname = sysname;
if(erts_this_dist_entry->sysname == sysname) {
erts_refc_inc(&erts_this_dist_entry->refc, 2);
return erts_this_dist_entry;
}
erts_smp_mtx_lock(&erts_dist_table_mtx);
res_dep = (DistEntry *) hash_get(&erts_dist_table, (void *) &de);
if (res_dep) {
long refc = erts_refc_inctest(&res_dep->refc, 1);
if (refc < 2) /* Pending delete */
erts_refc_inc(&res_dep->refc, 1);
}
erts_smp_mtx_unlock(&erts_dist_table_mtx);
if (res_dep) {
erts_smp_mtx_t *mtxp;
#ifdef ERTS_SMP
mtxp = res_dep->mtxp;
#else
mtxp = NULL;
#endif
erts_smp_mtx_lock(mtxp);
if (is_nil(res_dep->cid)) {
erts_deref_dist_entry(res_dep);
res_dep = NULL;
}
erts_smp_mtx_unlock(mtxp);
}
return res_dep;
}
DistEntry *erts_find_dist_entry(Eterm sysname)
{
DistEntry *res;
DistEntry de;
de.sysname = sysname;
erts_smp_mtx_lock(&erts_dist_table_mtx);
res = hash_get(&erts_dist_table, (void *) &de);
if (res) {
long refc = erts_refc_inctest(&res->refc, 1);
if (refc < 2) /* Pending delete */
erts_refc_inc(&res->refc, 1);
}
erts_smp_mtx_unlock(&erts_dist_table_mtx);
return res;
}
static ErtsMonotonicTime clock_gettime_monotonic_verified(void)
{
ErtsMonotonicTime mtime;
mtime = (ErtsMonotonicTime) posix_clock_gettime(MONOTONIC_CLOCK_ID,
MONOTONIC_CLOCK_ID_STR);
erts_smp_mtx_lock(&internal_state.w.f.mtx);
if (mtime < internal_state.w.f.last_delivered)
mtime = internal_state.w.f.last_delivered;
else
internal_state.w.f.last_delivered = mtime;
erts_smp_mtx_unlock(&internal_state.w.f.mtx);
return mtime;
}
/*
** Find an object in the hash table
*/
void* safe_hash_get(SafeHash* h, void* tmpl)
{
SafeHashValue hval = h->fun.hash(tmpl);
SafeHashBucket* b;
erts_smp_mtx_t* lock = &h->lock_vec[hval % SAFE_HASH_LOCK_CNT].mtx;
erts_smp_mtx_lock(lock);
b = h->tab[hval & h->size_mask];
while(b != NULL) {
if ((b->hvalue == hval) && (h->fun.cmp(tmpl, (void*)b) == 0))
break;
b = b->next;
}
erts_smp_mtx_unlock(lock);
return (void*) b;
}
void erts_release_code_write_permission(void)
{
erts_smp_mtx_lock(&the_code_ix_queue_lock);
while (the_code_ix_queue != NULL) { /* unleash the entire herd */
struct code_ix_queue_item* qitem = the_code_ix_queue;
erts_smp_proc_lock(qitem->p, ERTS_PROC_LOCK_STATUS);
if (!ERTS_PROC_IS_EXITING(qitem->p)) {
erts_resume(qitem->p, ERTS_PROC_LOCK_STATUS);
}
erts_smp_proc_unlock(qitem->p, ERTS_PROC_LOCK_STATUS);
the_code_ix_queue = qitem->next;
erts_smp_proc_dec_refc(qitem->p);
erts_free(ERTS_ALC_T_CODE_IX_LOCK_Q, qitem);
}
the_code_ix_lock = 0;
erts_smp_mtx_unlock(&the_code_ix_queue_lock);
}
void erts_delete_dist_entry(DistEntry *dep)
{
ASSERT(dep != erts_this_dist_entry);
if(dep != erts_this_dist_entry) {
erts_smp_mtx_lock(&erts_dist_table_mtx);
/*
* Another thread might have looked up this dist entry after
* we decided to delete it (refc became zero). If so, the other
* thread incremented refc twice. Once for the new reference
* and once for this thread. Therefore, delete dist entry if
* refc is 0 or -1 after a decrement.
*/
if (erts_refc_dectest(&dep->refc, -1) <= 0)
(void) hash_erase(&erts_dist_table, (void *) dep);
erts_smp_mtx_unlock(&erts_dist_table_mtx);
}
}
void erts_delete_node(ErlNode *enp)
{
ASSERT(enp != erts_this_node);
if(enp != erts_this_node) {
erts_smp_mtx_lock(&erts_node_table_mtx);
/*
* Another thread might have looked up this node after we
* decided to delete it (refc became zero). If so, the other
* thread incremented refc twice. Once for the new reference
* and once for this thread. Therefore, delete node if refc
* is 0 or -1 after a decrement.
*/
if (erts_refc_dectest(&enp->refc, -1) <= 0)
(void) hash_erase(&erts_node_table, (void *) enp);
erts_smp_mtx_unlock(&erts_node_table_mtx);
}
}
ErlNode *erts_find_or_insert_node(Eterm sysname, Uint creation)
{
ErlNode *res;
ErlNode ne;
ne.sysname = sysname;
ne.creation = creation;
erts_smp_mtx_lock(&erts_node_table_mtx);
res = hash_put(&erts_node_table, (void *) &ne);
ASSERT(res);
if (res != erts_this_node) {
long refc = erts_refc_inctest(&res->refc, 0);
if (refc < 2) /* New or pending delete */
erts_refc_inc(&res->refc, 1);
}
erts_smp_mtx_unlock(&erts_node_table_mtx);
return res;
}
