コード例 #1
0
ファイル: erl_message.c プロジェクト: aronisstav/otp
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;
}
コード例 #2
0
ファイル: erl_message.c プロジェクト: aronisstav/otp
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
	    );
    }
}
コード例 #3
0
ファイル: erl_message.c プロジェクト: aronisstav/otp
/* 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;
}
コード例 #4
0
ファイル: erl_message.c プロジェクト: Bufias/otp
/* 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;
}
コード例 #5
0
ファイル: erl_message.c プロジェクト: users-tree/alex
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;
}
コード例 #6
0
ファイル: erl_message.c プロジェクト: users-tree/alex
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
	    );
    }
}
コード例 #7
0
ファイル: erl_message.c プロジェクト: ivenetis/otp-gct
/* 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
}
コード例 #8
0
ファイル: erl_message.c プロジェクト: DavidAlphaFox/my_otp
//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;
}