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erl_message.c
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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1997-2024. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
* Message passing primitives.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "erl_message.h"
#include "erl_process.h"
#include "erl_binary.h"
#include "dtrace-wrapper.h"
#include "beam_bp.h"
#include "erl_proc_sig_queue.h"
ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(message_ref,
ErtsMessageRef,
ERL_MESSAGE_BUF_SZ,
ERTS_ALC_T_MSG_REF)
#if defined(DEBUG) && 0
#define HARD_DEBUG
#else
#undef HARD_DEBUG
#endif
void
init_message(void)
{
init_message_ref_alloc();
}
void *erts_alloc_message_ref(void)
{
return (void *) message_ref_alloc();
}
void erts_free_message_ref(void *mp)
{
message_ref_free((ErtsMessageRef *) mp);
}
/* Allocate message buffer (size in words) */
ErlHeapFragment*
new_message_buffer(Uint size)
{
ErlHeapFragment* bp;
bp = (ErlHeapFragment*) ERTS_HEAP_ALLOC(ERTS_ALC_T_HEAP_FRAG,
ERTS_HEAP_FRAG_SIZE(size));
ERTS_INIT_HEAP_FRAG(bp, size, size);
VERBOSE(DEBUG_SHCOPY, ("[pid=%T] new message buffer %p\n", erts_get_current_pid(), bp->mem));
return bp;
}
ErlHeapFragment*
erts_resize_message_buffer(ErlHeapFragment *bp, Uint size,
Eterm *brefs, Uint brefs_size)
{
#ifdef DEBUG
int i;
#endif
#ifdef HARD_DEBUG
ErlHeapFragment *dbg_bp;
Eterm *dbg_brefs;
Uint dbg_size;
Uint dbg_tot_size;
Eterm *dbg_hp;
#endif
ErlHeapFragment* nbp;
#ifdef DEBUG
{
Uint off_sz = size < bp->used_size ? size : bp->used_size;
for (i = 0; i < brefs_size; i++) {
Eterm *ptr;
if (is_immed(brefs[i]))
continue;
ptr = ptr_val(brefs[i]);
ASSERT(&bp->mem[0] <= ptr && ptr < &bp->mem[0] + off_sz);
}
}
#endif
if (size >= (bp->used_size - bp->used_size / 16)) {
bp->used_size = size;
return bp;
}
#ifdef HARD_DEBUG
dbg_brefs = erts_alloc(ERTS_ALC_T_UNDEF, sizeof(Eterm *)*brefs_size);
dbg_bp = new_message_buffer(bp->used_size);
dbg_hp = dbg_bp->mem;
dbg_tot_size = 0;
for (i = 0; i < brefs_size; i++) {
dbg_size = size_object(brefs[i]);
dbg_tot_size += dbg_size;
dbg_brefs[i] = copy_struct(brefs[i], dbg_size, &dbg_hp,
&dbg_bp->off_heap);
}
ASSERT(dbg_tot_size == (size < bp->used_size ? size : bp->used_size));
#endif
nbp = (ErlHeapFragment*) ERTS_HEAP_REALLOC(ERTS_ALC_T_HEAP_FRAG,
(void *) bp,
ERTS_HEAP_FRAG_SIZE(bp->alloc_size),
ERTS_HEAP_FRAG_SIZE(size));
if (bp != nbp) {
Uint off_sz = size < nbp->used_size ? size : nbp->used_size;
Eterm *sp = &bp->mem[0];
Eterm *ep = sp + off_sz;
Sint offs = &nbp->mem[0] - sp;
erts_offset_off_heap(&nbp->off_heap, offs, sp, ep);
erts_offset_heap(&nbp->mem[0], off_sz, offs, sp, ep);
if (brefs && brefs_size)
erts_offset_heap_ptr(brefs, brefs_size, offs, sp, ep);
#ifdef DEBUG
for (i = 0; i < brefs_size; i++) {
Eterm *ptr;
if (is_immed(brefs[i]))
continue;
ptr = ptr_val(brefs[i]);
ASSERT(&nbp->mem[0] <= ptr && ptr < &nbp->mem[0] + off_sz);
}
#endif
}
nbp->alloc_size = size;
nbp->used_size = size;
#ifdef HARD_DEBUG
for (i = 0; i < brefs_size; i++)
ASSERT(eq(dbg_brefs[i], brefs[i]));
free_message_buffer(dbg_bp);
erts_free(ERTS_ALC_T_UNDEF, dbg_brefs);
#endif
return nbp;
}
void
erts_cleanup_offheap_list(struct erl_off_heap_header* first)
{
union erl_off_heap_ptr u;
for (u.hdr = first; u.hdr; u.hdr = u.hdr->next) {
switch (thing_subtag(u.hdr->thing_word)) {
case BIN_REF_SUBTAG:
erts_bin_release(u.br->val);
break;
case REF_SUBTAG:
ASSERT(is_magic_ref_thing(u.hdr));
erts_bin_release((Binary *)u.mref->mb);
break;
default:
ASSERT(is_external_header(u.hdr->thing_word));
erts_deref_node_entry(u.ext->node, make_boxed(u.ep));
break;
}
}
}
void
erts_cleanup_offheap(ErlOffHeap *offheap)
{
erts_cleanup_offheap_list(offheap->first);
}
void
free_message_buffer(ErlHeapFragment* bp)
{
ASSERT(bp != NULL);
do {
ErlHeapFragment* next_bp = bp->next;
erts_cleanup_offheap(&bp->off_heap);
ERTS_HEAP_FREE(ERTS_ALC_T_HEAP_FRAG, (void *) bp,
ERTS_HEAP_FRAG_SIZE(bp->alloc_size));
bp = next_bp;
}while (bp != NULL);
}
static void
erts_cleanup_message(ErtsMessage *mp)
{
ErlHeapFragment *bp;
if (ERTS_SIG_IS_NON_MSG(mp)) {
erts_proc_sig_cleanup_non_msg_signal(mp);
return;
}
if (ERTS_SIG_IS_EXTERNAL_MSG(mp)) {
ErtsDistExternal *edep = erts_proc_sig_get_external(mp);
if (edep) {
erts_free_dist_ext_copy(edep);
if (mp->data.heap_frag == &mp->hfrag) {
ASSERT(ERTS_SIG_IS_EXTERNAL_MSG(mp));
mp->data.heap_frag = ERTS_MSG_COMBINED_HFRAG;
}
}
}
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);
}
void
erts_cleanup_messages(ErtsMessage *msgp)
{
ErtsMessage *mp = msgp;
while (mp) {
ErtsMessage *fmp;
erts_cleanup_message(mp);
fmp = mp;
mp = mp->next;
erts_free_message(fmp);
}
}
ErtsMessage *
erts_realloc_shrink_message(ErtsMessage *mp, Uint sz, Eterm *brefs, Uint brefs_size)
{
ErtsMessage *nmp = erts_realloc(ERTS_ALC_T_MSG, mp,
sizeof(ErtsMessage) + (sz - 1)*sizeof(Eterm));
if (nmp != mp) {
Eterm *sp = &mp->hfrag.mem[0];
Eterm *ep = sp + sz;
Sint offs = &nmp->hfrag.mem[0] - sp;
erts_offset_off_heap(&nmp->hfrag.off_heap, offs, sp, ep);
erts_offset_heap(&nmp->hfrag.mem[0], sz, offs, sp, ep);
if (brefs && brefs_size)
erts_offset_heap_ptr(brefs, brefs_size, offs, sp, ep);
}
nmp->hfrag.used_size = sz;
nmp->hfrag.alloc_size = sz;
return nmp;
}
void
erts_queue_dist_message(Process *rcvr,
ErtsProcLocks rcvr_locks,
ErtsDistExternal *dist_ext,
ErlHeapFragment *hfrag,
Eterm token,
Eterm from)
{
erts_aint_t state;
ErtsMessage *mp;
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 the sender is known, try to enqueue to an outer signal queue buffer
* instead of directly to the outer signal queue.
*
* Otherwise, the code below flushes the buffer before adding the message
* to ensure the signal order is maintained. This should only happen for
* the relatively uncommon DOP_SEND/DOP_SEND_TT operations. */
if (is_external_pid(from) &&
erts_proc_sig_queue_try_enqueue_to_buffer(from, rcvr, rcvr_locks,
mp, &mp->next,
NULL, 1)) {
return;
}
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ)) {
ErtsProcLocks unlocks;
unlocks = rcvr_locks & ERTS_PROC_LOCKS_HIGHER_THAN(ERTS_PROC_LOCK_MSGQ);
erts_proc_unlock(rcvr, unlocks);
erts_proc_sig_queue_lock(rcvr);
}
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 {
if (state & ERTS_PSFLG_OFF_HEAP_MSGQ) {
/* Install buffers for the outer message if the heuristic
* indicates that this is beneficial. It is best to do this as
* soon as possible to avoid as much contention as possible. */
erts_proc_sig_queue_maybe_install_buffers(rcvr, state);
/* Flush outer signal queue buffers, if such buffers are
* installed, to ensure that messages from the same
* process cannot be reordered. */
erts_proc_sig_queue_flush_buffers(rcvr);
}
LINK_MESSAGE(rcvr, mp, state);
if (!(rcvr_locks & ERTS_PROC_LOCK_MSGQ)) {
erts_proc_unlock(rcvr, ERTS_PROC_LOCK_MSGQ);
}
erts_proc_notify_new_message(rcvr, rcvr_locks);
}
}
/* Add messages last in message queue */
static void
queue_messages(Eterm from,
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));
/*
* Try to enqueue to an outer signal queue buffer instead of
* directly to the outer signal queue
*/
if (erts_proc_sig_queue_try_enqueue_to_buffer(from, receiver, receiver_locks,
first, last, NULL, len)) {
return;
}
if (!(receiver_locks & ERTS_PROC_LOCK_MSGQ)) {
erts_proc_sig_queue_lock(receiver);
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;
}
/*
* Install buffers for the outer message if the heuristic
* indicates that this is beneficial. It is best to do this as
* soon as possible to avoid as much contention as possible.
*/
erts_proc_sig_queue_maybe_install_buffers(receiver, state);
if (last == &first->next) {
ASSERT(len == 1);
if (state & ERTS_PSFLG_OFF_HEAP_MSGQ) {
/*
* Flush outer signal queue buffers, if such buffers are
* installed, to ensure that messages from the same
* process cannot be reordered.
*/
erts_proc_sig_queue_flush_buffers(receiver);
}
LINK_MESSAGE(receiver, first, state);
}
else {
state = erts_enqueue_signals(receiver, first, last, len, state);
}
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);
}
static ERTS_INLINE
ErtsMessage* prepend_pending_sig_maybe(Process* sender, Process* receiver,
ErtsMessage* mp)
{
ErtsSchedulerData* esdp = sender->scheduler_data;
ErtsSignal* pend_sig;
if (!esdp || esdp->pending_signal.to != receiver->common.id)
return mp;
pend_sig = esdp->pending_signal.sig;
ASSERT(esdp->pending_signal.dbg_from == sender);
esdp->pending_signal.sig = NULL;
esdp->pending_signal.to = THE_NON_VALUE;
pend_sig->common.next = mp;
pend_sig->common.specific.next = NULL;
return (ErtsMessage*) pend_sig;
}
/**
*
* @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(from, receiver, receiver_locks, mp, &mp->next, 1);
}
/**
*
* @brief Send one message from *NOT* a local process.
*
* But with a token!
*/
void
erts_queue_message_token(Process* receiver, ErtsProcLocks receiver_locks,
ErtsMessage* mp, Eterm msg, Eterm from, Eterm token)
{
ASSERT(is_not_internal_pid(from));
ERL_MESSAGE_TERM(mp) = msg;
ERL_MESSAGE_FROM(mp) = from;
ERL_MESSAGE_TOKEN(mp) = token;
queue_messages(from, receiver, receiver_locks, mp, &mp->next, 1);
}
/**
* @brief Send one message from a local process.
*
* It is up to the caller of this function to set the
* correct seq_trace. The general rule of thumb is that
* it should be set to am_undefined if the message
* cannot be traced using seq_trace, if it can be
* traced it should be set to the trace token. It should
* very rarely be explicitly set to NIL!
*/
void
erts_queue_proc_message(Process* sender,
Process* receiver, ErtsProcLocks receiver_locks,
ErtsMessage* mp, Eterm msg)
{
if (sender == receiver)
(void) erts_atomic32_read_bor_nob(&sender->xstate,
ERTS_PXSFLG_MAYBE_SELF_SIGS);
ERL_MESSAGE_TERM(mp) = msg;
ERL_MESSAGE_FROM(mp) = sender->common.id;
queue_messages(sender->common.id, receiver, receiver_locks,
prepend_pending_sig_maybe(sender, receiver, mp),
&mp->next, 1);
}
void
erts_queue_proc_messages(Process* sender,
Process* receiver, ErtsProcLocks receiver_locks,
ErtsMessage* first, ErtsMessage** last, Uint len)
{
if (sender == receiver)
(void) erts_atomic32_read_bor_nob(&sender->xstate,
ERTS_PXSFLG_MAYBE_SELF_SIGS);
queue_messages(sender->common.id, receiver, receiver_locks,
prepend_pending_sig_maybe(sender, receiver, first),
last, len);
}
void
erts_link_mbuf_to_proc(Process *proc, ErlHeapFragment *first_bp)
{
if (first_bp) {
ErlHeapFragment *bp = first_bp;
while (1) {
/* Move any off_heap's into the process */
if (bp->off_heap.first != NULL) {
struct erl_off_heap_header** next_p = &bp->off_heap.first;
while (*next_p != NULL) {
next_p = &((*next_p)->next);
}
*next_p = MSO(proc).first;
MSO(proc).first = bp->off_heap.first;
bp->off_heap.first = NULL;
OH_OVERHEAD(&(MSO(proc)), bp->off_heap.overhead);
}
MBUF_SIZE(proc) += bp->used_size;
if (!bp->next)
break;
bp = bp->next;
}
/* Link the message buffer */
bp->next = MBUF(proc);
MBUF(proc) = first_bp;
}
}
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, 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;
}
ErtsMessage *
erts_try_alloc_message_on_heap(Process *pp,
erts_aint32_t *psp,
ErtsProcLocks *plp,
Uint sz,
Eterm **hpp,
ErlOffHeap **ohpp,
int *on_heap_p)
{
int locked_main = 0;
ErtsMessage *mp;
ASSERT(!(*psp & ERTS_PSFLG_OFF_HEAP_MSGQ));
if ((*psp) & ERTS_PSFLGS_VOLATILE_HEAP)
goto in_message_fragment;
else if (*plp & ERTS_PROC_LOCK_MAIN) {
try_on_heap:
if (((*psp) & ERTS_PSFLGS_VOLATILE_HEAP)
|| (pp->flags & F_DISABLE_GC)
|| HEAP_LIMIT(pp) - HEAP_TOP(pp) <= sz) {
/*
* The heap is either potentially in an inconsistent
* state, or not large enough.
*/
if (locked_main) {
*plp &= ~ERTS_PROC_LOCK_MAIN;
erts_proc_unlock(pp, ERTS_PROC_LOCK_MAIN);
}
goto in_message_fragment;
}
*hpp = HEAP_TOP(pp);
HEAP_TOP(pp) = *hpp + sz;
*ohpp = &MSO(pp);
mp = erts_alloc_message(0, NULL);
mp->data.attached = NULL;
*on_heap_p = !0;
erts_adjust_memory_break(pp, -sz);
}
else if (pp && erts_proc_trylock(pp, ERTS_PROC_LOCK_MAIN) == 0) {
locked_main = 1;
*psp = erts_atomic32_read_nob(&pp->state);
*plp |= ERTS_PROC_LOCK_MAIN;
goto try_on_heap;
}
else {
in_message_fragment:
if ((*psp) & ERTS_PSFLG_OFF_HEAP_MSGQ) {
mp = erts_alloc_message(sz, hpp);
*ohpp = sz == 0 ? NULL : &mp->hfrag.off_heap;
}
else {
mp = erts_alloc_message(0, NULL);
if (!sz) {
*hpp = NULL;
*ohpp = NULL;
}
else {
ErlHeapFragment *bp;
bp = new_message_buffer(sz);
*hpp = &bp->mem[0];
mp->data.heap_frag = bp;
*ohpp = &bp->off_heap;
}
}
*on_heap_p = 0;
}
return mp;
}
/*
* Send a local message when sender & receiver processes are known.
*/
void
erts_send_message(Process* sender,
Process* receiver,
ErtsProcLocks *receiver_locks,
Eterm message)
{
Uint msize;
ErtsMessage* mp;
ErlOffHeap *ohp;
Eterm token = NIL;
#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 ERTS_ENABLE_LOCK_CHECK
int have_receiver_main_lock = 0;
#endif
#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) {
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_serial(sender);
seq_trace_output(stoken, message, SEQ_TRACE_SEND,
receiver->common.id, sender);
seq_trace_size = size_object(stoken);
}
#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 ERTS_ENABLE_LOCK_CHECK
if ((*receiver_locks) & ERTS_PROC_LOCK_MAIN) {
have_receiver_main_lock = 1;
erts_proc_lc_require_lock(receiver, ERTS_PROC_LOCK_MAIN,
__FILE__, __LINE__);
}
#endif
#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 = SEQ_TRACE_T_DTRACE_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;
#ifdef ERTS_ENABLE_LOCK_CHECK
ASSERT((*receiver_locks) & ERTS_PROC_LOCK_MAIN);
have_receiver_main_lock = 1;
erts_proc_lc_require_lock(receiver, ERTS_PROC_LOCK_MAIN,
__FILE__, __LINE__);
#endif
}
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 ERTS_ENABLE_LOCK_CHECK
if ((*receiver_locks) & ERTS_PROC_LOCK_MAIN) {
have_receiver_main_lock = 1;
erts_proc_lc_require_lock(receiver, ERTS_PROC_LOCK_MAIN,
__FILE__, __LINE__);
}
#endif
#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
erts_queue_proc_message(sender, receiver, *receiver_locks, mp, message);
#ifdef ERTS_ENABLE_LOCK_CHECK
if (have_receiver_main_lock)
erts_proc_lc_unrequire_lock(receiver, ERTS_PROC_LOCK_MAIN);
#endif
if (msize > ERTS_MSG_COPY_WORDS_PER_REDUCTION) {
Uint reds = msize / ERTS_MSG_COPY_WORDS_PER_REDUCTION;
if (reds > CONTEXT_REDS)
reds = CONTEXT_REDS;
BUMP_REDS(sender, (int) reds);
}
}
/*
* This function delivers an EXIT message to a process
* which is trapping EXITs.
*/
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);
}
}
void erts_save_message_in_proc(Process *p, ErtsMessage *msgp)
{
ErlHeapFragment *hfp;
if (msgp->data.attached == ERTS_MSG_COMBINED_HFRAG)
hfp = &msgp->hfrag;
else if (msgp->data.attached) {
hfp = msgp->data.heap_frag;
}
else {
erts_adjust_message_break(p, ERL_MESSAGE_TERM(msgp));
erts_free_message(msgp);
return; /* Nothing to save */
}
while (1) {
struct erl_off_heap_header *ohhp = hfp->off_heap.first;
if (ohhp) {
for ( ; ohhp->next; ohhp = ohhp->next)
;
ohhp->next = p->off_heap.first;
p->off_heap.first = hfp->off_heap.first;
hfp->off_heap.first = NULL;
}
p->off_heap.overhead += hfp->off_heap.overhead;
hfp->off_heap.overhead = 0;
p->mbuf_sz += hfp->used_size;
if (!hfp->next)
break;
hfp = hfp->next;
}
msgp->next = p->msg_frag;
p->msg_frag = msgp;
}
typedef struct {