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dist.c
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dist.c
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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2014. 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%
*/
/*
* distribution of erlang messages to other nodes.
*/
/* define this to get a lot of debug output */
/* #define ERTS_DIST_MSG_DBG */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#define ERTS_WANT_EXTERNAL_TAGS
#include <stddef.h>
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "erl_process.h"
#include "error.h"
#include "dist.h"
#include "bif.h"
#include "external.h"
#include "erl_binary.h"
#include "erl_thr_progress.h"
#include "dtrace-wrapper.h"
#define DIST_CTL_DEFAULT_SIZE 64
/* Turn this on to get printouts of all distribution messages
* which go on the line
*/
#if 0
#define ERTS_DIST_MSG_DBG
#endif
#if 0
#define ERTS_RAW_DIST_MSG_DBG
#endif
#if defined(ERTS_DIST_MSG_DBG) || defined(ERTS_RAW_DIST_MSG_DBG)
static void bw(byte *buf, ErlDrvSizeT sz)
{
bin_write(ERTS_PRINT_STDERR, NULL, buf, sz);
}
#endif
#ifdef ERTS_DIST_MSG_DBG
static void
dist_msg_dbg(ErtsDistExternal *edep, char *what, byte *buf, int sz)
{
ErtsHeapFactory factory;
DeclareTmpHeapNoproc(ctl_default,DIST_CTL_DEFAULT_SIZE);
Eterm* ctl = ctl_default;
byte *extp = edep->extp;
Eterm msg;
Sint ctl_len;
Sint size = ctl_len = erts_decode_dist_ext_size(edep);
if (size < 0) {
erts_fprintf(stderr,
"DIST MSG DEBUG: erts_decode_dist_ext_size(%s) failed:\n",
what);
bw(buf, sz);
}
else {
ErlHeapFragment *mbuf = new_message_buffer(size);
erts_factory_static_init(&factory, ctl, ctl_len, &mbuf->off_heap);
msg = erts_decode_dist_ext(&factory, edep);
if (is_value(msg))
erts_fprintf(stderr, " %s: %T\n", what, msg);
else {
erts_fprintf(stderr,
"DIST MSG DEBUG: erts_decode_dist_ext(%s) failed:\n",
what);
bw(buf, sz);
}
free_message_buffer(mbuf);
edep->extp = extp;
}
}
#endif
#define PASS_THROUGH 'p' /* This code should go */
int erts_is_alive; /* System must be blocked on change */
int erts_dist_buf_busy_limit;
/* distribution trap functions */
Export* dsend2_trap = NULL;
Export* dsend3_trap = NULL;
/*Export* dsend_nosuspend_trap = NULL;*/
Export* dlink_trap = NULL;
Export* dunlink_trap = NULL;
Export* dmonitor_node_trap = NULL;
Export* dgroup_leader_trap = NULL;
Export* dexit_trap = NULL;
Export* dmonitor_p_trap = NULL;
/* local variables */
/* forward declarations */
static void clear_dist_entry(DistEntry*);
static int dsig_send_ctl(ErtsDSigData* dsdp, Eterm ctl, int force_busy);
static void send_nodes_mon_msgs(Process *, Eterm, Eterm, Eterm, Eterm);
static void init_nodes_monitors(void);
static erts_smp_atomic_t no_caches;
static erts_smp_atomic_t no_nodes;
struct {
Eterm reason;
ErlHeapFragment *bp;
} nodedown;
static void
delete_cache(ErtsAtomCache *cache)
{
if (cache) {
erts_free(ERTS_ALC_T_DCACHE, (void *) cache);
ASSERT(erts_smp_atomic_read_nob(&no_caches) > 0);
erts_smp_atomic_dec_nob(&no_caches);
}
}
static void
create_cache(DistEntry *dep)
{
int i;
ErtsAtomCache *cp;
ERTS_SMP_LC_ASSERT(
is_internal_port(dep->cid)
&& erts_lc_is_port_locked(erts_port_lookup_raw(dep->cid)));
ASSERT(!dep->cache);
dep->cache = cp = (ErtsAtomCache*) erts_alloc(ERTS_ALC_T_DCACHE,
sizeof(ErtsAtomCache));
erts_smp_atomic_inc_nob(&no_caches);
for (i = 0; i < sizeof(cp->in_arr)/sizeof(cp->in_arr[0]); i++) {
cp->in_arr[i] = THE_NON_VALUE;
cp->out_arr[i] = THE_NON_VALUE;
}
}
Uint erts_dist_cache_size(void)
{
return (Uint) erts_smp_atomic_read_mb(&no_caches)*sizeof(ErtsAtomCache);
}
static ErtsProcList *
get_suspended_on_de(DistEntry *dep, Uint32 unset_qflgs)
{
ERTS_SMP_LC_ASSERT(erts_smp_lc_mtx_is_locked(&dep->qlock));
dep->qflgs &= ~unset_qflgs;
if (dep->qflgs & ERTS_DE_QFLG_EXIT) {
/* No resume when exit has been scheduled */
return NULL;
}
else {
ErtsProcList *suspended = dep->suspended;
dep->suspended = NULL;
erts_proclist_fetch(&suspended, NULL);
return suspended;
}
}
/*
** A full node name constists of a "n@h"
**
** n must be a valid node name: string of ([a-z][A-Z][0-9]_-)+
**
** h is not checked at all, we assume that we have a properly
** configured machine where the networking is ok for the OS
**
** We do check that there is not a second @ in the string, since
** many distributed operations are guaranteed not to work then.
*/
static int is_node_name(char *ptr, int len)
{
int c = '\0'; /* suppress use-before-set warning */
int pos = 0;
while (pos < len) {
c = ptr[pos++];
if (! ((c == '-') || (c == '_') ||
((c >= 'a') && (c <= 'z')) ||
((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9'))))
break;
}
/* Scanned past the host name: now we want to see a '@', and there
should be text both before and after it. */
if (c != '@' || pos < 2 || pos == len)
return 0;
while (pos < len) {
c = ptr[pos++];
if (c == '@')
return 0;
}
return 1;
}
int is_node_name_atom(Eterm a)
{
int i;
if(is_not_atom(a))
return 0;
i = atom_val(a);
ASSERT((i > 0) && (i < atom_table_size()) && (atom_tab(i) != NULL));
return is_node_name((char*)atom_tab(i)->name, atom_tab(i)->len);
}
typedef struct {
DistEntry *dep;
Eterm *lhp;
} NetExitsContext;
/*
** This function is called when a distribution
** port or process terminates
*/
static void doit_monitor_net_exits(ErtsMonitor *mon, void *vnecp)
{
Process *rp;
ErtsMonitor *rmon;
DistEntry *dep = ((NetExitsContext *) vnecp)->dep;
ErtsProcLocks rp_locks = ERTS_PROC_LOCK_LINK;
rp = erts_pid2proc(NULL, 0, mon->pid, rp_locks);
if (!rp)
goto done;
if (mon->type == MON_ORIGIN) {
/* local pid is beeing monitored */
rmon = erts_remove_monitor(&ERTS_P_MONITORS(rp), mon->ref);
/* ASSERT(rmon != NULL); nope, can happen during process exit */
if (rmon != NULL) {
erts_destroy_monitor(rmon);
}
} else {
DeclareTmpHeapNoproc(lhp,3);
Eterm watched;
UseTmpHeapNoproc(3);
ASSERT(mon->type == MON_TARGET);
rmon = erts_remove_monitor(&ERTS_P_MONITORS(rp), mon->ref);
/* ASSERT(rmon != NULL); can happen during process exit */
if (rmon != NULL) {
ASSERT(is_atom(rmon->name) || is_nil(rmon->name));
watched = (is_atom(rmon->name)
? TUPLE2(lhp, rmon->name, dep->sysname)
: rmon->pid);
#ifdef ERTS_SMP
rp_locks |= ERTS_PROC_LOCKS_MSG_SEND;
erts_smp_proc_lock(rp, ERTS_PROC_LOCKS_MSG_SEND);
#endif
erts_queue_monitor_message(rp, &rp_locks, mon->ref, am_process,
watched, am_noconnection);
erts_destroy_monitor(rmon);
}
UnUseTmpHeapNoproc(3);
}
erts_smp_proc_unlock(rp, rp_locks);
done:
erts_destroy_monitor(mon);
}
typedef struct {
NetExitsContext *necp;
ErtsLink *lnk;
} LinkNetExitsContext;
/*
** This is the function actually doing the job of sending exit messages
** for links in a dist entry upon net_exit (the node goes down), NB,
** only process links, not node monitors are handled here,
** they reside in a separate tree....
*/
static void doit_link_net_exits_sub(ErtsLink *sublnk, void *vlnecp)
{
ErtsLink *lnk = ((LinkNetExitsContext *) vlnecp)->lnk; /* the local pid */
ErtsLink *rlnk;
Process *rp;
ASSERT(lnk->type == LINK_PID);
if (is_internal_pid(lnk->pid)) {
int xres;
ErtsProcLocks rp_locks = ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCKS_XSIG_SEND;
rp = erts_pid2proc(NULL, 0, lnk->pid, rp_locks);
if (!rp) {
goto done;
}
rlnk = erts_remove_link(&ERTS_P_LINKS(rp), sublnk->pid);
xres = erts_send_exit_signal(NULL,
sublnk->pid,
rp,
&rp_locks,
am_noconnection,
NIL,
NULL,
0);
if (rlnk) {
erts_destroy_link(rlnk);
if (xres >= 0 && IS_TRACED_FL(rp, F_TRACE_PROCS)) {
/* We didn't exit the process and it is traced */
trace_proc(NULL, rp, am_getting_unlinked, sublnk->pid);
}
}
erts_smp_proc_unlock(rp, rp_locks);
}
done:
erts_destroy_link(sublnk);
}
/*
** This function is called when a distribution
** port or process terminates, once for each link on the high level,
** it in turn traverses the link subtree for the specific link node...
*/
static void doit_link_net_exits(ErtsLink *lnk, void *vnecp)
{
LinkNetExitsContext lnec = {(NetExitsContext *) vnecp, lnk};
ASSERT(lnk->type == LINK_PID);
erts_sweep_links(ERTS_LINK_ROOT(lnk), &doit_link_net_exits_sub, (void *) &lnec);
#ifdef DEBUG
ERTS_LINK_ROOT(lnk) = NULL;
#endif
erts_destroy_link(lnk);
}
static void doit_node_link_net_exits(ErtsLink *lnk, void *vnecp)
{
DistEntry *dep = ((NetExitsContext *) vnecp)->dep;
Eterm name = dep->sysname;
Process *rp;
ErtsLink *rlnk;
Uint i,n;
ASSERT(lnk->type == LINK_NODE);
if (is_internal_pid(lnk->pid)) {
ErtsProcLocks rp_locks = ERTS_PROC_LOCK_LINK;
rp = erts_pid2proc(NULL, 0, lnk->pid, rp_locks);
if (!rp) {
goto done;
}
rlnk = erts_remove_link(&ERTS_P_LINKS(rp), name);
if (rlnk != NULL) {
ASSERT(is_atom(rlnk->pid) && (rlnk->type == LINK_NODE));
erts_destroy_link(rlnk);
}
n = ERTS_LINK_REFC(lnk);
for (i = 0; i < n; ++i) {
ErlHeapFragment* bp;
ErlOffHeap *ohp;
Eterm tup;
Eterm *hp = erts_alloc_message_heap(3,&bp,&ohp,rp,&rp_locks);
tup = TUPLE2(hp, am_nodedown, name);
erts_queue_message(rp, &rp_locks, bp, tup, NIL);
}
erts_smp_proc_unlock(rp, rp_locks);
}
done:
erts_destroy_link(lnk);
}
static void
set_node_not_alive(void *unused)
{
ErlHeapFragment *bp;
Eterm nodename = erts_this_dist_entry->sysname;
ASSERT(erts_smp_atomic_read_nob(&no_nodes) == 0);
erts_smp_thr_progress_block();
erts_set_this_node(am_Noname, 0);
erts_is_alive = 0;
send_nodes_mon_msgs(NULL, am_nodedown, nodename, am_visible, nodedown.reason);
nodedown.reason = NIL;
bp = nodedown.bp;
nodedown.bp = NULL;
erts_smp_thr_progress_unblock();
if (bp)
free_message_buffer(bp);
}
static ERTS_INLINE void
dec_no_nodes(void)
{
erts_aint_t no = erts_smp_atomic_dec_read_mb(&no_nodes);
ASSERT(no >= 0);
ASSERT(erts_get_scheduler_id()); /* Need to be a scheduler */
if (no == 0)
erts_schedule_misc_aux_work(erts_get_scheduler_id(),
set_node_not_alive,
NULL);
}
static ERTS_INLINE void
inc_no_nodes(void)
{
#ifdef DEBUG
erts_aint_t no = erts_smp_atomic_read_nob(&no_nodes);
ASSERT(erts_is_alive ? no > 0 : no == 0);
#endif
erts_smp_atomic_inc_mb(&no_nodes);
}
/*
* proc is currently running or exiting process.
*/
int erts_do_net_exits(DistEntry *dep, Eterm reason)
{
Eterm nodename;
if (dep == erts_this_dist_entry) { /* Net kernel has died (clean up!!) */
DistEntry *tdep;
int no_dist_port = 0;
Eterm nd_reason = (reason == am_no_network
? am_no_network
: am_net_kernel_terminated);
erts_smp_rwmtx_rlock(&erts_dist_table_rwmtx);
for (tdep = erts_hidden_dist_entries; tdep; tdep = tdep->next)
no_dist_port++;
for (tdep = erts_visible_dist_entries; tdep; tdep = tdep->next)
no_dist_port++;
/* KILL all port controllers */
if (no_dist_port == 0)
erts_smp_rwmtx_runlock(&erts_dist_table_rwmtx);
else {
Eterm def_buf[128];
int i = 0;
Eterm *dist_port;
if (no_dist_port <= sizeof(def_buf)/sizeof(def_buf[0]))
dist_port = &def_buf[0];
else
dist_port = erts_alloc(ERTS_ALC_T_TMP,
sizeof(Eterm)*no_dist_port);
for (tdep = erts_hidden_dist_entries; tdep; tdep = tdep->next) {
ASSERT(is_internal_port(tdep->cid));
dist_port[i++] = tdep->cid;
}
for (tdep = erts_visible_dist_entries; tdep; tdep = tdep->next) {
ASSERT(is_internal_port(tdep->cid));
dist_port[i++] = tdep->cid;
}
erts_smp_rwmtx_runlock(&erts_dist_table_rwmtx);
for (i = 0; i < no_dist_port; i++) {
Port *prt = erts_port_lookup(dist_port[i],
ERTS_PORT_SFLGS_INVALID_LOOKUP);
if (!prt)
continue;
ASSERT(erts_atomic32_read_nob(&prt->state)
& ERTS_PORT_SFLG_DISTRIBUTION);
erts_port_exit(NULL, ERTS_PORT_SIG_FLG_FORCE_SCHED,
prt, dist_port[i], nd_reason, NULL);
}
if (dist_port != &def_buf[0])
erts_free(ERTS_ALC_T_TMP, dist_port);
}
/*
* When last dist port exits, node will be taken
* from alive to not alive.
*/
ASSERT(is_nil(nodedown.reason) && !nodedown.bp);
if (is_immed(nd_reason))
nodedown.reason = nd_reason;
else {
Eterm *hp;
Uint sz = size_object(nd_reason);
nodedown.bp = new_message_buffer(sz);
hp = nodedown.bp->mem;
nodedown.reason = copy_struct(nd_reason,
sz,
&hp,
&nodedown.bp->off_heap);
}
}
else { /* Call from distribution port */
NetExitsContext nec = {dep};
ErtsLink *nlinks;
ErtsLink *node_links;
ErtsMonitor *monitors;
Uint32 flags;
erts_smp_atomic_set_mb(&dep->dist_cmd_scheduled, 1);
erts_smp_de_rwlock(dep);
ERTS_SMP_LC_ASSERT(is_internal_port(dep->cid)
&& erts_lc_is_port_locked(erts_port_lookup_raw(dep->cid)));
if (erts_port_task_is_scheduled(&dep->dist_cmd))
erts_port_task_abort(&dep->dist_cmd);
if (dep->status & ERTS_DE_SFLG_EXITING) {
#ifdef DEBUG
erts_smp_mtx_lock(&dep->qlock);
ASSERT(dep->qflgs & ERTS_DE_QFLG_EXIT);
erts_smp_mtx_unlock(&dep->qlock);
#endif
}
else {
dep->status |= ERTS_DE_SFLG_EXITING;
erts_smp_mtx_lock(&dep->qlock);
ASSERT(!(dep->qflgs & ERTS_DE_QFLG_EXIT));
dep->qflgs |= ERTS_DE_QFLG_EXIT;
erts_smp_mtx_unlock(&dep->qlock);
}
erts_smp_de_links_lock(dep);
monitors = dep->monitors;
nlinks = dep->nlinks;
node_links = dep->node_links;
dep->monitors = NULL;
dep->nlinks = NULL;
dep->node_links = NULL;
erts_smp_de_links_unlock(dep);
nodename = dep->sysname;
flags = dep->flags;
erts_set_dist_entry_not_connected(dep);
erts_smp_de_rwunlock(dep);
erts_sweep_monitors(monitors, &doit_monitor_net_exits, (void *) &nec);
erts_sweep_links(nlinks, &doit_link_net_exits, (void *) &nec);
erts_sweep_links(node_links, &doit_node_link_net_exits, (void *) &nec);
send_nodes_mon_msgs(NULL,
am_nodedown,
nodename,
flags & DFLAG_PUBLISHED ? am_visible : am_hidden,
reason == am_normal ? am_connection_closed : reason);
clear_dist_entry(dep);
}
dec_no_nodes();
return 1;
}
static Export*
trap_function(Eterm func, int arity)
{
return erts_export_put(am_erlang, func, arity);
}
void init_dist(void)
{
init_nodes_monitors();
nodedown.reason = NIL;
nodedown.bp = NULL;
erts_smp_atomic_init_nob(&no_nodes, 0);
erts_smp_atomic_init_nob(&no_caches, 0);
/* Lookup/Install all references to trap functions */
dsend2_trap = trap_function(am_dsend,2);
dsend3_trap = trap_function(am_dsend,3);
/* dsend_nosuspend_trap = trap_function(am_dsend_nosuspend,2);*/
dlink_trap = trap_function(am_dlink,1);
dunlink_trap = trap_function(am_dunlink,1);
dmonitor_node_trap = trap_function(am_dmonitor_node,3);
dgroup_leader_trap = trap_function(am_dgroup_leader,2);
dexit_trap = trap_function(am_dexit, 2);
dmonitor_p_trap = trap_function(am_dmonitor_p, 2);
}
#define ErtsDistOutputBuf2Binary(OB) \
((Binary *) (((char *) (OB)) - offsetof(Binary, orig_bytes)))
static ERTS_INLINE ErtsDistOutputBuf *
alloc_dist_obuf(Uint size)
{
ErtsDistOutputBuf *obuf;
Uint obuf_size = sizeof(ErtsDistOutputBuf)+sizeof(byte)*(size-1);
Binary *bin = erts_bin_drv_alloc(obuf_size);
erts_refc_init(&bin->refc, 1);
obuf = (ErtsDistOutputBuf *) &bin->orig_bytes[0];
#ifdef DEBUG
obuf->dbg_pattern = ERTS_DIST_OUTPUT_BUF_DBG_PATTERN;
ASSERT(bin == ErtsDistOutputBuf2Binary(obuf));
#endif
return obuf;
}
static ERTS_INLINE void
free_dist_obuf(ErtsDistOutputBuf *obuf)
{
Binary *bin = ErtsDistOutputBuf2Binary(obuf);
ASSERT(obuf->dbg_pattern == ERTS_DIST_OUTPUT_BUF_DBG_PATTERN);
if (erts_refc_dectest(&bin->refc, 0) == 0)
erts_bin_free(bin);
}
static ERTS_INLINE Sint
size_obuf(ErtsDistOutputBuf *obuf)
{
Binary *bin = ErtsDistOutputBuf2Binary(obuf);
return bin->orig_size;
}
static void clear_dist_entry(DistEntry *dep)
{
Sint obufsize = 0;
ErtsAtomCache *cache;
ErtsProcList *suspendees;
ErtsDistOutputBuf *obuf;
erts_smp_de_rwlock(dep);
cache = dep->cache;
dep->cache = NULL;
#ifdef DEBUG
erts_smp_de_links_lock(dep);
ASSERT(!dep->nlinks);
ASSERT(!dep->node_links);
ASSERT(!dep->monitors);
erts_smp_de_links_unlock(dep);
#endif
erts_smp_mtx_lock(&dep->qlock);
if (!dep->out_queue.last)
obuf = dep->finalized_out_queue.first;
else {
dep->out_queue.last->next = dep->finalized_out_queue.first;
obuf = dep->out_queue.first;
}
dep->out_queue.first = NULL;
dep->out_queue.last = NULL;
dep->finalized_out_queue.first = NULL;
dep->finalized_out_queue.last = NULL;
dep->status = 0;
suspendees = get_suspended_on_de(dep, ERTS_DE_QFLGS_ALL);
erts_smp_mtx_unlock(&dep->qlock);
erts_smp_atomic_set_nob(&dep->dist_cmd_scheduled, 0);
dep->send = NULL;
erts_smp_de_rwunlock(dep);
erts_resume_processes(suspendees);
delete_cache(cache);
while (obuf) {
ErtsDistOutputBuf *fobuf;
fobuf = obuf;
obuf = obuf->next;
obufsize += size_obuf(fobuf);
free_dist_obuf(fobuf);
}
if (obufsize) {
erts_smp_mtx_lock(&dep->qlock);
ASSERT(dep->qsize >= obufsize);
dep->qsize -= obufsize;
erts_smp_mtx_unlock(&dep->qlock);
}
}
void erts_dsend_context_dtor(Binary* ctx_bin)
{
ErtsSendContext* ctx = ERTS_MAGIC_BIN_DATA(ctx_bin);
switch (ctx->dss.phase) {
case ERTS_DSIG_SEND_PHASE_MSG_SIZE:
DESTROY_SAVED_WSTACK(&ctx->dss.u.sc.wstack);
break;
case ERTS_DSIG_SEND_PHASE_MSG_ENCODE:
DESTROY_SAVED_WSTACK(&ctx->dss.u.ec.wstack);
break;
default:;
}
if (ctx->dss.phase >= ERTS_DSIG_SEND_PHASE_ALLOC && ctx->dss.obuf) {
free_dist_obuf(ctx->dss.obuf);
}
if (ctx->dep_to_deref)
erts_deref_dist_entry(ctx->dep_to_deref);
}
Eterm erts_dsend_export_trap_context(Process* p, ErtsSendContext* ctx)
{
struct exported_ctx {
ErtsSendContext ctx;
ErtsAtomCacheMap acm;
};
Binary* ctx_bin = erts_create_magic_binary(sizeof(struct exported_ctx),
erts_dsend_context_dtor);
struct exported_ctx* dst = ERTS_MAGIC_BIN_DATA(ctx_bin);
Uint ctl_size = !HALFWORD_HEAP ? 0 : (arityval(ctx->ctl_heap[0]) + 1);
Eterm* hp = HAlloc(p, ctl_size + PROC_BIN_SIZE);
sys_memcpy(&dst->ctx, ctx, sizeof(ErtsSendContext));
ASSERT(ctx->dss.ctl == make_tuple(ctx->ctl_heap));
#if !HALFWORD_HEAP
dst->ctx.dss.ctl = make_tuple(dst->ctx.ctl_heap);
#else
/* Must put control tuple in low mem */
sys_memcpy(hp, ctx->ctl_heap, ctl_size*sizeof(Eterm));
dst->ctx.dss.ctl = make_tuple(hp);
hp += ctl_size;
#endif
if (ctx->dss.acmp) {
sys_memcpy(&dst->acm, ctx->dss.acmp, sizeof(ErtsAtomCacheMap));
dst->ctx.dss.acmp = &dst->acm;
}
return erts_mk_magic_binary_term(&hp, &MSO(p), ctx_bin);
}
/*
* The erts_dsig_send_*() functions implemented below, sends asynchronous
* distributed signals to other Erlang nodes. Before sending a distributed
* signal, you need to prepare the operation by calling erts_dsig_prepare()
* (see dist.h).
*
* Note that the distributed signal send operation is truly asynchronous,
* and the signal is not guaranteed to reach the receiver if the connection
* goes down before the signal has reached the receiver.
*/
/*
** Send a DOP_LINK link message
*/
int
erts_dsig_send_link(ErtsDSigData *dsdp, Eterm local, Eterm remote)
{
DeclareTmpHeapNoproc(ctl_heap,4);
Eterm ctl = TUPLE3(&ctl_heap[0], make_small(DOP_LINK), local, remote);
int res;
UseTmpHeapNoproc(4);
res = dsig_send_ctl(dsdp, ctl, 0);
UnUseTmpHeapNoproc(4);
return res;
}
int
erts_dsig_send_unlink(ErtsDSigData *dsdp, Eterm local, Eterm remote)
{
DeclareTmpHeapNoproc(ctl_heap,4);
Eterm ctl = TUPLE3(&ctl_heap[0], make_small(DOP_UNLINK), local, remote);
int res;
UseTmpHeapNoproc(4);
res = dsig_send_ctl(dsdp, ctl, 0);
UnUseTmpHeapNoproc(4);
return res;
}
/* A local process that's beeing monitored by a remote one exits. We send:
{DOP_MONITOR_P_EXIT, Local pid or name, Remote pid, ref, reason},
which is rather sad as only the ref is needed, no pid's... */
int
erts_dsig_send_m_exit(ErtsDSigData *dsdp, Eterm watcher, Eterm watched,
Eterm ref, Eterm reason)
{
Eterm ctl;
DeclareTmpHeapNoproc(ctl_heap,6);
int res;
UseTmpHeapNoproc(6);
ctl = TUPLE5(&ctl_heap[0], make_small(DOP_MONITOR_P_EXIT),
watched, watcher, ref, reason);
#ifdef DEBUG
erts_smp_de_links_lock(dsdp->dep);
ASSERT(!erts_lookup_monitor(dsdp->dep->monitors, ref));
erts_smp_de_links_unlock(dsdp->dep);
#endif
res = dsig_send_ctl(dsdp, ctl, 1);
UnUseTmpHeapNoproc(6);
return res;
}
/* We want to monitor a process (named or unnamed) on another node, we send:
{DOP_MONITOR_P, Local pid, Remote pid or name, Ref}, which is exactly what's
needed on the other side... */
int
erts_dsig_send_monitor(ErtsDSigData *dsdp, Eterm watcher, Eterm watched,
Eterm ref)
{
Eterm ctl;
DeclareTmpHeapNoproc(ctl_heap,5);
int res;
UseTmpHeapNoproc(5);
ctl = TUPLE4(&ctl_heap[0],
make_small(DOP_MONITOR_P),
watcher, watched, ref);
res = dsig_send_ctl(dsdp, ctl, 0);
UnUseTmpHeapNoproc(5);
return res;
}
/* A local process monitoring a remote one wants to stop monitoring, either
because of a demonitor bif call or because the local process died. We send
{DOP_DEMONITOR_P, Local pid, Remote pid or name, ref}, which is once again
rather redundant as only the ref will be needed on the other side... */
int
erts_dsig_send_demonitor(ErtsDSigData *dsdp, Eterm watcher,
Eterm watched, Eterm ref, int force)
{
Eterm ctl;
DeclareTmpHeapNoproc(ctl_heap,5);
int res;
UseTmpHeapNoproc(5);
ctl = TUPLE4(&ctl_heap[0],
make_small(DOP_DEMONITOR_P),
watcher, watched, ref);
res = dsig_send_ctl(dsdp, ctl, force);
UnUseTmpHeapNoproc(5);
return res;
}
int
erts_dsig_send_msg(Eterm remote, Eterm message, ErtsSendContext* ctx)
{
Eterm ctl;
Eterm token = NIL;
Process *sender = ctx->dsd.proc;
int res;
#ifdef USE_VM_PROBES
Sint tok_label = 0;
Sint tok_lastcnt = 0;
Sint tok_serial = 0;
Uint msize = 0;
DTRACE_CHARBUF(node_name, 64);
DTRACE_CHARBUF(sender_name, 64);
DTRACE_CHARBUF(receiver_name, 64);
#endif
if (SEQ_TRACE_TOKEN(sender) != NIL
#ifdef USE_VM_PROBES
&& SEQ_TRACE_TOKEN(sender) != am_have_dt_utag
#endif
) {
seq_trace_update_send(sender);
token = SEQ_TRACE_TOKEN(sender);
seq_trace_output(token, message, SEQ_TRACE_SEND, remote, sender);
}
#ifdef USE_VM_PROBES
*node_name = *sender_name = *receiver_name = '\0';
if (DTRACE_ENABLED(message_send) || DTRACE_ENABLED(message_send_remote)) {
erts_snprintf(node_name, sizeof(DTRACE_CHARBUF_NAME(node_name)),
"%T", ctx->dsd.dep->sysname);
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", remote);
msize = size_object(message);
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));
}
}
#endif
if (token != NIL)
ctl = TUPLE4(&ctx->ctl_heap[0],
make_small(DOP_SEND_TT), am_Cookie, remote, token);
else
ctl = TUPLE3(&ctx->ctl_heap[0], make_small(DOP_SEND), am_Cookie, remote);
DTRACE6(message_send, sender_name, receiver_name,
msize, tok_label, tok_lastcnt, tok_serial);
DTRACE7(message_send_remote, sender_name, node_name, receiver_name,
msize, tok_label, tok_lastcnt, tok_serial);
ctx->dss.ctl = ctl;
ctx->dss.msg = message;
ctx->dss.force_busy = 0;
res = erts_dsig_send(&ctx->dsd, &ctx->dss);
return res;
}
int
erts_dsig_send_reg_msg(Eterm remote_name, Eterm message,
ErtsSendContext* ctx)
{
Eterm ctl;
Eterm token = NIL;
Process *sender = ctx->dsd.proc;
int res;
#ifdef USE_VM_PROBES
Sint tok_label = 0;
Sint tok_lastcnt = 0;
Sint tok_serial = 0;
Uint32 msize = 0;
DTRACE_CHARBUF(node_name, 64);
DTRACE_CHARBUF(sender_name, 64);
DTRACE_CHARBUF(receiver_name, 128);
#endif
if (SEQ_TRACE_TOKEN(sender) != NIL
#ifdef USE_VM_PROBES
&& SEQ_TRACE_TOKEN(sender) != am_have_dt_utag
#endif
) {
seq_trace_update_send(sender);
token = SEQ_TRACE_TOKEN(sender);
seq_trace_output(token, message, SEQ_TRACE_SEND, remote_name, sender);
}
#ifdef USE_VM_PROBES
*node_name = *sender_name = *receiver_name = '\0';
if (DTRACE_ENABLED(message_send) || DTRACE_ENABLED(message_send_remote)) {
erts_snprintf(node_name, sizeof(DTRACE_CHARBUF_NAME(node_name)),
"%T", ctx->dsd.dep->sysname);
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,%s}", remote_name, node_name);
msize = size_object(message);
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));
}
}
#endif
if (token != NIL)
ctl = TUPLE5(&ctx->ctl_heap[0], make_small(DOP_REG_SEND_TT),
sender->common.id, am_Cookie, remote_name, token);
else
ctl = TUPLE4(&ctx->ctl_heap[0], make_small(DOP_REG_SEND),
sender->common.id, am_Cookie, remote_name);
DTRACE6(message_send, sender_name, receiver_name,
msize, tok_label, tok_lastcnt, tok_serial);
DTRACE7(message_send_remote, sender_name, node_name, receiver_name,
msize, tok_label, tok_lastcnt, tok_serial);
ctx->dss.ctl = ctl;
ctx->dss.msg = message;
ctx->dss.force_busy = 0;
res = erts_dsig_send(&ctx->dsd, &ctx->dss);
return res;
}
/* local has died, deliver the exit signal to remote */
int
erts_dsig_send_exit_tt(ErtsDSigData *dsdp, Eterm local, Eterm remote,
Eterm reason, Eterm token)
{
Eterm ctl;
DeclareTmpHeapNoproc(ctl_heap,6);