[asterisk-commits] irroot: branch irroot/distrotech-customers-1.8 r321658 - /team/irroot/distrot...
SVN commits to the Asterisk project
asterisk-commits at lists.digium.com
Fri Jun 3 00:40:34 CDT 2011
Author: irroot
Date: Fri Jun 3 00:40:30 2011
New Revision: 321658
URL: http://svnview.digium.com/svn/asterisk?view=rev&rev=321658
Log:
resolve conflict, enable automerge
Modified:
team/irroot/distrotech-customers-1.8/channels/chan_local.c
Modified: team/irroot/distrotech-customers-1.8/channels/chan_local.c
URL: http://svnview.digium.com/svn/asterisk/team/irroot/distrotech-customers-1.8/channels/chan_local.c?view=diff&rev=321658&r1=321657&r2=321658
==============================================================================
--- team/irroot/distrotech-customers-1.8/channels/chan_local.c (original)
+++ team/irroot/distrotech-customers-1.8/channels/chan_local.c Fri Jun 3 00:40:30 2011
@@ -155,68 +155,124 @@
#define LOCAL_BRIDGE (1 << 3) /*!< Report back the "true" channel as being bridged to */
#define LOCAL_MOH_PASSTHRU (1 << 4) /*!< Pass through music on hold start/stop frames */
-static int local_setoption(struct ast_channel *chan, int option, void * data, int datalen)
-{
- int res;
- struct local_pvt *p;
- struct ast_channel *otherchan;
+/*
+ * \brief Send a pvt in with no locks held and get all locks
+ *
+ * \note NO locks should be held prior to calling this function
+ * \note The pvt must have a ref held before calling this function
+ * \note if outchan or outowner is set != NULL after calling this function
+ * those channels are locked and reffed.
+ * \note Batman.
+ */
+static void awesome_locking(struct local_pvt *p, struct ast_channel **outchan, struct ast_channel **outowner)
+{
+ struct ast_channel *chan = NULL;
+ struct ast_channel *owner = NULL;
+
+ for (;;) {
+ ao2_lock(p);
+ if (p->chan) {
+ chan = p->chan;
+ ast_channel_ref(chan);
+ }
+ if (p->owner) {
+ owner = p->owner;
+ ast_channel_ref(owner);
+ }
+ ao2_unlock(p);
+
+ /* if we don't have both channels, then this is very easy */
+ if (!owner || !chan) {
+ if (owner) {
+ ast_channel_lock(owner);
+ } else if(chan) {
+ ast_channel_lock(chan);
+ }
+ ao2_lock(p);
+ } else {
+ /* lock both channels first, then get the pvt lock */
+ ast_channel_lock(chan);
+ while (ast_channel_trylock(owner)) {
+ CHANNEL_DEADLOCK_AVOIDANCE(chan);
+ }
+ ao2_lock(p);
+ }
+
+ /* Now that we have all the locks, validate that nothing changed */
+ if (p->owner != owner || p->chan != chan) {
+ if (owner) {
+ ast_channel_unlock(owner);
+ owner = ast_channel_unref(owner);
+ }
+ if (chan) {
+ ast_channel_unlock(chan);
+ chan = ast_channel_unref(chan);
+ }
+ ao2_unlock(p);
+ continue;
+ }
+
+ break;
+ }
+ *outowner = p->owner;
+ *outchan = p->chan;
+}
+
+static int local_setoption(struct ast_channel *ast, int option, void * data, int datalen)
+{
+ int res = 0;
+ struct local_pvt *p = NULL;
+ struct ast_channel *otherchan = NULL;
ast_chan_write_info_t *write_info;
if (option != AST_OPTION_CHANNEL_WRITE) {
- return -1;
+ res = -1;
+ goto setoption_cleanup;
}
write_info = data;
if (write_info->version != AST_CHAN_WRITE_INFO_T_VERSION) {
ast_log(LOG_ERROR, "The chan_write_info_t type has changed, and this channel hasn't been updated!\n");
- return -1;
- }
-
-
-startover:
- ast_channel_lock(chan);
-
- p = chan->tech_pvt;
- if (!p) {
- ast_channel_unlock(chan);
- ast_log(LOG_WARNING, "Could not update other side of %s, local_pvt went away.\n", chan->name);
- return -1;
- }
-
- while (ao2_trylock(p)) {
- ast_channel_unlock(chan);
- sched_yield();
- ast_channel_lock(chan);
- p = chan->tech_pvt;
- if (!p) {
- ast_channel_unlock(chan);
- ast_log(LOG_WARNING, "Could not update other side of %s, local_pvt went away.\n", chan->name);
- return -1;
- }
- }
-
+ res = -1;
+ goto setoption_cleanup;
+ }
+
+ /* get the tech pvt */
+ ast_channel_lock(ast);
+ if (!(p = ast->tech_pvt)) {
+ ast_channel_unlock(ast);
+ res = -1;
+ goto setoption_cleanup;
+ }
+ ao2_ref(p, 1);
+ ast_channel_unlock(ast);
+
+ /* get the channel we are supposed to write to */
+ ao2_lock(p);
otherchan = (write_info->chan == p->owner) ? p->chan : p->owner;
-
if (!otherchan || otherchan == write_info->chan) {
+ res = -1;
+ otherchan = NULL;
ao2_unlock(p);
- ast_channel_unlock(chan);
- ast_log(LOG_WARNING, "Could not update other side of %s, other side went away.\n", chan->name);
- return 0;
- }
-
- if (ast_channel_trylock(otherchan)) {
- ao2_unlock(p);
- ast_channel_unlock(chan);
- goto startover;
- }
-
+ goto setoption_cleanup;
+ }
+ ast_channel_ref(otherchan);
+
+ /* clear the pvt lock before grabbing the channel */
+ ao2_unlock(p);
+
+ ast_channel_lock(otherchan);
res = write_info->write_fn(otherchan, write_info->function, write_info->data, write_info->value);
-
ast_channel_unlock(otherchan);
- ao2_unlock(p);
- ast_channel_unlock(chan);
-
+
+setoption_cleanup:
+ if (p) {
+ ao2_ref(p, -1);
+ }
+ if (otherchan) {
+ ast_channel_unref(otherchan);
+ }
return res;
}
@@ -295,57 +351,51 @@
static int local_queryoption(struct ast_channel *ast, int option, void *data, int *datalen)
{
- struct local_pvt *p = ast->tech_pvt;
- struct ast_channel *chan, *bridged;
- int res;
-
- if (!p) {
- return -1;
- }
+ struct local_pvt *p;
+ struct ast_channel *bridged = NULL;
+ struct ast_channel *tmp = NULL;
+ int res = 0;
if (option != AST_OPTION_T38_STATE) {
/* AST_OPTION_T38_STATE is the only supported option at this time */
return -1;
}
+ /* for some reason the channel is not locked in channel.c when this function is called */
+ ast_channel_lock(ast);
+ if (!(p = ast->tech_pvt)) {
+ ast_channel_unlock(ast);
+ return -1;
+ }
+
ao2_lock(p);
- chan = IS_OUTBOUND(ast, p) ? p->owner : p->chan;
-
-try_again:
- if (!chan) {
+ if (!(tmp = IS_OUTBOUND(ast, p) ? p->owner : p->chan)) {
ao2_unlock(p);
- return -1;
- }
-
- if (ast_channel_trylock(chan)) {
- ao2_unlock(p);
- sched_yield();
- ao2_lock(p);
- chan = IS_OUTBOUND(ast, p) ? p->owner : p->chan;
- goto try_again;
- }
-
- bridged = ast_bridged_channel(chan);
- if (!bridged) {
- /* can't query channel unless we are bridged */
- ao2_unlock(p);
- ast_channel_unlock(chan);
- return -1;
- }
-
- if (ast_channel_trylock(bridged)) {
- ast_channel_unlock(chan);
- ao2_unlock(p);
- sched_yield();
- ao2_lock(p);
- chan = IS_OUTBOUND(ast, p) ? p->owner : p->chan;
- goto try_again;
- }
-
- res = ast_channel_queryoption(bridged, option, data, datalen, 0);
+ ast_channel_unlock(ast);
+ return -1;
+ }
+ ast_channel_ref(tmp);
ao2_unlock(p);
- ast_channel_unlock(chan);
- ast_channel_unlock(bridged);
+ ast_channel_unlock(ast);
+
+ ast_channel_lock(tmp);
+ if (!(bridged = ast_bridged_channel(tmp))) {
+ res = -1;
+ ast_channel_unlock(tmp);
+ goto query_cleanup;
+ }
+ ast_channel_ref(bridged);
+ ast_channel_unlock(tmp);
+
+query_cleanup:
+ if (bridged) {
+ res = ast_channel_queryoption(bridged, option, data, datalen, 0);
+ bridged = ast_channel_unref(bridged);
+ }
+ if (tmp) {
+ tmp = ast_channel_unref(tmp);
+ }
+
return res;
}
@@ -374,31 +424,24 @@
return 0;
}
- /* Ensure that we have both channels locked */
- while (other && ast_channel_trylock(other)) {
- int res;
- if ((res = ao2_unlock(p))) {
- ast_log(LOG_ERROR, "chan_local bug! '&p->lock' was not locked when entering local_queue_frame! (%s)\n", strerror(res));
- return -1;
- }
- if (us && us_locked) {
- do {
- CHANNEL_DEADLOCK_AVOIDANCE(us);
- } while (ao2_trylock(p));
- } else {
- usleep(1);
- ao2_lock(p);
- }
- other = isoutbound ? p->owner : p->chan;
- }
-
- if (other) {
- if (f->frametype == AST_FRAME_CONTROL && f->subclass.integer == AST_CONTROL_RINGING) {
- ast_setstate(other, AST_STATE_RINGING);
- }
- ast_queue_frame(other, f);
- ast_channel_unlock(other);
- }
+ /* grab a ref on the channel before unlocking the pvt,
+ * other can not go away from us now regardless of locking */
+ ast_channel_ref(other);
+ if (us && us_locked) {
+ ast_channel_unlock(us);
+ }
+ ao2_unlock(p);
+
+ if (f->frametype == AST_FRAME_CONTROL && f->subclass.integer == AST_CONTROL_RINGING) {
+ ast_setstate(other, AST_STATE_RINGING);
+ }
+ ast_queue_frame(other, f);
+
+ other = ast_channel_unref(other);
+ if (us && us_locked) {
+ ast_channel_lock(us);
+ }
+ ao2_lock(p);
return 0;
}
@@ -430,12 +473,38 @@
/*!
* \internal
* \note This function assumes that we're only called from the "outbound" local channel side
+ *
+ * \note it is assummed p is locked and reffed before entering this function
*/
static void check_bridge(struct local_pvt *p)
{
struct ast_channel_monitor *tmp;
- if (ast_test_flag(p, LOCAL_ALREADY_MASQED) || ast_test_flag(p, LOCAL_NO_OPTIMIZATION) || !p->chan || !p->owner || (p->chan->_bridge != ast_bridged_channel(p->chan)))
+ struct ast_channel *chan = NULL;
+ struct ast_channel *bridged_chan = NULL;
+
+ /* Do a few conditional checks early on just to see if this optimization is possible */
+ if (ast_test_flag(p, LOCAL_NO_OPTIMIZATION)) {
return;
+ }
+ if (ast_test_flag(p, LOCAL_ALREADY_MASQED) || !p->chan || !p->owner) {
+ return;
+ }
+
+ /* Safely get the channel bridged to p->chan */
+ chan = ast_channel_ref(p->chan);
+
+ ao2_unlock(p); /* don't call bridged channel with the pvt locked */
+ bridged_chan = ast_bridged_channel(chan);
+ ao2_lock(p);
+
+ chan = ast_channel_unref(chan);
+
+ /* since we had to unlock p to get the bridged chan, validate our
+ * data once again and verify the bridged channel is what we expect
+ * it to be in order to perform this optimization */
+ if (ast_test_flag(p, LOCAL_ALREADY_MASQED) || !p->owner || !p->chan || (p->chan->_bridge != bridged_chan)) {
+ return;
+ }
/* only do the masquerade if we are being called on the outbound channel,
if it has been bridged to another channel and if there are no pending
@@ -523,16 +592,18 @@
int res = -1;
int isoutbound;
- if (!p)
- return -1;
+ if (!p) {
+ return -1;
+ }
/* Just queue for delivery to the other side */
while(ao2_trylock(p)) {
CHANNEL_DEADLOCK_AVOIDANCE(ast);
}
ao2_ref(p, 1); /* ref for local_queue_frame */
-
+ ao2_lock(p);
isoutbound = IS_OUTBOUND(ast, p);
+
if (isoutbound && f && (f->frametype == AST_FRAME_VOICE || f->frametype == AST_FRAME_VIDEO)) {
check_bridge(p);
} else if (!isoutbound) {
@@ -551,9 +622,9 @@
}
}
- if (!ast_test_flag(p, LOCAL_ALREADY_MASQED))
+ if (!ast_test_flag(p, LOCAL_ALREADY_MASQED)) {
res = local_queue_frame(p, isoutbound, f, ast, 1);
- else {
+ } else {
ast_debug(1, "Not posting to queue since already masked on '%s'\n", ast->name);
res = 0;
}
@@ -752,49 +823,38 @@
static int local_call(struct ast_channel *ast, char *dest, int timeout)
{
struct local_pvt *p = ast->tech_pvt;
+ int pvt_locked = 0;
+
+ struct ast_channel *owner = NULL;
+ struct ast_channel *chan = NULL;
int res;
struct ast_var_t *varptr = NULL, *new;
size_t len, namelen;
char *reduced_dest = ast_strdupa(dest);
char *slash;
- struct ast_channel *chan;
const char *exten;
const char *context;
- if (!p || p->owner != ast) {
+ if (!p) {
return -1;
}
/* since we are letting go of channel locks that were locked coming into
* this function, then we need to give the tech pvt a ref */
ao2_ref(p, 1);
-
- while (ao2_trylock(p)) {
- ast_channel_unlock(ast);
- sched_yield();
- ast_channel_lock(ast);
- }
- while ((p->chan && p->owner) && ast_channel_trylock(p->chan)) {
- ao2_unlock(p);
- if (p->owner) {
- ast_channel_unlock(p->owner);
- }
- sched_yield();
- if (p->owner) {
- ast_channel_lock(p->owner);
- }
- ao2_lock(p);
- }
-
- if (!p->owner || !p->chan) {
- /* someone went away during the locking madness.
- * time to bail. */
- if (p->chan) {
- ast_channel_unlock(p->chan);
- }
- ao2_unlock(p);
- ao2_ref(p,-1);
- return -1;
+ ast_channel_unlock(ast);
+
+ awesome_locking(p, &chan, &owner);
+ pvt_locked = 1;
+
+ if (owner != ast) {
+ res = -1;
+ goto return_cleanup;
+ }
+
+ if (!owner || !chan) {
+ res = -1;
+ goto return_cleanup;
}
/*
@@ -804,37 +864,37 @@
* All these failure points just return -1. The individual strings will
* be cleared when we destroy the channel.
*/
- ast_party_redirecting_copy(&p->chan->redirecting, &p->owner->redirecting);
-
- ast_party_dialed_copy(&p->chan->dialed, &p->owner->dialed);
-
- ast_connected_line_copy_to_caller(&p->chan->caller, &p->owner->connected);
- ast_connected_line_copy_from_caller(&p->chan->connected, &p->owner->caller);
-
- ast_string_field_set(p->chan, language, p->owner->language);
- ast_string_field_set(p->chan, accountcode, p->owner->accountcode);
- ast_string_field_set(p->chan, musicclass, p->owner->musicclass);
- ast_cdr_update(p->chan);
-
- ast_channel_cc_params_init(p->chan, ast_channel_get_cc_config_params(p->owner));
+ ast_party_redirecting_copy(&chan->redirecting, &owner->redirecting);
+
+ ast_party_dialed_copy(&chan->dialed, &owner->dialed);
+
+ ast_connected_line_copy_to_caller(&chan->caller, &owner->connected);
+ ast_connected_line_copy_from_caller(&chan->connected, &owner->caller);
+
+ ast_string_field_set(chan, language, owner->language);
+ ast_string_field_set(chan, accountcode, owner->accountcode);
+ ast_string_field_set(chan, musicclass, owner->musicclass);
+ ast_cdr_update(chan);
+
+ ast_channel_cc_params_init(chan, ast_channel_get_cc_config_params(owner));
/* Make sure we inherit the ANSWERED_ELSEWHERE flag if it's set on the queue/dial call request in the dialplan */
if (ast_test_flag(ast, AST_FLAG_ANSWERED_ELSEWHERE)) {
- ast_set_flag(p->chan, AST_FLAG_ANSWERED_ELSEWHERE);
+ ast_set_flag(chan, AST_FLAG_ANSWERED_ELSEWHERE);
}
/* copy the channel variables from the incoming channel to the outgoing channel */
/* Note that due to certain assumptions, they MUST be in the same order */
- AST_LIST_TRAVERSE(&p->owner->varshead, varptr, entries) {
+ AST_LIST_TRAVERSE(&owner->varshead, varptr, entries) {
namelen = strlen(varptr->name);
len = sizeof(struct ast_var_t) + namelen + strlen(varptr->value) + 2;
if ((new = ast_calloc(1, len))) {
memcpy(new, varptr, len);
new->value = &(new->name[0]) + namelen + 1;
- AST_LIST_INSERT_TAIL(&p->chan->varshead, new, entries);
- }
- }
- ast_channel_datastore_inherit(p->owner, p->chan);
+ AST_LIST_INSERT_TAIL(&chan->varshead, new, entries);
+ }
+ }
+ ast_channel_datastore_inherit(owner, chan);
/* If the local channel has /n or /b on the end of it,
* we need to lop that off for our argument to setting
* up the CC_INTERFACES variable
@@ -842,18 +902,21 @@
if ((slash = strrchr(reduced_dest, '/'))) {
*slash = '\0';
}
- ast_set_cc_interfaces_chanvar(p->chan, reduced_dest);
-
- chan = ast_channel_ref(p->chan);
- ao2_unlock(p);
+ ast_set_cc_interfaces_chanvar(chan, reduced_dest);
+
exten = ast_strdupa(chan->exten);
context = ast_strdupa(chan->context);
+
+ ao2_unlock(p);
+ pvt_locked = 0;
+
ast_channel_unlock(chan);
if (!ast_exists_extension(chan, context, exten, 1,
- S_COR(p->owner->caller.id.number.valid, p->owner->caller.id.number.str, NULL))) {
+ S_COR(owner->caller.id.number.valid, owner->caller.id.number.str, NULL))) {
ast_log(LOG_NOTICE, "No such extension/context %s@%s while calling Local channel\n", exten, context);
res = -1;
+ chan = ast_channel_unref(chan); /* we already unlocked it, so clear it hear so the cleanup label won't touch it. */
goto return_cleanup;
}
@@ -863,10 +926,33 @@
ast_set_flag(p, LOCAL_LAUNCHED_PBX);
ao2_unlock(p);
}
+ chan = ast_channel_unref(chan); /* chan is already unlocked, clear it here so the cleanup lable won't touch it. */
return_cleanup:
- ast_channel_unref(chan);
- ao2_ref(p, -1);
+ if (p) {
+ if (pvt_locked) {
+ ao2_unlock(p);
+ }
+ ao2_ref(p, -1);
+ }
+ if (chan) {
+ ast_channel_unlock(chan);
+ chan = ast_channel_unref(chan);
+ }
+
+ /* owner is supposed to be == to ast, if it
+ * is, don't unlock it because ast must exit locked */
+ if (owner) {
+ if (owner != ast) {
+ ast_channel_unlock(owner);
+ ast_channel_lock(ast);
+ }
+ owner = ast_channel_unref(owner);
+ } else {
+ /* we have to exit with ast locked */
+ ast_channel_lock(ast);
+ }
+
return res;
}
@@ -875,19 +961,31 @@
{
struct local_pvt *p = ast->tech_pvt;
int isoutbound;
+ int hangup_chan = 0;
+ int res = 0;
struct ast_frame f = { AST_FRAME_CONTROL, { AST_CONTROL_HANGUP }, .data.uint32 = ast->hangupcause };
- struct ast_channel *ochan = NULL;
-
- if (!p)
- return -1;
-
- /* we MUST give the tech_pvt a ref here since we are unlocking the
- * channel during deadlock avoidance. */
+ struct ast_channel *owner = NULL;
+ struct ast_channel *chan = NULL;
+
+ if (!p) {
+ return -1;
+ }
+
+ /* give the pvt a ref since we are unlocking the channel. */
ao2_ref(p, 1);
- ao2_lock(p);
-
- isoutbound = IS_OUTBOUND(ast, p);
+ /* the pvt isn't going anywhere, we gave it a ref */
+ ast_channel_unlock(ast);
+
+ /* lock everything */
+ awesome_locking(p, &chan, &owner);
+
+ if (ast != chan && ast != owner) {
+ res = -1;
+ goto local_hangup_cleanup;
+ }
+
+ isoutbound = IS_OUTBOUND(ast, p); /* just comparing pointer of ast */
if (p->chan && ast_test_flag(ast, AST_FLAG_ANSWERED_ELSEWHERE)) {
ast_set_flag(p->chan, AST_FLAG_ANSWERED_ELSEWHERE);
@@ -897,92 +995,59 @@
if (isoutbound) {
const char *status = pbx_builtin_getvar_helper(p->chan, "DIALSTATUS");
if ((status) && (p->owner)) {
- /* Deadlock avoidance */
- while (p->owner && ast_channel_trylock(p->owner)) {
- ao2_unlock(p);
- if (p->chan) {
- ast_channel_unlock(p->chan);
- }
- sched_yield();
- if (p->chan) {
- ast_channel_lock(p->chan);
- }
- ao2_lock(p);
- }
- if (p->owner) {
- p->owner->hangupcause = p->chan->hangupcause;
- pbx_builtin_setvar_helper(p->owner, "CHANLOCALSTATUS", status);
- ast_channel_unlock(p->owner);
- }
- }
- if (!p->chan) {
- /* chan was == to ast and was !NULL before deadlock avoidance started, if chan
- * is NULL now, then we should bail because that channel
- * hungup already. This is possible because we let go of the
- * lock given to the ast channel passed to this function during
- * deadlock avoidance. */
- ao2_unlock(p);
- ao2_ref(p, -1);
- return 0;
- }
- p->chan = NULL;
+ p->owner->hangupcause = p->chan->hangupcause;
+ pbx_builtin_setvar_helper(p->owner, "CHANLOCALSTATUS", status);
+ }
+
ast_clear_flag(p, LOCAL_LAUNCHED_PBX);
ast_module_user_remove(p->u_chan);
+ p->chan = NULL;
} else {
ast_module_user_remove(p->u_owner);
- while (p->chan && ast_channel_trylock(p->chan)) {
- ao2_unlock(p);
- if (p->owner) {
- ast_channel_unlock(p->owner);
- }
- sched_yield();
- if (p->owner) {
- ast_channel_lock(p->owner);
- }
- ao2_lock(p);
- }
if (p->chan) {
ast_queue_hangup(p->chan);
- ast_channel_unlock(p->chan);
- }
-
- if (!p->owner) {
- /* owner was == to ast and was !NULL before deadlock avoidance started, if
- * owner is NULL now, then we should bail because that channel
- * hungup already. This is possible because we let go of the
- * lock given to the ast channel passed to this function during
- * deadlock avoidance. */
- ao2_unlock(p);
- ao2_ref(p, -1);
- return 0;
}
p->owner = NULL;
}
- ast->tech_pvt = NULL;
+ ast->tech_pvt = NULL; /* this is one of our locked channels, doesn't matter which */
if (!p->owner && !p->chan) {
ao2_unlock(p);
-
/* Remove from list */
ao2_unlink(locals, p);
ao2_ref(p, -1);
- return 0;
+ p = NULL;
+ res = 0;
+ goto local_hangup_cleanup;
}
if (p->chan && !ast_test_flag(p, LOCAL_LAUNCHED_PBX)) {
/* Need to actually hangup since there is no PBX */
- ochan = p->chan;
+ hangup_chan = 1;
} else {
- local_queue_frame(p, isoutbound, &f, NULL, 1);
- }
-
- ao2_unlock(p);
- if (ochan) {
- ast_hangup(ochan);
- }
-
- ao2_ref(p, -1);
- return 0;
+ local_queue_frame(p, isoutbound, &f, NULL, 0);
+ }
+
+local_hangup_cleanup:
+ if (p) {
+ ao2_unlock(p);
+ ao2_ref(p, -1);
+ }
+ if (chan) {
+ ast_channel_unlock(chan);
+ if (hangup_chan) {
+ ast_hangup(chan);
+ }
+ chan = ast_channel_unref(chan);
+ }
+ if (owner) {
+ ast_channel_unlock(owner);
+ owner = ast_channel_unref(owner);
+ }
+
+ /* leave with the same stupid channel locked that came in */
+ ast_channel_lock(ast);
+ return res;
}
/*! \brief Create a call structure */
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