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A new way to try and deal with deadlocks that occur in app_queue at present. Using this approach, we only manipulate the main queue mutexes when we get a dev state change on a device that is actually a member of a queue. Backported from /trunk for the "bug fix".

Browse Source 
git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@30546 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
BJ Weschke
2006-05-26 17:09:51 +00:00
parent f1744d3e31
commit a94248e7dc
1 changed files with 146 additions and 29 deletions
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175
apps/app_queue.c
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@@ -303,6 +303,13 @@ struct member {
struct member *next; /*!< Next member */
};
struct ast_member_interfaces {
char interface[80];
AST_LIST_ENTRY(ast_member_interfaces) list; /*!< Next call queue */
};
static AST_LIST_HEAD_STATIC(interfaces, ast_member_interfaces);
/* values used in multi-bit flags in ast_call_queue */
#define QUEUE_EMPTY_NORMAL 1
#define QUEUE_EMPTY_STRICT 2
@@ -458,6 +465,7 @@ static void *changethread(void *data)
struct ast_call_queue *q;
struct statechange *sc = data;
struct member *cur;
struct ast_member_interfaces *curint;
char *loc;
char *technology;
@@ -470,36 +478,50 @@ static void *changethread(void *data)
free(sc);
return NULL;
}
if (option_debug)
ast_log(LOG_DEBUG, "Device '%s/%s' changed to state '%d' (%s)\n", technology, loc, sc->state, devstate2str(sc->state));
ast_mutex_lock(&qlock);
for (q = queues; q; q = q->next) {
ast_mutex_lock(&q->lock);
cur = q->members;
while(cur) {
if (!strcasecmp(sc->dev, cur->interface)) {
if (cur->status != sc->state) {
cur->status = sc->state;
if (!q->maskmemberstatus) {
manager_event(EVENT_FLAG_AGENT, "QueueMemberStatus",
"Queue: %s\r\n"
"Location: %s\r\n"
"Membership: %s\r\n"
"Penalty: %d\r\n"
"CallsTaken: %d\r\n"
"LastCall: %d\r\n"
"Status: %d\r\n"
"Paused: %d\r\n",
q->name, cur->interface, cur->dynamic ? "dynamic" : "static",
cur->penalty, cur->calls, (int)cur->lastcall, cur->status, cur->paused);
AST_LIST_LOCK(&interfaces);
AST_LIST_TRAVERSE(&interfaces, curint, list) {
if (!strcasecmp(curint->interface, sc->dev))
break;
}
AST_LIST_UNLOCK(&interfaces);
if (curint) {
if (option_debug)
ast_log(LOG_DEBUG, "Device '%s/%s' changed to state '%d' (%s)\n", technology, loc, sc->state, devstate2str(sc->state));
ast_mutex_lock(&qlock);
for (q = queues; q; q = q->next) {
ast_mutex_lock(&q->lock);
cur = q->members;
while(cur) {
if (!strcasecmp(sc->dev, cur->interface)) {
if (cur->status != sc->state) {
cur->status = sc->state;
if (!q->maskmemberstatus) {
manager_event(EVENT_FLAG_AGENT, "QueueMemberStatus",
"Queue: %s\r\n"
"Location: %s\r\n"
"Membership: %s\r\n"
"Penalty: %d\r\n"
"CallsTaken: %d\r\n"
"LastCall: %d\r\n"
"Status: %d\r\n"
"Paused: %d\r\n",
q->name, cur->interface, cur->dynamic ? "dynamic" : "static",
cur->penalty, cur->calls, (int)cur->lastcall, cur->status, cur->paused);
}
}
}
cur = cur->next;
}
cur = cur->next;
ast_mutex_unlock(&q->lock);
}
ast_mutex_unlock(&q->lock);
}
ast_mutex_unlock(&qlock);
ast_mutex_unlock(&qlock);
} else {
if (option_debug)
ast_log(LOG_DEBUG, "Device '%s/%s' changed to state '%d' (%s) but we don't care because they're not a member of any queue.\n", technology, loc, sc->state, devstate2str(sc->state));
}
free(sc);
return NULL;
}
@@ -596,6 +618,89 @@ static void clear_queue(struct ast_call_queue *q)
q->wrapuptime = 0;
}
static int add_to_interfaces(char *interface)
{
struct ast_member_interfaces *curint, *newint;
AST_LIST_LOCK(&interfaces);
AST_LIST_TRAVERSE(&interfaces, curint, list) {
if (!strcasecmp(curint->interface, interface))
break;
}
if (!curint) {
if (option_debug)
ast_log(LOG_DEBUG, "Adding %s to the list of interfaces that make up all of our queue members.\n", interface);
if ((newint = malloc(sizeof(*newint)))) {
memset(newint, 0, sizeof(*newint));
ast_copy_string(newint->interface, interface, sizeof(newint->interface));
AST_LIST_INSERT_HEAD(&interfaces, newint, list);
}
}
AST_LIST_UNLOCK(&interfaces);
return 0;
}
static int interface_exists_global(char *interface)
{
struct ast_call_queue *q;
struct member *mem;
int ret = 0;
ast_mutex_lock(&qlock);
for (q = queues; q && !ret; q = q->next) {
ast_mutex_lock(&q->lock);
mem = q->members;
while(mem) {
if (!strcasecmp(interface, mem->interface)) {
ret = 1;
break;
}
}
ast_mutex_unlock(&q->lock);
}
ast_mutex_unlock(&qlock);
return ret;
}
static int remove_from_interfaces(char *interface)
{
struct ast_member_interfaces *curint;
AST_LIST_LOCK(&interfaces);
AST_LIST_TRAVERSE_SAFE_BEGIN(&interfaces, curint, list) {
if (!strcasecmp(curint->interface, interface) && !interface_exists_global(interface)) {
if (option_debug)
ast_log(LOG_DEBUG, "Removing %s from the list of interfaces that make up all of our queue members.\n", interface);
AST_LIST_REMOVE_CURRENT(&interfaces, list);
free(curint);
}
}
AST_LIST_TRAVERSE_SAFE_END;
AST_LIST_UNLOCK(&interfaces);
return 0;
}
static void clear_and_free_interfaces(void)
{
struct ast_member_interfaces *curint;
AST_LIST_LOCK(&interfaces);
AST_LIST_TRAVERSE_SAFE_BEGIN(&interfaces, curint, list) {
AST_LIST_REMOVE_CURRENT(&interfaces, list);
free(curint);
}
AST_LIST_TRAVERSE_SAFE_END;
AST_LIST_UNLOCK(&interfaces);
return;
}
/*! \brief Configure a queue parameter.
\par
For error reporting, line number is passed for .conf static configuration.
@@ -746,6 +851,7 @@ static void rt_handle_member_record(struct ast_call_queue *q, char *interface, c
m = create_queue_member(interface, penalty, 0);
if (m) {
m->dead = 0;
add_to_interfaces(interface);
if (prev_m) {
prev_m->next = m;
} else {
@@ -770,6 +876,7 @@ static void free_members(struct ast_call_queue *q, int all)
prev->next = next;
else
q->members = next;
remove_from_interfaces(curm->interface);
free(curm);
} else
prev = curm;
@@ -917,6 +1024,7 @@ static struct ast_call_queue *find_queue_by_name_rt(const char *queuename, struc
} else {
q->members = next_m;
}
remove_from_interfaces(m->interface);
free(m);
} else {
prev_m = m;
@@ -1033,9 +1141,9 @@ static int join_queue(char *queuename, struct queue_ent *qe, enum queue_result *
qe->chan->cid.cid_num ? qe->chan->cid.cid_num : "unknown",
qe->chan->cid.cid_name ? qe->chan->cid.cid_name : "unknown",
q->name, qe->pos, q->count );
#if 0
ast_log(LOG_NOTICE, "Queue '%s' Join, Channel '%s', Position '%d'\n", q->name, qe->chan->name, qe->pos );
#endif
if (option_debug)
ast_log(LOG_DEBUG, "Queue '%s' Join, Channel '%s', Position '%d'\n", q->name, qe->chan->name, qe->pos );
}
ast_mutex_unlock(&q->lock);
ast_mutex_unlock(&qlock);
@@ -2421,6 +2529,8 @@ static int remove_from_queue(char *queuename, char *interface)
}
ast_mutex_unlock(&q->lock);
}
if (res == RES_OKAY)
remove_from_interfaces(interface);
ast_mutex_unlock(&qlock);
return res;
}
@@ -2440,6 +2550,9 @@ static int add_to_queue(char *queuename, char *interface, int penalty, int pause
if (q) {
ast_mutex_lock(&q->lock);
if (interface_exists(q, interface) == NULL) {
add_to_interfaces(interface);
new_member = create_queue_member(interface, penalty, paused);
if (new_member != NULL) {
@@ -3251,6 +3364,8 @@ static void reload_queues(void)
}
free(cur);
} else {
/* Add them to the master int list if necessary */
add_to_interfaces(interface);
newm->next = q->members;
q->members = newm;
}
@@ -3275,6 +3390,7 @@ static void reload_queues(void)
q->members = cur->next;
newm = cur;
}
remove_from_interfaces(cur->interface);
}
}
if (!new)
@@ -3827,6 +3943,7 @@ int unload_module(void)
{
int res;
clear_and_free_interfaces();
res = ast_cli_unregister(&cli_show_queue);
res |= ast_cli_unregister(&cli_show_queues);
res |= ast_cli_unregister(&cli_add_queue_member);