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Convert the contexts lock to a read/write lock to resolve a deadlock. This

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has a nice side benefit of improving performance.  :)

(closes issue #11609)
(closes issue #11080)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@94466 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Russell Bryant
2007-12-21 16:37:47 +00:00
parent ad89849308
commit 5977f8d5be
2 changed files with 51 additions and 32 deletions
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4
include/asterisk/pbx.h
View File

@@ -652,7 +652,9 @@ int ast_ignore_pattern(const char *context, const char *pattern);
* \retval 0 on success
* \retval -1 on error
*/
int ast_lock_contexts(void);
int ast_lock_contexts(void); /* equivalent to wrlock */
int ast_rdlock_contexts(void);
int ast_wrlock_contexts(void);
/*!
* \brief Unlocks contexts

79
main/pbx.c
View File

@@ -488,7 +488,7 @@ static struct pbx_builtin {
};
static struct ast_context *contexts;
AST_MUTEX_DEFINE_STATIC(conlock); /*!< Lock for the ast_context list */
AST_RWLOCK_DEFINE_STATIC(conlock); /*!< Lock for the ast_context list */
static AST_LIST_HEAD_STATIC(apps, ast_app);
@@ -890,12 +890,16 @@ int ast_extension_close(const char *pattern, const char *data, int needmore)
struct ast_context *ast_context_find(const char *name)
{
struct ast_context *tmp = NULL;
ast_mutex_lock(&conlock);
ast_rdlock_contexts();
while ( (tmp = ast_walk_contexts(tmp)) ) {
if (!name || !strcasecmp(name, tmp->name))
break;
}
ast_mutex_unlock(&conlock);
ast_unlock_contexts();
return tmp;
}
@@ -1800,19 +1804,19 @@ static int pbx_extension_helper(struct ast_channel *c, struct ast_context *con,
int matching_action = (action == E_MATCH || action == E_CANMATCH || action == E_MATCHMORE);
ast_mutex_lock(&conlock);
ast_rdlock_contexts();
e = pbx_find_extension(c, con, &q, context, exten, priority, label, callerid, action);
if (e) {
if (matching_action) {
ast_mutex_unlock(&conlock);
ast_unlock_contexts();
return -1; /* success, we found it */
} else if (action == E_FINDLABEL) { /* map the label to a priority */
res = e->priority;
ast_mutex_unlock(&conlock);
ast_unlock_contexts();
return res; /* the priority we were looking for */
} else { /* spawn */
app = pbx_findapp(e->app);
ast_mutex_unlock(&conlock);
ast_unlock_contexts();
if (!app) {
ast_log(LOG_WARNING, "No application '%s' for extension (%s, %s, %d)\n", e->app, context, exten, priority);
return -1;
@@ -1847,7 +1851,7 @@ static int pbx_extension_helper(struct ast_channel *c, struct ast_context *con,
return pbx_exec(c, app, passdata); /* 0 on success, -1 on failure */
}
} else if (q.swo) { /* not found here, but in another switch */
ast_mutex_unlock(&conlock);
ast_unlock_contexts();
if (matching_action) {
return -1;
} else {
@@ -1858,7 +1862,7 @@ static int pbx_extension_helper(struct ast_channel *c, struct ast_context *con,
return q.swo->exec(c, q.foundcontext ? q.foundcontext : context, exten, priority, callerid, q.data);
}
} else { /* not found anywhere, see what happened */
ast_mutex_unlock(&conlock);
ast_unlock_contexts();
switch (q.status) {
case STATUS_NO_CONTEXT:
if (!matching_action)
@@ -1891,9 +1895,9 @@ static struct ast_exten *ast_hint_extension(struct ast_channel *c, const char *c
struct ast_exten *e;
struct pbx_find_info q = { .stacklen = 0 }; /* the rest is set in pbx_find_context */
ast_mutex_lock(&conlock);
ast_rdlock_contexts();
e = pbx_find_extension(c, NULL, &q, context, exten, PRIORITY_HINT, NULL, "", E_MATCH);
ast_mutex_unlock(&conlock);
ast_unlock_contexts();
return e;
}
@@ -2011,7 +2015,7 @@ void ast_hint_state_changed(const char *device)
{
struct ast_hint *hint;
ast_mutex_lock(&conlock);
ast_rdlock_contexts();
AST_LIST_LOCK(&hints);
AST_LIST_TRAVERSE(&hints, hint, list) {
@@ -2049,7 +2053,7 @@ void ast_hint_state_changed(const char *device)
}
AST_LIST_UNLOCK(&hints);
ast_mutex_unlock(&conlock);
ast_unlock_contexts();
}
/*! \brief ast_extension_state_add: Add watcher for extension states */
@@ -2684,7 +2688,7 @@ static struct ast_context *find_context_locked(const char *context)
{
struct ast_context *c = NULL;
ast_lock_contexts();
ast_rdlock_contexts();
while ( (c = ast_walk_contexts(c)) ) {
if (!strcmp(ast_get_context_name(c), context))
return c;
@@ -2907,7 +2911,7 @@ int ast_context_lockmacro(const char *context)
struct ast_context *c = NULL;
int ret = -1;
ast_lock_contexts();
ast_rdlock_contexts();
while ((c = ast_walk_contexts(c))) {
if (!strcmp(ast_get_context_name(c), context)) {
@@ -2935,7 +2939,7 @@ int ast_context_unlockmacro(const char *context)
struct ast_context *c = NULL;
int ret = -1;
ast_lock_contexts();
ast_rdlock_contexts();
while ((c = ast_walk_contexts(c))) {
if (!strcmp(ast_get_context_name(c), context)) {
@@ -3463,7 +3467,7 @@ static char *complete_show_dialplan_context(const char *line, const char *word,
if (pos != 2)
return NULL;
ast_lock_contexts();
ast_rdlock_contexts();
wordlen = strlen(word);
@@ -3508,7 +3512,7 @@ static int show_dialplan_helper(int fd, const char *context, const char *exten,
struct ast_context *c = NULL;
int res = 0, old_total_exten = dpc->total_exten;
ast_lock_contexts();
ast_rdlock_contexts();
/* walk all contexts ... */
while ( (c = ast_walk_contexts(c)) ) {
@@ -3861,7 +3865,7 @@ static struct ast_context *__ast_context_create(struct ast_context **extcontexts
int length = sizeof(struct ast_context) + strlen(name) + 1;
if (!extcontexts) {
ast_mutex_lock(&conlock);
ast_rdlock_contexts();
local_contexts = &contexts;
} else
local_contexts = extcontexts;
@@ -3873,28 +3877,31 @@ static struct ast_context *__ast_context_create(struct ast_context **extcontexts
tmp = NULL;
}
if (!extcontexts)
ast_mutex_unlock(&conlock);
ast_unlock_contexts();
return tmp;
}
}
if (!extcontexts)
ast_unlock_contexts();
if ((tmp = ast_calloc(1, length))) {
ast_mutex_init(&tmp->lock);
ast_mutex_init(&tmp->macrolock);
strcpy(tmp->name, name);
tmp->root = NULL;
tmp->registrar = registrar;
if (!extcontexts)
ast_wrlock_contexts();
tmp->next = *local_contexts;
tmp->includes = NULL;
tmp->ignorepats = NULL;
*local_contexts = tmp;
if (!extcontexts)
ast_unlock_contexts();
if (option_debug)
ast_log(LOG_DEBUG, "Registered context '%s'\n", tmp->name);
if (option_verbose > 2)
ast_verbose( VERBOSE_PREFIX_3 "Registered extension context '%s'\n", tmp->name);
}
if (!extcontexts)
ast_mutex_unlock(&conlock);
return tmp;
}
@@ -3939,7 +3946,7 @@ void ast_merge_contexts_and_delete(struct ast_context **extcontexts, const char
in addition, the locks _must_ be taken in this order, because there are already
other code paths that use this order
*/
ast_mutex_lock(&conlock);
ast_wrlock_contexts();
AST_LIST_LOCK(&hints);
/* preserve all watchers for hints associated with this registrar */
@@ -4017,7 +4024,7 @@ void ast_merge_contexts_and_delete(struct ast_context **extcontexts, const char
}
AST_LIST_UNLOCK(&hints);
ast_mutex_unlock(&conlock);
ast_unlock_contexts();
return;
}
@@ -5289,7 +5296,6 @@ void __ast_context_destroy(struct ast_context *con, const char *registrar)
struct ast_exten *e, *el, *en;
struct ast_ignorepat *ipi;
ast_mutex_lock(&conlock);
for (tmp = contexts; tmp; ) {
struct ast_context *next; /* next starting point */
for (; tmp; tmpl = tmp, tmp = tmp->next) {
@@ -5339,12 +5345,13 @@ void __ast_context_destroy(struct ast_context *con, const char *registrar)
/* if we have a specific match, we are done, otherwise continue */
tmp = con ? NULL : next;
}
ast_mutex_unlock(&conlock);
}
void ast_context_destroy(struct ast_context *con, const char *registrar)
{
ast_wrlock_contexts();
__ast_context_destroy(con,registrar);
ast_unlock_contexts();
}
static void wait_for_hangup(struct ast_channel *chan, void *data)
@@ -6112,12 +6119,22 @@ int load_pbx(void)
*/
int ast_lock_contexts()
{
return ast_mutex_lock(&conlock);
return ast_rwlock_wrlock(&conlock);
}
int ast_rdlock_contexts(void)
{
return ast_rwlock_rdlock(&conlock);
}
int ast_wrlock_contexts(void)
{
return ast_rwlock_wrlock(&conlock);
}
int ast_unlock_contexts()
{
return ast_mutex_unlock(&conlock);
return ast_rwlock_unlock(&conlock);
}
/*