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Merged revisions 42133 via svnmerge from

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https://origsvn.digium.com/svn/asterisk/branches/1.2

........
r42133 | bweschke | 2006-09-06 14:16:41 -0400 (Wed, 06 Sep 2006) | 6 lines

 Look ma! No more deadlocks! <sic>

 As posted from #7458 and others similar to it in Mantis:
 p->app_lock was a mutex really designed for use with agents not in callback mode. That being the case, I've tried to code it so that when callback mode is used, the app_lock mutex will not be locked/unlocked at all. Please let me know how you make out - and if you continue to deadlock now, please reproduce the deadlock logging information and post to Mantis. 


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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@43307 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
BJ Weschke
2006-09-20 03:51:01 +00:00
parent 02868b1723
commit e8606d9c57
1 changed files with 16 additions and 3 deletions
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19
channels/chan_agent.c
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@@ -815,7 +815,8 @@ static int agent_hangup(struct ast_channel *ast)
ast_mutex_unlock(&p->lock);
}
/* Release ownership of the agent to other threads (presumably running the login app). */
ast_mutex_unlock(&p->app_lock);
if (ast_strlen_zero(p->loginchan))
ast_mutex_unlock(&p->app_lock);
}
return 0;
}
@@ -955,7 +956,7 @@ static struct ast_channel *agent_new(struct agent_pvt *p, int state)
* implemented in the kernel for this.
*/
p->app_sleep_cond = 0;
if(ast_mutex_trylock(&p->app_lock)) {
if(ast_strlen_zero(p->loginchan) && ast_mutex_trylock(&p->app_lock)) {
if (p->chan) {
ast_queue_frame(p->chan, &ast_null_frame);
ast_mutex_unlock(&p->lock); /* For other thread to read the condition. */
@@ -971,7 +972,20 @@ static struct ast_channel *agent_new(struct agent_pvt *p, int state)
ast_mutex_unlock(&p->app_lock);
return NULL;
}
} else if (!ast_strlen_zero(p->loginchan)) {
if (p->chan)
ast_queue_frame(p->chan, &ast_null_frame);
if (!p->chan) {
ast_log(LOG_WARNING, "Agent disconnected while we were connecting the call\n");
p->owner = NULL;
tmp->tech_pvt = NULL;
p->app_sleep_cond = 1;
ast_channel_free( tmp );
ast_mutex_unlock(&p->lock); /* For other thread to read the condition. */
return NULL;
}
}
ast_indicate(p->chan, AST_CONTROL_UNHOLD);
p->owning_app = pthread_self();
/* After the above step, there should not be any blockers. */
if (p->chan) {
@@ -979,7 +993,6 @@ static struct ast_channel *agent_new(struct agent_pvt *p, int state)
ast_log( LOG_ERROR, "A blocker exists after agent channel ownership acquired\n" );
CRASH;
}
ast_indicate(p->chan, AST_CONTROL_UNHOLD);
}
return tmp;
}