Merged revisions 42133 via svnmerge from

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. 


........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@43307 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_agent.c

@@ -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;
 }