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Fix race in Agents

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1173 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Spencer
2003-07-09 22:41:51 +00:00
parent e74c5226f3
commit c11f4d9df6
1 changed files with 36 additions and 8 deletions
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36
channels/chan_agent.c
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@@ -79,6 +79,7 @@ static struct agent_pvt {
pthread_mutex_t lock; /* Channel private lock */
int dead; /* Poised for destruction? */
int pending; /* Not a real agent -- just pending a match */
int abouttograb; /* About to grab */
unsigned int group; /* Group memberships */
char moh[80]; /* Which music on hold */
char agent[AST_MAX_AGENT]; /* Agent ID */
@@ -175,6 +176,21 @@ static struct agent_pvt *add_agent(char *agent, int pending)
return p;
}
static int agent_cleanup(struct agent_pvt *p)
{
struct ast_channel *chan = p->owner;
p->owner = NULL;
chan->pvt->pvt = NULL;
p->app_sleep_cond = 1;
/* Release ownership of the agent to other threads (presumably running the login app). */
ast_pthread_mutex_unlock(&p->app_lock);
if (chan)
ast_channel_free(chan);
if (p->dead)
free(p);
return 0;
}
static int check_availability(struct agent_pvt *newlyavailable, int needlock);
static int agent_answer(struct ast_channel *ast)
@@ -352,9 +368,13 @@ static int agent_hangup(struct ast_channel *ast)
agent_unlink(p);
ast_pthread_mutex_unlock(&agentlock);
}
if (p->dead)
if (p->abouttograb) {
/* Let the "about to grab" thread know this isn't valid anymore, and let it
kill it later */
p->abouttograb = 0;
} else if (p->dead) {
free(p);
else {
} else {
/* Not dead -- check availability now */
ast_pthread_mutex_lock(&p->lock);
check_availability(p, 1);
@@ -549,6 +569,7 @@ static int check_availability(struct agent_pvt *newlyavailable, int needlock)
/* We found a pending call, time to merge */
chan = agent_new(newlyavailable, AST_STATE_DOWN);
parent = p->owner;
p->abouttograb = 1;
ast_pthread_mutex_unlock(&p->lock);
break;
}
@@ -566,13 +587,20 @@ static int check_availability(struct agent_pvt *newlyavailable, int needlock)
ast_log( LOG_DEBUG, "Waited for stream, result '%d'\n", res);
}
if (!res) {
/* Note -- parent may have disappeared */
if (p->abouttograb) {
ast_setstate(parent, AST_STATE_UP);
ast_setstate(chan, AST_STATE_UP);
ast_channel_masquerade(parent, chan);
p->abouttograb = 0;
ast_hangup(chan);
} else {
ast_log(LOG_NOTICE, "Not sure this will always work..\n");
ast_hangup(chan);
ast_log(LOG_DEBUG, "Sneaky, parent disappeared in the mean time...\n");
agent_cleanup(newlyavailable);
}
} else {
ast_log(LOG_DEBUG, "Ugh... Agent hung up at exactly the wrong time\n");
agent_cleanup(newlyavailable);
}
}
return 0;