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Perform deadlock avoidance on initial entry, too

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3343 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Spencer
2004-06-29 12:38:04 +00:00
parent 779140b94c
commit 6195ae7453
1 changed files with 17 additions and 3 deletions
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20
channel.c
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@@ -451,14 +451,28 @@ void ast_channel_undefer_dtmf(struct ast_channel *chan)
struct ast_channel *ast_channel_walk_locked(struct ast_channel *prev)
{
/* Returns next channel (locked) */
struct ast_channel *l, *ret=NULL;
struct ast_channel *l, *ret;
int retries = 0;
retry:
ret=NULL;
ast_mutex_lock(&chlock);
l = channels;
if (!prev) {
if (l)
ast_mutex_lock(&l->lock);
if (l) {
if (ast_mutex_trylock(&l->lock)) {
if (retries < 10)
ast_log(LOG_DEBUG, "Avoiding initial deadlock for '%s'\n", ret->name);
else
ast_log(LOG_WARNING, "Avoided initial deadlock for '%s', %d retries!\n", ret->name, retries);
ast_mutex_unlock(&chlock);
if (retries < 10) {
usleep(1);
retries++;
goto retry;
} else
return NULL;
}
}
ast_mutex_unlock(&chlock);
return l;
}