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freetdm: only notify interrupt waiters if there is not a notification already pending

This commit is contained in:
Moises Silva 2010-09-02 12:38:43 -04:00
parent e4b5c49fc1
commit cd0cc2e4a3
1 changed files with 13 additions and 3 deletions
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16
libs/freetdm/src/ftdm_threadmutex.c
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@ -376,9 +376,19 @@ FT_DECLARE(ftdm_status_t) ftdm_interrupt_signal(ftdm_interrupt_t *interrupt)
}
#else
int err;
if ((err = write(interrupt->writefd, "w", 1)) != 1) {
ftdm_log(FTDM_LOG_ERROR, "Failed to signal interrupt: %s\n", errno, strerror(errno));
return FTDM_FAIL;
struct pollfd testpoll;
testpoll.revents = 0;
testpoll.events = POLLIN;
testpoll.fd = interrupt->readfd;
err = poll(&testpoll, 1, 0);
if (err == 0 && !(testpoll.revents & POLLIN)) {
/* we just try to notify if there is nothing on the read fd already,
* otherwise users that never call interrupt wait eventually will
* eventually have the pipe buffer filled */
if ((err = write(interrupt->writefd, "w", 1)) != 1) {
ftdm_log(FTDM_LOG_ERROR, "Failed to signal interrupt: %s\n", errno, strerror(errno));
return FTDM_FAIL;
}
}
#endif
return FTDM_SUCCESS;