Date: Tue, 7 Oct 2008 19:29:49 -0400
From: Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Memory leak with timer
Message-ID: <20081007232949.GA13962@ednor.casa.cgf.cx>
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On Wed, Oct 08, 2008 at 12:08:52AM +0200, Bob van Loosen wrote:
> Hi all,
>
> When using a timer I seem to be getting a memory leak.
> It eats up about 8 kilobyte per second.
>
> Here's some example code:
>
> #include <stdio.h>
> #include <pthread.h>
> #include <signal.h>
> #include <stdlib.h>
> #include <unistd.h>
>
> void nothing(){}
> void Die(char *error){perror(error); exit(1);}
>
> int main()
> {
>    struct itimerspec itimer;
>    struct sigevent sigev;
>    timer_t timer;
>    int interval = 16000;
>      itimer.it_interval.tv_sec = interval / 1000000;
>    itimer.it_interval.tv_nsec = (interval % 1000000) * 1000;
>    itimer.it_value.tv_sec = interval / 1000000;
>    itimer.it_value.tv_nsec = (interval % 1000000) * 1000;
>      sigev.sigev_notify = SIGEV_THREAD;
>    sigev.sigev_notify_attributes = 0;
>    sigev.sigev_notify_function = &nothing;
>      if (timer_create (CLOCK_REALTIME, &sigev, &timer) < 0)
>        Die("timer_create");
>
>    if (timer_settime(timer, 0, &itimer, NULL) < 0)
>        Die("timer_settime");        while(1) sleep(1);
> }

This should be fixed in the next snapshot.  If you are looking for a
workaround, specifically set the sigev_notify_attributes to
PTHREAD_CREATE_DETACHED.

cgf

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