Fw: loop in pthread_cond_broadcast
Robert Collins
robert.collins@itdomain.com.au
Tue May 1 14:59:00 GMT 2001
I want to get afix for this into 1.3.2 as well chris.
I can't touch it till staurday morning however :[
Rob
----- Original Message -----
From: "Greg Smith" <rys@epaibm.rtpnc.epa.gov>
To: "greg smith" <cygwin@cygwin.com>
Sent: Wednesday, May 02, 2001 4:47 AM
Subject: loop in pthread_cond_broadcast
> Below is a sample program that illustrates a loop in
pthread_cond_broadcast()
> when called the second time. CPU utilization goes to 100% and the
function
> never returns.
>
> Thanks, Greg
>
> gsmith@GREG ~
> $ cat ptbarf.c
> #include <stdio.h>
> #include <pthread.h>
>
> void *baby();
>
> pthread_cond_t cond;
> pthread_mutex_t lock;
> pthread_attr_t attr;
> pthread_t tid;
>
> int main ()
> {
> int i;
>
> pthread_cond_init(&cond, NULL);
> pthread_attr_init(&attr);
> pthread_mutex_init(&lock, NULL);
>
> pthread_mutex_lock(&lock);
> pthread_create(&tid, &attr, baby, NULL);
>
> for (i=0; i<10; i++)
> { sleep(1);
> printf("before cond wait\n");
> pthread_cond_wait(&cond, &lock);
> printf("after cond wait\n");
> }
> pthread_mutex_unlock(&lock);
> }
>
> void *baby()
> {
> while (1)
> { sleep(2);
> pthread_mutex_lock(&lock);
> printf("before cond broadcast\n");
> pthread_cond_broadcast(&cond);
> printf("after cond broadcast\n");
> pthread_mutex_unlock(&lock);
> }
> }
>
> gsmith@GREG ~
> $ gcc -o ptbarf ptbarf.c
>
> gsmith@GREG ~
> $ ./ptbarf
> before cond wait
> before cond broadcast
> after cond broadcast
> after cond wait
> before cond wait
> before cond broadcast
>
> --
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