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Message-ID: <020201c0d289$81655c30$0200a8c0@lifelesswks>
From: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To: "Greg Smith" <rys AT epaibm DOT rtpnc DOT epa DOT gov>, "greg smith" <cygwin AT cygwin DOT com>
References: <3AEF04AC DOT 62D56B1B AT trex DOT rtpnc DOT epa DOT gov>
Subject: Re: loop in pthread_cond_broadcast
Date: Wed, 2 May 2001 07:55:56 +1000
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Thanks Greg,
    I'll look into a fix for this.

Rob

----- Original Message -----
From: "Greg Smith" <rys AT epaibm DOT rtpnc DOT epa DOT gov>
To: "greg smith" <cygwin AT cygwin DOT 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 AT 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 AT GREG ~
> $ gcc -o ptbarf ptbarf.c
>
> gsmith AT GREG ~
> $ ./ptbarf
> before cond wait
> before cond broadcast
> after  cond broadcast
> after  cond wait
> before cond wait
> before cond broadcast
>
> --
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>
>


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