1.5.10: Problem with SIGEV_THREAD

Bob Cousins bobcousins34@hotmail.com
Thu Jul 1 14:42:00 GMT 2004

Bob Cousins <bobcousins34 <at> hotmail.com> writes:

> I am having a problem with timer notifications using SIGEV_THREAD. I adapted 
> the sigev_thread.c program from 
> http://homepage.mac.com/dbutenhof/Threads/source.html to illustrate problem.

The problem appears to be related to the timer thread terminating. The problem 
also occurs if you use non-timer thread. The attached program illustrates this. 
If you run it and repeatedly press "return" it usually (not always) hangs when 
the child thread exits.

#include <stdio.h>
#include <pthread.h>

void *
athread (void *arg)
	sleep (1);
	printf ("exit\n");
	return NULL;

int count;
    char            cmd [1024];
    char            *pcmd;
    pthread_t       id;

    pthread_create (&id, NULL, athread, NULL);

    printf ("test>");
    while (1)
        pcmd = gets (cmd);
        if (pcmd == NULL)
            printf ("pcmd = NULL\n");
            printf ("test> %d",++count);
    return 0;

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