threads/119920: fork broken in libpthread

[Landon Fuller]

On Jan 31, 2008, at 10:44, Julian Elischer wrote:

> the releng 6 and releng 7 versions of this patch are at:
> http://www.freebsd.org/~julian/kse-6.diff
> and
> http://www.freebsd.org/~julian/kse-7.diff
>
> but the one for 7 is just speculative.
> I don't have a 7.x system to test.
>
> Landon, what is your test case?


Inlined below. On our 8-core 6.3 system without this patch, the fork 
() threads wedge and spin in <2 minutes. With the patch, works as  
expected.

#include <sys/types.h>
#include <unistd.h>
#include <pthread.h>

void *forker (void *arg) {
         while (1) {
                 pid_t pid = fork();
                 if (pid == 0) {
                         exit(0);
                 } else if (pid > 0) {
                         int status;
                         waitpid(pid, &status, 0);
                 } else {
                         printf("Fork failed\n");
                         abort();
                 }
         }
}

int main(void) {
         int i = 0;
         for (i = 0; i < 4; i++) {
                 pthread_t thr;
                 pthread_create(&thr, NULL, forker, NULL);
                 pthread_detach(thr);
         }

         while(1)
                 sleep(1000);
}
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