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Silly Darwin pthreads question

Hello, all ...

Does pthread_exit() behave differently on Darwin / Mac OS X than it does on, say, LinuxPPC, with regards to main()? As an example, consider the following:

*****************************

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

void * Hello(void *pThreadID)
{
printf("Hello %d\n", pThreadID);
pthread_exit(0);
}

int main(int argc, char *argv[])
{
pthread_t threads[5] = {0};

for (int iIndex = 0; iIndex < 5; iIndex ++)
{
printf("Creating thread %i\n", iIndex);

int iOK = pthread_create(&threads[iIndex], NULL, Hello, (void *)iIndex);

if (iOK != 0)
{
printf("error\n");
break;
}
}

pthread_exit(0);
}

***************

Now, the pthread documentation i've read indicates that, if main() exits with pthread_exit(), that it waits for all spawned threads to exit before doing the exit itself. On LinuxPPC, this seems to be the case, i.e. always see the "Hello 4" message before exiting. On Mac OS X 10.1.3, though, the last thread (Hello 4) often doesn't seem to get a chance to run before main() exits, as evidenced by the last message displayed sometimes being "Hello 3" ... no "Hello 4" anywhere.

Anyone care to explain this? I'm certainly not a pthread pro, and i'm still pretty new to Darwin, so i'm not adverse to the premise that John Knows Not What He Does ... still, this seems like a simple enough thing, i'd expect this to work equally across any platform which does pthreads ...

Regards,

John

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