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Date: Tue, 28 Apr 1998 15:11:31 -0400
Message-Id: <199804281911.PAA09285@pluto.npiww.com>
From: Dong Liu <dliu@npiww.com>
To: ralf@uni-koblenz.de
Cc: linux@cthulhu.engr.sgi.com
Subject: Re: glibc problem
In-Reply-To: <19980428013350.27295@uni-koblenz.de>
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ralf@uni-koblenz.de writes:
 > On Mon, Apr 27, 1998 at 07:37:42PM -0400, Dong Liu wrote:
 > 
 > > Sorry, I didn't install it properly, now my program links, but it
 > > still give segementation fault.
 > 
 > Ok.  I have to admit that I never tested any kind of multithread application.
 > If you could provide the code for the program in question, that'd be
 > helpful.
 > 
 >   Ralf
 > 

How about this

---- create-thread.c----

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

void* new_thread(void* arg)
{
	int i;
	printf("Thread[%s] stack at %x\n",arg, &i);
	for (i = 0; i< 4; i++) {
	    printf("Thread[%s] %d\n", arg, i);
	    sched_yield();
	}
	return(NULL);
}

#define NUM_OF_THREAD 100
main(int argc, char **argv)

{
        int num = NUM_OF_THREAD;
	pthread_t thread[NUM_OF_THREAD];
	
	char *args[NUM_OF_THREAD];
	int i;
	int last;
	void *status;

	if (argc > 1)
	    num = atoi(argv[1]);
	if (num>100)
	    num = 100;
	printf("Original thread stack at %x\n", &i);

	for (i = 0 ; i < num; i++) {
	    args[i] = (char *)malloc(80);
	    sprintf(args[i], "%04d", i);
	    if (pthread_create(&thread[i],
			       NULL,
			       new_thread, (void *)args[i])) {
		printf("Error: creating new thread[%d]\n", i);
		break;
	    }
	}

	last = i;

	for (i = 0 ; i < last; i++) {
	    pthread_join(thread[i], &status);
	    printf("thread[%d] return status' address %p\n",i, status);
	}
	printf("%d threads created\n", last);
	exit(0);
}