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@hagope hagope/pthread_join.c
Last active Aug 29, 2015

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* FILE: join.c
* This example demonstrates how to "wait" for thread completions by using
* the Pthread join routine. Threads are explicitly created in a joinable
* state for portability reasons. Use of the pthread_exit status argument is
* also shown. Compare to detached.c
* AUTHOR: 8/98 Blaise Barney
* LAST REVISED: 01/30/09
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define NUM_THREADS 8
void *BusyWork(void *t)
int i;
long tid;
double result=0.0;
tid = (long)t;
printf("Thread %ld starting...\n",tid);
for (i=0; i<10000; i++)
result = result + sin(i) * tan(i);
printf("Thread %ld done. Result = %e\n",tid, result);
pthread_exit((void*) t);
int main (int argc, char *argv[])
pthread_t thread[NUM_THREADS];
pthread_attr_t attr;
int rc;
long t;
void *status;
/* Initialize and set thread detached attribute */
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
for(t=0; t<NUM_THREADS; t++) {
printf("Main: creating thread %ld\n", t);
rc = pthread_create(&thread[t], &attr, BusyWork, (void *)t);
if (rc) {
printf("ERROR; return code from pthread_create() is %d\n", rc);
/* Free attribute and wait for the other threads */
for(t=0; t<NUM_THREADS; t++) {
rc = pthread_join(thread[t], &status);
if (rc) {
printf("ERROR; return code from pthread_join() is %d\n", rc);
printf("Main: completed join with thread %ld having a status of %ld\n",t,(long)status);
printf("Main: program completed. Exiting.\n");
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