/* Creates two threads, one printing 10000 "a"s, the other printing 10000 "b"s. Illustrates: thread creation, thread joining. */ #include <stddef.h> #include <stdio.h> #include <unistd.h> #include "pthread.h" static void *process(void * arg) { int i; printf("Starting process %s\n", (char *)arg); for (i = 0; i < 10000; i++) write(1, (char *) arg, 1); return NULL; } #define sucfail(r) (r != 0 ? "failed" : "succeeded") int main(void) { int pret, ret = 0; pthread_t th_a, th_b; void *retval; ret += (pret = pthread_create(&th_a, NULL, process, (void *)"a")); printf("create a %s %d\n", sucfail(pret), pret); ret += (pret = pthread_create(&th_b, NULL, process, (void *)"b")); printf("create b %s %d\n", sucfail(pret), pret); ret += (pret = pthread_join(th_a, &retval)); printf("join a %s %d\n", sucfail(pret), pret); ret += (pret = pthread_join(th_b, &retval)); printf("join b %s %d\n", sucfail(pret), pret); return ret; }