61 lines
1000 B
C
61 lines
1000 B
C
#include <stdio.h>
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#include <unistd.h>
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#include <pthread.h>
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#include "common.h"
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#include "common_threads.h"
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//
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// Simple sync "object"
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//
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typedef struct {
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pthread_cond_t c;
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pthread_mutex_t m;
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int done;
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} synchronizer_t;
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synchronizer_t s;
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void sync_init(synchronizer_t *s) {
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s->done = 0;
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Mutex_init(&s->m);
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Cond_init(&s->c);
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}
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void sync_signal(synchronizer_t *s) {
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Mutex_lock(&s->m);
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s->done = 1;
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Cond_signal(&s->c);
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Mutex_unlock(&s->m);
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}
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void sync_wait(synchronizer_t *s) {
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Mutex_lock(&s->m);
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while (s->done == 0)
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Cond_wait(&s->c, &s->m);
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s->done = 0; // reset for next use
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Mutex_unlock(&s->m);
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}
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//
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// Main threads
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//
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void *child(void *arg) {
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printf("child\n");
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sleep(1);
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sync_signal(&s);
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return NULL;
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}
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int main(int argc, char *argv[]) {
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pthread_t p;
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printf("parent: begin\n");
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sync_init(&s);
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Pthread_create(&p, NULL, child, NULL);
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sync_wait(&s);
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printf("parent: end\n");
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return 0;
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}
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