pthread_mutexattr_setrobust(3) - wariua/manpages-ko GitHub Wiki

#include <pthread.h>

int pthread_mutexattr_getrobust(const pthread_mutexattr_t *attr,
                                int *robustness);
int pthread_mutexattr_setrobust(pthread_mutexattr_t *attr,
                                int robustness);

int pthread_mutexattr_getrobust_np(const pthread_mutexattr_t *attr,
                                   int *robustness);
int pthread_mutexattr_setrobust_np(pthread_mutexattr_t *attr,
                                   int robustness);

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <pthread.h>
#include <errno.h>

#define handle_error_en(en, msg) \
               do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0)

static pthread_mutex_t mtx;

static void *
original_owner_thread(void *ptr)
{
    printf("[original owner] Setting lock...\n");
    pthread_mutex_lock(&mtx);
    printf("[original owner] Locked. Now exiting without unlocking.\n");
    pthread_exit(NULL);
}

int
main(int argc, char *argv[])
{
    pthread_t thr;
    pthread_mutexattr_t attr;
    int s;

    pthread_mutexattr_init(&attr);  /* 속성 객체 초기화 */
    pthread_mutexattr_setrobust(&attr, PTHREAD_MUTEX_ROBUST);
                                    /* 견고성 설정 */

    pthread_mutex_init(&mtx, &attr);    /* 뮤텍스 초기화 */

    pthread_create(&thr, NULL, original_owner_thread, NULL);

    sleep(2);

    /* 지금쯤 "original_owner_thread"는 끝났을 것임 */

    printf("[main thread] Attempting to lock the robust mutex.\n");
    s = pthread_mutex_lock(&mtx);
    if (s == EOWNERDEAD) {
        printf("[main thread] pthread_mutex_lock() returned EOWNERDEAD\n");
        printf("[main thread] Now make the mutex consistent\n");
        s = pthread_mutex_consistent(&mtx);
        if (s != 0)
            handle_error_en(s, "pthread_mutex_consistent");
        printf("[main thread] Mutex is now consistent; unlocking\n");
        s = pthread_mutex_unlock(&mtx);
        if (s != 0)
            handle_error_en(s, "pthread_mutex_unlock");

        exit(EXIT_SUCCESS);
    } else if (s == 0) {
        printf("[main thread] pthread_mutex_lock() unexpectedly succeeded\n");
        exit(EXIT_FAILURE);
    } else {
        printf("[main thread] pthread_mutex_lock() unexpectedly failed\n");
        handle_error_en(s, "pthread_mutex_lock");
    }
}