这是一个基本的问题。仔细看看man pages，应该就可以理解其中的道理。不过我看到的几个man pages的详略程度有所不同。关键的函数是pthread_cleanup_push()和pthread_cleanup_pop()以及由此衍生出来的xxx_np（不可移植版本）。 更详细的信息可以参考NPTL的代码：http://code.metager.de/source/xref/gnu/glibc/nptl/pthread_cond_wait.c $ cat pthread.cc /*

• See man page for the details.
• See the following link, too.
• https://computing.llnl.gov/tutorials/pthreads/man/pthread_cleanup_push.txt *
• $ g++ -Wall -pthread pthread.cc */ #include #include #include #include #include

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; pthread_cond_t cond = PTHREAD_COND_INITIALIZER; int condition = 1; int count = 0; int unlock = 1;

void cleanup_handler(void *arg) {   printf(“Called clean-up handler\n”);   if (unlock)   {     int rc = pthread_mutex_unlock(&mutex);     printf(“cleanup_handler.rc=%d\n”, rc);   } }

void * produce(void *arg) {   pthread_cleanup_push(cleanup_handler, NULL);

  while(1)   {     pthread_mutex_lock( &mutex );     while( condition == 1)       pthread_cond_wait( &cond, &mutex );     printf(“Produced %d\n”, count++);     pthread_mutex_unlock( &mutex );   }

  pthread_cleanup_pop(0);   return( 0 ); }

void usage(void) {   printf(“Usage: ./a.out \n");   printf("       unlock_or_not is 1 or 0.\n");   exit(1); }

int main(int argc, char *argv[]) {    if (argc != 2)      usage();

   if (strcmp(argv[1], “1”) == 0)      unlock = 1;    else if (strcmp(argv[1], “0”) == 0)      unlock = 0;    else      usage();

   pthread_t thd_produce;    pthread_create(&thd_produce, NULL, &produce, NULL );    sleep(1);    pthread_cancel(thd_produce);    pthread_join(thd_produce, NULL);    int rc = pthread_mutex_destroy(&mutex);    printf(“rc=%d\n”, rc);    return 0; }