子线程循环 3 次，接着主线程循环 6 次，接着又回到子线程循环 3 次，接着再回到主线程又循环6 次，如此循环50次，试写出代码。
程序:
#include <stdio.h> #include <stdlib.h> #include <pthread.h> pthread_mutex_t mutex; pthread_cond_t cond; int main_flog = 0; int sub_flog = 0; int main_count = 0; int sub_count = 0; void *sub_thread_func(void *argv); void main_thread_func(); int main() { pthread_t tid; int ret; pthread_mutex_init(&mutex,NULL); pthread_cond_init(&cond,NULL); ret = pthread_create(&tid,NULL,sub_thread_func,NULL); if(ret == -1) { perror("pthread_create errpr!\n"); exit(-1); } main_thread_func(); ret = pthread_join(tid,NULL); if(ret == -1) { printf("pthread_join error!\n"); exit(-1); } return 0; } void *sub_thread_func(void *argv) { int i; while(1) { sub_count++; for(i = 1; i <= 3; i++) { printf("sub pthread%d:%d\n",sub_count,i); } while(1) { pthread_mutex_lock(&mutex); if(main_flog == 1) { pthread_cond_signal(&cond); pthread_mutex_unlock(&mutex); break; } pthread_mutex_unlock(&mutex); } pthread_mutex_lock(&mutex); sub_flog = 1; pthread_cond_wait(&cond,&mutex); sub_flog = 0; pthread_mutex_unlock(&mutex); //sub_count++; if(sub_count >= 50) { printf("sub_pthread loop 50 times!\n"); break; } } return (void *)0; } void main_thread_func(void) { int i; while(1) { main_count++; pthread_mutex_lock(&mutex); main_flog = 1; pthread_cond_wait(&cond,&mutex); main_flog = 0; pthread_mutex_unlock(&mutex); for(i = 1; i <= 6; i++) { printf("main phread%d:%d\n",main_count,i); } while(1) { pthread_mutex_lock(&mutex); if(sub_flog == 1) { pthread_cond_signal(&cond); pthread_mutex_unlock(&mutex); break; } pthread_mutex_unlock(&mutex); } //main_count++; if(main_count >= 50) { printf("main_phread loop 50 times!\n"); break; } } }
