#include <stdio.h>
#include <pthread.h>
 
pthread_mutex_t mutex;
pthread_cond_t cond;

void *thread1(void *arg)
{
    pthread_cleanup_push(pthread_mutex_unlock,&mutex);
    //提供函數回調保護
    while(1){
        printf("thread1 is running\n");
        pthread_mutex_lock(&mutex);
        pthread_cond_wait(
 
&cond,&mutex);
        printf("thread1 applied the condition\n");
        pthread_mutex_unlock(&mutex);
        sleep(4);
    }
    pthread_cleanup_pop(0);
}

void *thread2(void *arg)
{
    while(1){
        printf("thread2 is running\n");
        pthread_mutex_lock(&mutex);
        pthread_cond_wait(
 
&cond,&mutex);
        printf("thread2 applied the condition\n");
        pthread_mutex_unlock(&mutex);
        sleep(1);
    }
}

int main()
{
    pthread_t thid1,thid2;
    printf("condition variable study!\n");
    pthread_mutex_init(&mutex,NULL);
    pthread_cond_init(&cond,NULL);
    pthread_create(
 
&thid1,NULL,(void*)thread1,NULL);
    pthread_create(&thid2,NULL,(void*)thread2,NULL);
    do{
        pthread_cond_signal(&cond);
    }while(1);
    
    sleep(20);
    pthread_exit(0);
    return 0;
}

Makefile

CC=gcc #arm-linux-gnueabihf-gcc
CFLAGS=-Wall 

TARGET=pthread-test
SRCS = pthread-test.c
# INC = -I/home/gaorong/workspace/coreboard/kernel_4.1.6/include


OBJS=$(SCR:.c=.o)

$(TARGET):$(SRCS)
    $(CC) $(FLAGS) -pthread -o $@ $^

clean:
    rm -rf $(TARGET) *.o *~

[pthread]Linux C 多線程簡單示例