Linux多線程中互斥鎖和條件變數的使用(源碼)

 Linux多線程中互斥鎖和條件變數的使用
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>

pthread_mutex_t count_lock;
pthread_cond_t count_nonzero;
unsigned count;
void *decrement_count(void *arg)
{
        pthread_mutex_lock(&count_lock);
        while (count == 0)
                pthread_cond_wait(&count_nonzero, &count_lock);
        count = count - 1;
        printf("LINE:%d %d/n", __LINE__, count);
        pthread_mutex_unlock(&count_lock);
        pthread_exit(NULL);
}

void *increment_count(void *arg)
{
        pthread_mutex_lock(&count_lock);
        if (count == 0)
                pthread_cond_signal(&count_nonzero);
        count = count + 1;

        printf("LINE:%d %d/n", __LINE__, count);
        sleep(2);
        pthread_mutex_unlock(&count_lock);
        pthread_exit(NULL);
}

int main()
{
        pthread_t id1;
        pthread_mutex_init(&count_lock, NULL);
        pthread_cond_init(&count_nonzero, NULL);

        pthread_create(&id1, NULL, decrement_count, NULL);

        increment_count(NULL);

        pthread_join(id1, NULL);
        return 0;
}