UNIX环境高级编程：线程同步之条件变量及属性

示例代码：

#include <stdio.h>  
#include <pthread.h>  
#include <unistd.h>  
      
pthread_mutex_t count_lock;  
pthread_cond_t count_nonzero;  
unsigned count = 0;  
      
void *decrement_count(void *arg)  
{  
    pthread_mutex_lock(&count_lock);  
    printf("decrement_count get count_lockn");  
    while(count == 0)  
    {  
        printf("decrement_count count == 0 n");  
        printf("decrement_count before cond_wait n");  
        pthread_cond_wait(&count_nonzero, &count_lock);  
        printf("decrement_count after cond_wait n");  
        printf("decrement_count count = %d n",count);  
    }  
      
    count = count + 1;  
    pthread_mutex_unlock(&count_lock);  
}  
      
void *increment_count(void *arg)  
{  
    pthread_mutex_lock(&count_lock);  
    printf("increment_count get count_lock n");  
    if(count == 0)  
    {  
        printf("increment_count before cond_signal n");  
        pthread_cond_signal(&count_nonzero);  
        printf("increment_count after cond_signal n");  
    }  
      
    count = count + 1;  
    printf("huangcheng n");  
    printf("increment_count count = %d n",count);  
    pthread_mutex_unlock(&count_lock);  
}  
      
int main(void)  
{  
    pthread_t tid1, tid2;  
      
    pthread_mutex_init(&count_lock, NULL);  
    pthread_cond_init(&count_nonzero, NULL);  
      
    pthread_create(&tid1, NULL, decrement_count, NULL);  
    sleep(2);  
    pthread_create(&tid2, NULL, increment_count, NULL);  
      
    sleep(10);  
    pthread_exit(0);  
      
    return 0;  
}

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