thmutex.c

嵌入式linux学习之uclinux多线程编程实例 （测试平台S3C44B0X,uclinux系统）

#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

void pthread1(void *counter);
void pthread2(void *counter);

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
int Gnum = 0;


int main(void)
{
	
	pthread_t thid1, thid2;

	pthread_create(&thid1, NULL, (void*)pthread1, (void*)&g1);
	pthread_create(&thid2, NULL, (void*)pthread2, (void*)&g2);
	pthread_join(thid2, NULL);
	pthread_join(thid1, NULL);
    	

}

void pthread1(void *counter)
{
	pthread_mutex_lock(&mutex);
	while(Gnum < 5){
		Gnum++;
		printf("pthread1 counter %d\n", Gnum);
		sleep(1);
	}
	pthread_mutex_unlock(&mutex);

	pthread_mutex_lock(&mutex);
	while(Gnum < 15){
		Gnum++;
		printf("pthread1 counter %d\n", Gnum);
		sleep(1);
	}
	pthread_mutex_unlock(&mutex);

}

void pthread2(int *counter)
{
	pthread_mutex_lock(&mutex);
	while(Gnum < 10){
		Gnum++;
		printf("pthread2 counter %d\n", Gnum);
	}
	pthread_mutex_unlock(&mutex);

	pthread_mutex_lock(&mutex);
	while(Gnum < 20){
		Gnum++;
		printf("pthread2 counter %d\n", Gnum);
	}
	pthread_mutex_unlock(&mutex);

}