c thread

gistfile1.txt

#include <pthread.h>
#include <stdio.h>
#include <sys/time.h>
#include <string.h>
#define MAX 100000000
pthread_t thread[2];
pthread_mutex_t mut;
void *thread1()
{

	int numberone=0;
	int i;
	printf ("thread1 : I'm thread 1\n");
	for (i = 0; i < MAX; i++)
	{
		//pthread_mutex_lock(&mut);
		numberone++;
		//pthread_mutex_unlock(&mut);
	}
	pthread_exit(NULL);
}
void *thread2()
{
	int numbertwo=0;
	int i;
	printf("thread2 : I'm thread 2\n");
	for (i = 0; i < MAX; i++)
	{
		numbertwo++;
	}
	pthread_exit(NULL);
}
void thread_create(void)
{
	int temp;
	memset(&thread, 0, sizeof(thread)); 
	/*创建线程*/
	if((temp = pthread_create(&thread[0], NULL, thread1, NULL)) != 0)  
		printf("线程1创建失败!\n");
	else
		printf("线程1被创建\n");
	if((temp = pthread_create(&thread[1], NULL, thread2, NULL)) != 0) 
		printf("线程2创建失败");
	else
		printf("线程2被创建\n");
}
void thread_wait(void)
{
	/*等待线程结束*/
	if(thread[0] !=0) {                  
		pthread_join(thread[0],NULL);
		printf("线程1已经结束\n");
	}
	if(thread[1] !=0) {                
		pthread_join(thread[1],NULL);
		printf("线程2已经结束\n");
	}
}
int main()
{
	struct timeval starttime,endtime;
	gettimeofday(&starttime,NULL);
	/*用默认属性初始化互斥锁*/

	pthread_mutex_init(&mut,NULL);
	printf("主函数\n");
	thread_create();
	thread_wait();
	gettimeofday(&endtime,NULL);
	int timeuse = 1000000 * (endtime.tv_sec -starttime.tv_sec) + endtime.tv_usec - starttime.tv_usec;
	printf("总共时间:%d",timeuse);
	return 0;
}



➜  cl  ./function 
thread1 : I'm thread 1
thread2 : I'm thread 2
总共时间:399066                                                                                                                                                                                            ➜  cl  gcc thread.c -lpthread -o thread
➜  cl  ./thread
主函数
线程1被创建
线程2被创建
thread1 : I'm thread 1
thread2 : I'm thread 2
线程1已经结束
线程2已经结束
总共时间:221633     

numberone,numbertwo 定义为global 时:
主函数
线程1被创建
线程2被创建
thread1 : I'm thread 1
thread2 : I'm thread 2
线程1已经结束
线程2已经结束
总共时间:722538