/*
 * time :2008.4.30
 * author:will cao
 * Email:sei_michael@126.com
 * 探索自旋锁与信号量的区别
 */
#include<pthread.h>
#include<stdio.h>

pthread_t thread[2];
pthread_spinlock_t lock ;

#define MAX 10

int number=0,i;

void * thread1()
{
    printf ("thread 1 :I began to run !");
    for(i=0;i<MAX;i++)
    {
        printf("thread 1 :number=%d \n",number);
        pthread_spin_lock(&lock);
        number++;
        pthread_spin_unlock(&lock);
    }
    printf("ok ,I am over !\n");
    pthread_exit(NULL);
}
void * thread2 ()
{
    printf("thread2 : I start !!!\n");
    for(i=0;i<MAX;i++)
    {
        printf("thread2 : number = %d \n",number);
        pthread_spin_lock(&lock);
        number++;
        pthread_spin_unlock(&lock);
    }
    printf("thread 2: I am over!!!");
    pthread_exit(NULL);
}

void thread_create(void)
{
    /*create the threads */
    pthread_create(&thread[0],NULL,thread1,NULL);
    printf("create the thread 1\n ");
    pthread_create(&thread[1],NULL,thread2,NULL);
    printf("create the thread 2 \n");
}
void thread_wait(void )
{
    /*wait for the thread to be over */
    pthread_join(thread[0],NULL);
    printf("the thread 1 is over !\n");
    pthread_join(thread[1],NULL);
    printf("the thread 2 is over ! \n");
}
int main()
{
    /* init the spin lock */
    pthread_spin_init(&lock,0);
    printf("i am the main,and I am creating the threads ");
    thread_create();
    printf("i am the main,and I am wait for the thread to be over!");
    thread_wait();
}

i am the main,and I am creating the threads thread 1 :I began to run !thread 1 :number=0
thread 1 :number=1
thread 1 :number=2
thread 1 :number=3
thread 1 :number=4
thread 1 :number=5
thread 1 :number=6
thread 1 :number=7
thread 1 :number=8
thread 1 :number=9
ok ,I am over !
create the thread 1
 thread2 : I start !!!
create the thread 2
i am the main,and I am wait for the thread to be over!thread2 : number = 10
thread2 : number = 11
thread2 : number = 12
thread2 : number = 13
thread2 : number = 14
thread2 : number = 15
thread2 : number = 16
thread2 : number = 17
thread2 : number = 18
thread2 : number = 19
thread 2: I am over!!!the thread 1 is over !
the thread 2 is over !