多线程同步之互斥量

    谈到多线程编程，同步是一定要讲的。给个例子：

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
int count = 0;
#define N 100000
void* fun()
{
    int i;
    for (i = 0; i < N; ++i)
    {
        int tmp = count;
        tmp++;
        count = tmp;
    }
}

int main()
{
    pthread_t tid1, tid2;
    int ret1, ret2;
    ret1 = pthread_create(&tid1, NULL, fun, NULL);
    ret2 = pthread_create(&tid2, NULL, fun, NULL);
    pthread_join(tid1, NULL);
    pthread_join(tid2, NULL);
    printf("count = %d\n", count);
    return 0;
}

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