编写一个程序，开启3个线程，这3个线程的ID分别为A、B、C，每个线程将自己的ID在屏幕上打印10遍，要求输出结果必须按ABC的顺序显示；如：ABCABC….依次递推。

/*****************************************************

copyright (C), 2014-2015, Lighting Studio. Co.,     Ltd. 

File name：

Author：Jerey_Jobs    Version:0.1    Date: 

Description：

Funcion List: 

*****************************************************/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <pthread.h>

#include <errno.h>

#define N 10

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

pthread_cond_t condA_B = PTHREAD_COND_INITIALIZER;

pthread_cond_t condB_C = PTHREAD_COND_INITIALIZER;

pthread_cond_t condC_A = PTHREAD_COND_INITIALIZER;

int flagA = 0,flagB = 0,flagC = 0;

void *th_fun1(void *arg)

{

int i = 0;

char *name = (char *)arg;

while(i < N)

{

pthread_mutex_lock(&mutex);

        flagA = 1;

pthread_cond_wait(&condC_A, &mutex);

flagA = 0;

printf("%c:%d-->%lx\n", *name, i, pthread_self());

while(!flagB)

{

pthread_mutex_unlock(&mutex);

usleep(10);

pthread_mutex_lock(&mutex);

}

pthread_cond_signal(&condA_B);

pthread_mutex_unlock(&mutex);

i++;

usleep(10);

}

flagA = 1;

}

void *th_fun2(void *arg)

{

int i = 0;

char *name = (char *)arg;

while(i < N)

{

pthread_mutex_lock(&mutex);

flagB = 1;

pthread_cond_wait(&condA_B, &mutex);

flagB = 0;

printf("%c:%d-->%lx\n",*name, i, pthread_self());

while(!flagC)

{

pthread_mutex_unlock(&mutex);

usleep(10);

pthread_mutex_lock(&mutex);

}

pthread_cond_signal(&condB_C);

pthread_mutex_unlock(&mutex);

i++;

usleep(10);

}

}

void *th_fun3(void * arg)

{

int i = 0;

char *name = (char *)arg;

while(i < N)

{

pthread_mutex_lock(&mutex);

flagC = 1;

pthread_cond_wait(&condB_C, &mutex);

flagC = 0;

printf("%c:%d-->%lx\n", *name, i, pthread_self());

while(!flagA)

{

pthread_mutex_unlock(&mutex);

usleep(10);

pthread_mutex_lock(&mutex);

}

pthread_cond_signal(&condC_A);

pthread_mutex_unlock(&mutex);

i++;

usleep(10);

}

}

int main()

{

pthread_t th1, th2, th3;

int ret = 0;

char name1 = 'A', name2 = 'B', name3 = 'C';

int *p1 = (int *) &name1;

int *p2 = (int *) &name2;

int *p3 = (int *) &name3;

ret = pthread_create(&th1, NULL, th_fun1, (void *)p1);

if(ret)

{

printf("create th_fun1 error!\n");

return 1;

}

usleep(10);

ret = pthread_create(&th2, NULL, th_fun2, (void *)p2);

if(ret)

{

printf("create th_fun2 error!\n");

return 1;

}

usleep(10);

ret = pthread_create(&th3, NULL, th_fun3, (void *)p3);

if(ret)

{

printf("create th_fun3 error!\n");

return 1;

}

   

pthread_cond_broadcast(&condC_A);

pthread_join(th1, NULL);

printf("th1 finished!\n");

pthread_join(th2, NULL);

printf("th2 finished!\n");

pthread_join(th3, NULL);

printf("th3 finished!\n");

    return 0;

}