互斥锁和条件变量在实际开发中的应用

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//互斥锁和条件变量实际开发中应用

//下面是游戏的注册、登陆、玩游戏、停止、退出

#include <stdio.h>

#include <pthread.h>

#include <unistd.h>

#include <string.h>

#include <stdlib.h>

#define USER_REGISTER 1

#define USER_LOGIN 2

#define USER_PLAY 3

#define USER_QUIT 4

#define USER_STOP 5

//1.互斥锁定义

pthread_mutex_t register_lock;

pthread_mutex_t login_lock;

pthread_mutex_t play_lock;

//条件变量定义

pthread_cond_t register_cond;

pthread_cond_t login_cond;

pthread_cond_t play_cond;

int flag = 0;

pthread_t tid[3] = {0};

//2.互斥锁的初始化

void init_pthread_lock()

{

pthread_mutex_init(&register_lock,NULL);

pthread_mutex_init(&login_lock,NULL);

pthread_mutex_init(&play_lock,NULL);

return;

}

//条件变量出始化

void init_pthread_cond()

{

pthread_cond_init(&register_cond,NULL);

pthread_cond_init(&login_cond,NULL);

pthread_cond_init(&play_cond,NULL);

return;

}

void *thread_register(void *arg)

{

while(1)

{

pthread_mutex_lock(&register_lock);//上锁

pthread_cond_wait(&register_cond,&register_lock);//等待信号

pthread_mutex_unlock(&register_lock);//解锁

while(flag)

{

puts("----------register-------------");

sleep(1);

}

void *thread_login(void* arg)

{

while(1)

{

pthread_mutex_lock(&login_lock);

pthread_cond_wait(&login_cond,&login_lock);

pthread_mutex_unlock(&login_lock);

while(flag)

{

puts("-----------login---------------");

sleep(1);

}

void *thread_play(void *arg)

{

while(1)

{

pthread_mutex_lock(&play_lock);

pthread_cond_wait(&play_cond,&play_lock);

pthread_mutex_unlock(&play_lock);

while(flag)

{

puts("-----------play--------------");

sleep(1);

}

void create_thread()

{

int ret = 0;

ret = pthread_create(&tid[0],NULL,thread_register,NULL);

if(ret != 0)

{

fprintf(stderr,"fail to pthread_create:%s\n",strerror(ret));

exit(EXIT_FAILURE);

}

ret = pthread_create(&tid[1],NULL,thread_login,NULL);

if(ret != 0)

{

fprintf(stderr,"fail to pthread_create:%s\n",strerror(ret));

exit(EXIT_FAILURE);

}

ret = pthread_create(&tid[2],NULL,thread_play,NULL);

if(ret != 0)

{

fprintf(stderr,"fail to pthread_create:%s",strerror(ret));

exit(EXIT_FAILURE);

}

int main(int argc, const char *argv[])

{

int cmd = 0,i = 0;

init_pthread_lock();

init_pthread_cond();

create_thread();

while(1)

{

printf("please input [1-5] select [register,login,game,quit,stop:\n");

scanf("%d",&cmd);

//getchar();

switch(cmd)

{

case USER_REGISTER:

flag = 1;

pthread_cond_signal(&register_cond);//发送信号

break;

case USER_LOGIN:

flag = 1;

pthread_cond_signal(&login_cond);

break;

case USER_PLAY:

pthread_cond_signal(&play_cond);

flag = 1;

break;

case USER_QUIT:

goto loop;

break;

case USER_STOP:

flag = 0;

break;

}

loop:

for(i = 0;i < 3;i++)

{

pthread_cancel(tid[i]);

}

printf("GAME OVER!\n");

pthread_join(tid[0],NULL);

pthread_join(tid[1],NULL);

pthread_join(tid[2],NULL);

exit(EXIT_SUCCESS);

return 0;

}

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