线程练习

来源：互联网发布：iphone怎么投屏到mac 编辑：程序博客网时间：2024/06/18 17:54
/*****************************************************copyright (C), 2014-2015, Lighting Studio. Co.,     Ltd. File name：Author：Jerey_Jobs    Version:0.1    Date: Description：Funcion List: *****************************************************/#include <stdio.h>#include <pthread.h>#define BUFFER_SIZE 16struct prodcons{    int buffer[BUFFER_SIZE];    pthread_mutex_t lock;    int readpos,writepos;    pthread_cond_t notempty;    pthread_cond_t notfull;};void init(struct prodcons *b){    pthread_mutex_init(&b->lock,NULL);    pthread_cond_init(&b->notempty,NULL);    pthread_cond_init(&b->notfull,NULL);    b->readpos = 0;    b->writepos = 0;}void put(struct prodcons *b,int data){    pthread_mutex_lock(&b->lock);    if((b->writepos + 1) % BUFFER_SIZE == b->readpos)    {        pthread_cond_wait(&b->notfull,&b->lock);    }    b->buffer[b->writepos] = data;    b->writepos++;    if(b->writepos >= BUFFER_SIZE)    {        b->writepos = 0;    }    pthread_cond_signal(&b->notempty);    pthread_mutex_unlock(&b->lock);}int get(struct prodcons *b){    int data;    pthread_mutex_lock(&b->lock);    if(b->writepos == b->readpos)    {        pthread_cond_wait(&b->notempty,&b->lock);    }    data = b->buffer[b->readpos];    b->readpos++;    if(b->readpos >= BUFFER_SIZE)    {        b->readpos = 0;    }    pthread_cond_signal(&b->notfull);    pthread_mutex_unlock(&b->lock);    return data;}#define OVER -1struct prodcons buffer; void * producer(void *data){    int n;    for(n = 0;n < 20;n++)    {        printf("%d----->\n",n);        put(&buffer,n);    }    put(&buffer,OVER);    return NULL;}void * consumer(void *data){    int d;    while(1)    {        d = get(&buffer);        if(d == OVER)            break;        printf("----->%d\n",d);    }    return NULL;}int main(){    pthread_t th_a,th_b;    void *retval;    init(&buffer);    pthread_create(&th_a,NULL,producer,0);    pthread_create(&th_b,NULL,consumer,0);    pthread_join(th_a,&retval);    pthread_join(th_b,&retval);    return 0;}
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