今天再一次看了下Linux多線程的知識。看了看代碼是怎麼實現的，很high。再詳細的看一下這幾段代碼
關於線程很細致的解釋百度百科上寫的相當好了。有時間我還得看幾遍。地址：百度百科--Linux多線程
/*
*生產者消費者問題的多線程互斥控制，源程序出自《Linux網絡編程》
*/
#include <stdio.h>
#include <pthread.h>
#include <sched.h>
void *producter_f(void *arg);
void *consumer_f(void *arg);
int buffer_has_item = 0; /*設置緩存數量*/
pthread_mutex_t mutex; /*設置互斥*/
int running = 1;
int main (void)
{
pthread_t consumer_t; /*線程參數*/
pthread_t producter_t;
/*不知道這句為什麼不給我變藍色，初始化互斥*/
pthread_mutex_init(&mutex, NULL);
/*創建線程*/
pthread_create(&producter_t, NULL, (void *)producter_f, NULL);
pthread_create(&consumer_t, NULL, (void *)consumer_f, NULL);
usleep(1);
running = 0;
/*等待線程退出，一個線程不能夠被多個線程等待*/
pthread_join(consumer_t, NULL);
pthread_join(producter_t, NULL);
/*銷毀互斥*/
pthread_mutex_destroy(&mutex);
return 0;
}
void *producter_f(void *arg)
{
while (running)
{
pthread_mutex_lock(&mutex); /*加鎖，進入互斥區*/
buffer_has_item++;
printf("product ,num:%d\n", buffer_has_item);
pthread_mutex_unlock(&mutex); /*解鎖，離開互斥區*/
}
}
void *consumer_f(void *arg)
{
while (running)
{
pthread_mutex_lock(&mutex);
buffer_has_item--;
printf("consumer,num:%d\n",buffer_has_item);
pthread_mutex_unlock(&mutex);
}
}
/*
*生產者消費者問題的信號量控制，可以與上述程序進行對比，出處--同上
*/
#include <stdio.h>
#include <pthread.h>
#include <semaphore.h>
void *producter_f(void *arg);
void *consumer_f(void *arg);
sem_t sem;
int running = 1;
int main (void)
{
pthread_t consumer_t;
pthread_t producter_t;
sem_init(&sem, 0, 16); /*信號量初始化*/
pthread_create(&producter_t, NULL, (void*)producter_f, NULL);
pthread_create(&consumer_t, NULL, (void *)consumer_f, NULL);
sleep(1);
running = 0;
pthread_join(consumer_t, NULL);
pthread_join(producter_t, NULL);
sem_destroy(&sem); /*銷毀信號量*/
return 0;
}
void *producter_f(void *arg)
{
int semval = 0; /*信號量的初始值*/
while (running)
{
usleep(1);
sem_post(&sem); /*信號量+1*/
sem_getvalue(&sem, &semval);/*得到信號量的值*/
printf("pro,num:%d\n",semval);
}
}
void *consumer_f(void *arg)
{
int semval = 0;
while (running)
{
usleep(1);
sem_wait(&a12下一頁