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linux執行程序通訊遇到問題及解決方法

1.


解決方法:新增#define _GUN_SOURCE

2.


解決方法: (1)新增相應的標頭檔案 如linux程式設計常用的四種標頭檔案:      #include<stdio.h>      #include<stdlib.h>      #include<unistd.h>      #include<sys/types.h> (2)編譯時 gcc -pthread clone clone.c

正確的程式碼:

#define _GNU_SOURCE
#include <string.h>
#include <sched.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <semaphore.h>

#include<unistd.h>
#include<sys/types.h>

int producer(void * args);
int consumer(void *args);

pthread_mutex_t mutex;
sem_t product;
sem_t warehouse;

char buffer[8][4];
int bp=0;
int main(int argc,char** argv)
{
  pthread_mutex_init(&mutex,NULL);//初始化互斥變數
   sem_init(&product,0,0);
    sem_init(&warehouse,0,8);
   int clone_flag,arg,retval;
    char *stack;
    clone_flag=CLONE_VM|CLONE_SIGHAND|CLONE_FS|    CLONE_FILES;
    int i;
     for(i=0;i<2;i++)
     {  //建立四個執行緒
        arg = i;
        stack =(char*)malloc(4096);
        retval=clone((void*)producer,&(stack[4095]),clone_flag,  (void*)&arg);
      stack =(char*)malloc(4096);
        retval=clone((void*)consumer,&(stack[4095]),clone_flag,   (void*)&arg);
    }
    exit(1);
}
int producer(void* args)
{
    int id = *((int*)args);
    int i;
    for(i=0;i<10;i++)
    {
        sleep(i+1);  //表現執行緒速度差別
        sem_wait(&warehouse);
        pthread_mutex_lock(&mutex);
        if(id==0)
            strcpy(buffer[bp],"aaa\0");
        else
            strcpy(buffer[bp],"bbb\0");
        bp++;
        printf("producer %d produce %s in %d\n",id,buffer[bp-1],bp-1);
        pthread_mutex_unlock(&mutex);
        sem_post(&product);
    }
    printf("producer %d is over!\n",id);
}
int consumer(void *args)
{
    int id = *((int*)args);
    int i;
    for(i=0;i<10;i++)
    {
        sleep(10-i);  //表現執行緒速度差別
        sem_wait(&product);
        pthread_mutex_lock(&mutex);
        bp--;
        printf("consumer %d get %s in %d\n",id,buffer[bp],bp);
        strcpy(buffer[bp],"zzz\0");
        pthread_mutex_unlock(&mutex);
        sem_post(&warehouse);
    }
    printf("consumer %d is over!\n",id);
}