操作系统 基于clone()系统调用

#include "sched.h"
#include "pthread.h"
#include "stdio.h"
#include "stdlib.h"
#include "semaphore.h"
#include "string.h"

int producer(void *args);
int consumer(void *args);
pthread_mutex_t mutex ; // a mutex
sem_t product; //semaphore
sem_t warehouse;

char buffer[8][4];
int bp=0;

int main(int argc ,char **argv)
{
pthread_mutex_init(&mutex,NULL);
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++)
{
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);
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);
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);
}

编译的时候需要输入参数

gcc -pthread