- 两个线程进行售票处理,售票一百张
cpp
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
pthread_mutex_t mutex;
int tick =100;
void * th(void* arg)
{
while(1)
{
pthread_mutex_lock(&mutex);
if(tick>0)
{
printf("%s tick:%d\n", (char*)arg,tick-- );
pthread_mutex_unlock(&mutex);
usleep(1000*100);
}
else
{
pthread_mutex_unlock(&mutex);
break;
}
}
return NULL;
}
int main(int argc, char *argv[])
{
pthread_t tid1,tid2;
pthread_mutex_init(&mutex,NULL);
pthread_create(&tid1,NULL,th,"WIN1");
pthread_create(&tid2,NULL,th,"WIN2");
pthread_join(tid1,NULL);
pthread_join(tid2,NULL);
pthread_mutex_destroy(&mutex);
return 0;
}
- 对资源的获取和释放
cpp
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <semaphore.h>
sem_t sem_MEM;
int mem[3]={0};
int get_mem()
{
sem_wait(&sem_MEM);
int i = 0 ;
for(i = 0 ;i<3;i++)
{
if(0 == mem[i])
{
mem[i] = 1;
break;
}
}
return i;
}
void relese_mem(int id)
{
mem[id] = 0 ;
sem_post(&sem_MEM);
}
void* th(void* arg)
{
int id = get_mem();
printf("get mem ,tid:%lu ,mem:%d\n" ,pthread_self(),id);
sleep(rand()%5 +1);
printf("relese mem,tid:%lu mem:%d\n",pthread_self(),id);
relese_mem(id);
return NULL;
}
int main(int argc, char *argv[])
{
int i = 0 ;
pthread_t tid[10]={0};
sem_init(&sem_MEM,0,3);
for(i = 0 ;i<10;i++)
{
pthread_create(&tid[i],NULL,th,NULL);
}
for(i=0;i<10;i++)
{
pthread_join(tid[i],NULL);
}
sem_destroy(&sem_MEM);
return 0;
}