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60 lines
1.6 KiB
60 lines
1.6 KiB
#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <semaphore.h>
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#include <time.h> /* time() */
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int n=10, in=0,out=0,buffer[10];
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sem_t empty,full;
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sem_t p_mutex,s_mutex;
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void* producer(void *arg){
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int tag= pthread_self()%100;
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int nextPro;
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srand(time(NULL)+tag);
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while(1){
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nextPro = rand()%97;
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sem_wait(&p_mutex);
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sem_wait(&empty);
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buffer[in] = nextPro;
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printf("production:%d %d %d\n",nextPro,buffer[in],in);
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usleep(1000*1000/20);
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in = (in+1)%n;
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sem_post(&full);
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usleep(1000*1000/2);
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sem_post(&p_mutex);
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}
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}
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void* consumer(void *arg) {
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int item;
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while(1){
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sem_wait(&full);
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sem_wait(&s_mutex);
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item = buffer[out];
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sem_post(&empty);
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printf("consume:%d %d\n",buffer[out],out);
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out = (out+1)%n;
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usleep(1000*1000/10);
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sem_post(&s_mutex);
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}
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}
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int main() {
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pthread_t tid[2];
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//初始有10个缓冲区
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sem_init( &empty, 0,10);
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sem_init( &full, 0,0);
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sem_init(&p_mutex,0,1);
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sem_init(&s_mutex,0,1);
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for(int i=0;i<6;i++){
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pthread_create(&tid[i], NULL, producer, NULL);
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}
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pthread_create(&tid[7], NULL, consumer, NULL);
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pthread_create(&tid[8], NULL, consumer, NULL);
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pthread_create(&tid[9], NULL, consumer, NULL);
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pthread_create(&tid[10], NULL, consumer, NULL);
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pthread_create(&tid[11], NULL, consumer, NULL);
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for(int i = 0; i < 11; i++)
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pthread_join(tid[i], NULL);
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printf("main is over\n");
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}
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