我在让项目工作时遇到问题，并希望有人可以提供帮助。准则如下：
你将使用 pthread包创建4个生产者线程和4个消费者线程。每个生产者线程插入 字符'X'进入大小为10,000,000个字符的缓冲区。每个消费者线程删除最近插入的 来自缓冲区的字符。然后每个线程重复该过程
到目前为止，我的代码看起来像这样：
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <semaphore.h>
#include <pthread.h>
#define N 10000000
sem_t mutex;
sem_t full;
sem_t empty;
typedef struct
{
char const* buf[N];
char in;
char out;
} bufferItems;
bufferItems sharedBuffer;
void *producer(void *arg) {
while(1) {
sem_wait(&empty);
sem_wait(&mutex);
sharedBuffer.buf[sharedBuffer.in] = "X";
sharedBuffer.in = (sharedBuffer.in+1)%N;
printf("Producer\n");
sem_post(&mutex);
sem_post(&full);
}
}
void *consumer(void *arg){
while(1){
sem_wait(&full);
sem_wait(&mutex);
sharedBuffer.buf[sharedBuffer.out] = NULL;
sharedBuffer.out = (sharedBuffer.out+1)%N;
printf("Consumer\n");
sem_post(&mutex);
sem_post(&empty);
}
}
int main(void) {
sem_init(&mutex, 0, 0);
sem_init(&full, 0, 0);
sem_init(&empty, 0, N);
pthread_t p;
pthread_t c;
// create four producer threads
for(int t=0; t<4; t++){
printf("In main: creating producer thread %d\n", t);
int err = pthread_create(&p,NULL,producer,NULL);
if (err){
printf("ERROR from pthread_create() on producer thread %d\n", err);
exit(-1);
}
}
// create four consumer threads
for(int t=0; t<4; t++){
printf("In main: creating consumer thread %d\n", t);
int err = pthread_create(&c,NULL,consumer,NULL);
if (err){
printf("ERROR; from pthread_create() on consumer thread %d\n", err);
exit(-1);
}
}
}
但是我运行时得到的输出是：
In main: creating producer thread 0
In main: creating producer thread 1
In main: creating producer thread 2
In main: creating producer thread 3
In main: creating consumer thread 0
In main: creating consumer thread 1
In main: creating consumer thread 2
In main: creating consumer thread 3
似乎子线程没有执行，或者信号量不能正常工作，因此存在死锁。任何有关如何使我的代码更好或正常工作的建议将不胜感激。