85 lines
1.5 KiB
C
85 lines
1.5 KiB
C
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#include<pthread.h>
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#include<semaphore.h>
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#include<stdio.h>
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#include<stdlib.h>
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#include<unistd.h>
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#define EMPTY -100
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struct args {
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sem_t buf_sem;
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int* buffer;
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int buf_length;
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pthread_mutex_t buf_lock;
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};
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void put(struct args* a, int item) {
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pthread_mutex_lock(&a->buf_lock);
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a->buf_length += 1;
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a->buffer = reallocarray(a->buffer, a->buf_length, sizeof(int));
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a->buffer[a->buf_length - 1] = item;
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pthread_mutex_unlock(&a->buf_lock);
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}
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int get(struct args* a) {
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int item;
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pthread_mutex_lock(&a->buf_lock);
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if (a->buf_length > 0) {
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item = EMPTY;
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} else {
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item = a->buffer[0];
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a->buf_length -= 1;
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a->buffer += 1;
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}
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pthread_mutex_unlock(&a->buf_lock);
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return item;
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}
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void *producer(void *arg) {
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struct args* a = arg;
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for (int i = 0; i < 100; i++) {
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put(a, i);
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sem_post(&a->buf_sem);
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}
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sleep(10);
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for (int i = 0; i < 100; i++) {
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put(a, i);
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sem_post(&a->buf_sem);
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}
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return NULL;
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}
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void* consumer(void* arg) {
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struct args* a = arg;
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while (1) {
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sem_wait(&a->buf_sem);
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int tmp = get(a);
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printf("%d\n", tmp);
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}
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return NULL;
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}
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struct args* make_args() {
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struct args* a = malloc(sizeof(struct args));
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sem_init(&a->buf_sem, 0, 1);
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pthread_mutex_init(&a->buf_lock, NULL);
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a->buffer = calloc(0, sizeof(int));
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a->buf_length = 0;
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return a;
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}
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int main(void) {
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struct args* a = make_args();
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pthread_t p1, p2, p3;
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}
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