95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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typedef struct {
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int* buffer;
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int buffer_len;
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int buffer_cap;
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pthread_mutex_t mutex;
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pthread_cond_t not_full;
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pthread_cond_t not_empty;
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} monitor_t;
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volatile monitor_t monitor;
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monitor_t* init_monitor(int buffer_cap) {
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monitor_t* monitor = malloc(sizeof(monitor_t));
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monitor->buffer = calloc(buffer_cap, sizeof(int));
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monitor->buffer_len = 0;
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monitor->buffer_cap = buffer_cap;
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pthread_mutex_init(&monitor->mutex, NULL);
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pthread_cond_init(&monitor->not_full, NULL);
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pthread_cond_init(&monitor->not_empty, NULL);
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return monitor;
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}
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void destroy_monitor(monitor_t* monitor) {
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pthread_mutex_destroy(&monitor->mutex);
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pthread_cond_destroy(&monitor->not_full);
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pthread_cond_destroy(&monitor->not_empty);
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free(monitor->buffer);
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free(monitor);
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}
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void produce(monitor_t* monitor, int item) {
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pthread_mutex_lock(&monitor->mutex);
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while (monitor->buffer_len == monitor->buffer_cap) {
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pthread_cond_wait(&monitor->not_full, &monitor->mutex);
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}
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monitor->buffer[monitor->buffer_len] = item;
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monitor->buffer_len += 1;
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pthread_cond_signal(&monitor->not_empty);
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pthread_mutex_unlock(&monitor->mutex);
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}
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int consume(monitor_t* monitor) {
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pthread_mutex_lock(&monitor->mutex);
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while (monitor->buffer_len == 0) {
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pthread_cond_wait(&monitor->not_empty, &monitor->mutex);
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}
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monitor->buffer_len -= 1;
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int item = monitor->buffer[monitor->buffer_len];
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pthread_cond_signal(&monitor->not_full);
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pthread_mutex_unlock(&monitor->mutex);
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return item;
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}
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void* producer_func(void* arg) {
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monitor_t* monitor = arg;
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for (int i = 0; i < 20; i++) {
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produce(monitor, i);
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printf("Produced item %d\n", i);
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}
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pthread_exit(NULL);
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}
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void* consumer_func(void* arg) {
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monitor_t* monitor = arg;
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for (int i = 0; i < 20; i++) {
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int item = consume(monitor);
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printf("Consumed item %d\n", item);
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}
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pthread_exit(NULL);
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}
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int main(void) {
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pthread_t thread_producer, thread_consumer;
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fprintf(stderr, "Line: %d\n", __LINE__);
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monitor_t* monitor = init_monitor(3);
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pthread_create(&thread_producer, NULL, producer_func, (void*) monitor);
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pthread_create(&thread_consumer, NULL, consumer_func, (void*) monitor);
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pthread_join(thread_producer, NULL);
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pthread_join(thread_consumer, NULL);
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destroy_monitor(monitor);
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}
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