Created
April 1, 2020 15:12
-
-
Save rdnt/7636cec11225f14e050f0bd206bab8f1 to your computer and use it in GitHub Desktop.
Producer/Consumer C pthreads
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// Producer / consumer example | |
// build with `cls && gcc -O2 -Wall -pthread main.c -o main.exe && main.exe` | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <pthread.h> | |
#define MESSAGES 20 | |
// global integer buffer | |
int global_buffer; | |
pthread_mutex_t buffer_mutex = PTHREAD_MUTEX_INITIALIZER; | |
// producer thread function | |
void *producer_thread(void *args) { | |
int i = 0; | |
// send messages while received count < MESSAGES | |
while (i < MESSAGES) { | |
// lock mutex | |
pthread_mutex_lock(&buffer_mutex); | |
if (global_buffer == 0) { | |
global_buffer++; | |
printf("Producer: SEND %d\n", i); | |
i++; | |
} | |
// unlock mutex | |
pthread_mutex_unlock(&buffer_mutex); | |
} | |
pthread_exit(NULL); | |
return 0; | |
} | |
// receiver thread function | |
void *consumer_thread(void *args) { | |
int i = 0; | |
// receive messages while received count < MESSAGES | |
while (i < MESSAGES) { | |
// lock mutex | |
pthread_mutex_lock(&buffer_mutex); | |
if (global_buffer > 0) { | |
printf("Consumer: RESV %d\n", i); | |
global_buffer--; | |
i++; | |
} | |
// unlock mutex | |
pthread_mutex_unlock(&buffer_mutex); | |
} | |
pthread_exit(NULL); | |
return 0; | |
} | |
int main() { | |
pthread_t producer,consumer; | |
// create threads | |
pthread_create(&producer,NULL,producer_thread,NULL); | |
pthread_create(&consumer,NULL,consumer_thread,NULL); | |
// then join threads | |
pthread_join(producer,NULL); | |
pthread_join(consumer,NULL); | |
return 0; | |
} |
Σωστά.
👍
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Κατάλαβα να μην χρησιμοποιήσουμε καθόλου το buffer για ελέγχους, οπότε θέλετε κάτι τέτοιο;