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  1. #include <stdio.h>
  2. #include <pthread.h>
  3.  
  4. pthread_mutex_t lock;
  5. pthread_cond_t condition;
  6.  
  7. void* waiting_thread(void* arg) {
  8.     pthread_mutex_lock(&lock);
  9.     printf("Waiting for signal...\n");
  10.     pthread_cond_wait(&condition, &lock);
  11.     printf("Received signal!\n");
  12.     pthread_mutex_unlock(&lock);
  13.     return NULL;
  14. }
  15.  
  16. void* signaling_thread(void* arg) {
  17.     pthread_mutex_lock(&lock);
  18.     printf("Sending signal...\n");
  19.     pthread_cond_signal(&condition);
  20.     pthread_mutex_unlock(&lock);
  21.     return NULL;
  22. }
  23.  
  24. int main() {
  25.     pthread_t thread1, thread2;
  26.     pthread_mutex_init(&lock, NULL);
  27.     pthread_cond_init(&condition, NULL);
  28.  
  29.     pthread_create(&thread1, NULL, waiting_thread, NULL);
  30.     sleep(1); // Ensuring the waiting thread executes first
  31.     pthread_create(&thread2, NULL, signaling_thread, NULL);
  32.  
  33.     pthread_join(thread1, NULL);
  34.     pthread_join(thread2, NULL);
  35.  
  36.     pthread_mutex_destroy(&lock);
  37.     pthread_cond_destroy(&condition);
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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Standard input is empty
stdout
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Waiting for signal...
Sending signal...
Received signal!
https://ideone.com/kdCPXl
language:
C (gcc 8.3)
created:
13 hours ago
visibility:
public

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