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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <pthread.h>
  4. #define THREADS 3
  5. pthread_mutex_t lock;  
  6. int shared_counter = 0; 
  7. void* factorial(void* arg) {
  8.     int num = *(int*)arg;
  9.     long long fact = 1;
  10.     for(int i = 1; i <= num; i++) {
  11.         fact *= i;
  12.     }
  13.     printf("Factorial of %d = %lld\n", num, fact);
  14.     pthread_mutex_lock(&lock);
  15.     shared_counter++;
  16.     pthread_mutex_unlock(&lock);
  17.     return NULL;
  18. }
  19. int main() {
  20.     pthread_t threads[THREADS];
  21.     int numbers[THREADS] = {5, 6, 7};
  22.     pthread_mutex_init(&lock, NULL);
  23.     for(int i = 0; i < THREADS; i++) {
  24.         if(pthread_create(&threads[i], NULL, factorial, &numbers[i]) != 0) {
  25.             printf("Thread creation failed\n");
  26.             return 1;
  27.         }
  28.     }
  29.     for(int i = 0; i < THREADS; i++) {
  30.         pthread_join(threads[i], NULL);
  31.     }
  32.     printf("All threads completed.\n");
  33.     printf("Shared Counter = %d\n", shared_counter);
  34.     pthread_mutex_destroy(&lock);
  35.     return 0;
  36. }
Success #stdin #stdout 0s 5288KB
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stdin
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Standard input is empty
stdout
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Factorial of 7 = 5040
Factorial of 6 = 720
Factorial of 5 = 120
All threads completed.
Shared Counter = 3
https://ideone.com/BA9HZ4
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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