fork(1) download 
  1. #include <stdio.h>
  2. #include <pthread.h>
  3.  
  4. int shared = 0;
  5.  
  6. typedef struct {
  7.     int increments;
  8. } ThreadData;
  9.  
  10. void* increment(void* arg) {
  11.     ThreadData* data = (ThreadData*)arg;
  12.     for(int i = 0; i < data->increments; i++) {
  13.         shared++;
  14.     }
  15.     return NULL;
  16. }
  17.  
  18. int main() {
  19.     int THREADS, INCREMENTS;
  20.     printf("Enter number of threads: ");
  21.     scanf("%d", &THREADS);
  22.     printf("Enter number of increments per thread: ");
  23.     scanf("%d", &INCREMENTS);
  24.  
  25.     pthread_t threads[THREADS];
  26.     ThreadData data = {INCREMENTS};
  27.  
  28.     for(int i = 0; i < THREADS; i++) {
  29.         pthread_create(&threads[i], NULL, increment, &data);
  30.     }
  31.  
  32.     for(int i = 0; i < THREADS; i++) {
  33.         pthread_join(threads[i], NULL);
  34.     }
  35.  
  36.     printf("Final value of shared variable = %d\n", shared);
  37.  
  38.     return 0;
  39. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
5
100000
stdout 
Enter number of threads: Enter number of increments per thread: Final value of shared variable = 500000
https://ideone.com/A8gPqh
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!