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  1. #include <pthread.h>
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include <sched.h>
  5.  
  6. #define NUM_THREADS 3  //number of threads
  7.  
  8. void* thread_function(void* arg)
  9. {
  10.     int thread_id = *((int*)arg);
  11.     int i=0;
  12.     while(i<2)//each thread executes only once.//change this '1' to any values for multiple time execution
  13.     {
  14.       printf("id=%d\n", thread_id);
  15.       i++;
  16.     }
  17.  
  18.     printf("Thread %d is running.\n", thread_id);
  19.     return NULL;
  20. }
  21.  
  22. int main()
  23. {
  24.     pthread_t threads[NUM_THREADS];
  25.     pthread_attr_t attr[NUM_THREADS];
  26.     struct sched_param param[NUM_THREADS];
  27.     int thread_ids[NUM_THREADS] = {0, 1, 2};
  28.  
  29.     // Initialize attributes and create threads with round-robin scheduling
  30.     for (int i = 0; i < NUM_THREADS; i++)
  31.     {
  32.         pthread_attr_init(&attr[i]);
  33.  
  34.         // Set scheduling policy to SCHED_RR
  35.         // int policy = SCHED_RR;  //round robin scheduling
  36.         int policy = SCHED_FIFO; // first in first out scheduling
  37.         // int policy = SCHED_OTHER; // uses any other scheduling algorithm
  38.         // int policy = SCHED_SPORADIC;  //sporadic scheduling algorithm
  39.         pthread_attr_setschedpolicy(&attr[i], policy);
  40.  
  41.         // param[i].sched_priority = 10 + i; // Assign different priorities (10, 11, 12)
  42.         // pthread_attr_setschedparam(&attr[i], &param[i]);// assign priorities for priority based scheduling
  43.  
  44.         // Create the thread
  45.         if (pthread_create(&threads[i], &attr[i], thread_function, &thread_ids[i]) != 0)
  46.         {
  47.             perror("pthread_create");
  48.             return EXIT_FAILURE;
  49.         }
  50.     }
  51.  
  52.     for (int i = 0; i < NUM_THREADS; i++)
  53.     {
  54.         pthread_join(threads[i], NULL);
  55.         pthread_attr_destroy(&attr[i]); // Clean up attributes
  56.     }
  57.  
  58.     printf("All threads have finished.\n");
  59.     return 0;
  60. }
Success #stdin #stdout 0s 5280KB
comments (?)
stdin
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Standard input is empty
stdout
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id=2
id=2
Thread 2 is running.
id=1
id=1
Thread 1 is running.
id=0
id=0
Thread 0 is running.
All threads have finished.
https://ideone.com/neDRkE
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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