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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <pthread.h>
  4. #include <unistd.h> // For sleep function
  5.  
  6. void *print_message_function(void *ptr);
  7.  
  8. int main()
  9. {
  10.     pthread_t thread1, thread2;
  11.     char *message1 = "Thread 1";
  12.     char *message2 = "Thread 2";
  13.     int iret1, iret2;
  14.  
  15.     /* Create independent threads each of which will execute function */
  16.     iret1 = pthread_create(&thread1, NULL, print_message_function, (void *)message1);
  17.  
  18.     // Introduce a delay to ensure thread1 has started (not reliable for all cases)
  19.     sleep(1); // Sleep for 1 second
  20.  
  21.     iret2 = pthread_create(&thread2, NULL, print_message_function, (void *)message2);
  22.  
  23.     /* Wait till threads are complete before main continues. Unless we */
  24.     /* wait we run the risk of executing an exit which will terminate */
  25.     /* the process and all threads before the threads have completed. */
  26.     pthread_join(thread1, NULL);
  27.     pthread_join(thread2, NULL);
  28.  
  29.     printf("Thread 1 returns: %d\n", iret1);
  30.     printf("Thread 2 returns: %d\n", iret2);
  31.  
  32.     exit(0);
  33. }
  34.  
  35. void *print_message_function(void *ptr)
  36. {
  37.     char *message;
  38.     message = (char *)ptr;
  39.     printf("%s\n", message);
  40.     return NULL;
  41. }
  42.  
Success #stdin #stdout 0s 5280KB
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stdin
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Standard input is empty
stdout
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Thread 1
Thread 2
Thread 1 returns: 0
Thread 2 returns: 0
https://ideone.com/YWIVcG
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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