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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <pthread.h>
  4. #include <thread>         // std::this_thread::sleep_for
  5. #include <chrono> 
  6. #include <iostream>
  7.  
  8. // std::mutex m1;
  9. // std::mutex m2;
  10.  
  11. void*  function( void*  arg )
  12. {
  13.    printf( "This is thread %ld\n", pthread_self() );
  14.    return( 0 );
  15. }
  16.  
  17. int main( void )
  18. {
  19.    pthread_attr_t attr;
  20.  
  21.    pthread_attr_init( &attr );
  22.    pthread_attr_setdetachstate(
  23.       &attr, PTHREAD_CREATE_DETACHED );
  24.     pthread_t thread;
  25.    pthread_create( &thread, &attr, &function, NULL );
  26.  
  27.     int policy = SCHED_FIFO; ; 
  28.     int const min_value{ sched_get_priority_min(policy) };
  29.     std::cout << "Min prio:" << min_value << '\n';
  30.     int const max_value{ sched_get_priority_max(policy) };
  31.     std::cout << "Max prio:" << max_value << '\n';
  32.  
  33.          sched_param sch;
  34.     pthread_getschedparam(thread, &policy, &sch);
  35.     sch.sched_priority = 20;
  36.     if (pthread_setschedparam(thread, policy, &sch)) {
  37.         std::cout << "Failed to setschedparam: " << '\n';
  38.     }
  39.     std::cout << "Policy: " << policy << '\n';
  40.    /* Allow threads to run for 60 seconds. */
  41.    //sleep( 60 );
  42.    std::chrono::microseconds(200000);
  43.    return EXIT_SUCCESS;
  44. }
Success #stdin #stdout 0.01s 5252KB
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stdin
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Standard input is empty
stdout
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Min prio:1
Max prio:99
Failed to setschedparam: 
Policy: 0
https://ideone.com/W2Vb78
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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