std::thread::native_handle (3) - Linux Manuals

std::thread::native_handle: std::thread::native_handle

NAME

std::thread::native_handle - std::thread::native_handle

Synopsis

native_handle_type native_handle(); (since C++11)

Returns the implementation defined underlying thread handle.

Parameters

(none)

Return value

implementation defined handle type representing the thread.

Exceptions

(none)

Example

Uses native_handle to enable realtime scheduling of C++ threads on a POSIX system
// Run this code

  #include <thread>
  #include <mutex>
  #include <iostream>
  #include <chrono>
  #include <cstring>
  #include <pthread.h>

  std::mutex iomutex;
  void f(int num)
  {
      std::this_thread::sleep_for(std::chrono::seconds(1));

      sched_param sch;
      int policy;
      pthread_getschedparam(pthread_self(), &policy, &sch);
      std::lock_guard<std::mutex> lk(iomutex);
      std::cout << "Thread " << num << " is executing at priority "
                << sch.sched_priority << '\n';
  }

  int main()
  {
      std::thread t1(f, 1), t2(f, 2);

      sched_param sch;
      int policy;
      pthread_getschedparam(t1.native_handle(), &policy, &sch);
      sch.sched_priority = 20;
      if (pthread_setschedparam(t1.native_handle(), SCHED_FIFO, &sch)) {
          std::cout << "Failed to setschedparam: " << std::strerror(errno) << '\n';
      }

      t1.join(); t2.join();
  }

Output:

  Thread 2 is executing at priority 0
  Thread 1 is executing at priority 20