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std::jthread:: native_handle

From cppreference.net

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std::jthread
native_handle_type native_handle ( ) ;
(depuis C++20)
(pas toujours présent)

Retourne le descripteur de thread sous-jacent défini par l'implémentation.

Table des matières

Paramètres

(aucun)

Valeur de retour

Type de handle défini par l'implémentation représentant le thread.

Exceptions

Peut lever des exceptions définies par l'implémentation.

Exemple

Utilise native_handle pour activer l'ordonnancement temps réel des threads C++ sur un système POSIX.

Exécuter ce code 
#include <chrono>
#include <cstring>
#include <iostream>
#include <mutex>
#include <pthread.h>
#include <thread>
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::jthread 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';
}

Sortie : 

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