std::jthread::native_handle
From cppreference.com
native_handle_type native_handle(); | (since C++20) (not always present) | |
Returns the implementation defined underlying thread handle.
Contents |
[edit]Parameters
(none)
[edit]Return value
Implementation defined handle type representing the thread.
[edit]Exceptions
May throw implementation-defined exceptions.
[edit]Example
Uses native_handle to enable realtime scheduling of C++ threads on a POSIX system.
Run this 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'; }
Output:
Thread 2 is executing at priority 0 Thread 1 is executing at priority 20
