[英]std::thread with pthread_setschedparam with c++ 11
I wanted to set priority of a custom threadpool developed. 我想设置开发的自定义线程池的优先级。 so I found to set the priority need to use pthred's
pthread_setschedparam
method. 所以我发现设置优先级需要使用pthred的
pthread_setschedparam
方法。 Since pthread_t
and native_handle_type
is different I did something like this - 由于
pthread_t
和native_handle_type
不同,所以我做了这样的事情-
void SetPriority(int id, int priority, int policy) {
bool ret = true;
sched_param sch_params;
sch_params.sched_priority = 20;
pthread_t p;
p.p = threads_[id].native_handle();
if (pthread_setschedparam(p, SCHED_FIFO, &sch_params)) {
std::cerr << "Failed to set Thread scheduling : " << std::strerror(errno) << std::endl;
}
}
I am getting Access violation for pthreadVC2.dll
. 我收到
pthreadVC2.dll
访问冲突。
To test if I am with the right windows version's dll I made did some test like this - 为了测试我是否使用了正确的Windows版本的dll,我做了如下测试-
int main(){
pthread_t thread1, thread2;
int thr = 1;
int thr2 = 2;
// start the threads
pthread_create(&thread1, NULL, *threadfn, (void *)thr);
pthread_create(&thread2, NULL, *threadfn, (void *)thr2);
sched_param sch_params;
sch_params.sched_priority = 20;
if (pthread_setschedparam(thread1, SCHED_FIFO, &sch_params)) {
std::cerr << "Failed to set Thread scheduling : " << std::strerror(errno) << std::endl;
}
// wait for threads to finish
int po1, po2;
sched_param sched_param1, sched_param2;
pthread_getschedparam(thread1,&po1,&sched_param1);
pthread_getschedparam(thread2, &po2, &sched_param2);
cout << "thread 1:policy - " << po1 << " priority - " << sched_param1.sched_priority << endl;
cout << "thread 2:policy - " << po2 << " priority - " << sched_param2.sched_priority << endl;
pthread_join(thread1, NULL);
pthread_join(thread2, NULL);
return 0;
}
I found error no is 1 (priority not set). 我发现错误编号为1(未设置优先级)。 And both thread having policy 0 & priority 0
并且两个线程都具有策略0和优先级0
What is the proper way to set priority of a pthread and how can I use this functionality from std::thread ? 设置pthread优先级的正确方法是什么?如何从std :: thread使用此功能?
Edit: Windows environment setup: Using Visual Studio 2015 with windows 10. Downloaded pthread (pthreads-w32-2-9-1-release.zip) from ftp://sourceware.org/pub/pthreads-win32/ . 编辑:Windows环境设置:在Windows 10中使用Visual Studio2015。从ftp://sourceware.org/pub/pthreads-win32/下载了pthread(pthreads-w32-2-9-1-release.zip)。 project setting- included Additional Include Directories Linker > General and set the location of the pthread library Additional dependecies : pthreadVC2.lib and pthreadVCE2.lib and copied pthreadVC2.dll in the project directory.
项目设置-包括Additional Include Directories Linker> General,并设置pthread库的位置其他依赖项:pthreadVC2.lib和pthreadVCE2.lib以及复制的pthreadVC2.dll在项目目录中。
Here is an example program that shows how to use pthread_getschedparam and pthread_setschedparam with std::thread, taken from here . 这是一个示例程序,该示例程序演示如何将pthread_getschedparam和pthread_setschedparam与std :: thread一起使用,摘自此处 。
#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();
}
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