在 C++11 中设置 std::thread 优先级的便携式方法
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Portable way of setting std::thread priority in C++11
提问by Gerdiner
What is the correct way in the post C++11 world for setting the priority of an instance of std::thread
在 C++11 后的世界中，设置 std::thread 实例优先级的正确方法是什么？
Is there a portable way of doing this that works at least in Windows and POSIX (Linux) environments?
是否有至少在 Windows 和 POSIX (Linux) 环境中有效的便携式方法？
Or is it a matter of getting a handle and using whatever native calls are available for the particular OS?
或者是获取句柄并使用可用于特定操作系统的任何本机调用？
回答by Mike Seymour
There's no way to set thread priorities via the C++11 library. I don't think this is going to change in C++14, and my crystal ball is too hazy to comment on versions after that.
无法通过 C++11 库设置线程优先级。我不认为这会在 C++14 中改变，而且我的水晶球太模糊了，无法评论之后的版本。
In POSIX, pthread_setschedparam(thread.native_handle(), policy, {priority});
在 POSIX 中， pthread_setschedparam(thread.native_handle(), policy, {priority});
I don't know the equivalent Windows function, but I'm sure there must be one.
我不知道等效的 Windows 功能，但我确定一定有一个。
回答by marc
My quick implementation...
我的快速实施...
#include <thread>
#include <pthread.h>
#include <iostream>
#include <cstring>
class thread : public std::thread
{
public:
thread() {}
static void setScheduling(std::thread &th, int policy, int priority) {
sch_params.sched_priority = priority;
if(pthread_setschedparam(th.native_handle(), policy, &sch_params)) {
std::cerr << "Failed to set Thread scheduling : " << std::strerror(errno) << std::endl;
}
}
private:
sched_param sch_params;
};
and this is how I use it...
这就是我如何使用它...
// create thread
std::thread example_thread(example_function);
// set scheduling of created thread
thread::setScheduling(example_thread, SCHED_RR, 2);
回答by Dietmar Kühl
The standard C++ library doesn't define any access to thread priorities. To set thread attributes you'd use the std::thread's native_handle()and use it, e.g., on a POSIX system with pthread_getschedparam()or pthread_setschedparam(). I don't know if there are any proposals to add scheduling attributes to the thread interface.
标准 C++ 库没有定义对线程优先级的任何访问。要设置线程属性，您将使用std::thread'snative_handle()并使用它，例如，在 POSIX 系统上使用pthread_getschedparam()或pthread_setschedparam()。不知道有没有给线程接口添加调度属性的建议。
回答by Rodrigo Rutsatz
In Windows processes are organized in class and level priority. Read this: Scheduling Priorities, it gives a good overall knowledge about thread and process priority. You can use the following functions to control the priorities even dynamically: GetPriorityClass(), SetPriorityClass(), SetThreadPriority(), GetThreadPriority().
在 Windows 中，进程按类和级别优先级进行组织。阅读：调度优先级，它提供了有关线程和进程优先级的全面知识。您甚至可以使用以下函数来动态控制优先级：GetPriorityClass()、SetPriorityClass()、SetThreadPriority()、GetThreadPriority()。
Apperantly you can also use std::thread's native_handle()with pthread_getschedparam()or pthread_setschedparam()on a windows system. Check this example, std::thread: Native Handleand pay attention to the headers added!
Apperantly你也可以使用std::thread的native_handle()有pthread_getschedparam()或pthread_setschedparam()在Windows系统上。检查这个例子，std::thread: Native Handle并注意添加的标题！
