在Linux上学习线程 [英] learning threads on linux
问题描述
Linux对我来说是一个新平台.我已经在Windows上使用c ++进行了编码，已经适应了该平台上的多线程.
Linux is a new platform to me. I've coded on Windows in c++ for a number of years and have become comfortable with multithreading on that platform.
我需要在linux平台上学习c ++的时候，C ++ 11也随之出现.
Along comes C++11 at a time when I need to learn c++ on the linux platform.
Linux似乎大部分使用pthreads-好的，boost :: threads和QT也有自己的线程.但是C ++ 11附带了std :: thread，这是一种全新的(跨平台和C ++标准)执行线程的方法.
Linux appears to use pthreads for the most part - okay there's also boost::threads and QT have their own threads too. But with C++11 comes std::thread, a whole new (cross platform and C++ standard) way to do threads.
所以我想我必须学习pthread和std :: threads.最终，std :: thread似乎更重要，但是那里有很多旧代码，所以我必须都知道.
So I guess I'll have to learn pthreads and std::threads. Ultimately, std::thread seems more important, but there's a lot of legacy code out there, so I'll have to know both.
对于Windows上的线程同步，我将使用 WaitForMultipleObjects 等待许多任务完成，然后再继续进行进一步的工作.
For thread synchronization on windows, I would use WaitForMultipleObjects to wait for a number of tasks to complete before continuing with further work.
pthread是否存在类似的同步机制? std :: threads?
Does a similar synchronization mechanism exist for pthreads? std::threads?
我看过 pthread_join ，并且似乎可以一次只等待一个线程.我可能还错过了另一个pthread调用吗?
I've had a look at pthread_join, and it seems to have the facility to only wait on one thread at a time. Am I missing another pthread call maybe?
推荐答案
std::thread is boost::thread accepted into C++11 with some extras. My understanding is that if boost::thread gets replaced in code with std::thread it should still compile and work.
boost::thread基于pthreads设计，为线程，互斥量和条件变量提供了精简的C ++包装器.线程取消虽然未包含在C ++ 11的范围内，但由于未达成共识，因此在C ++中应如何使用.
boost::thread is based on pthreads design, providing thin C++ wrappers over thread, mutex and condition variables. Thread cancellation though was left outside the scope of C++11, since there was no agreement how it should work in C++.
因此，通过学习pthreads，您还将学习std::thread概念. std::thread在pthreads C API之上主要添加了语法糖和便利功能.
So, by learning pthreads you also learn std::thread concepts. std::thread adds mostly syntax sugar and convenience functions on top of pthreads C API.
关于WaitForMultipleObjects()，pthreads和std::thread均未提供与其bWaitAll=FALSE模式相似的功能，但是，它通常在UNIX上使用管道和select()进行模拟，或更现代的eventfd()和epoll()在Linux上.可以依次等待所有任务来模拟bWaitAll=TRUE模式，因为直到所有对象都准备就绪，它才继续进行.
With regards to WaitForMultipleObjects(), neither pthreads nor std::thread provide anything similar to its bWaitAll=FALSE mode, however, it's routinely simulated using pipes and select() on UNIX, or more modern eventfd() and epoll() on Linux. bWaitAll=TRUE mode can be simulated by waiting on all tasks in turn, since it doesn't proceed until all objects are ready anyway.
这篇关于在Linux上学习线程的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
