为什么编译器说'pthread_getthreadid_np'没有在这个范围内声明？ [英] why compiler says ‘pthread_getthreadid_np’ was not declared in this scope?

问题描述

我使用Debian稳定。我在C ++中编写一个多线程应用程序，并使用 g ++ 编译器和 -lpthread参数进行编译。

I am using Debian stable. I was coding a multithreaded application in C++ and using g++ compiler and -lpthread argument to compile.

但是函数 pthread_getthreadid_np（）无效：

错误：'pthread_getthreadid_np'未在此范围内声明

error: ‘pthread_getthreadid_np’ was not declared in this scope

是什么原因导致此错误？ $ b

what is causing this error?

推荐答案

_np 表示不可移植（或不是Posix），在所有平台上。这个函数似乎是特定于BSD，为调用线程获得平台特定的整数ID。它不存在于Linux上。

_np means "not portable" (or "not Posix"), meaning it's not available on all platforms. This function seems to be specific to BSD, to get a platform-specific integer ID for the calling thread. It doesn't exist on Linux.

根据使用的不同，您可能也可能不能使用 pthread_t pthread_self 函数（在Linux上是一个整数类型）返回的c $ c>句柄，或由特定于Linux的 gettid 系统调用。或者，重新思考你在做什么，所以你不需要处理线程标识。

Depending on what it's used for, you may or may not be able to use the pthread_t handle returned by the portable pthread_self function (which is an integer type on Linux), or the numeric thread ID returned by the Linux-specific gettid system call. Alternatively, rethink whatever you're doing so you don't need to deal with thread identities.

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