From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1814) id 2F11F3858D3C; Wed, 19 Oct 2022 14:05:43 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2F11F3858D3C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1666188343; bh=HnY+5UAa80dNMFqMlnyAJ0g6BCYWuuKJCOxr3Ztp0Xs=; h=From:To:Subject:Date:From; b=IItpH7I6i0oo9P5C2uRzU5xyc9nQ9Ym83E5u3caOVdjaZgVEXlAq6czD/ztqSmWyb KjfexrXFUBzVq8Asez7b7B/ojW+MuS/NVh1fBoc8XOVv/ORvlxnn7SMT1h/kHtdZe6 wZxKGipQBShscAJ/ZFZQ4z3Eu73/GWMM0hSIRzm4= MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Jonathan Yong To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r13-3383] libstdc++/thread: Implement `_GLIBCXX_NPROCS` for Windows X-Act-Checkin: gcc X-Git-Author: LIU Hao X-Git-Refname: refs/heads/master X-Git-Oldrev: d32969898e113e86e1c42b0c6f096f8228cbf1ff X-Git-Newrev: 47684e58edc92ffdd4c636dbd34359b4c22e863a Message-Id: <20221019140543.2F11F3858D3C@sourceware.org> Date: Wed, 19 Oct 2022 14:05:43 +0000 (GMT) List-Id: https://gcc.gnu.org/g:47684e58edc92ffdd4c636dbd34359b4c22e863a commit r13-3383-g47684e58edc92ffdd4c636dbd34359b4c22e863a Author: LIU Hao Date: Sun Oct 2 00:57:08 2022 +0800 libstdc++/thread: Implement `_GLIBCXX_NPROCS` for Windows This makes `std::thread::hardware_concurrency()` return the number of logical processors, instead of zero. libstdc++-v3/ChangeLog: * src/c++11/thread.cc (get_nprocs): Add new implementation for native Windows targets Diff: --- libstdc++-v3/src/c++11/thread.cc | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/libstdc++-v3/src/c++11/thread.cc b/libstdc++-v3/src/c++11/thread.cc index 707a4ad415b..a54bc3e939a 100644 --- a/libstdc++-v3/src/c++11/thread.cc +++ b/libstdc++-v3/src/c++11/thread.cc @@ -68,6 +68,15 @@ static inline int get_nprocs() #elif defined(_GLIBCXX_USE_SC_NPROC_ONLN) # include # define _GLIBCXX_NPROCS sysconf(_SC_NPROC_ONLN) +#elif defined(_WIN32) +# include +static inline int get_nprocs() +{ + SYSTEM_INFO sysinfo; + GetSystemInfo(&sysinfo); + return (int) sysinfo.dwNumberOfProcessors; +} +# define _GLIBCXX_NPROCS get_nprocs() #else # define _GLIBCXX_NPROCS 0 #endif