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From: Jonathan Yong <jyong@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r13-3383] libstdc++/thread: Implement `_GLIBCXX_NPROCS` for Windows Date: Wed, 19 Oct 2022 14:05:43 +0000 (GMT) [thread overview] Message-ID: <20221019140543.2F11F3858D3C@sourceware.org> (raw) https://gcc.gnu.org/g:47684e58edc92ffdd4c636dbd34359b4c22e863a commit r13-3383-g47684e58edc92ffdd4c636dbd34359b4c22e863a Author: LIU Hao <lh_mouse@126.com> 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 <unistd.h> # define _GLIBCXX_NPROCS sysconf(_SC_NPROC_ONLN) +#elif defined(_WIN32) +# include <windows.h> +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
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