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| author | LIU Hao <lh_mouse@126.com> | 2022-10-02 00:57:08 +0800 |
|---|---|---|
| committer | Jonathan Yong <10walls@gmail.com> | 2022-10-19 14:05:33 +0000 |
| commit | 47684e58edc92ffdd4c636dbd34359b4c22e863a (patch) | |
| tree | 6c5ecfca0ce9ec2f555061f82a6b7dd59b5e0058 | |
| parent | d32969898e113e86e1c42b0c6f096f8228cbf1ff (diff) | |
| download | gcc-47684e58edc92ffdd4c636dbd34359b4c22e863a.zip gcc-47684e58edc92ffdd4c636dbd34359b4c22e863a.tar.gz gcc-47684e58edc92ffdd4c636dbd34359b4c22e863a.tar.bz2 | |
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
| -rw-r--r-- | libstdc++-v3/src/c++11/thread.cc | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/libstdc++-v3/src/c++11/thread.cc b/libstdc++-v3/src/c++11/thread.cc index 707a4ad..a54bc3e 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 |