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Count processors across all processor groups in Etc.nprocessors #103

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Merged
hsbt merged 3 commits into from
Sep 27, 2026
Merged

Count processors across all processor groups in Etc.nprocessors #103

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20f7cf4
Count processors across all processor groups in Etc.nprocessors
hsbt Sep 16, 2026
77a035f
Define ALL_PROCESSOR_GROUPS for mingw builds
hsbt Sep 16, 2026
a3cfa20
Require NUMBER_OF_PROCESSORS in test_nprocessors
hsbt Sep 16, 2026
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22 changes: 19 additions & 3 deletions ext/etc/etc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1074,6 +1074,7 @@ etc_nprocessors_affin(void)
* This method is implemented using:
* - sched_getaffinity(): Linux
* - sysconf(_SC_NPROCESSORS_ONLN): GNU/Linux, NetBSD, FreeBSD, OpenBSD, DragonFly BSD, OpenIndiana, Mac OS X, AIX
* - GetActiveProcessorCount(ALL_PROCESSOR_GROUPS): Windows
*
* *Example:*
*
Expand Down Expand Up @@ -1112,9 +1113,24 @@ etc_nprocessors(VALUE obj)
rb_sys_fail("sysconf(_SC_NPROCESSORS_ONLN)");
}
#else
SYSTEM_INFO si;
GetSystemInfo(&si);
ret = (long)si.dwNumberOfProcessors;
# ifndef ALL_PROCESSOR_GROUPS
# define ALL_PROCESSOR_GROUPS 0xffff
# endif
/* GetSystemInfo() counts the current processor group only, and mingw-w64 declares GetActiveProcessorCount() only for _WIN32_WINNT >= 0x0601 */
typedef DWORD (WINAPI *GetActiveProcessorCount_t)(WORD);
GetActiveProcessorCount_t pGetActiveProcessorCount =
(GetActiveProcessorCount_t)GetProcAddress(GetModuleHandleW(L"kernel32.dll"), "GetActiveProcessorCount");
DWORD n = 0;

if (pGetActiveProcessorCount) {
n = pGetActiveProcessorCount(ALL_PROCESSOR_GROUPS);
}
if (n == 0) {
SYSTEM_INFO si;
GetSystemInfo(&si);
n = si.dwNumberOfProcessors;
}
ret = (long)n;
#endif
return LONG2NUM(ret);
}
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3 changes: 3 additions & 0 deletions test/etc/test_etc.rb
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Expand Up @@ -167,6 +167,9 @@ def test_pathconf
def test_nprocessors
n = Etc.nprocessors
assert_operator(1, :<=, n)
if /mswin|mingw/ =~ RUBY_PLATFORM
assert_operator(Integer(ENV.fetch("NUMBER_OF_PROCESSORS")), :<=, n)
end
end

def test_sysconfdir
Expand Down
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