Commit `432b7685bf`

kristopher tate <kris.tate+github@gmail.com>

2018-08-02 18:59:59

std/os/index.zig: use "hw.logicalcpu" instead of "hw.ncpu" in macOS; (#1317)

Tracking Issue #1252 ; hw.ncpu was deprecated in macOS. Among 4 new options available (hw.{physicalcpu, physicalcpu_max, logicalcpu, logicalcpu_max}), hw.logicalcpu was chosen because it actually reflects the number of logical cores the OS sees.

master

1 parent e66f538

Changed files (1)

std

index.zig

@@ -2790,7 +2790,7 @@ pub fn cpuCount(fallback_allocator: *mem.Allocator) CpuCountError!usize {
         builtin.Os.macosx => {
             var count: c_int = undefined;
             var count_len: usize = @sizeOf(c_int);
-            const rc = posix.sysctlbyname(c"hw.ncpu", @ptrCast(*c_void, &count), &count_len, null, 0);
+            const rc = posix.sysctlbyname(c"hw.logicalcpu", @ptrCast(*c_void, &count), &count_len, null, 0);
             const err = posix.getErrno(rc);
             switch (err) {
                 0 => return @intCast(usize, count),

Commit 432b7685bf

Commit `432b7685bf`