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37 lines
868 B
Go
37 lines
868 B
Go
// +build windows
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package sysinfo
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import (
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"runtime"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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var (
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kernel32 = windows.NewLazySystemDLL("kernel32.dll")
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getCurrentProcess = kernel32.NewProc("GetCurrentProcess")
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getProcessAffinityMask = kernel32.NewProc("GetProcessAffinityMask")
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)
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func numCPU() int {
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// Gets the affinity mask for a process
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var mask, sysmask uintptr
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currentProcess, _, _ := getCurrentProcess.Call()
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ret, _, _ := getProcessAffinityMask.Call(currentProcess, uintptr(unsafe.Pointer(&mask)), uintptr(unsafe.Pointer(&sysmask)))
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if ret == 0 {
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return 0
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}
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// For every available thread a bit is set in the mask.
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ncpu := int(popcnt(uint64(mask)))
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return ncpu
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}
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// NumCPU returns the number of CPUs which are currently online
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func NumCPU() int {
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if ncpu := numCPU(); ncpu > 0 {
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return ncpu
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}
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return runtime.NumCPU()
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}
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