86 lines
2.7 KiB
Go
86 lines
2.7 KiB
Go
// Copyright 2017-2021 DERO Project. All rights reserved.
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// Use of this source code in any form is governed by RESEARCH license.
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// license can be found in the LICENSE file.
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// GPG: 0F39 E425 8C65 3947 702A 8234 08B2 0360 A03A 9DE8
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//
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package main
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import "runtime"
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import "sync/atomic"
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import "syscall"
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import "unsafe"
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import "math/bits"
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var libkernel32 uintptr
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var setThreadAffinityMask uintptr
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func doLoadLibrary(name string) uintptr {
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lib, _ := syscall.LoadLibrary(name)
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return uintptr(lib)
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}
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func doGetProcAddress(lib uintptr, name string) uintptr {
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addr, _ := syscall.GetProcAddress(syscall.Handle(lib), name)
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return uintptr(addr)
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}
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func syscall3(trap, nargs, a1, a2, a3 uintptr) uintptr {
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ret, _, _ := syscall.Syscall(trap, nargs, a1, a2, a3)
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return ret
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}
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func init() {
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libkernel32 = doLoadLibrary("kernel32.dll")
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setThreadAffinityMask = doGetProcAddress(libkernel32, "SetThreadAffinityMask")
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}
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var processor int32
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// currently we suppport upto 64 cores
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func SetThreadAffinityMask(hThread syscall.Handle, dwThreadAffinityMask uint) *uint32 {
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ret1 := syscall3(setThreadAffinityMask, 2,
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uintptr(hThread),
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uintptr(dwThreadAffinityMask),
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0)
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return (*uint32)(unsafe.Pointer(ret1))
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}
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// CurrentThread returns the handle for the current thread.
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// It is a pseudo handle that does not need to be closed.
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func CurrentThread() syscall.Handle { return syscall.Handle(^uintptr(2 - 1)) }
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// sets thread affinity to avoid cache collision and thread migration
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func threadaffinity() {
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lock_on_cpu := atomic.AddInt32(&processor, 1)
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if lock_on_cpu >= int32(runtime.GOMAXPROCS(0)) { // threads are more than cpu, we do not know what to do
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return
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}
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if lock_on_cpu >= bits.UintSize {
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return
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}
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var cpuset uint
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cpuset = 1 << uint(avoidHT(int(lock_on_cpu)))
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SetThreadAffinityMask(CurrentThread(), cpuset)
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}
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func avoidHT(i int) int {
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count := runtime.GOMAXPROCS(0)
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if i < count/2 {
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return i * 2
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} else {
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return (i-count/2)*2 + 1
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}
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}
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