166 lines
3.4 KiB
Go
166 lines
3.4 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime
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import (
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"internal/abi"
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"internal/goarch"
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"runtime/internal/atomic"
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"unsafe"
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)
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type mOS struct {
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waitsemacount uint32
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}
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func getProcID() uint64 {
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return uint64(lwp_self())
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}
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//extern-sysinfo _lwp_self
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func lwp_self() int32
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//go:noescape
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//extern-sysinfo _lwp_park
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func lwp_park(ts int32, rel int32, abstime *timespec, unpark int32, hint, unparkhint unsafe.Pointer) int32
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//go:noescape
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//extern-sysinfo _lwp_unpark
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func lwp_unpark(lwp int32, hint unsafe.Pointer) int32
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//go:noescape
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//extern-sysinfo sysctl
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func sysctl(*uint32, uint32, *byte, *uintptr, *byte, uintptr) int32
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func sysctlInt(mib []uint32) (int32, bool) {
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var out int32
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nout := unsafe.Sizeof(out)
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ret := sysctl(&mib[0], uint32(len(mib)), (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
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if ret < 0 {
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return 0, false
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}
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return out, true
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}
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func getncpu() int32 {
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if n, ok := sysctlInt([]uint32{_CTL_HW, _HW_NCPUONLINE}); ok {
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return int32(n)
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}
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if n, ok := sysctlInt([]uint32{_CTL_HW, _HW_NCPU}); ok {
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return int32(n)
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}
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return 1
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}
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func getPageSize() uintptr {
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mib := [2]uint32{_CTL_HW, _HW_PAGESIZE}
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out := uint32(0)
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nout := unsafe.Sizeof(out)
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ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
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if ret >= 0 {
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return uintptr(out)
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}
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return 0
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}
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func getOSRev() int {
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if osrev, ok := sysctlInt([]uint32{_CTL_KERN, _KERN_OSREV}); ok {
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return int(osrev)
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}
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return 0
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}
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//go:nosplit
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func semacreate(mp *m) {
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}
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//go:nosplit
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func semasleep(ns int64) int32 {
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_g_ := getg()
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var deadline int64
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if ns >= 0 {
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deadline = nanotime() + ns
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}
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for {
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v := atomic.Load(&_g_.m.waitsemacount)
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if v > 0 {
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if atomic.Cas(&_g_.m.waitsemacount, v, v-1) {
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return 0 // semaphore acquired
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}
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continue
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}
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// Sleep until unparked by semawakeup or timeout.
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var tsp *timespec
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var ts timespec
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if ns >= 0 {
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wait := deadline - nanotime()
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if wait <= 0 {
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return -1
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}
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ts.setNsec(wait)
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tsp = &ts
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}
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ret := lwp_park(_CLOCK_MONOTONIC, _TIMER_RELTIME, tsp, 0, unsafe.Pointer(&_g_.m.waitsemacount), nil)
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if ret != 0 && errno() == _ETIMEDOUT {
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return -1
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}
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}
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}
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//go:nosplit
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func semawakeup(mp *m) {
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atomic.Xadd(&mp.waitsemacount, 1)
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// From NetBSD's _lwp_unpark(2) manual:
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// "If the target LWP is not currently waiting, it will return
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// immediately upon the next call to _lwp_park()."
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ret := lwp_unpark(int32(mp.procid), unsafe.Pointer(&mp.waitsemacount))
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if ret != 0 && errno() != _ESRCH {
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// semawakeup can be called on signal stack.
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systemstack(func() {
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print("thrwakeup addr=", &mp.waitsemacount, " sem=", mp.waitsemacount, " errno=", errno(), "\n")
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})
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}
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}
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func osinit() {
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ncpu = getncpu()
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if physPageSize == 0 {
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physPageSize = getPageSize()
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}
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needSysmonWorkaround = getOSRev() < 902000000 // NetBSD 9.2
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}
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func sysargs(argc int32, argv **byte) {
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n := argc + 1
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// skip over argv, envp to get to auxv
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for argv_index(argv, n) != nil {
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n++
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}
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// skip NULL separator
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n++
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// now argv+n is auxv
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auxv := (*[1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)*goarch.PtrSize))
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sysauxv(auxv[:])
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}
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const (
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_AT_NULL = 0 // Terminates the vector
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_AT_PAGESZ = 6 // Page size in bytes
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)
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func sysauxv(auxv []uintptr) {
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for i := 0; auxv[i] != _AT_NULL; i += 2 {
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tag, val := auxv[i], auxv[i+1]
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switch tag {
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case _AT_PAGESZ:
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physPageSize = val
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}
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}
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}
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