134 lines
3 KiB
Go
134 lines
3 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package runtime
|
|
|
|
import (
|
|
"internal/abi"
|
|
"runtime/internal/atomic"
|
|
"unsafe"
|
|
)
|
|
|
|
type mOS struct {
|
|
waitsemacount uint32
|
|
}
|
|
|
|
//go:noescape
|
|
//extern thrsleep
|
|
func thrsleep(ident uintptr, clock_id int32, tsp *timespec, lock uintptr, abort *uint32) int32
|
|
|
|
//go:noescape
|
|
//extern thrwakeup
|
|
func thrwakeup(ident uintptr, n int32) int32
|
|
|
|
//go:noescape
|
|
//extern sysctl
|
|
func sysctl(*uint32, uint32, *byte, *uintptr, *byte, uintptr) int32
|
|
|
|
// From OpenBSD's <sys/sysctl.h>
|
|
const (
|
|
_CTL_KERN = 1
|
|
_KERN_OSREV = 3
|
|
|
|
_CTL_HW = 6
|
|
_HW_NCPU = 3
|
|
_HW_PAGESIZE = 7
|
|
_HW_NCPUONLINE = 25
|
|
)
|
|
|
|
func sysctlInt(mib []uint32) (int32, bool) {
|
|
var out int32
|
|
nout := unsafe.Sizeof(out)
|
|
ret := sysctl(&mib[0], uint32(len(mib)), (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
|
|
if ret < 0 {
|
|
return 0, false
|
|
}
|
|
return out, true
|
|
}
|
|
|
|
func getncpu() int32 {
|
|
// Try hw.ncpuonline first because hw.ncpu would report a number twice as
|
|
// high as the actual CPUs running on OpenBSD 6.4 with hyperthreading
|
|
// disabled (hw.smt=0). See https://golang.org/issue/30127
|
|
if n, ok := sysctlInt([]uint32{_CTL_HW, _HW_NCPUONLINE}); ok {
|
|
return int32(n)
|
|
}
|
|
if n, ok := sysctlInt([]uint32{_CTL_HW, _HW_NCPU}); ok {
|
|
return int32(n)
|
|
}
|
|
return 1
|
|
}
|
|
|
|
func getPageSize() uintptr {
|
|
if ps, ok := sysctlInt([]uint32{_CTL_HW, _HW_PAGESIZE}); ok {
|
|
return uintptr(ps)
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func getOSRev() int {
|
|
if osrev, ok := sysctlInt([]uint32{_CTL_KERN, _KERN_OSREV}); ok {
|
|
return int(osrev)
|
|
}
|
|
return 0
|
|
}
|
|
|
|
//go:nosplit
|
|
func semacreate(mp *m) {
|
|
}
|
|
|
|
//go:nosplit
|
|
func semasleep(ns int64) int32 {
|
|
_g_ := getg()
|
|
|
|
// Compute sleep deadline.
|
|
var tsp *timespec
|
|
if ns >= 0 {
|
|
var ts timespec
|
|
ts.setNsec(ns + nanotime())
|
|
tsp = &ts
|
|
}
|
|
|
|
for {
|
|
v := atomic.Load(&_g_.m.mos.waitsemacount)
|
|
if v > 0 {
|
|
if atomic.Cas(&_g_.m.mos.waitsemacount, v, v-1) {
|
|
return 0 // semaphore acquired
|
|
}
|
|
continue
|
|
}
|
|
|
|
// Sleep until woken by semawakeup or timeout; or abort if waitsemacount != 0.
|
|
//
|
|
// From OpenBSD's __thrsleep(2) manual:
|
|
// "The abort argument, if not NULL, points to an int that will
|
|
// be examined [...] immediately before blocking. If that int
|
|
// is non-zero then __thrsleep() will immediately return EINTR
|
|
// without blocking."
|
|
ret := thrsleep(uintptr(unsafe.Pointer(&_g_.m.mos.waitsemacount)), _CLOCK_MONOTONIC, tsp, 0, &_g_.m.mos.waitsemacount)
|
|
if ret == _EWOULDBLOCK {
|
|
return -1
|
|
}
|
|
}
|
|
}
|
|
|
|
//go:nosplit
|
|
func semawakeup(mp *m) {
|
|
atomic.Xadd(&mp.mos.waitsemacount, 1)
|
|
ret := thrwakeup(uintptr(unsafe.Pointer(&mp.mos.waitsemacount)), 1)
|
|
if ret != 0 && ret != _ESRCH {
|
|
// semawakeup can be called on signal stack.
|
|
systemstack(func() {
|
|
print("thrwakeup addr=", &mp.mos.waitsemacount, " sem=", mp.mos.waitsemacount, " ret=", ret, "\n")
|
|
})
|
|
}
|
|
}
|
|
|
|
func osinit() {
|
|
ncpu = getncpu()
|
|
physPageSize = getPageSize()
|
|
haveMapStack = getOSRev() >= 201805 // OpenBSD 6.3
|
|
}
|
|
|
|
var haveMapStack = false
|