dd931d9b48
Reviewed-on: https://go-review.googlesource.com/136435 gotools/: * Makefile.am (mostlyclean-local): Run chmod on check-go-dir to make sure it is writable. (check-go-tools): Likewise. (check-vet): Copy internal/objabi to check-vet-dir. * Makefile.in: Rebuild. From-SVN: r264546
64 lines
1.5 KiB
Go
64 lines
1.5 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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"runtime/internal/sys"
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"unsafe"
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)
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type mOS struct{}
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//go:noescape
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//extern umtx_sleep
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func sys_umtx_sleep(addr *uint32, val, timeout int32) int32
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//go:noescape
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//extern umtx_wakeup
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func sys_umtx_wakeup(addr *uint32, val int32) int32
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//go:nosplit
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func futexsleep(addr *uint32, val uint32, ns int64) {
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systemstack(func() {
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futexsleep1(addr, val, ns)
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})
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}
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func futexsleep1(addr *uint32, val uint32, ns int64) {
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var timeout int32
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if ns >= 0 {
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// The timeout is specified in microseconds - ensure that we
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// do not end up dividing to zero, which would put us to sleep
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// indefinitely...
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timeout = timediv(ns, 1000, nil)
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if timeout == 0 {
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timeout = 1
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}
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}
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// sys_umtx_sleep will return EWOULDBLOCK (EAGAIN) when the timeout
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// expires or EBUSY if the mutex value does not match.
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ret := sys_umtx_sleep(addr, int32(val), timeout)
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if ret >= 0 || ret == -_EINTR || ret == -_EAGAIN || ret == -_EBUSY {
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return
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}
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print("umtx_sleep addr=", addr, " val=", val, " ret=", ret, "\n")
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*(*int32)(unsafe.Pointer(uintptr(0x1005))) = 0x1005
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}
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//go:nosplit
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func futexwakeup(addr *uint32, cnt uint32) {
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ret := sys_umtx_wakeup(addr, int32(cnt))
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if ret >= 0 {
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return
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}
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systemstack(func() {
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print("umtx_wake_addr=", addr, " ret=", ret, "\n")
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*(*int32)(unsafe.Pointer(uintptr(0x1006))) = 0x1006
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})
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}
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