57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
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// Copyright 2011 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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"unsafe"
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)
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type mOS struct {
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unused byte
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}
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//go:noescape
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//extern _umtx_op
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func sys_umtx_op(addr *uint32, mode int32, val uint32, ptr2, ts *timespec) int32
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// FreeBSD's umtx_op syscall is effectively the same as Linux's futex, and
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// thus the code is largely similar. See Linux implementation
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// and lock_futex.go for comments.
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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 tsp *timespec
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if ns >= 0 {
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var ts timespec
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ts.tv_nsec = 0
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ts.set_sec(int64(timediv(ns, 1000000000, (*int32)(unsafe.Pointer(&ts.tv_nsec)))))
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tsp = &ts
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}
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ret := sys_umtx_op(addr, _UMTX_OP_WAIT_UINT_PRIVATE, val, nil, tsp)
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if ret >= 0 || ret == -_EINTR {
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return
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}
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print("umtx_wait 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_op(addr, _UMTX_OP_WAKE_PRIVATE, cnt, nil, nil)
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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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})
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}
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