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41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
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// Copyright 2025 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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//go:build linux && (386 || arm || mips || mipsle || ppc)
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package runtime
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import (
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"internal/runtime/atomic"
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"unsafe"
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)
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//go:noescape
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func futex_time32(addr unsafe.Pointer, op int32, val uint32, ts *timespec32, addr2 unsafe.Pointer, val3 uint32) int32
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//go:noescape
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func futex_time64(addr unsafe.Pointer, op int32, val uint32, ts *timespec, addr2 unsafe.Pointer, val3 uint32) int32
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var is32bitOnly atomic.Bool
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//go:nosplit
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func futex(addr unsafe.Pointer, op int32, val uint32, ts *timespec, addr2 unsafe.Pointer, val3 uint32) int32 {
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if !is32bitOnly.Load() {
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ret := futex_time64(addr, op, val, ts, addr2, val3)
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// futex_time64 is only supported on Linux 5.0+
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if ret != -_ENOSYS {
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return ret
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}
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is32bitOnly.Store(true)
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}
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// Downgrade ts.
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var ts32 timespec32
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var pts32 *timespec32
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if ts != nil {
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ts32.setNsec(ts.tv_sec*1e9 + ts.tv_nsec)
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pts32 = &ts32
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}
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return futex_time32(addr, op, val, pts32, addr2, val3)
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}
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