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c485e8b559
The implementation of semaphores, and therefore notes, used on Darwin is not async-signal-safe. The runtime has one case where a note needs to be woken up from a signal handler: the call to notewakeup in sigsend. That notewakeup call is only called on a single note, and it doesn't need the full functionality of notes: nothing ever does a timed wait on it. So change that one note to use a different implementation on Darwin, based on a pipe. This lets the wakeup code use the write call, which is async-signal-safe. Fixes #31264 Change-Id: If705072d7a961dd908ea9d639c8d12b222c64806 Reviewed-on: https://go-review.googlesource.com/c/go/+/184169 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Russ Cox <rsc@golang.org>
25 lines
654 B
Go
25 lines
654 B
Go
// Copyright 2019 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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// The current implementation of notes on Darwin is not async-signal-safe,
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// so on Darwin the sigqueue code uses different functions to wake up the
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// signal_recv thread. This file holds the non-Darwin implementations of
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// those functions. These functions will never be called.
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// +build !darwin
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// +build !plan9
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package runtime
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func sigNoteSetup(*note) {
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throw("sigNoteSetup")
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}
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func sigNoteSleep(*note) {
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throw("sigNoteSleep")
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}
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func sigNoteWakeup(*note) {
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throw("sigNoteWakeup")
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}
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