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go/src/os/wait_unimp.go

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os: on GNU/Linux use waitid to avoid wait/kill race On systems that support the POSIX.1-2008 waitid function, we can use it to block until a wait will succeed. This avoids a possible race condition: if a program calls p.Kill/p.Signal and p.Wait from two different goroutines, then it is possible for the wait to complete just before the signal is sent. In that case, it is possible that the system will start a new process using the same PID between the wait and the signal, causing the signal to be sent to the wrong process. The Process.isdone field attempts to avoid that race, but there is a small gap of time between when wait returns and isdone is set when the race can occur. This CL avoids that race by using waitid to wait until the process has exited without actually collecting the PID. Then it sets isdone, then waits for any active signals to complete, and only then collects the PID. No test because any plausible test would require starting enough processes to recycle all the process IDs. Update #13987. Update #16028. Change-Id: Id2939431991d3b355dfb22f08793585fc0568ce8 Reviewed-on: https://go-review.googlesource.com/23967 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-06-09 23:24:40 -06:00
// Copyright 2016 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.
os: add AIX operating system This commit adds AIX operating system to os package for ppc64 architecture. Updates: #25893 Change-Id: Ieb9a2b3ac5b9abd3b5ab68eb732c17b6256d624d Reviewed-on: https://go-review.googlesource.com/c/138725 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-09-28 07:57:27 -06:00
// +build aix darwin dragonfly js,wasm nacl netbsd openbsd solaris
os: on GNU/Linux use waitid to avoid wait/kill race On systems that support the POSIX.1-2008 waitid function, we can use it to block until a wait will succeed. This avoids a possible race condition: if a program calls p.Kill/p.Signal and p.Wait from two different goroutines, then it is possible for the wait to complete just before the signal is sent. In that case, it is possible that the system will start a new process using the same PID between the wait and the signal, causing the signal to be sent to the wrong process. The Process.isdone field attempts to avoid that race, but there is a small gap of time between when wait returns and isdone is set when the race can occur. This CL avoids that race by using waitid to wait until the process has exited without actually collecting the PID. Then it sets isdone, then waits for any active signals to complete, and only then collects the PID. No test because any plausible test would require starting enough processes to recycle all the process IDs. Update #13987. Update #16028. Change-Id: Id2939431991d3b355dfb22f08793585fc0568ce8 Reviewed-on: https://go-review.googlesource.com/23967 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-06-09 23:24:40 -06:00
package os
// blockUntilWaitable attempts to block until a call to p.Wait will
// succeed immediately, and returns whether it has done so.
// It does not actually call p.Wait.
// This version is used on systems that do not implement waitid,
// or where we have not implemented it yet.
func (p *Process) blockUntilWaitable() (bool, error) {
return false, nil
}
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