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runtime: for c-archive/c-shared, install signal handlers synchronously

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The previous behaviour of installing the signal handlers in a separate
thread meant that Go initialization raced with non-Go initialization if
the non-Go initialization also wanted to install signal handlers.  Make
installing signal handlers synchronous so that the process-wide behavior
is predictable.

Update #9896.

Change-Id: Ice24299877ec46f8518b072a381932d273096a32
Reviewed-on: https://go-review.googlesource.com/18150
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Ian Lance Taylor 2015-12-26 09:51:59 -08:00
parent 0b3807a2a3
commit 21b4f234c7
23 changed files with 200 additions and 12 deletions
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8
src/runtime/os1_openbsd.go
View file

@ -220,6 +220,8 @@ type sigactiont struct {
sa_flags int32
}
//go:nosplit
//go:nowritebarrierrec
func setsig(i int32, fn uintptr, restart bool) {
var sa sigactiont
sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK
@ -234,10 +236,14 @@ func setsig(i int32, fn uintptr, restart bool) {
sigaction(i, &sa, nil)
}
//go:nosplit
//go:nowritebarrierrec
func setsigstack(i int32) {
throw("setsigstack")
}
//go:nosplit
//go:nowritebarrierrec
func getsig(i int32) uintptr {
var sa sigactiont
sigaction(i, nil, &sa)
@ -260,6 +266,8 @@ func signalstack(s *stack) {
sigaltstack(&st, nil)
}
//go:nosplit
//go:nowritebarrierrec
func updatesigmask(m sigmask) {
sigprocmask(_SIG_SETMASK, sigset(m[0]))
}