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runtime: don't always block all signals on OpenBSD

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Implement the changes from CL 10173 on OpenBSD.

Change-Id: I2db1cd8141fd392a34753a1b8113e2e0401173b9
Reviewed-on: https://go-review.googlesource.com/10342
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Elias Naur 2015-05-23 11:26:22 +02:00 committed by Ian Lance Taylor
parent eeb64b7fef
commit 8017ace496
1 changed files with 17 additions and 1 deletions
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18
src/runtime/os1_openbsd.go
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@ -149,6 +149,11 @@ func mpreinit(mp *m) {
}
func msigsave(mp *m) {
smask := (*uint32)(unsafe.Pointer(&mp.sigmask))
if unsafe.Sizeof(*smask) > unsafe.Sizeof(mp.sigmask) {
throw("insufficient storage for signal mask")
}
*smask = sigprocmask(_SIG_BLOCK, 0)
}
// Called to initialize a new m (including the bootstrap m).
@ -161,11 +166,22 @@ func minit() {
// Initialize signal handling
signalstack((*byte)(unsafe.Pointer(_g_.m.gsignal.stack.lo)), 32*1024)
sigprocmask(_SIG_SETMASK, sigset_none)
// restore signal mask from m.sigmask and unblock essential signals
nmask := *(*uint32)(unsafe.Pointer(&_g_.m.sigmask))
for i := range sigtable {
if sigtable[i].flags&_SigUnblock != 0 {
nmask &^= 1 << (uint32(i) - 1)
}
}
sigprocmask(_SIG_SETMASK, nmask)
}
// Called from dropm to undo the effect of an minit.
func unminit() {
_g_ := getg()
smask := *(*uint32)(unsafe.Pointer(&_g_.m.sigmask))
sigprocmask(_SIG_SETMASK, smask)
signalstack(nil, 0)
}