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runtime: preserve signal stack when calling Go on C thread

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When calling a Go function on a C thread, if the C thread already has an
alternate signal stack, use that signal stack instead of installing a
new one.

Update #9896.

Change-Id: I62aa3a6a4a1dc4040fca050757299c8e6736987c
Reviewed-on: https://go-review.googlesource.com/18108
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Ian Lance Taylor 2015-12-23 18:38:18 -08:00
parent 62c280ac1c
commit a7cad52e04
11 changed files with 383 additions and 14 deletions
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21
src/runtime/os1_darwin.go
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@ -152,7 +152,22 @@ func sigblock() {
func minit() {
// Initialize signal handling.
_g_ := getg()
signalstack(&_g_.m.gsignal.stack)
var st stackt
sigaltstack(nil, &st)
if st.ss_flags&_SS_DISABLE != 0 {
signalstack(&_g_.m.gsignal.stack)
_g_.m.newSigstack = true
} else {
// Use existing signal stack.
stsp := uintptr(unsafe.Pointer(st.ss_sp))
_g_.m.gsignal.stack.lo = stsp
_g_.m.gsignal.stack.hi = stsp + st.ss_size
_g_.m.gsignal.stackguard0 = stsp + _StackGuard
_g_.m.gsignal.stackguard1 = stsp + _StackGuard
_g_.m.gsignal.stackAlloc = st.ss_size
_g_.m.newSigstack = false
}
// restore signal mask from m.sigmask and unblock essential signals
nmask := _g_.m.sigmask
@ -167,7 +182,9 @@ func minit() {
// Called from dropm to undo the effect of an minit.
//go:nosplit
func unminit() {
signalstack(nil)
if getg().m.newSigstack {
signalstack(nil)
}
}
// Mach IPC, to get at semaphores