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runtime: revert CL 18835; don't install new signal stack unconditionally on dragonfly

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This change reverts CL 18835 which is a workaroud for older DragonFly
BSD kernels, and fixes #14051, #14052 and #14067 in a more general way
the same as other platforms except NetBSD.

This change also bumps the minimum required version of DragonFly BSD
kernel to 4.4.4.

Fixes #16329.

Change-Id: I0b44b6afa675f5ed9523914226bd9ec4809ba5ae
Reviewed-on: https://go-review.googlesource.com/29491
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Mikio Hara 2016-09-21 12:53:25 +09:00
parent e6134702bb
commit 5db80c30e6
1 changed files with 15 additions and 10 deletions
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25
src/runtime/os_dragonfly.go
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@ -201,16 +201,21 @@ func minit() {
_g_.m.procid = uint64(*(*int32)(unsafe.Pointer(&_g_.m.procid)))
// Initialize signal handling.
// On DragonFly a thread created by pthread_create inherits
// the signal stack of the creating thread. We always create
// a new signal stack here, to avoid having two Go threads
// using the same signal stack. This breaks the case of a
// thread created in C that calls sigaltstack and then calls a
// Go function, because we will lose track of the C code's
// sigaltstack, but it's the best we can do.
signalstack(&_g_.m.gsignal.stack)
_g_.m.newSigstack = true
var st sigaltstackt
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