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runtime: remove remnants of signal stack workaround

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Updates #35979

Change-Id: Ic3a6e1b5e9d544979a3c8d909a36a55efa3b9c9d
Reviewed-on: https://go-review.googlesource.com/c/go/+/251757
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Heisenberg 2020-08-31 19:22:36 +08:00 committed by Austin Clements
parent 5f5a55679c
commit 4d89b3231d
1 changed files with 0 additions and 15 deletions
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15
src/runtime/os_linux.go
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@ -5,7 +5,6 @@
package runtime
import (
"runtime/internal/atomic"
"runtime/internal/sys"
"unsafe"
)
@ -476,21 +475,7 @@ func rt_sigaction(sig uintptr, new, old *sigactiont, size uintptr) int32
func getpid() int
func tgkill(tgid, tid, sig int)
// touchStackBeforeSignal stores an errno value. If non-zero, it means
// that we should touch the signal stack before sending a signal.
// This is used on systems that have a bug when the signal stack must
// be faulted in. See #35777 and #37436.
//
// This is accessed atomically as it is set and read in different threads.
//
// TODO(austin): Remove this after Go 1.15 when we remove the
// mlockGsignal workaround.
var touchStackBeforeSignal uint32
// signalM sends a signal to mp.
func signalM(mp *m, sig int) {
if atomic.Load(&touchStackBeforeSignal) != 0 {
atomic.Cas((*uint32)(unsafe.Pointer(mp.gsignal.stack.hi-4)), 0, 0)
}
tgkill(getpid(), int(mp.procid), sig)
}