diff options
Diffstat (limited to 'src/runtime/os_linux.go')
| -rw-r--r-- | src/runtime/os_linux.go | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/runtime/os_linux.go b/src/runtime/os_linux.go index e0e3f4e341..d8c1827852 100644 --- a/src/runtime/os_linux.go +++ b/src/runtime/os_linux.go @@ -5,6 +5,7 @@ package runtime import ( + "runtime/internal/atomic" "runtime/internal/sys" "unsafe" ) @@ -479,7 +480,21 @@ 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) } |