mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Jamie Liu
03bebc4402
This allows "remote" locking of ThreadGroup.signalHandlers.mu without needing to lock TaskSet.mu, analogously to Linux's lock_task_sighand(). This reveals a bug: kernel.Task.sendSignal[Timer]Locked() unintentionally requires TaskSet.mu to be locked since it reads Task.exitState. To fix this, use atomic memory operations on Task.exitState when required. PiperOrigin-RevId: 681128063
34 lines
1.3 KiB
Go
34 lines
1.3 KiB
Go
// Copyright 2024 The gVisor Authors.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package kernel
|
|
|
|
import (
|
|
"sync/atomic"
|
|
"unsafe"
|
|
)
|
|
|
|
// SignalHandlers returns the signal handlers used by tg. The returned value
|
|
// may be racy; see the field comment for ThreadGroup.signalHandlers.
|
|
func (tg *ThreadGroup) SignalHandlers() *SignalHandlers {
|
|
return (*SignalHandlers)(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&tg.signalHandlers))))
|
|
}
|
|
|
|
// Preconditions: The only permitted caller of this function is
|
|
// Task.finishExec(), as described in the field comment for
|
|
// ThreadGroup.signalHandlers.
|
|
func (tg *ThreadGroup) setSignalHandlersLocked(sh *SignalHandlers) {
|
|
atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&tg.signalHandlers)), unsafe.Pointer(sh))
|
|
}
|