2c4ae3b0a4
Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для неё не нужна. Module path github.com/sagernet/gvisor сохранён намеренно: на него опирается replace-директива суперпроекта. Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show и переносилась на новый пин копированием. SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH
80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
// Copyright 2019 The gVisor Authors.
|
|
//
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file or at
|
|
// https://developers.google.com/open-source/licenses/bsd.
|
|
|
|
package sync
|
|
|
|
import (
|
|
"sync"
|
|
"unsafe"
|
|
)
|
|
|
|
// CrossGoroutineMutex is equivalent to Mutex, but it need not be unlocked by a
|
|
// the same goroutine that locked the mutex.
|
|
type CrossGoroutineMutex struct {
|
|
m sync.Mutex
|
|
}
|
|
|
|
// Lock locks the underlying Mutex.
|
|
// +checklocksignore
|
|
func (m *CrossGoroutineMutex) Lock() {
|
|
m.m.Lock()
|
|
}
|
|
|
|
// Unlock unlocks the underlying Mutex.
|
|
// +checklocksignore
|
|
func (m *CrossGoroutineMutex) Unlock() {
|
|
m.m.Unlock()
|
|
}
|
|
|
|
// TryLock tries to acquire the mutex. It returns true if it succeeds and false
|
|
// otherwise. TryLock does not block.
|
|
func (m *CrossGoroutineMutex) TryLock() bool {
|
|
return m.m.TryLock()
|
|
}
|
|
|
|
// Mutex is a mutual exclusion lock. The zero value for a Mutex is an unlocked
|
|
// mutex.
|
|
//
|
|
// A Mutex must not be copied after first use.
|
|
//
|
|
// A Mutex must be unlocked by the same goroutine that locked it. This
|
|
// invariant is enforced with the 'checklocks' build tag.
|
|
type Mutex struct {
|
|
m CrossGoroutineMutex
|
|
}
|
|
|
|
// Lock locks m. If the lock is already in use, the calling goroutine blocks
|
|
// until the mutex is available.
|
|
// +checklocksignore
|
|
func (m *Mutex) Lock() {
|
|
noteLock(unsafe.Pointer(m))
|
|
m.m.Lock()
|
|
}
|
|
|
|
// Unlock unlocks m.
|
|
//
|
|
// Preconditions:
|
|
// - m is locked.
|
|
// - m was locked by this goroutine.
|
|
//
|
|
// +checklocksignore
|
|
func (m *Mutex) Unlock() {
|
|
noteUnlock(unsafe.Pointer(m))
|
|
m.m.Unlock()
|
|
}
|
|
|
|
// TryLock tries to acquire the mutex. It returns true if it succeeds and false
|
|
// otherwise. TryLock does not block.
|
|
// +checklocksignore
|
|
func (m *Mutex) TryLock() bool {
|
|
// Note lock first to enforce proper locking even if unsuccessful.
|
|
noteLock(unsafe.Pointer(m))
|
|
locked := m.m.TryLock()
|
|
if !locked {
|
|
noteUnlock(unsafe.Pointer(m))
|
|
}
|
|
return locked
|
|
}
|