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package mutexes
import (
"sync"
"unsafe"
)
// Cond is similar to a sync.Cond{}, but
// it encompasses the Mutex{} within itself.
type Cond struct {
notify notifyList
sync.Mutex
}
// See: sync.Cond{}.Wait().
func (c *Cond) Wait() {
t := runtime_notifyListAdd(&c.notify)
c.Mutex.Unlock()
runtime_notifyListWait(&c.notify, t)
c.Mutex.Lock()
}
// See: sync.Cond{}.Signal().
func (c *Cond) Signal() { runtime_notifyListNotifyOne(&c.notify) }
// See: sync.Cond{}.Broadcast().
func (c *Cond) Broadcast() { runtime_notifyListNotifyAll(&c.notify) }
// RWCond is similar to a sync.Cond{}, but
// it encompasses the RWMutex{} within itself.
type RWCond struct {
notify notifyList
sync.RWMutex
}
// See: sync.Cond{}.Wait().
func (c *RWCond) Wait() {
t := runtime_notifyListAdd(&c.notify)
c.RWMutex.Unlock()
runtime_notifyListWait(&c.notify, t)
c.RWMutex.Lock()
}
// See: sync.Cond{}.Signal().
func (c *RWCond) Signal() { runtime_notifyListNotifyOne(&c.notify) }
// See: sync.Cond{}.Broadcast().
func (c *RWCond) Broadcast() { runtime_notifyListNotifyAll(&c.notify) }
// unused fields left
// un-named for safety.
type notifyList struct {
_ uint32 // wait uint32
notify uint32 // notify uint32
_ uintptr // lock mutex
_ unsafe.Pointer // head *sudog
_ unsafe.Pointer // tail *sudog
}
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListAdd sync.runtime_notifyListAdd
func runtime_notifyListAdd(l *notifyList) uint32
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListWait sync.runtime_notifyListWait
func runtime_notifyListWait(l *notifyList, t uint32)
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListNotifyOne sync.runtime_notifyListNotifyOne
func runtime_notifyListNotifyOne(l *notifyList)
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListNotifyAll sync.runtime_notifyListNotifyAll
func runtime_notifyListNotifyAll(l *notifyList)
// Ensure that sync and runtime agree on size of notifyList.
//
//go:linkname runtime_notifyListCheck sync.runtime_notifyListCheck
func runtime_notifyListCheck(size uintptr)
func init() {
var n notifyList
runtime_notifyListCheck(unsafe.Sizeof(n))
}
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