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rwlock.go
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rwlock.go
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package client
import (
"errors"
"github.com/snower/slock/protocol"
"sync"
)
type RWLock struct {
db *Database
lockKey [16]byte
timeout uint32
expried uint32
rlocks []*Lock
wlock *Lock
glock *sync.Mutex
}
func NewRWLock(db *Database, lockKey [16]byte, timeout uint32, expried uint32) *RWLock {
return &RWLock{db, lockKey, timeout, expried, make([]*Lock, 0), nil, &sync.Mutex{}}
}
func (self *RWLock) GetLockKey() [16]byte {
return self.lockKey
}
func (self *RWLock) GetTimeout() uint32 {
return self.timeout
}
func (self *RWLock) GetExpried() uint32 {
return self.expried
}
func (self *RWLock) RLock() (*protocol.LockResultCommand, error) {
rlock := &Lock{self.db, self.db.GenLockId(), self.lockKey, self.timeout, self.expried, 0xffff, 0}
result, err := rlock.Lock()
if err == nil {
self.glock.Lock()
self.rlocks = append(self.rlocks, rlock)
self.glock.Unlock()
}
return result, err
}
func (self *RWLock) RLockWithData(data *protocol.LockCommandData) (*protocol.LockResultCommand, error) {
rlock := &Lock{self.db, self.db.GenLockId(), self.lockKey, self.timeout, self.expried, 0xffff, 0}
result, err := rlock.LockWithData(data)
if err == nil {
self.glock.Lock()
self.rlocks = append(self.rlocks, rlock)
self.glock.Unlock()
}
return result, err
}
func (self *RWLock) RUnlock() (*protocol.LockResultCommand, error) {
self.glock.Lock()
if len(self.rlocks) == 0 {
self.glock.Unlock()
return nil, &LockError{protocol.RESULT_UNLOCK_ERROR, nil, errors.New("rwlock is unlock")}
}
rlock := self.rlocks[0]
self.rlocks = self.rlocks[1:]
self.glock.Unlock()
return rlock.Unlock()
}
func (self *RWLock) RUnlockWithData(data *protocol.LockCommandData) (*protocol.LockResultCommand, error) {
self.glock.Lock()
if len(self.rlocks) == 0 {
self.glock.Unlock()
return nil, &LockError{protocol.RESULT_UNLOCK_ERROR, nil, errors.New("rwlock is unlock")}
}
rlock := self.rlocks[0]
self.rlocks = self.rlocks[1:]
self.glock.Unlock()
return rlock.UnlockWithData(data)
}
func (self *RWLock) Lock() (*protocol.LockResultCommand, error) {
self.glock.Lock()
if self.wlock == nil {
self.wlock = &Lock{self.db, self.db.GenLockId(), self.lockKey, self.timeout, self.expried, 0, 0}
}
self.glock.Unlock()
return self.wlock.Lock()
}
func (self *RWLock) LockWithData(data *protocol.LockCommandData) (*protocol.LockResultCommand, error) {
self.glock.Lock()
if self.wlock == nil {
self.wlock = &Lock{self.db, self.db.GenLockId(), self.lockKey, self.timeout, self.expried, 0, 0}
}
self.glock.Unlock()
return self.wlock.LockWithData(data)
}
func (self *RWLock) Unlock() (*protocol.LockResultCommand, error) {
self.glock.Lock()
if self.wlock == nil {
self.glock.Unlock()
return nil, &LockError{protocol.RESULT_UNLOCK_ERROR, nil, errors.New("rwlock is unlock")}
}
self.glock.Unlock()
return self.wlock.Unlock()
}
func (self *RWLock) UnlockWithData(data *protocol.LockCommandData) (*protocol.LockResultCommand, error) {
self.glock.Lock()
if self.wlock == nil {
self.glock.Unlock()
return nil, &LockError{protocol.RESULT_UNLOCK_ERROR, nil, errors.New("rwlock is unlock")}
}
self.glock.Unlock()
return self.wlock.UnlockWithData(data)
}