c237633d34
The sync package is strongly tied to the runtime, so it's easier to implement a new one. Besides, it's pretty big so it's better to replace it.
52 строки
762 Б
Go
52 строки
762 Б
Go
package sync
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// These mutexes assume there is only one thread of operation: no goroutines,
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// interrupts or anything else.
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type Mutex struct {
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locked bool
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}
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func (m *Mutex) Lock() {
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if m.locked {
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panic("todo: block on locked mutex")
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}
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m.locked = true
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}
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func (m *Mutex) Unlock() {
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if !m.locked {
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panic("sync: unlock of unlocked Mutex")
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}
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m.locked = false
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}
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type RWMutex struct {
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m Mutex
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readers uint32
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}
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func (rw *RWMutex) Lock() {
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rw.m.Lock()
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}
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func (rw *RWMutex) Unlock() {
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rw.m.Unlock()
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}
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func (rw *RWMutex) RLock() {
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if rw.readers == 0 {
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rw.m.Lock()
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}
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rw.readers++
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}
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func (rw *RWMutex) RUnlock() {
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if rw.readers == 0 {
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panic("sync: unlock of unlocked RWMutex")
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}
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rw.readers--
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if rw.readers == 0 {
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rw.m.Unlock()
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}
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}
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