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Ayke van Laethem
5a1b885024
The mutex implementation needs a different implementation once support for threading lands. This implementation just moves code to the internal/task package to centralize these algorithms.
44 lines
783 B
Go
44 lines
783 B
Go
package task
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type Mutex struct {
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locked bool
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blocked Stack
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}
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func (m *Mutex) Lock() {
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if m.locked {
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// Push self onto stack of blocked tasks, and wait to be resumed.
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m.blocked.Push(Current())
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Pause()
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return
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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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// Wake up a blocked task, if applicable.
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if t := m.blocked.Pop(); t != nil {
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scheduleTask(t)
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} else {
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m.locked = false
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}
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}
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// TryLock tries to lock m and reports whether it succeeded.
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//
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// Note that while correct uses of TryLock do exist, they are rare,
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// and use of TryLock is often a sign of a deeper problem
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// in a particular use of mutexes.
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func (m *Mutex) TryLock() bool {
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if m.locked {
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return false
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}
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m.Lock()
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return true
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}
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