Class: Cute::Synchronization::Semaphore
- Inherits:
-
Object
- Object
- Cute::Synchronization::Semaphore
- Defined in:
- lib/cute/synchronization.rb
Instance Method Summary collapse
- #acquire(n = 1) ⇒ Object
-
#initialize(max) ⇒ Semaphore
constructor
A new instance of Semaphore.
- #relaxed_acquire(n = 1) ⇒ Object
- #release(n = 1) ⇒ Object
Constructor Details
#initialize(max) ⇒ Semaphore
Returns a new instance of Semaphore.
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# File 'lib/cute/synchronization.rb', line 6 def initialize(max) @lock = Mutex.new @cond = ConditionVariable.new @used = 0 @max = max end |
Instance Method Details
#acquire(n = 1) ⇒ Object
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# File 'lib/cute/synchronization.rb', line 13 def acquire(n = 1) @lock.synchronize { while (n > (@max - @used)) do @cond.wait(@lock) end @used += n } end |
#relaxed_acquire(n = 1) ⇒ Object
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# File 'lib/cute/synchronization.rb', line 22 def relaxed_acquire(n = 1) taken = 0 @lock.synchronize { while (@max == @used) do @cond.wait(@lock) end taken = (n + @used) > @max ? @max - @used : n @used += taken } return n - taken end |
#release(n = 1) ⇒ Object
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# File 'lib/cute/synchronization.rb', line 34 def release(n = 1) @lock.synchronize { @used -= n @cond.signal } end |