54 lines
950 B
Ruby
54 lines
950 B
Ruby
require 'process_shared'
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module ProcessShared
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class ConditionVariable
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def initialize
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@internal = Semaphore.new(1)
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@waiting = SharedMemory.new(:int)
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@waiting.write_int(0)
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@sem = Semaphore.new(0)
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end
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def broadcast
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@internal.synchronize do
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@waiting.read_int.times { @sem.post }
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end
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end
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def signal
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@sem.post
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end
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def wait(mutex, timeout = nil)
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mutex.unlock
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begin
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inc_waiting
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if timeout
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begin
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@sem.try_wait(timeout)
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rescue Errno::EAGAIN, Errno::ETIMEDOUT
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# success!
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end
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else
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@sem.wait
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end
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dec_waiting
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ensure
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mutex.lock
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end
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end
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private
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def inc_waiting(val = 1)
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@internal.synchronize do
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@waiting.write_int(@waiting.read_int + val)
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end
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end
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def dec_waiting
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inc_waiting(-1)
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end
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end
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end
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