75 lines
1.9 KiB
Ruby
75 lines
1.9 KiB
Ruby
require 'mach/functions'
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require 'mach/port'
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require 'mach/host'
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require 'mach/clock'
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module Mach
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class Semaphore < Port
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include Functions
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# Create a new Semaphore.
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#
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# @param [Hash] opts
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#
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# @option opts [Integer] :value the initial value of the
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# semaphore; defaults to 1
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#
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# @option opts [Integer] :task the Mach task that owns the
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# semaphore (defaults to Mach.task_self)
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#
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# @options opts [Integer] :sync_policy the sync policy for this
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# semaphore (defaults to SyncPolicy::FIFO)
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#
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# @options opts [Integer] :port existing port to wrap with a
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# Semaphore object; otherwise a new semaphore is created
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#
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# @return [Integer] a semaphore port name
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def initialize(opts = {})
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value = opts[:value] || 1
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task = (opts[:task] && opts[:task].to_i) || ipc_space || mach_task_self
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sync_policy = opts[:sync_policy] || :fifo
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port = if opts[:port]
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opts[:port].to_i
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else
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mem = new_memory_pointer(:semaphore_t)
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semaphore_create(task, mem, sync_policy, value)
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mem.get_uint(0)
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end
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super(:port => port, :ipc_space => task)
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end
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# Destroy a Semaphore.
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#
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# @param [Hash] opts
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#
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# @option opts [Integer] :task the Mach task that owns the
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# semaphore (defaults to the owning task)
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def destroy(opts = {})
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task = opts[:task] || ipc_space || mach_task_self
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semaphore_destroy(task.to_i, port)
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end
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def signal
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semaphore_signal(port)
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end
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def signal_all
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semaphore_signal_all(port)
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end
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def wait
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semaphore_wait(port)
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end
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# @see http://pkaudio.blogspot.com/2010/05/mac-os-x-no-timed-semaphore-waits.html
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def timedwait(secs)
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timespec = TimeSpec.new
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timespec.add_seconds!(secs)
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semaphore_timedwait(port, timespec)
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end
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end
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end
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