Modify args to Semaphore and Port constructors to accept existing ports.

lib/mach/functions.rb

@@ -1,3 +1,5 @@
+require 'ffi'
+
 module Mach
   # FFI wrapper around a subset of the Mach API (likely Mac OS X
   # specific).
@@ -212,13 +214,13 @@ module Mach
 
     attach_mach_function(:task_get_special_port,
                          [:task_t,
-                          :int,
+                          MachSpecialPort,
                           :mach_port_pointer_t],
                          :kern_return_t)
 
     attach_mach_function(:task_set_special_port,
                          [:task_t,
-                          :int,
+                          MachSpecialPort,
                           :mach_port_t],
                          :kern_return_t)
 

lib/mach/port.rb

@@ -6,20 +6,27 @@ module Mach
 
     attr_reader :ipc_space, :port
 
-    # either initialize(port, opts) -or- initialize(opts)
-    def initialize(opts = {}, opts2 = {})
+    # @param [Hash] opts
+    #
+    # @option opts [Integer] :ipc_space defaults to +mach_task_self+
+    #
+    # @option opts [MachPortRight] :right defaults to +:receive+
+    #
+    # @option opts [Port, Integer] :port if given, the existing port
+    # is wrapped in a new Port object; otherwise a new port is
+    # allocated according to the other options
+    def initialize(opts = {})
       if opts.kind_of? Hash
-        ipc_space = opts[:ipc_space] || mach_task_self
+        @ipc_space = opts[:ipc_space] || mach_task_self
         right = opts[:right] || :receive
 
-        mem = new_memory_pointer(:mach_port_right_t)
-        mach_port_allocate(ipc_space, right, mem)
-
-        @port = mem.get_uint(0)
-        @ipc_space = ipc_space
+        @port = if opts[:port]
+                  opts[:port].kind_of?(Port) ? opts[:port].port : opts[:port]
                 else
-        @port = opts
-        @ipc_space = opts2[:ipc_space] || mach_task_self
+                  mem = new_memory_pointer(:mach_port_right_t)
+                  mach_port_allocate(@ipc_space, right, mem)
+                  mem.get_uint(0)
+                end
       end
     end
 

lib/mach/semaphore.rb

@@ -7,24 +7,35 @@ module Mach
 
     # Create a new Semaphore.
     #
-    # @param [Integer] value the initial value of the semaphore
-    #
     # @param [Hash] opts
     #
+    # @option opts [Integer] :value the initial value of the
+    # semaphore; defaults to 1
+    #
     # @option opts [Integer] :task the Mach task that owns the
     # semaphore (defaults to Mach.task_self)
     #
     # @options opts [Integer] :sync_policy the sync policy for this
     # semaphore (defaults to SyncPolicy::FIFO)
     #
+    # @options opts [Integer] :port existing port to wrap with a
+    # Semaphore object; otherwise a new semaphore is created
+    #
     # @return [Integer] a semaphore port name
-    def initialize(value = 1, opts = {})
+    def initialize(opts = {})
+      value = opts[:value] || 1
       task = opts[:task] || ipc_space || mach_task_self
       sync_policy = opts[:sync_policy] || :fifo
 
+      port = if opts[:port]
+               opts[:port]
+             else
                mem = new_memory_pointer(:semaphore_t)
                semaphore_create(task, mem, sync_policy, value)
-      super(mem.get_uint(0), :ipc_space => task)
+               mem.get_uint(0)
+             end
+
+      super(:port => port, :ipc_space => task)
     end
 
     # Destroy a Semaphore.

lib/mach/task.rb

@@ -11,17 +11,20 @@ module Mach
     end
 
     def initialize(task)
-      super(task)
+      super(:port => task)
     end
 
     alias_method :task, :port
 
+    # @param [MachSpecialPort] which_port
     def get_special_port(which_port)
       mem = FFI::MemoryPointer.new(:int)
       task_get_special_port(task, which_port, mem)
-      Port.new(mem.get_int(0))
+      Port.new(:port => mem.get_int(0))
     end
 
+    # @param [MachSpecialPort] which_port
+    #
     # @param [Port,Integer] newport
     def set_special_port(which_port, newport)
       p = newport.respond_to?(:port) ? newport.port : newport

spec/mach/semaphore_spec.rb

@@ -20,12 +20,12 @@ module Mach
     end
 
     it 'raises exception with invalid args' do
-      p = proc { Semaphore.new(1, :sync_policy => :no_such) }
+      p = proc { Semaphore.new(:sync_policy => :no_such) }
       p.must_raise ArgumentError # Error::INVALID_ARGUMENT
     end
 
     it 'signals/waits in same task' do
-      sem = Semaphore.new(0)
+      sem = Semaphore.new(:value => 0)
       sem.signal
       sem.wait
       sem.destroy