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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef BASE_MAC_SCOPED_MACH_PORT_H_
      6 #define BASE_MAC_SCOPED_MACH_PORT_H_
      7 
      8 #include <mach/mach.h>
      9 
     10 #include "base/base_export.h"
     11 #include "base/scoped_generic.h"
     12 
     13 namespace base {
     14 namespace mac {
     15 
     16 namespace internal {
     17 
     18 struct BASE_EXPORT SendRightTraits {
     19   static mach_port_t InvalidValue() {
     20     return MACH_PORT_NULL;
     21   }
     22 
     23   BASE_EXPORT static void Free(mach_port_t port);
     24 };
     25 
     26 struct BASE_EXPORT ReceiveRightTraits {
     27   static mach_port_t InvalidValue() {
     28     return MACH_PORT_NULL;
     29   }
     30 
     31   BASE_EXPORT static void Free(mach_port_t port);
     32 };
     33 
     34 struct PortSetTraits {
     35   static mach_port_t InvalidValue() {
     36     return MACH_PORT_NULL;
     37   }
     38 
     39   BASE_EXPORT static void Free(mach_port_t port);
     40 };
     41 
     42 }  // namespace internal
     43 
     44 // A scoper for handling a Mach port that names a send right. Send rights are
     45 // reference counted, and this takes ownership of the right on construction
     46 // and then removes a reference to the right on destruction. If the reference
     47 // is the last one on the right, the right is deallocated.
     48 using ScopedMachSendRight =
     49     ScopedGeneric<mach_port_t, internal::SendRightTraits>;
     50 
     51 // A scoper for handling a Mach port's receive right. There is only one
     52 // receive right per port. This takes ownership of the receive right on
     53 // construction and then destroys the right on destruction, turning all
     54 // outstanding send rights into dead names.
     55 using ScopedMachReceiveRight =
     56     ScopedGeneric<mach_port_t, internal::ReceiveRightTraits>;
     57 
     58 // A scoper for handling a Mach port set. A port set can have only one
     59 // reference. This takes ownership of that single reference on construction and
     60 // destroys the port set on destruction. Destroying a port set does not destroy
     61 // the receive rights that are members of the port set.
     62 using ScopedMachPortSet = ScopedGeneric<mach_port_t, internal::PortSetTraits>;
     63 
     64 }  // namespace mac
     65 }  // namespace base
     66 
     67 #endif  // BASE_MAC_SCOPED_MACH_PORT_H_
     68