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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_MAC_SCOPED_MACH_PORT_H_
#define BASE_MAC_SCOPED_MACH_PORT_H_
#include <mach/mach.h>
#include "base/base_export.h"
#include "base/scoped_generic.h"
namespace base {
namespace mac {
namespace internal {
struct BASE_EXPORT SendRightTraits {
static mach_port_t InvalidValue() {
return MACH_PORT_NULL;
}
BASE_EXPORT static void Free(mach_port_t port);
};
struct BASE_EXPORT ReceiveRightTraits {
static mach_port_t InvalidValue() {
return MACH_PORT_NULL;
}
BASE_EXPORT static void Free(mach_port_t port);
};
struct PortSetTraits {
static mach_port_t InvalidValue() {
return MACH_PORT_NULL;
}
BASE_EXPORT static void Free(mach_port_t port);
};
} // namespace internal
// A scoper for handling a Mach port that names a send right. Send rights are
// reference counted, and this takes ownership of the right on construction
// and then removes a reference to the right on destruction. If the reference
// is the last one on the right, the right is deallocated.
class BASE_EXPORT ScopedMachSendRight :
public base::ScopedGeneric<mach_port_t, internal::SendRightTraits> {
public:
explicit ScopedMachSendRight(mach_port_t port = traits_type::InvalidValue())
: ScopedGeneric(port) {}
operator mach_port_t() const { return get(); }
};
// A scoper for handling a Mach port's receive right. There is only one
// receive right per port. This takes ownership of the receive right on
// construction and then destroys the right on destruction, turning all
// outstanding send rights into dead names.
class BASE_EXPORT ScopedMachReceiveRight :
public base::ScopedGeneric<mach_port_t, internal::ReceiveRightTraits> {
public:
explicit ScopedMachReceiveRight(
mach_port_t port = traits_type::InvalidValue()) : ScopedGeneric(port) {}
operator mach_port_t() const { return get(); }
};
// A scoper for handling a Mach port set. A port set can have only one
// reference. This takes ownership of that single reference on construction and
// destroys the port set on destruction. Destroying a port set does not destroy
// the receive rights that are members of the port set.
class BASE_EXPORT ScopedMachPortSet :
public ScopedGeneric<mach_port_t, internal::PortSetTraits> {
public:
explicit ScopedMachPortSet(mach_port_t port = traits_type::InvalidValue())
: ScopedGeneric(port) {}
operator mach_port_t() const { return get(); }
};
} // namespace mac
} // namespace base
#endif // BASE_MAC_SCOPED_MACH_PORT_H_
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