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// Copyright 2013 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.
#include "mojo/system/message_pipe_dispatcher.h"
#include "base/logging.h"
#include "mojo/system/constants.h"
#include "mojo/system/memory.h"
#include "mojo/system/message_pipe.h"
namespace mojo {
namespace system {
const unsigned kInvalidPort = static_cast<unsigned>(-1);
MessagePipeDispatcher::MessagePipeDispatcher()
: port_(kInvalidPort) {
}
void MessagePipeDispatcher::Init(scoped_refptr<MessagePipe> message_pipe,
unsigned port) {
DCHECK(message_pipe.get());
DCHECK(port == 0 || port == 1);
message_pipe_ = message_pipe;
port_ = port;
}
MessagePipe* MessagePipeDispatcher::GetMessagePipeNoLock() const {
lock().AssertAcquired();
return message_pipe_.get();
}
unsigned MessagePipeDispatcher::GetPortNoLock() const {
lock().AssertAcquired();
return port_;
}
Dispatcher::Type MessagePipeDispatcher::GetType() {
return kTypeMessagePipe;
}
MessagePipeDispatcher::~MessagePipeDispatcher() {
// |Close()|/|CloseImplNoLock()| should have taken care of the pipe.
DCHECK(!message_pipe_.get());
}
void MessagePipeDispatcher::CancelAllWaitersNoLock() {
lock().AssertAcquired();
message_pipe_->CancelAllWaiters(port_);
}
void MessagePipeDispatcher::CloseImplNoLock() {
lock().AssertAcquired();
message_pipe_->Close(port_);
message_pipe_ = NULL;
port_ = kInvalidPort;
}
MojoResult MessagePipeDispatcher::WriteMessageImplNoLock(
const void* bytes, uint32_t num_bytes,
const std::vector<Dispatcher*>* dispatchers,
MojoWriteMessageFlags flags) {
DCHECK(!dispatchers || (dispatchers->size() > 0 &&
dispatchers->size() <= kMaxMessageNumHandles));
lock().AssertAcquired();
if (!VerifyUserPointer<void>(bytes, num_bytes))
return MOJO_RESULT_INVALID_ARGUMENT;
if (num_bytes > kMaxMessageNumBytes)
return MOJO_RESULT_RESOURCE_EXHAUSTED;
return message_pipe_->WriteMessage(port_,
bytes, num_bytes,
dispatchers,
flags);
}
MojoResult MessagePipeDispatcher::ReadMessageImplNoLock(
void* bytes, uint32_t* num_bytes,
std::vector<scoped_refptr<Dispatcher> >* dispatchers,
uint32_t* num_dispatchers,
MojoReadMessageFlags flags) {
lock().AssertAcquired();
if (num_bytes) {
if (!VerifyUserPointer<uint32_t>(num_bytes, 1))
return MOJO_RESULT_INVALID_ARGUMENT;
if (!VerifyUserPointer<void>(bytes, *num_bytes))
return MOJO_RESULT_INVALID_ARGUMENT;
}
return message_pipe_->ReadMessage(port_,
bytes, num_bytes,
dispatchers, num_dispatchers,
flags);
}
MojoResult MessagePipeDispatcher::AddWaiterImplNoLock(Waiter* waiter,
MojoWaitFlags flags,
MojoResult wake_result) {
lock().AssertAcquired();
return message_pipe_->AddWaiter(port_, waiter, flags, wake_result);
}
void MessagePipeDispatcher::RemoveWaiterImplNoLock(Waiter* waiter) {
lock().AssertAcquired();
message_pipe_->RemoveWaiter(port_, waiter);
}
scoped_refptr<Dispatcher>
MessagePipeDispatcher::CreateEquivalentDispatcherAndCloseImplNoLock() {
lock().AssertAcquired();
scoped_refptr<MessagePipeDispatcher> rv = new MessagePipeDispatcher();
rv->Init(message_pipe_, port_);
message_pipe_ = NULL;
port_ = kInvalidPort;
return scoped_refptr<Dispatcher>(rv.get());
}
} // namespace system
} // namespace mojo
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