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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.h"
#include "base/logging.h"
#include "base/stl_util.h"
#include "mojo/system/local_message_pipe_endpoint.h"
#include "mojo/system/message_in_transit.h"
#include "mojo/system/message_pipe_endpoint.h"
namespace mojo {
namespace system {
namespace {
unsigned DestinationPortFromSourcePort(unsigned port) {
DCHECK(port == 0 || port == 1);
return port ^ 1;
}
} // namespace
MessagePipe::MessagePipe(scoped_ptr<MessagePipeEndpoint> endpoint_0,
scoped_ptr<MessagePipeEndpoint> endpoint_1) {
endpoints_[0].reset(endpoint_0.release());
endpoints_[1].reset(endpoint_1.release());
}
MessagePipe::MessagePipe() {
endpoints_[0].reset(new LocalMessagePipeEndpoint());
endpoints_[1].reset(new LocalMessagePipeEndpoint());
}
void MessagePipe::CancelAllWaiters(unsigned port) {
DCHECK(port == 0 || port == 1);
base::AutoLock locker(lock_);
DCHECK(endpoints_[port].get());
endpoints_[port]->CancelAllWaiters();
}
void MessagePipe::Close(unsigned port) {
DCHECK(port == 0 || port == 1);
unsigned destination_port = DestinationPortFromSourcePort(port);
base::AutoLock locker(lock_);
DCHECK(endpoints_[port].get());
endpoints_[port]->Close();
if (endpoints_[destination_port].get())
endpoints_[destination_port]->OnPeerClose();
endpoints_[port].reset();
}
// TODO(vtl): Handle flags.
MojoResult MessagePipe::WriteMessage(
unsigned port,
const void* bytes, uint32_t num_bytes,
const MojoHandle* handles, uint32_t num_handles,
MojoWriteMessageFlags flags) {
DCHECK(port == 0 || port == 1);
unsigned destination_port = DestinationPortFromSourcePort(port);
base::AutoLock locker(lock_);
DCHECK(endpoints_[port].get());
// The destination port need not be open, unlike the source port.
if (!endpoints_[destination_port].get())
return MOJO_RESULT_FAILED_PRECONDITION;
return endpoints_[destination_port]->EnqueueMessage(bytes, num_bytes,
handles, num_handles,
flags);
}
MojoResult MessagePipe::ReadMessage(unsigned port,
void* bytes, uint32_t* num_bytes,
MojoHandle* handles, uint32_t* num_handles,
MojoReadMessageFlags flags) {
DCHECK(port == 0 || port == 1);
base::AutoLock locker(lock_);
DCHECK(endpoints_[port].get());
return endpoints_[port]->ReadMessage(bytes, num_bytes,
handles, num_handles,
flags);
}
MojoResult MessagePipe::AddWaiter(unsigned port,
Waiter* waiter,
MojoWaitFlags flags,
MojoResult wake_result) {
DCHECK(port == 0 || port == 1);
base::AutoLock locker(lock_);
DCHECK(endpoints_[port].get());
return endpoints_[port]->AddWaiter(waiter, flags, wake_result);
}
void MessagePipe::RemoveWaiter(unsigned port, Waiter* waiter) {
DCHECK(port == 0 || port == 1);
base::AutoLock locker(lock_);
DCHECK(endpoints_[port].get());
endpoints_[port]->RemoveWaiter(waiter);
}
MessagePipe::~MessagePipe() {
// Owned by the dispatchers. The owning dispatchers should only release us via
// their |Close()| method, which should inform us of being closed via our
// |Close()|. Thus these should already be null.
DCHECK(!endpoints_[0].get());
DCHECK(!endpoints_[1].get());
}
} // namespace system
} // namespace mojo
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