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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/data_pipe_consumer_dispatcher.h"
#include "base/logging.h"
#include "mojo/system/data_pipe.h"
#include "mojo/system/memory.h"
namespace mojo {
namespace system {
DataPipeConsumerDispatcher::DataPipeConsumerDispatcher() {
}
void DataPipeConsumerDispatcher::Init(scoped_refptr<DataPipe> data_pipe) {
DCHECK(data_pipe.get());
data_pipe_ = data_pipe;
}
DataPipeConsumerDispatcher::~DataPipeConsumerDispatcher() {
// |Close()|/|CloseImplNoLock()| should have taken care of the pipe.
DCHECK(!data_pipe_.get());
}
void DataPipeConsumerDispatcher::CancelAllWaitersNoLock() {
lock().AssertAcquired();
data_pipe_->ConsumerCancelAllWaiters();
}
MojoResult DataPipeConsumerDispatcher::CloseImplNoLock() {
lock().AssertAcquired();
data_pipe_->ConsumerClose();
data_pipe_ = NULL;
return MOJO_RESULT_OK;
}
MojoResult DataPipeConsumerDispatcher::ReadDataImplNoLock(
void* elements,
uint32_t* num_elements,
MojoReadDataFlags flags) {
lock().AssertAcquired();
if (!VerifyUserPointer<uint32_t>(num_elements, 1))
return MOJO_RESULT_INVALID_ARGUMENT;
// These flags are mutally exclusive.
if ((flags & MOJO_READ_DATA_FLAG_DISCARD) &&
(flags & MOJO_READ_DATA_FLAG_QUERY))
return MOJO_RESULT_INVALID_ARGUMENT;
if ((flags & MOJO_READ_DATA_FLAG_DISCARD) ||
(flags & MOJO_READ_DATA_FLAG_QUERY)) {
DVLOG_IF(2, elements) << "Discard/query mode: ignoring non-null |elements|";
elements = NULL; // Null it out for safety.
} else {
// Only verify |elements| if we're neither discarding nor querying.
if (!VerifyUserPointerForSize(elements, data_pipe_->element_size(),
*num_elements))
return MOJO_RESULT_INVALID_ARGUMENT;
}
return data_pipe_->ConsumerReadData(elements, num_elements, flags);
}
MojoResult DataPipeConsumerDispatcher::BeginReadDataImplNoLock(
const void** buffer,
uint32_t* buffer_num_elements,
MojoReadDataFlags flags) {
lock().AssertAcquired();
if (!VerifyUserPointer<const void*>(buffer, 1))
return MOJO_RESULT_INVALID_ARGUMENT;
if (!VerifyUserPointer<uint32_t>(buffer_num_elements, 1))
return MOJO_RESULT_INVALID_ARGUMENT;
// These flags may not be used in two-phase mode.
if ((flags & MOJO_READ_DATA_FLAG_DISCARD) ||
(flags & MOJO_READ_DATA_FLAG_QUERY))
return MOJO_RESULT_INVALID_ARGUMENT;
return data_pipe_->ConsumerBeginReadData(buffer, buffer_num_elements, flags);
}
MojoResult DataPipeConsumerDispatcher::EndReadDataImplNoLock(
uint32_t num_elements_read) {
lock().AssertAcquired();
return data_pipe_->ConsumerEndReadData(num_elements_read);
}
MojoResult DataPipeConsumerDispatcher::AddWaiterImplNoLock(
Waiter* waiter,
MojoWaitFlags flags,
MojoResult wake_result) {
lock().AssertAcquired();
return data_pipe_->ConsumerAddWaiter(waiter, flags, wake_result);
}
void DataPipeConsumerDispatcher::RemoveWaiterImplNoLock(Waiter* waiter) {
lock().AssertAcquired();
data_pipe_->ConsumerRemoveWaiter(waiter);
}
scoped_refptr<Dispatcher>
DataPipeConsumerDispatcher::CreateEquivalentDispatcherAndCloseImplNoLock() {
lock().AssertAcquired();
scoped_refptr<DataPipeConsumerDispatcher> rv =
new DataPipeConsumerDispatcher();
rv->Init(data_pipe_);
data_pipe_ = NULL;
return scoped_refptr<Dispatcher>(rv.get());
}
} // namespace system
} // namespace mojo
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