raw_channel.cc revision effb81e5f8246d0db0270817048dc992db66e9fb
1a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)// Copyright 2014 The Chromium Authors. All rights reserved. 2a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 3a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)// found in the LICENSE file. 4a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 5a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#include "mojo/system/raw_channel.h" 6a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 7a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#include <string.h> 8a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 9a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#include <algorithm> 10a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 11a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#include "base/bind.h" 12a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#include "base/location.h" 13a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#include "base/logging.h" 14a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#include "base/message_loop/message_loop.h" 15a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#include "base/stl_util.h" 16a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#include "mojo/system/message_in_transit.h" 17a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 18a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)namespace mojo { 19a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)namespace system { 20a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 21a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)const size_t kReadSize = 4096; 22a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 23a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)RawChannel::ReadBuffer::ReadBuffer() : buffer_(kReadSize), num_valid_bytes_(0) { 24a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 25a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 26a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)RawChannel::ReadBuffer::~ReadBuffer() {} 27a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 28a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)void RawChannel::ReadBuffer::GetBuffer(char** addr, size_t* size) { 29a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_GE(buffer_.size(), num_valid_bytes_ + kReadSize); 30a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) *addr = &buffer_[0] + num_valid_bytes_; 31a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) *size = kReadSize; 32a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 33a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 34a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)RawChannel::WriteBuffer::WriteBuffer() : offset_(0) {} 35a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 36a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)RawChannel::WriteBuffer::~WriteBuffer() { 37a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) STLDeleteElements(&message_queue_); 38a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 39a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 40a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)void RawChannel::WriteBuffer::GetBuffers(std::vector<Buffer>* buffers) const { 41a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) buffers->clear(); 42a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 43a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) size_t bytes_to_write = GetTotalBytesToWrite(); 44a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (bytes_to_write == 0) 45a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return; 46a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 47a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) MessageInTransit* message = message_queue_.front(); 48a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (!message->secondary_buffer_size()) { 49a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Only write from the main buffer. 50a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_LT(offset_, message->main_buffer_size()); 51a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_LE(bytes_to_write, message->main_buffer_size()); 52a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) Buffer buffer = { 53a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) static_cast<const char*>(message->main_buffer()) + offset_, 54a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) bytes_to_write}; 55a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) buffers->push_back(buffer); 56a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return; 57a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 58a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 59a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (offset_ >= message->main_buffer_size()) { 60a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Only write from the secondary buffer. 61a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_LT(offset_ - message->main_buffer_size(), 62a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) message->secondary_buffer_size()); 63a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_LE(bytes_to_write, message->secondary_buffer_size()); 64a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) Buffer buffer = { 65a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) static_cast<const char*>(message->secondary_buffer()) + 66a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) (offset_ - message->main_buffer_size()), 67a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) bytes_to_write}; 68a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) buffers->push_back(buffer); 69a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return; 70a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 71a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 72a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Write from both buffers. 73a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_EQ(bytes_to_write, message->main_buffer_size() - offset_ + 74a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) message->secondary_buffer_size()); 75a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) Buffer buffer1 = { 76a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) static_cast<const char*>(message->main_buffer()) + offset_, 77a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) message->main_buffer_size() - offset_}; 78a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) buffers->push_back(buffer1); 79a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) Buffer buffer2 = { 80a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) static_cast<const char*>(message->secondary_buffer()), 81a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) message->secondary_buffer_size()}; 82a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) buffers->push_back(buffer2); 83a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 84a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 85a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)size_t RawChannel::WriteBuffer::GetTotalBytesToWrite() const { 86a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (message_queue_.empty()) 87a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return 0; 88a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 89a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) MessageInTransit* message = message_queue_.front(); 90a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_LT(offset_, message->total_size()); 91a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return message->total_size() - offset_; 92a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 93a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 94a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)RawChannel::RawChannel(Delegate* delegate, 95a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) base::MessageLoopForIO* message_loop_for_io) 96a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) : delegate_(delegate), 97a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) message_loop_for_io_(message_loop_for_io), 98a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) read_stopped_(false), 99a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_stopped_(false), 100a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) weak_ptr_factory_(this) { 101a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 102a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 103a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)RawChannel::~RawChannel() { 104a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK(!read_buffer_); 105a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK(!write_buffer_); 106a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 107a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // No need to take the |write_lock_| here -- if there are still weak pointers 108a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // outstanding, then we're hosed anyway (since we wouldn't be able to 109a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // invalidate them cleanly, since we might not be on the I/O thread). 110a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK(!weak_ptr_factory_.HasWeakPtrs()); 111a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 112a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 113a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)bool RawChannel::Init() { 114a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_EQ(base::MessageLoop::current(), message_loop_for_io_); 115a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 116a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // No need to take the lock. No one should be using us yet. 117a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK(!read_buffer_); 118a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) read_buffer_.reset(new ReadBuffer); 119a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK(!write_buffer_); 120a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_buffer_.reset(new WriteBuffer); 121a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 122a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (!OnInit()) 123a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return false; 124a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 125a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return ScheduleRead() == IO_PENDING; 126a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 127a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 128a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)void RawChannel::Shutdown() { 129a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_EQ(base::MessageLoop::current(), message_loop_for_io_); 130a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 131a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) base::AutoLock locker(write_lock_); 132a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 133effb81e5f8246d0db0270817048dc992db66e9fbBen Murdoch LOG_IF(WARNING, !write_buffer_->message_queue_.empty()) 134effb81e5f8246d0db0270817048dc992db66e9fbBen Murdoch << "Shutting down RawChannel with write buffer nonempty"; 135effb81e5f8246d0db0270817048dc992db66e9fbBen Murdoch 136a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) weak_ptr_factory_.InvalidateWeakPtrs(); 137a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 138a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) read_stopped_ = true; 139a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_stopped_ = true; 140a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 141a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) OnShutdownNoLock(read_buffer_.Pass(), write_buffer_.Pass()); 142a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 143a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 144a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)// Reminder: This must be thread-safe. 145a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)bool RawChannel::WriteMessage(scoped_ptr<MessageInTransit> message) { 146a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) base::AutoLock locker(write_lock_); 147a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (write_stopped_) 148a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return false; 149a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 150a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (!write_buffer_->message_queue_.empty()) { 151a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_buffer_->message_queue_.push_back(message.release()); 152a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return true; 153a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 154a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 155a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_buffer_->message_queue_.push_front(message.release()); 156a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_EQ(write_buffer_->offset_, 0u); 157a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 158a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) size_t bytes_written = 0; 159a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) IOResult io_result = WriteNoLock(&bytes_written); 160a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (io_result == IO_PENDING) 161a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return true; 162a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 163a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) bool result = OnWriteCompletedNoLock(io_result == IO_SUCCEEDED, 164a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) bytes_written); 165a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (!result) { 166a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Even if we're on the I/O thread, don't call |OnFatalError()| in the 167a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // nested context. 168a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) message_loop_for_io_->PostTask( 169a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) FROM_HERE, 170a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) base::Bind(&RawChannel::CallOnFatalError, 171a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) weak_ptr_factory_.GetWeakPtr(), 172a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) Delegate::FATAL_ERROR_FAILED_WRITE)); 173a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 174a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 175a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return result; 176a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 177a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 178effb81e5f8246d0db0270817048dc992db66e9fbBen Murdoch// Reminder: This must be thread-safe. 179effb81e5f8246d0db0270817048dc992db66e9fbBen Murdochbool RawChannel::IsWriteBufferEmpty() { 180effb81e5f8246d0db0270817048dc992db66e9fbBen Murdoch base::AutoLock locker(write_lock_); 181effb81e5f8246d0db0270817048dc992db66e9fbBen Murdoch return write_buffer_->message_queue_.empty(); 182effb81e5f8246d0db0270817048dc992db66e9fbBen Murdoch} 183effb81e5f8246d0db0270817048dc992db66e9fbBen Murdoch 184a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)RawChannel::ReadBuffer* RawChannel::read_buffer() { 185a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_EQ(base::MessageLoop::current(), message_loop_for_io_); 186a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return read_buffer_.get(); 187a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 188a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 189a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)RawChannel::WriteBuffer* RawChannel::write_buffer_no_lock() { 190a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_lock_.AssertAcquired(); 191a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return write_buffer_.get(); 192a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 193a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 194a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)void RawChannel::OnReadCompleted(bool result, size_t bytes_read) { 195a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_EQ(base::MessageLoop::current(), message_loop_for_io_); 196a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 197a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (read_stopped_) { 198a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) NOTREACHED(); 199a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return; 200a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 201a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 202a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) IOResult io_result = result ? IO_SUCCEEDED : IO_FAILED; 203a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 204a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Keep reading data in a loop, and dispatch messages if enough data is 205a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // received. Exit the loop if any of the following happens: 206a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // - one or more messages were dispatched; 207a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // - the last read failed, was a partial read or would block; 208a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // - |Shutdown()| was called. 209a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) do { 210a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (io_result != IO_SUCCEEDED) { 211a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) read_stopped_ = true; 212a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) CallOnFatalError(Delegate::FATAL_ERROR_FAILED_READ); 213a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return; 214a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 215a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 216a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) read_buffer_->num_valid_bytes_ += bytes_read; 217a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 218a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Dispatch all the messages that we can. 219a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) bool did_dispatch_message = false; 220a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Tracks the offset of the first undispatched message in |read_buffer_|. 221a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Currently, we copy data to ensure that this is zero at the beginning. 222a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) size_t read_buffer_start = 0; 223a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) size_t remaining_bytes = read_buffer_->num_valid_bytes_; 224a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) size_t message_size; 225a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Note that we rely on short-circuit evaluation here: 226a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // - |read_buffer_start| may be an invalid index into 227a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // |read_buffer_->buffer_| if |remaining_bytes| is zero. 228a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // - |message_size| is only valid if |GetNextMessageSize()| returns true. 229a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // TODO(vtl): Use |message_size| more intelligently (e.g., to request the 230a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // next read). 231a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // TODO(vtl): Validate that |message_size| is sane. 232a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) while (remaining_bytes > 0 && 233a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) MessageInTransit::GetNextMessageSize( 234a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) &read_buffer_->buffer_[read_buffer_start], remaining_bytes, 235a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) &message_size) && 236a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) remaining_bytes >= message_size) { 237a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) MessageInTransit::View 238a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) message_view(message_size, &read_buffer_->buffer_[read_buffer_start]); 239a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_EQ(message_view.total_size(), message_size); 240a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 241a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Dispatch the message. 242a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) delegate_->OnReadMessage(message_view); 243a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (read_stopped_) { 244a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // |Shutdown()| was called in |OnReadMessage()|. 245a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // TODO(vtl): Add test for this case. 246a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return; 247a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 248a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) did_dispatch_message = true; 249a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 250a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Update our state. 251a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) read_buffer_start += message_size; 252a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) remaining_bytes -= message_size; 253a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 254a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 255a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (read_buffer_start > 0) { 256a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Move data back to start. 257a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) read_buffer_->num_valid_bytes_ = remaining_bytes; 258a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (read_buffer_->num_valid_bytes_ > 0) { 259a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) memmove(&read_buffer_->buffer_[0], 260a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) &read_buffer_->buffer_[read_buffer_start], remaining_bytes); 261a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 262a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) read_buffer_start = 0; 263a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 264a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 265a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (read_buffer_->buffer_.size() - read_buffer_->num_valid_bytes_ < 266a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) kReadSize) { 267a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Use power-of-2 buffer sizes. 268a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // TODO(vtl): Make sure the buffer doesn't get too large (and enforce the 269a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // maximum message size to whatever extent necessary). 270a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // TODO(vtl): We may often be able to peek at the header and get the real 271a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // required extra space (which may be much bigger than |kReadSize|). 272a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) size_t new_size = std::max(read_buffer_->buffer_.size(), kReadSize); 273a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) while (new_size < read_buffer_->num_valid_bytes_ + kReadSize) 274a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) new_size *= 2; 275a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 276a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // TODO(vtl): It's suboptimal to zero out the fresh memory. 277a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) read_buffer_->buffer_.resize(new_size, 0); 278a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 279a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 280a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // (1) If we dispatched any messages, stop reading for now (and let the 281a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // message loop do its thing for another round). 282a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // TODO(vtl): Is this the behavior we want? (Alternatives: i. Dispatch only 283a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // a single message. Risks: slower, more complex if we want to avoid lots of 284a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // copying. ii. Keep reading until there's no more data and dispatch all the 285a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // messages we can. Risks: starvation of other users of the message loop.) 286a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // (2) If we didn't max out |kReadSize|, stop reading for now. 287a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) bool schedule_for_later = did_dispatch_message || bytes_read < kReadSize; 288a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) bytes_read = 0; 289a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) io_result = schedule_for_later ? ScheduleRead() : Read(&bytes_read); 290a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } while (io_result != IO_PENDING); 291a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 292a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 293a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)void RawChannel::OnWriteCompleted(bool result, size_t bytes_written) { 294a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_EQ(base::MessageLoop::current(), message_loop_for_io_); 295a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 296a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) bool did_fail = false; 297a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) { 298a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) base::AutoLock locker(write_lock_); 299a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_EQ(write_stopped_, write_buffer_->message_queue_.empty()); 300a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 301a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (write_stopped_) { 302a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) NOTREACHED(); 303a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return; 304a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 305a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 306a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) did_fail = !OnWriteCompletedNoLock(result, bytes_written); 307a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 308a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 309a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (did_fail) 310a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) CallOnFatalError(Delegate::FATAL_ERROR_FAILED_WRITE); 311a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 312a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 313a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)void RawChannel::CallOnFatalError(Delegate::FatalError fatal_error) { 314a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_EQ(base::MessageLoop::current(), message_loop_for_io_); 315a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // TODO(vtl): Add a "write_lock_.AssertNotAcquired()"? 316a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) delegate_->OnFatalError(fatal_error); 317a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 318a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 319a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)bool RawChannel::OnWriteCompletedNoLock(bool result, size_t bytes_written) { 320a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_lock_.AssertAcquired(); 321a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 322a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK(!write_stopped_); 323a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK(!write_buffer_->message_queue_.empty()); 324a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 325a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (result) { 326a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (bytes_written < write_buffer_->GetTotalBytesToWrite()) { 327a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Partial (or no) write. 328a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_buffer_->offset_ += bytes_written; 329a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } else { 330a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Complete write. 331a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) DCHECK_EQ(bytes_written, write_buffer_->GetTotalBytesToWrite()); 332a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) delete write_buffer_->message_queue_.front(); 333a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_buffer_->message_queue_.pop_front(); 334a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_buffer_->offset_ = 0; 335a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 336a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 337a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (write_buffer_->message_queue_.empty()) 338a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return true; 339a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 340a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) // Schedule the next write. 341a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) if (ScheduleWriteNoLock() == IO_PENDING) 342a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return true; 343a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) } 344a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 345a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_stopped_ = true; 346a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) STLDeleteElements(&write_buffer_->message_queue_); 347a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) write_buffer_->offset_ = 0; 348a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) return false; 349a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} 350a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 351a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} // namespace system 352a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)} // namespace mojo 353