15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/audio/cross_process_notification.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <errno.h> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <sys/poll.h> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/memory/scoped_ptr.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/file_descriptor_posix.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)CrossProcessNotification::~CrossProcessNotification() {} 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)CrossProcessNotification::CrossProcessNotification(IPCHandle handle_1, 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) IPCHandle handle_2) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : socket_(handle_1.fd) { 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_NE(handle_1.fd, -1); 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(handle_2.fd, -1); 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(IsValid()); 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void CrossProcessNotification::Signal() { 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(IsValid()); 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) char signal = 1; 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t bytes = socket_.Send(&signal, sizeof(signal)); 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(bytes, 1U) << "errno: " << errno; 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void CrossProcessNotification::Wait() { 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(IsValid()); 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) char signal = 0; 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t bytes = socket_.Receive(&signal, sizeof(signal)); 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(bytes, 1U) << "errno: " << errno; 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(signal, 1); 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool CrossProcessNotification::IsValid() const { 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return socket_.handle() != SocketClass::kInvalidHandle; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool CrossProcessNotification::ShareToProcess(base::ProcessHandle process, 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) IPCHandle* handle_1, 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) IPCHandle* handle_2) { 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(IsValid()); 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) handle_1->fd = socket_.handle(); 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) handle_1->auto_close = false; 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) handle_2->fd = -1; 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool CrossProcessNotification::InitializePair(CrossProcessNotification* a, 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CrossProcessNotification* b) { 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!a->IsValid()); 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!b->IsValid()); 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ok = SocketClass::CreatePair(&a->socket_, &b->socket_); 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DLOG_IF(WARNING, !ok) << "failed to create socket: " << errno; 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!ok || a->IsValid()); 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!ok || b->IsValid()); 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ok; 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int CrossProcessNotification::WaitMultiple(const Notifications& notifications, 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t wait_offset) { 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LT(wait_offset, notifications.size()); 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < notifications.size(); ++i) { 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(notifications[i]->IsValid()); 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Below, we always check the |revents| of the first socket in the array 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // and return the index of that socket if set. This can cause sockets 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // that come later in the array to starve when the first sockets are 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // very busy. So to avoid the starving problem, we use the |wait_offset| 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // variable to split up the array so that the last socket to be signaled 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // becomes the last socket in the array and all the other sockets will have 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // priority the next time WaitMultiple is called. 83c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) scoped_ptr<struct pollfd[]> sockets(new struct pollfd[notifications.size()]); 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&sockets[0], 0, notifications.size() * sizeof(sockets[0])); 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t index = 0; 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = wait_offset; i < notifications.size(); ++i) { 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) struct pollfd& fd = sockets[index++]; 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) fd.events = POLLIN; 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) fd.fd = notifications[i]->socket_.handle(); 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < wait_offset; ++i) { 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) struct pollfd& fd = sockets[index++]; 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) fd.events = POLLIN; 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) fd.fd = notifications[i]->socket_.handle(); 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(index, notifications.size()); 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int err = poll(&sockets[0], notifications.size(), -1); 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (err != -1) { 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < notifications.size(); ++i) { 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (sockets[i].revents) { 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t ret = (i + wait_offset) % notifications.size(); 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(sockets[i].fd, notifications[ret]->socket_.handle()); 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) notifications[ret]->Wait(); 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ret; 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Either poll() failed or we failed to find a single socket that was 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // signaled. Either way continuing will result in undefined behavior. 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LOG(FATAL) << "poll() failed: " << errno; 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return -1; 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 115