1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "LibAAH_RTP" 18 #include <utils/Log.h> 19 20 #include <errno.h> 21 #include <fcntl.h> 22 #include <poll.h> 23 #include <unistd.h> 24 25 #include "pipe_event.h" 26 27 namespace android { 28 29 PipeEvent::PipeEvent() { 30 pipe_[0] = -1; 31 pipe_[1] = -1; 32 33 // Create the pipe. 34 if (pipe(pipe_) >= 0) { 35 // Set non-blocking mode on the read side of the pipe so we can 36 // easily drain it whenever we wakeup. 37 fcntl(pipe_[0], F_SETFL, O_NONBLOCK); 38 } else { 39 ALOGE("Failed to create pipe event %d %d %d", 40 pipe_[0], pipe_[1], errno); 41 pipe_[0] = -1; 42 pipe_[1] = -1; 43 } 44 } 45 46 PipeEvent::~PipeEvent() { 47 if (pipe_[0] >= 0) { 48 close(pipe_[0]); 49 } 50 51 if (pipe_[1] >= 0) { 52 close(pipe_[1]); 53 } 54 } 55 56 void PipeEvent::clearPendingEvents() { 57 char drain_buffer[16]; 58 while (read(pipe_[0], drain_buffer, sizeof(drain_buffer)) > 0) { 59 // No body. 60 } 61 } 62 63 bool PipeEvent::wait(int timeout) { 64 struct pollfd wait_fd; 65 66 wait_fd.fd = getWakeupHandle(); 67 wait_fd.events = POLLIN; 68 wait_fd.revents = 0; 69 70 int res = poll(&wait_fd, 1, timeout); 71 72 if (res < 0) { 73 ALOGE("Wait error in PipeEvent; sleeping to prevent overload!"); 74 usleep(1000); 75 } 76 77 return (res > 0); 78 } 79 80 void PipeEvent::setEvent() { 81 char foo = 'q'; 82 write(pipe_[1], &foo, 1); 83 } 84 85 } // namespace android 86 87
