1 /* 2 * Copyright (C) 2016 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 #include <android-base/logging.h> 18 #include <condition_variable> 19 #include <memory> 20 #include <mutex> 21 #include <queue> 22 #include <unistd.h> 23 24 #include "PosixAsyncIO.h" 25 26 namespace { 27 28 void read_func(struct aiocb *aiocbp) { 29 aiocbp->ret = TEMP_FAILURE_RETRY(pread(aiocbp->aio_fildes, 30 aiocbp->aio_buf, aiocbp->aio_nbytes, aiocbp->aio_offset)); 31 if (aiocbp->ret == -1) aiocbp->error = errno; 32 } 33 34 void write_func(struct aiocb *aiocbp) { 35 aiocbp->ret = TEMP_FAILURE_RETRY(pwrite(aiocbp->aio_fildes, 36 aiocbp->aio_buf, aiocbp->aio_nbytes, aiocbp->aio_offset)); 37 if (aiocbp->ret == -1) aiocbp->error = errno; 38 } 39 40 } // end anonymous namespace 41 42 aiocb::~aiocb() { 43 CHECK(!thread.joinable()); 44 } 45 46 int aio_read(struct aiocb *aiocbp) { 47 aiocbp->thread = std::thread(read_func, aiocbp); 48 return 0; 49 } 50 51 int aio_write(struct aiocb *aiocbp) { 52 aiocbp->thread = std::thread(write_func, aiocbp); 53 return 0; 54 } 55 56 int aio_error(const struct aiocb *aiocbp) { 57 return aiocbp->error; 58 } 59 60 ssize_t aio_return(struct aiocb *aiocbp) { 61 return aiocbp->ret; 62 } 63 64 int aio_suspend(struct aiocb *aiocbp[], int n, 65 const struct timespec *) { 66 for (int i = 0; i < n; i++) { 67 aiocbp[i]->thread.join(); 68 } 69 return 0; 70 } 71 72 void aio_prepare(struct aiocb *aiocbp, void* buf, size_t count, off_t offset) { 73 aiocbp->aio_buf = buf; 74 aiocbp->aio_offset = offset; 75 aiocbp->aio_nbytes = count; 76 } 77
