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 #ifndef _POSIXASYNCIO_H 18 #define _POSIXASYNCIO_H 19 20 #include <sys/cdefs.h> 21 #include <sys/types.h> 22 #include <time.h> 23 #include <thread> 24 #include <unistd.h> 25 26 /** 27 * Provides a subset of POSIX aio operations. 28 */ 29 30 struct aiocb { 31 int aio_fildes; 32 void *aio_buf; 33 34 off_t aio_offset; 35 size_t aio_nbytes; 36 37 // Used internally 38 std::thread thread; 39 ssize_t ret; 40 int error; 41 42 ~aiocb(); 43 }; 44 45 // Submit a request for IO to be completed 46 int aio_read(struct aiocb *); 47 int aio_write(struct aiocb *); 48 49 // Suspend current thread until given IO is complete, at which point 50 // its return value and any errors can be accessed 51 // All submitted requests must have a corresponding suspend. 52 // aiocb->aio_buf must refer to valid memory until after the suspend call 53 int aio_suspend(struct aiocb *[], int, const struct timespec *); 54 int aio_error(const struct aiocb *); 55 ssize_t aio_return(struct aiocb *); 56 57 // Helper method for setting aiocb members 58 void aio_prepare(struct aiocb *, void*, size_t, off_t); 59 60 #endif // POSIXASYNCIO_H 61 62
