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84 lines
2.4 KiB
84 lines
2.4 KiB
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _ASYNCIO_H
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#define _ASYNCIO_H
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#include <fcntl.h>
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#include <linux/aio_abi.h>
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#include <memory>
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#include <signal.h>
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <time.h>
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#include <thread>
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#include <unistd.h>
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/**
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* Provides a subset of POSIX aio operations, as well
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* as similar operations with splice and threadpools.
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*/
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struct aiocb {
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int aio_fildes; // Assumed to be the source for splices
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void *aio_buf; // Unused for splices
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// Used for threadpool operations only, freed automatically
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std::unique_ptr<char[]> aio_pool_buf;
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off_t aio_offset;
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size_t aio_nbytes;
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int aio_sink; // Unused for non splice r/w
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// Used internally
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std::thread thread;
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ssize_t ret;
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int error;
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~aiocb();
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};
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// Submit a request for IO to be completed
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int aio_read(struct aiocb *);
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int aio_write(struct aiocb *);
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int aio_splice_read(struct aiocb *);
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int aio_splice_write(struct aiocb *);
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// Suspend current thread until given IO is complete, at which point
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// its return value and any errors can be accessed
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// All submitted requests must have a corresponding suspend.
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// aiocb->aio_buf must refer to valid memory until after the suspend call
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int aio_suspend(struct aiocb *[], int, const struct timespec *);
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int aio_error(const struct aiocb *);
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ssize_t aio_return(struct aiocb *);
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// (Currently unimplemented)
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int aio_cancel(int, struct aiocb *);
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// Initialize a threadpool to perform IO. Only one pool can be
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// running at a time.
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void aio_pool_write_init();
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void aio_pool_splice_init();
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// Suspend current thread until all queued work is complete, then ends the threadpool
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void aio_pool_end();
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// Submit IO work for the threadpool to complete. Memory associated with the work is
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// freed automatically when the work is complete.
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int aio_pool_write(struct aiocb *);
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#endif // ASYNCIO_H
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