elexis
43137fef3f
Differential Revision: https://code.wildfiregames.com/D716
Refs 09e974e1cb
Reviewed By: bb
Change in agreement with leper.
This was SVN commit r19899.
103 lines
2.9 KiB
C++
103 lines
2.9 KiB
C++
/* Copyright (C) 2011 Wildfire Games.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "precompiled.h"
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#include "lib/file/io/io.h"
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#include "lib/sysdep/rtl.h"
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static const StatusDefinition ioStatusDefinitions[] = {
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{ ERR::IO, L"Error during IO", EIO }
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};
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STATUS_ADD_DEFINITIONS(ioStatusDefinitions);
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namespace io {
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// this is just a thin wrapper on top of lowio and POSIX aio.
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// note that the Windows aio implementation requires buffers, sizes and
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// offsets to be sector-aligned.
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Status Issue(aiocb& cb, size_t queueDepth)
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{
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#if CONFIG2_FILE_ENABLE_AIO
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if(queueDepth > 1)
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{
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const int ret = (cb.aio_lio_opcode == LIO_WRITE)? aio_write(&cb): aio_read(&cb);
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if(ret != 0)
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WARN_RETURN(StatusFromErrno());
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}
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else
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#else
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UNUSED2(queueDepth);
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#endif
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{
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ENSURE(lseek(cb.aio_fildes, cb.aio_offset, SEEK_SET) == cb.aio_offset);
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void* buf = (void*)cb.aio_buf; // cast from volatile void*
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const ssize_t bytesTransferred = (cb.aio_lio_opcode == LIO_WRITE)? write(cb.aio_fildes, buf, cb.aio_nbytes) : read(cb.aio_fildes, buf, cb.aio_nbytes);
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if(bytesTransferred < 0)
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WARN_RETURN(StatusFromErrno());
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cb.aio_nbytes = (size_t)bytesTransferred;
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}
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return INFO::OK;
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}
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Status WaitUntilComplete(aiocb& cb, size_t queueDepth)
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{
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#if CONFIG2_FILE_ENABLE_AIO
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if(queueDepth > 1)
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{
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aiocb* const cbs = &cb;
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timespec* const timeout = 0; // infinite
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SUSPEND_AGAIN:
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errno = 0;
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const int ret = aio_suspend(&cbs, 1, timeout);
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if(ret != 0)
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{
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if(errno == EINTR) // interrupted by signal
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goto SUSPEND_AGAIN;
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WARN_RETURN(StatusFromErrno());
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}
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const int err = aio_error(&cb);
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ENSURE(err != EINPROGRESS); // else aio_return is undefined
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ssize_t bytesTransferred = aio_return(&cb);
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if(bytesTransferred == -1) // transfer failed
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{
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errno = err;
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WARN_RETURN(StatusFromErrno());
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}
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cb.aio_nbytes = (size_t)bytesTransferred;
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}
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#else
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UNUSED2(cb);
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UNUSED2(queueDepth);
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#endif
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return INFO::OK;
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}
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} // namespace io
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