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This was SVN commit r11.
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// POSIX asynchronous I/O
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//
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// Copyright (c) 2003 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// Contact info:
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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#include <cassert>
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#include <cstdlib>
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#include "posix.h"
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#include "win.h"
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#include "misc.h"
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#include "types.h"
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// Win32 functions require sector aligned transfers.
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// updated by aio_open; changes don't affect aio_return
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static u32 sector_size = 4096;
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// async-capable handles to each lowio file
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static HANDLE* aio_hs;
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static uint hs_cap;
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// information about active transfers (reused)
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struct Req
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{
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// used to identify this request; != 0 <==> request valid
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aiocb* cb;
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OVERLAPPED ovl;
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// hEvent signals when transfer complete
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// read into a separate align buffer if necessary
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// (note: unaligned writes aren't supported. see aio_rw)
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u32 pad; // offset from starting sector
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void* buf; // reused; resize if too small
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u32 buf_size;
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};
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static const int MAX_REQS = 4;
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static Req reqs[MAX_REQS];
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static HANDLE open_mutex, reqs_mutex;
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#define LOCK(what) WaitForSingleObject(what##_mutex, INFINITE);
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#define UNLOCK(what) ReleaseMutex(what##_mutex);
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// get async capable handle to file <fd>
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// current implementation: open both versions of the file on open()
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// wastes 1 handle/file, but we don't have to remember the filename/mode
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static HANDLE aio_h(int fd)
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{
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if((unsigned)fd >= hs_cap)
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return INVALID_HANDLE_VALUE;
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return aio_hs[fd];
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}
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// find request slot currently in use by cb
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// cb = 0 => search for empty slot
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static Req* find_req(const aiocb* cb)
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{
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Req* r = reqs;
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for(int i = 0; i < MAX_REQS; i++, r++)
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if(r->cb == cb)
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return r;
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return 0;
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}
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static void cleanup(void)
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{
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uint i;
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// close files
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for(i = 0; i < hs_cap; i++)
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{
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HANDLE h = aio_h(i);
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if(h != INVALID_HANDLE_VALUE)
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CloseHandle(h);
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}
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free(aio_hs);
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aio_hs = 0;
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hs_cap = 0;
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// free requests
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Req* r = reqs;
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for(i = 0; i < MAX_REQS; i++, r++)
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{
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r->cb = 0;
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CloseHandle(r->ovl.hEvent);
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r->ovl.hEvent = INVALID_HANDLE_VALUE;
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free(r->buf);
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r->buf = 0;
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}
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CloseHandle(open_mutex);
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CloseHandle(reqs_mutex);
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}
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// called by first aio_open
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static void init()
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{
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for(int i = 0; i < MAX_REQS; i++)
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reqs[i].ovl.hEvent = CreateEvent(0,1,0,0); // manual reset
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open_mutex = CreateMutex(0,0,0);
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reqs_mutex = CreateMutex(0,0,0);
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atexit(cleanup);
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}
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int aio_close(int fd)
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{
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HANDLE h = aio_h(fd);
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if(h == INVALID_HANDLE_VALUE) // out of bounds or already closed
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return -1;
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CloseHandle(h);
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aio_hs[fd] = INVALID_HANDLE_VALUE;
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return 0;
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}
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// open fn in async mode; associate with fd (retrieve via aio_h(fd))
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int aio_open(const char* fn, int mode, int fd)
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{
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LOCK(open)
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ONCE(init())
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// alloc aio_hs entry
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if((unsigned)fd >= hs_cap)
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{
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uint hs_cap2 = fd+4;
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HANDLE* aio_hs2 = (HANDLE*)realloc(aio_hs, hs_cap2*sizeof(HANDLE));
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if(!aio_hs2)
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{
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UNLOCK(open)
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return -1;
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}
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for(uint i = hs_cap; i < hs_cap2; i++)
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aio_hs2[i] = INVALID_HANDLE_VALUE;
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aio_hs = aio_hs2;
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hs_cap = hs_cap2;
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}
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UNLOCK(open)
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// interpret mode
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u32 access = GENERIC_READ; // assume O_RDONLY
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u32 share = 0;
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if(mode & O_WRONLY)
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access = GENERIC_WRITE;
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else if(mode & O_RDWR)
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access = GENERIC_READ|GENERIC_WRITE;
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else
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share = FILE_SHARE_READ;
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u32 create = OPEN_EXISTING;
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if(mode & O_CREAT)
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create = (mode & O_EXCL)? CREATE_NEW : CREATE_ALWAYS;
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u32 flags = FILE_FLAG_OVERLAPPED|FILE_FLAG_NO_BUFFERING|FILE_FLAG_SEQUENTIAL_SCAN;
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// open file, store in aio_hs array
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aio_hs[fd] = CreateFile(fn, access, share, 0, create, flags, 0);
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if(aio_hs[fd] == INVALID_HANDLE_VALUE)
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return -1;
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// check drive's sector size (Win32 requires alignment)
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char path[PATH_MAX];
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realpath(fn, path);
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path[3] = 0; // cut off after ?:\\
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u32 spc, nfc, tnc; // don't need these
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u32 sector_size2;
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GetDiskFreeSpace(path, &spc, §or_size2, &nfc, &tnc);
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LOCK(open)
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if(sector_size < sector_size2)
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sector_size = sector_size2;
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UNLOCK(open)
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return 0;
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}
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// called by aio_read, aio_write, and lio_listio
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// cb->aio_lio_opcode specifies desired operation
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static int aio_rw(struct aiocb* cb)
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{
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if(!cb)
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return -1;
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if(cb->aio_lio_opcode == LIO_NOP)
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return 0;
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HANDLE h = aio_h(cb->aio_fildes);
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if(h == INVALID_HANDLE_VALUE)
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return -1;
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LOCK(reqs)
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// find free request slot
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Req* r = find_req(0);
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if(!r)
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{
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UNLOCK(reqs)
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return -1;
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}
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r->cb = cb;
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UNLOCK(reqs)
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// align
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r->pad = cb->aio_offset % sector_size; // offset to start of sector
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const u32 ofs = cb->aio_offset - r->pad;
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const u32 size = round_up((long)cb->aio_nbytes+r->pad, sector_size);
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void* buf = cb->aio_buf;
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if(r->pad || (long)buf % sector_size)
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{
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// current align buffer is too small - resize
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if(r->buf_size < size)
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{
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void* buf2 = realloc(r->buf, size);
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if(!buf2)
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return -1;
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r->buf = buf2;
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r->buf_size = size;
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}
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// unaligned writes are not supported -
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// we'd have to read padding, then write our data. ugh.
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if(cb->aio_lio_opcode == LIO_WRITE)
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return -1;
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buf = r->buf;
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}
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r->ovl.Offset = ofs;
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u32 status = (cb->aio_lio_opcode == LIO_READ)?
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ReadFile(h, buf, size, 0, &r->ovl) : WriteFile(h, buf, size, 0, &r->ovl);
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if(status || GetLastError() == ERROR_IO_PENDING)
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return 0;
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return -1;
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}
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int aio_read(struct aiocb* cb)
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{
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cb->aio_lio_opcode = LIO_READ;
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return aio_rw(cb);
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}
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int aio_write(struct aiocb* cb)
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{
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cb->aio_lio_opcode = LIO_WRITE;
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return aio_rw(cb);
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}
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int lio_listio(int mode, struct aiocb* const cbs[], int n, struct sigevent* se)
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{
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UNUSED(se)
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for(int i = 0; i < n; i++)
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aio_rw(cbs[i]); // aio_rw checks for 0 param
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if(mode == LIO_WAIT)
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aio_suspend(cbs, n, 0);
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return 0;
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}
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// return status of transfer
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int aio_error(const struct aiocb* cb)
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{
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Req* const r = find_req(cb);
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if(!r)
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return -1;
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switch(r->ovl.Internal) // I/O status
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{
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case 0:
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return 0;
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case STATUS_PENDING:
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return -EINPROGRESS;
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// TODO: errors
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default:
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return -1;
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}
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}
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// get bytes transferred. call exactly once for each op.
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ssize_t aio_return(struct aiocb* cb)
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{
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Req* const r = find_req(cb);
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if(!r)
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return -1;
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assert(r->ovl.Internal == 0 && "aio_return with transfer in progress");
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// read wasn't aligned - need to copy to user's buffer
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if(r->pad || (long)cb->aio_buf % sector_size)
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memcpy(cb->aio_buf, (u8*)r->buf + r->pad, cb->aio_nbytes);
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// free this request slot
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r->cb = 0;
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return (ssize_t)cb->aio_nbytes;
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}
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int aio_cancel(int fd, struct aiocb* cb)
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{
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UNUSED(cb)
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const HANDLE h = aio_h(fd);
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if(h == INVALID_HANDLE_VALUE)
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return -1;
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// Win32 limitation: can't cancel single transfers
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CancelIo(h);
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return AIO_CANCELED;
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}
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int aio_fsync(int, struct aiocb*)
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{
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return -1;
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}
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int aio_suspend(const struct aiocb* const cbs[], int n, const struct timespec* ts)
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{
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int cnt = 0; // actual number of valid cbs
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HANDLE* hs = (HANDLE*)malloc(n*sizeof(HANDLE));
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if(!hs)
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return -1;
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for(int i = 0; i < n; i++)
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{
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// ignore NULL list entries
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if(!cbs[i])
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continue;
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Req* r = find_req(cbs[i]);
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if(r)
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hs[cnt++] = r->ovl.hEvent;
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}
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// timeout: convert timespec to ms (NULL ptr -> no timeout)
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u32 timeout = INFINITE;
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if(ts)
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timeout = ts->tv_sec*1000 + ts->tv_nsec/1000000;
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u32 status = WaitForMultipleObjects(cnt, hs, 0, timeout);
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free(hs);
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if(status == WAIT_TIMEOUT)
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{
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//errno = -EAGAIN;
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return -1;
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}
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else if(status == WAIT_FAILED)
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return -1;
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return 0;
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}
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@ -1,63 +0,0 @@
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// POSIX asynchronous I/O
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//
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// Copyright (c) 2003 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// Contact info:
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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// included by posix.h
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// Note: for maximum efficiency, transfer buffers, offsets, and lengths
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// should be sector aligned (otherwise, buffer is copied).
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struct aiocb
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{
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int aio_fildes; // File descriptor.
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off_t aio_offset; // File offset.
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void* aio_buf; // Location of buffer.
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size_t aio_nbytes; // Length of transfer.
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int aio_reqprio; // Request priority offset.
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struct sigevent aio_sigevent; // Signal number and value.
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int aio_lio_opcode; // Operation to be performed.
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};
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enum
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{
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// aio_cancel return
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AIO_ALLDONE, // None of the requested operations could be canceled since they are already complete.
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AIO_CANCELED, // All requested operations have been canceled.
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AIO_NOTCANCELED, // Some of the requested operations could not be canceled since they are in progress.
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// lio_listio mode
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LIO_WAIT, // wait until all I/O is complete
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LIO_NOWAIT,
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// lio_listio ops
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LIO_NOP,
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LIO_READ,
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LIO_WRITE
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};
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extern int aio_cancel(int, struct aiocb*);
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extern int aio_error(const struct aiocb*);
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extern int aio_fsync(int, struct aiocb*);
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extern int aio_read(struct aiocb*);
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extern ssize_t aio_return(struct aiocb*);
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extern int aio_suspend(const struct aiocb* const[], int, const struct timespec*);
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extern int aio_write(struct aiocb*);
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extern int lio_listio(int, struct aiocb* const[], int, struct sigevent*);
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extern int aio_close(int fd);
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extern int aio_open(const char* fn, int mode, int fd);
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