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4171483b53
The patch replaces the use of the POSIX I/O interfaces in mysys on Windows with the Win32 API calls (CreateFile, WriteFile, etc). The Windows HANDLE for the open file is stored in the my_file_info struct, along with a flag for append mode (because the Windows API does not support opening files in append mode in all cases) The default max open files has been increased to 16384 and can be increased further by setting --max-open-files=<value> during the server start. Noteworthy benefit of this patch is that it removes limits from the table_cache size - allowing for more simultaneus users
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* Quicker interface to read & write. Used with my_nosys.h */
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#include "mysys_priv.h"
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#include "my_nosys.h"
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#ifdef _WIN32
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extern size_t my_win_read(File Filedes,uchar *Buffer,size_t Count);
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#endif
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size_t my_quick_read(File Filedes,uchar *Buffer,size_t Count,myf MyFlags)
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{
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size_t readbytes;
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#ifdef _WIN32
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readbytes= my_win_read(Filedes, Buffer, Count);
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#else
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readbytes= read(Filedes, Buffer, Count);
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#endif
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if(readbytes != Count)
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{
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#ifndef DBUG_OFF
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if ((readbytes == 0 || readbytes == (size_t) -1) && errno == EINTR)
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{
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DBUG_PRINT("error", ("my_quick_read() was interrupted and returned %d"
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". This function does not retry the read!",
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(int) readbytes));
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}
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#endif
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my_errno=errno;
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return readbytes;
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}
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return (MyFlags & (MY_NABP | MY_FNABP)) ? 0 : readbytes;
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}
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size_t my_quick_write(File Filedes, const uchar *Buffer, size_t Count)
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{
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#ifdef _WIN32
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return my_win_write(Filedes, Buffer, Count);
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#else
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#ifndef DBUG_OFF
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size_t writtenbytes;
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#endif
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if ((
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#ifndef DBUG_OFF
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writtenbytes =
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#endif
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(size_t) write(Filedes,Buffer,Count)) != Count)
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{
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#ifndef DBUG_OFF
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if ((writtenbytes == 0 || writtenbytes == (size_t) -1) && errno == EINTR)
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{
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DBUG_PRINT("error", ("my_quick_write() was interrupted and returned %d"
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". This function does not retry the write!",
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(int) writtenbytes));
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}
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#endif
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my_errno=errno;
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return (size_t) -1;
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}
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return 0;
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#endif
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}
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