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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
106 lines
3 KiB
C
106 lines
3 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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#include "mysys_priv.h"
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#include "mysys_err.h"
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#include <errno.h>
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/* Write a chunk of bytes to a file */
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size_t my_write(int Filedes, const uchar *Buffer, size_t Count, myf MyFlags)
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{
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size_t writtenbytes, written;
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uint errors;
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DBUG_ENTER("my_write");
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DBUG_PRINT("my",("fd: %d Buffer: 0x%lx Count: %lu MyFlags: %d",
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Filedes, (long) Buffer, (ulong) Count, MyFlags));
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errors=0; written=0;
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/* The behavior of write(fd, buf, 0) is not portable */
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if (unlikely(!Count))
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DBUG_RETURN(0);
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for (;;)
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{
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#ifdef _WIN32
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if(Filedes < 0)
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{
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errno = EINVAL;
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return -1;
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}
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writtenbytes= my_win_write(Filedes, Buffer, Count);
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#else
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writtenbytes= write(Filedes, Buffer, Count);
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#endif
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if (writtenbytes == Count)
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break;
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if (writtenbytes != (size_t) -1)
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{ /* Safeguard */
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written+= writtenbytes;
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Buffer+= writtenbytes;
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Count-= writtenbytes;
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}
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my_errno= errno;
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DBUG_PRINT("error",("Write only %ld bytes, error: %d",
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(long) writtenbytes, my_errno));
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#ifndef NO_BACKGROUND
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#ifdef THREAD
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if (my_thread_var->abort)
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MyFlags&= ~ MY_WAIT_IF_FULL; /* End if aborted by user */
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#endif
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if ((my_errno == ENOSPC || my_errno == EDQUOT) &&
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(MyFlags & MY_WAIT_IF_FULL))
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{
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wait_for_free_space(my_filename(Filedes), errors);
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errors++;
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continue;
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}
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if ((writtenbytes == 0 || writtenbytes == (size_t) -1))
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{
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if (my_errno == EINTR)
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{
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DBUG_PRINT("debug", ("my_write() was interrupted and returned %ld",
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(long) writtenbytes));
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continue; /* Interrupted */
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}
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if (!writtenbytes && !errors++) /* Retry once */
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{
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/* We may come here if the file quota is exeeded */
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errno= EFBIG; /* Assume this is the error */
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continue;
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}
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}
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else
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continue; /* Retry */
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#endif
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if (MyFlags & (MY_NABP | MY_FNABP))
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{
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if (MyFlags & (MY_WME | MY_FAE | MY_FNABP))
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{
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my_error(EE_WRITE, MYF(ME_BELL+ME_WAITTANG),
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my_filename(Filedes),my_errno);
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}
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DBUG_RETURN(MY_FILE_ERROR); /* Error on read */
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}
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else
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break; /* Return bytes written */
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}
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if (MyFlags & (MY_NABP | MY_FNABP))
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DBUG_RETURN(0); /* Want only errors */
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DBUG_RETURN(writtenbytes+written);
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} /* my_write */
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