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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
135 lines
3.8 KiB
C
135 lines
3.8 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 "my_static.h"
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#include <m_string.h>
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/*
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set how many open files we want to be able to handle
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SYNOPSIS
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set_maximum_open_files()
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max_file_limit Files to open
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NOTES
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The request may not fulfilled becasue of system limitations
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RETURN
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Files available to open.
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May be more or less than max_file_limit!
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*/
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#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
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#ifndef RLIM_INFINITY
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#define RLIM_INFINITY ((uint) 0xffffffff)
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#endif
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static uint set_max_open_files(uint max_file_limit)
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{
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struct rlimit rlimit;
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uint old_cur;
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DBUG_ENTER("set_max_open_files");
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DBUG_PRINT("enter",("files: %u", max_file_limit));
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if (!getrlimit(RLIMIT_NOFILE,&rlimit))
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{
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old_cur= (uint) rlimit.rlim_cur;
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DBUG_PRINT("info", ("rlim_cur: %u rlim_max: %u",
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(uint) rlimit.rlim_cur,
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(uint) rlimit.rlim_max));
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if ((ulonglong) rlimit.rlim_cur == (ulonglong) RLIM_INFINITY)
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rlimit.rlim_cur = max_file_limit;
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if (rlimit.rlim_cur >= max_file_limit)
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DBUG_RETURN(rlimit.rlim_cur); /* purecov: inspected */
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rlimit.rlim_cur= rlimit.rlim_max= max_file_limit;
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if (setrlimit(RLIMIT_NOFILE, &rlimit))
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max_file_limit= old_cur; /* Use original value */
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else
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{
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rlimit.rlim_cur= 0; /* Safety if next call fails */
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(void) getrlimit(RLIMIT_NOFILE,&rlimit);
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DBUG_PRINT("info", ("rlim_cur: %u", (uint) rlimit.rlim_cur));
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if (rlimit.rlim_cur) /* If call didn't fail */
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max_file_limit= (uint) rlimit.rlim_cur;
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}
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}
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DBUG_PRINT("exit",("max_file_limit: %u", max_file_limit));
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DBUG_RETURN(max_file_limit);
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}
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#else
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static uint set_max_open_files(uint max_file_limit)
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{
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/* We don't know the limit. Return best guess */
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return min(max_file_limit, OS_FILE_LIMIT);
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}
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#endif
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/*
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Change number of open files
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SYNOPSIS:
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my_set_max_open_files()
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files Number of requested files
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RETURN
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number of files available for open
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*/
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uint my_set_max_open_files(uint files)
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{
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struct st_my_file_info *tmp;
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DBUG_ENTER("my_set_max_open_files");
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DBUG_PRINT("enter",("files: %u my_file_limit: %u", files, my_file_limit));
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files+= MY_FILE_MIN;
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files= set_max_open_files(min(files, OS_FILE_LIMIT));
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if (files <= MY_NFILE)
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DBUG_RETURN(files);
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if (!(tmp= (struct st_my_file_info*) my_malloc(sizeof(*tmp) * files,
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MYF(MY_WME))))
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DBUG_RETURN(MY_NFILE);
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/* Copy any initialized files */
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memcpy((char*) tmp, (char*) my_file_info,
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sizeof(*tmp) * min(my_file_limit, files));
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bzero((char*) (tmp + my_file_limit),
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max((int) (files- my_file_limit), 0)*sizeof(*tmp));
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my_free_open_file_info(); /* Free if already allocated */
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my_file_info= tmp;
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my_file_limit= files;
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DBUG_PRINT("exit",("files: %u", files));
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DBUG_RETURN(files);
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}
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void my_free_open_file_info()
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{
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DBUG_ENTER("my_free_file_info");
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if (my_file_info != my_file_info_default)
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{
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/* Copy data back for my_print_open_files */
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memcpy((char*) my_file_info_default, my_file_info,
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sizeof(*my_file_info_default)* MY_NFILE);
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my_free((char*) my_file_info, MYF(0));
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my_file_info= my_file_info_default;
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my_file_limit= MY_NFILE;
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}
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DBUG_VOID_RETURN;
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}
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