mariadb

Tree: 2b39e065d7

Author	SHA1	Message	Date
Davi Arnaut	a10ae35328	Bug#34043: Server loops excessively in _checkchunk() when safemalloc is enabled Essentially, the problem is that safemalloc is excruciatingly slow as it checks all allocated blocks for overrun at each memory management primitive, yielding a almost exponential slowdown for the memory management functions (malloc, realloc, free). The overrun check basically consists of verifying some bytes of a block for certain magic keys, which catches some simple forms of overrun. Another minor problem is violation of aliasing rules and that its own internal list of blocks is prone to corruption. Another issue with safemalloc is rather the maintenance cost as the tool has a significant impact on the server code. Given the magnitude of memory debuggers available nowadays, especially those that are provided with the platform malloc implementation, maintenance of a in-house and largely obsolete memory debugger becomes a burden that is not worth the effort due to its slowness and lack of support for detecting more common forms of heap corruption. Since there are third-party tools that can provide the same functionality at a lower or comparable performance cost, the solution is to simply remove safemalloc. Third-party tools can provide the same functionality at a lower or comparable performance cost. The removal of safemalloc also allows a simplification of the malloc wrappers, removing quite a bit of kludge: redefinition of my_malloc, my_free and the removal of the unused second argument of my_free. Since free() always check whether the supplied pointer is null, redudant checks are also removed. Also, this patch adds unit testing for my_malloc and moves my_realloc implementation into the same file as the other memory allocation primitives.	16 years ago
Vladislav Vaintroub	4e92af9f43	This is the downport of Bug#24509 - 2048 file descriptor limit on windows needs increasing, also WL#3049 - improved Windows I/O 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. Another major change in this patch that almost all Windows specific file IO code has been moved to a new file my_winfile.c, greatly reducing the amount of code in #ifdef blocks within mysys, thus improving readability. Minor enhancements: - my_(f)stat() is changed to use __stati64 structure with 64 file size and timestamps. It will return correct file size now (C runtime implementation used to report outdated information) - my_lock on Windows is prepared to handle additional timeout parameter - after review : changed __WIN__ to _WIN32 in the new and changed code.	16 years ago
Alexey Kopytov	a3e5737abd	Fix for bug#41486: extra character appears in BLOB for every ~40Mb after mysqldump/import When the input string exceeds the maximum allowed size for the internal buffer, batch_readline() returns a truncated string. Since there was no way for a caller to determine whether the string was truncated or not, the command line client assumed batch_readline() to always return the whole input string and appended a newline character. This resulted in garbled data when importing dumps containing strings longer than the maximum input buffer size. Fixed by adding a flag to the batch_readline() interface to signal a truncated string to the caller. Other minor problems fixed during patch implementation: - The maximum allowed buffer size for batch_readline() was set up depending on the client's max_allowed_packet value. It does not actully make any sense, as those variables are not related. The input buffer size limit is now always set to 1 MB. - fill_buffer() did not always set the EOF flag. - The input buffer could actually grow twice as the specified limit due to insufficient checks in intern_read_line().	17 years ago
monty@mysql.com/narttu.mysql.fi	088e2395f1	WL#3817: Simplify string / memory area types and make things more consistent (first part) The following type conversions was done: - Changed byte to uchar - Changed gptr to uchar* - Change my_string to char * - Change my_size_t to size_t - Change size_s to size_t Removed declaration of byte, gptr, my_string, my_size_t and size_s. Following function parameter changes was done: - All string functions in mysys/strings was changed to use size_t instead of uint for string lengths. - All read()/write() functions changed to use size_t (including vio). - All protocoll functions changed to use size_t instead of uint - Functions that used a pointer to a string length was changed to use size_t* - Changed malloc(), free() and related functions from using gptr to use void * as this requires fewer casts in the code and is more in line with how the standard functions work. - Added extra length argument to dirname_part() to return the length of the created string. - Changed (at least) following functions to take uchar* as argument: - db_dump() - my_net_write() - net_write_command() - net_store_data() - DBUG_DUMP() - decimal2bin() & bin2decimal() - Changed my_compress() and my_uncompress() to use size_t. Changed one argument to my_uncompress() from a pointer to a value as we only return one value (makes function easier to use). - Changed type of 'pack_data' argument to packfrm() to avoid casts. - Changed in readfrm() and writefrom(), ha_discover and handler::discover() the type for argument 'frmdata' to uchar** to avoid casts. - Changed most Field functions to use uchar* instead of char* (reduced a lot of casts). - Changed field->val_xxx(xxx, new_ptr) to take const pointers. Other changes: - Removed a lot of not needed casts - Added a few new cast required by other changes - Added some cast to my_multi_malloc() arguments for safety (as string lengths needs to be uint, not size_t). - Fixed all calls to hash-get-key functions to use size_t. (Needed to be done explicitely as this conflict was often hided by casting the function to hash_get_key). - Changed some buffers to memory regions to uchar to avoid casts. - Changed some string lengths from uint to size_t. - Changed field->ptr to be uchar* instead of char*. This allowed us to get rid of a lot of casts. - Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar - Include zlib.h in some files as we needed declaration of crc32() - Changed MY_FILE_ERROR to be (size_t) -1. - Changed many variables to hold the result of my_read() / my_write() to be size_t. This was needed to properly detect errors (which are returned as (size_t) -1). - Removed some very old VMS code - Changed packfrm()/unpackfrm() to not be depending on uint size (portability fix) - Removed windows specific code to restore cursor position as this causes slowdown on windows and we should not mix read() and pread() calls anyway as this is not thread safe. Updated function comment to reflect this. Changed function that depended on original behavior of my_pwrite() to itself restore the cursor position (one such case). - Added some missing checking of return value of malloc(). - Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow. - Changed type of table_def::m_size from my_size_t to ulong to reflect that m_size is the number of elements in the array, not a string/memory length. - Moved THD::max_row_length() to table.cc (as it's not depending on THD). Inlined max_row_length_blob() into this function. - More function comments - Fixed some compiler warnings when compiled without partitions. - Removed setting of LEX_STRING() arguments in declaration (portability fix). - Some trivial indentation/variable name changes. - Some trivial code simplifications: - Replaced some calls to alloc_root + memcpy to use strmake_root()/strdup_root(). - Changed some calls from memdup() to strmake() (Safety fix) - Simpler loops in client-simple.c	19 years ago
kent@mysql.com/kent-amd64.(none)	226a5c833f	Many files: Changed header to GPL version 2 only	19 years ago
iggy@rolltop.ignatz42.dyndns.org	bface97ecc	Bug#19799 delimiter command not working correctly when sourcing a sql file - Client side readline functions unconditionally search for Unix '\n' line endings. In this case, the delimiter statement was set to '//\r' instead of the intended '//'. When removing the '\n' check for and remove preceeding '\r' character as well.	19 years ago
georg@lmy002.wdf.sap.corp	877b2f4688	fixed conversion errors (Windows IA64 build)	21 years ago
serg@serg.mylan	803279f0c7	mysql.cc: allow several -e on the command line clarify --help text make -B to work as advertised in force mode execute the rest of multi-statement line in case of error in one statement	22 years ago
monty@hundin.mysql.fi	4b877e0088	Added macros for nice TIMESPEC usage. Fixes for building MySQL with gcc 3.0 Added SIGNED / UNSIGNED casts Fixed core dump bug in net_clear() with libmysqld. Back to using semaphores in query cache. Added 'Null' and 'Index_type' to SHOW INDEX.	24 years ago
monty@hundin.mysql.fi	b658662ae4	Update copyright Fixed memory leak on shutdown (Affects the embedded version & MyODBC)	24 years ago
monty@hundin.mysql.fi	7cadc6e711	Changed to use my_global.h Fixed problem with LIKE with latin1_de Added parsing support of UNSIGNED LONG LONG	25 years ago
monty@donna.mysql.com	60677ffd2c	Cleanup of tests Fixed bug with ALTER TABLE on HEAP tables	25 years ago
monty@donna.mysql.com	f0952ce3e1	FLUSH TABLE table_list Fixes for RENAME TABLE Portability fixes	26 years ago
bk@work.mysql.com	f4c589ff6c	Import changeset	26 years ago

15 Commits (2b39e065d70078daa097a811c939003a071dcb70)