![]() ![]() #Hey guys get icursor code#(1) either the current thread is the first to reach this code & may proceed ![]() If the attempt is successful, there are two possibilities: If the isInit flag is false, the code attempts to create a mutex whose name is unique to that process. The existence (or non-existence) of a given named mutex is itself a semaphore. Since the logic that protects the creation of the static mutexes may not be self-evident, here's an explanation: #Hey guys get icursor Patch#The attached patch remedies all of these issues. There's another flaw that is fairly minor compared with the above: in an attempt to avoid concurrency when creating the static mutexes, this function uses an API call that is thoroughly deprecated. Every process ends up using the exact same SQLITE_MUTEX_STATIC_MASTER, SQLITE_MUTEX_STATIC_MEM, etc. Much the same is true for the static mutexes. Once this mutex is owned by one process, other processes calling sqlite3_mutex_enter() will be blocked. The result is that every call returns the exact same semaphore to every thread in every process using sqlite3. This might be minimally acceptable except that the function reuses the same name every time it attempts to create a SQLITE_MUTEX_FAST or SQLITE_MUTEX_RECURSIVE. ![]() It creates named mutexes which, by design, are global rather than process-specific as intended. The OS/2 version of sqlite3_mutex_alloc() is badly broken. Mutex_os2.c - incorrect mutex implementation I am attaching a test program that demonstrates the problem. For added confusion, sqlite3_errmsg() says "database is locked" when the ATTACH is done via sqlite3_exec(), but "SQL logic error or missing database" when the ATTACH is done via sqlite3_step().Īs a result of this bug, it is difficult to distinguish between fatal and transient ATTACH errors, particularly when sqlite3_step() is used. ATTACH DATABASE fails with SQLITE_ERROR rather than SQLITE_BUSY when the database to be attached, or the main database of the connection being attached to, is EXCLUSIVE-locked by another database connection. I'm seeing the same behavior as in #2096, with SQLite 3.5.4. tests.ĪTTACH returns SQLITE_ERROR when it means SQLITE_BUSY There are some targets that need a $(TEXE) added in Makefile.in. That's not only about large data sets - you can also make it for some sort of horizontal ATTACH of small separate pieces.įix Makefile for platforms that need. Well it would be great for us - won't need to emulate it. I see it currently in MySQL Version 5.1 beta. I would love to see a feature in the next version of sqlite that includes horizontal table partitioning. #Hey guys get icursor download#Sqlitedll-3_5_5.zip in download section is same with old 3.5.4 binary. Sqlitedll-3_5_5.zip is older 3.5.4 binary "db eval "select count(*) from incoming"" % db eval "select count(*) from incoming"īad option "0": must be -code, -errorcode, or -errorinfo In the Tcl interface the "busy" method doesn't work if a script is supplied instead of a procedure: Tcl interface - busy callback confusion script/procedure ![]()
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