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optimize-null-values
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33 Commits

Author SHA1 Message Date
drh
c071c47b51 Tamp down various harmless compiler warnings. Use "int" in places instead 
of "u16" or "i16" since the compiler complains less and generates faster
code.

FossilOrigin-Name: 742827f049768c4f69ccdfaadfad339aaad3bc126d3a68b90cfea01d825bf7ce
 2025-02-22 16:44:14 +00:00
larrybr
bc91738e66 Add a C-source spell-checking facility. make misspell (on Nix) 
FossilOrigin-Name: 26c1bb4bd9e9f56613c3aa87407a7f562fd4ebde5bfd6dece02078001d9a45f8
 2023-06-07 08:40:31 +00:00
drh
41ce47c4f4 Add the new internal interface sqlite3DbNNFreeNN(db,ptr) where both the 
db and ptr parameters are guaranteed to be non-NULL.  Use this where
appropriate to save more than 2 million CPU cycles on the standard
performance test.

FossilOrigin-Name: e5eaa80e81fdf86f2875a912b880272b8d099b82b08e945a7988c5dd0fe9d6b5
 2022-08-22 02:00:26 +00:00
drh
b2c8559fad Avoid many unnecessary calls to sqlite3ReadSchema() and sqlite3Init() when 
the schema is known to be valid already.

FossilOrigin-Name: 58cf812fd81329e82b3fdd61b7ad2040c9b90d2d80f592b9231e0e1902c8d577
 2018-04-25 12:01:45 +00:00
drh
38eef32172 Avoid unnecessary calls to sqlite3BtreeEnterAll() and sqlite3BtreeLeaveAll() 
when no btree is using shared-cache.

FossilOrigin-Name: cfb3158204628eb2fd170090a7f212df0e4ce6c9
 2017-01-02 18:19:29 +00:00
dan
20d876fa1c Have the vdbe layer call sqlite3BtreeEnter() on all b-trees in use from within sqlite3VdbeExec() even in SQLITE_THREADSAFE=0 builds. This ensures that BtShared.db is set correctly. 
FossilOrigin-Name: d0214602d44d6b84b7463d530720e2560aee6edf
 2016-01-07 16:06:22 +00:00
dan
b77009fdd9 Add an assert() to check that the database mutex is held in sqlite3BtreeLeave(). 
FossilOrigin-Name: 31f54d7b0798e70da6a60b8ea3c5d9e35dce164c
 2015-03-19 15:04:23 +00:00
peter.d.reid
60ec914c74 Fix typos in comments. No code changes. 
FossilOrigin-Name: e62aab5e9290503869e1f4d5e0fefd2b4dee0a69
 2014-09-06 16:39:46 +00:00
drh
75e2a2d362 Performance enhancements in the b-tree mutex logic. 
FossilOrigin-Name: 8914530644f938a7a98e25ea1fb0bca1f9d79101
 2014-08-22 21:58:10 +00:00
drh
dc5b047ec3 Fix a performance regression: Keep two btree masks in each prepared 
statement; one for btrees used and another for btrees that require locks.
Only try to lock the btrees identified by the second mask.

FossilOrigin-Name: 614de91a504d2231009a9de1305e31fce1b1c5a6
 2011-04-06 22:05:53 +00:00
drh
1a86f50d85 Simplifications to the sqlite3BtreeEnterAll() and LeaveAll() routines. 
Just have them call BtreeEnter and BtreeLeave() repeatedly rather than
trying to be clever.

FossilOrigin-Name: 51039b3578f948c23a810d176e81fa51a278fb28
 2011-04-05 19:27:41 +00:00
drh
e54e051800 Remove the mutex counter and the logic that attempts to verify that btree 
mutexes are held continuously.  We are not making that assumption at this
time.

FossilOrigin-Name: 242ce7cff416a87d57d4eb624cb79fa4e2215559
 2011-04-05 17:31:56 +00:00
drh
2120608e0f Add a description of access rules for the Schema object and lots of asserts 
to verify that the access rules are followed.

FossilOrigin-Name: ae8374af057b6e6546e9265148cfffe32fcb0849
 2011-04-04 18:22:02 +00:00
drh
bdaec52c62 Remove the BtreeMutexArray object - use the Vdbe.btreeMask field to accomplish 
the same result.  Add a generation counter to btree mutexes in order to assert
that mutexes are never temporarily dropped over a range of instructions in order
to do deadlock avoidance in some subroutine.  Lock all btrees in any Vdbe
program that uses OP_ParseSchema.

FossilOrigin-Name: d81708f7d1eee399bfe76f6b8dac950a85dc2582
 2011-04-04 00:14:43 +00:00
drh
4fa7d7c0df Fix typos in comments. No changes to code. 
FossilOrigin-Name: 28c5f12e98655d5c6167b13e8a15085eca43dd5b
 2011-04-03 02:41:00 +00:00
drh
c81c11f62c Remove the obsolete "$Id:$" RCS identifier strings from the source code. 
FossilOrigin-Name: f6c045f649036958078cb15cd9d5453680c82b0c
 2009-11-10 01:30:52 +00:00
drh
5dea3158fc Use an ALWAYS() on a conditional in btmutex.c that is always true. (CVS 6910) 
FossilOrigin-Name: 609022caff12c010575e704be550da6f52226d33
 2009-07-20 12:33:32 +00:00
drh
f18a61dd59 Code simplifications in support of structural testing. (CVS 6900) 
FossilOrigin-Name: fb1b955dda5105025ef199880afa871e44331d65
 2009-07-17 11:44:07 +00:00
danielk1977
f7590db099 Changes to ensure that when running in shared-cache mode with a non-threadsafe build, the correct busy-handler callback is always invoked. (CVS 6481) 
FossilOrigin-Name: 683e4bd74783e6e3f6cf75f9582008c7b7e02a01
 2009-04-10 12:55:16 +00:00
danielk1977
2a50ff0309 Always set BtShared.db when entering the BtShared mutex. Ticket #3793. (CVS 6480) 
FossilOrigin-Name: ed6620ba589ddbb6ca86f42a7652e3b019195647
 2009-04-10 09:47:06 +00:00
shane
be21779385 Corrected typos and misspellings. Ticket #3702. (CVS 6336) 
FossilOrigin-Name: 6404afa0c515a6536fc2e878d4fb451e4dc06942
 2009-03-05 04:20:31 +00:00
danielk1977
00e136135e Modifications to avoid unsigned/signed comparisons in various files. (CVS 5914) 
FossilOrigin-Name: 8009220c36635dd9b6efea7dc13281ca9625c40a
 2008-11-17 19:18:54 +00:00
drh
18472fa7b8 Remove the SQLITE_MUTEX_APPDEF compile-time option. The SQLITE_THREADSAFE=0 
option always removes all mutex code.  For application-defined mutexes only,
use SQLITE_THREADSAFE=1 with SQLITE_MUTEX_NOOP=1.  Ticket #3421. (CVS 5779)

FossilOrigin-Name: 02a12eb1cfe9307c66556105a1a99d657cc01ab5
 2008-10-07 15:25:48 +00:00
drh
65cef1affc Add a new test script to exercise the deadlock avoidance code in the 
btree mutex logic. (CVS 5412)

FossilOrigin-Name: 7d5e1c4375599a913d23e5954fa63c10ac9d7688
 2008-07-14 19:39:16 +00:00
drh
01495b9921 Improvements to test coverage in the lemon-generated parser and in the 
sqlite3_get_table() interface. (CVS 4745)

FossilOrigin-Name: 9f95d79daeb5e7f6fd62f3c896dae4d332121d1c
 2008-01-23 12:52:40 +00:00
drh
e5fe690d75 In shared-cache mode, make sure the busy hander invoked is the 
busy handler associated with the database connection that caused
the lock contention in the first place. (CVS 4598)

FossilOrigin-Name: c9eb65912f61ce0a6b66fe253652a1827e46b12a
 2007-12-07 18:55:28 +00:00
drh
fb98264aab Fix for the sqlite3AbortOtherActiveVdbes() problem. (CVS 4328) 
FossilOrigin-Name: e40d40a5d41c491bef852a92e5846b273b206909
 2007-08-30 01:19:59 +00:00
drh
ff0587c632 Improvements to mutex asserts. The quick test runs to completion without 
assertion faults. (CVS 4324)

FossilOrigin-Name: 2732af0ec77dbc90c0439b6a61d893d9ea3b5697
 2007-08-29 17:43:19 +00:00
drh
1fee73e74a Better asserts(). But now some of the tests are busted again. (CVS 4320) 
FossilOrigin-Name: e8060f85e7871572e2a38dc96f03e6e1f34cc8fd
 2007-08-29 04:00:57 +00:00
drh
b1ab8ea7f3 More locking fixes. Now makes it all the way through quick.test. There 
are errors but no assertion faults.  Progress. (CVS 4319)

FossilOrigin-Name: 844d40b8379d3374130e2d94f6e32c2cda34e0ca
 2007-08-29 00:33:07 +00:00
drh
4cf7c7f7e7 The shared_err test runs with no errors. But a potential deadlock has been 
discovered and is still unfixed. (CVS 4317)

FossilOrigin-Name: f84550be0a0c9e5859b852863b9a8f8ed3fd6919
 2007-08-28 23:28:07 +00:00
drh
ac32155213 Fix locking bug in btshared.c. (CVS 4313) 
FossilOrigin-Name: af24e7d01a7fab5e33080a0f786e0bc6f610a6f3
 2007-08-28 16:44:20 +00:00
drh
900b31ef49 Work toward correct btree locking in a multithreaded environment. (CVS 4307) 
FossilOrigin-Name: b8cc493b47e618648f645ab73eb0253739e03fcd
 2007-08-28 02:27:51 +00:00