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

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

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Avoid many unnecessary calls to sqlite3ReadSchema() and sqlite3Init() when
the schema is known to be valid already.

FossilOrigin-Name: 58cf812fd81329e82b3fdd61b7ad2040c9b90d2d80f592b9231e0e1902c8d577

Avoid unnecessary calls to sqlite3BtreeEnterAll() and sqlite3BtreeLeaveAll()
when no btree is using shared-cache.

FossilOrigin-Name: cfb3158204628eb2fd170090a7f212df0e4ce6c9

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

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

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Add an assert() to check that the database mutex is held in sqlite3BtreeLeave().

FossilOrigin-Name: 31f54d7b0798e70da6a60b8ea3c5d9e35dce164c

Fix typos in comments. No code changes.

FossilOrigin-Name: e62aab5e9290503869e1f4d5e0fefd2b4dee0a69

Performance enhancements in the b-tree mutex logic.

FossilOrigin-Name: 8914530644f938a7a98e25ea1fb0bca1f9d79101

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 mas

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

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Simplifications to the sqlite3BtreeEnterAll() and LeaveAll() routines.
Just have them call BtreeEnter and BtreeLeave() repeatedly rather than
trying to be clever.

FossilOrigin-Name: 51039b3578f948c2

Simplifications to the sqlite3BtreeEnterAll() and LeaveAll() routines.
Just have them call BtreeEnter and BtreeLeave() repeatedly rather than
trying to be clever.

FossilOrigin-Name: 51039b3578f948c23a810d176e81fa51a278fb28

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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: 242ce7cff416a87d57d4eb624

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

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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

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 droppe

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

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Fix typos in comments. No changes to code.

FossilOrigin-Name: 28c5f12e98655d5c6167b13e8a15085eca43dd5b

Remove the obsolete "$Id:$" RCS identifier strings from the source code.

FossilOrigin-Name: f6c045f649036958078cb15cd9d5453680c82b0c

Use an ALWAYS() on a conditional in btmutex.c that is always true. (CVS 6910)

FossilOrigin-Name: 609022caff12c010575e704be550da6f52226d33

Code simplifications in support of structural testing. (CVS 6900)

FossilOrigin-Name: fb1b955dda5105025ef199880afa871e44331d65

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: 683e4bd74783e6e3f6cf75f958200

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

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Always set BtShared.db when entering the BtShared mutex. Ticket #3793. (CVS 6480)

FossilOrigin-Name: ed6620ba589ddbb6ca86f42a7652e3b019195647

Corrected typos and misspellings. Ticket #3702. (CVS 6336)

FossilOrigin-Name: 6404afa0c515a6536fc2e878d4fb451e4dc06942

Modifications to avoid unsigned/signed comparisons in various files. (CVS 5914)

FossilOrigin-Name: 8009220c36635dd9b6efea7dc13281ca9625c40a

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_NOO

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

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Add a new test script to exercise the deadlock avoidance code in the
btree mutex logic. (CVS 5412)

FossilOrigin-Name: 7d5e1c4375599a913d23e5954fa63c10ac9d7688

Improvements to test coverage in the lemon-generated parser and in the
sqlite3_get_table() interface. (CVS 4745)

FossilOrigin-Name: 9f95d79daeb5e7f6fd62f3c896dae4d332121d1c

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:

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

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Fix for the sqlite3AbortOtherActiveVdbes() problem. (CVS 4328)

FossilOrigin-Name: e40d40a5d41c491bef852a92e5846b273b206909