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Diffstat (limited to 'test/tkt3793.test')
| -rw-r--r-- | test/tkt3793.test | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/test/tkt3793.test b/test/tkt3793.test new file mode 100644 index 0000000..07e47eb --- /dev/null +++ b/test/tkt3793.test @@ -0,0 +1,112 @@ +# 2009 April 10 +# +# The author disclaims copyright to this source code. In place of +# a legal notice, here is a blessing: +# +# May you do good and not evil. +# May you find forgiveness for yourself and forgive others. +# May you share freely, never taking more than you give. +# +#*********************************************************************** +# This file implements regression tests for SQLite library. +# +# This file implements tests to verify that ticket #3793 has been +# fixed. +# + + +set testdir [file dirname $argv0] +source $testdir/tester.tcl + +ifcapable !shared_cache||!attach { + finish_test + return +} +set ::enable_shared_cache [sqlite3_enable_shared_cache 1] + +do_test tkt3793-1.1 { + db close + sqlite3 db "file:test.db" -uri 1 + sqlite3 db1 "file:test.db?cache=private" -uri 1 + sqlite3 db2 "file:test.db?cache=shared" -uri 1 + execsql { + BEGIN; + CREATE TABLE t1(a, b); + CREATE TABLE t2(a PRIMARY KEY, b); + INSERT INTO t1 VALUES(randstr(50,50), randstr(50,50)); + INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; + INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; + INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; + INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; + INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; + INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; + INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; + INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; + INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; + INSERT INTO t1 SELECT randstr(50,50), randstr(50,50) FROM t1; + INSERT INTO t2 SELECT * FROM t1; + COMMIT; + } +} {} + +proc busyhandler {db args} { set ::busyconnection $db ; return 1 } +db2 busy {busyhandler db2} +db1 busy {busyhandler db1} + +# Establish a read-lock on the database file using connection [db]. +# +do_test tkt3793-1.2 { + execsql { + BEGIN; + SELECT count(*) FROM t1; + } +} {1024} + +# Set the size of the cache shared by [db1] and [db2] to 10. Then update +# more than 10 pages of table t1. At this point the shared-cache will +# hold a RESERVED lock on the database file. Even though there are now +# more than 10 dirty pages in memory, it cannot upgrade to an EXCLUSIVE +# lock because of the read-lock held by [db]. +# +do_test tkt3793-1.3 { + execsql { + PRAGMA cache_size = 10; + BEGIN; + UPDATE t1 SET b = randstr(50,50); + } db1 +} {} + +set x 0 + +# Run one SELECT query on the shared-cache using [db1], then from within +# the callback run another via [db2]. Because of the large number of dirty +# pages within the cache, each time a new page is read from the database +# SQLite will attempt to upgrade to an EXCLUSIVE lock, and hence invoke +# the busy-handler. The tests here verify that the correct busy-handler +# function is invoked (the busy-handler associated with the database +# connection that called sqlite3_step()). When bug #3793 existed, sometimes +# the [db2] busy-handler was invoked from within the call to sqlite3_step() +# associated with [db1]. +# +# Note: Before the bug was fixed, if [db2] was opened with the "-fullmutex 1" +# option, then this test case would cause an assert() to fail. +# +ifcapable threadsafe { + set ::busyconnection db1 + db1 eval {SELECT * FROM t2 ORDER BY a LIMIT 20} { + do_test tkt3793-2.[incr x] { set ::busyconnection } db1 + set ::busyconnection db2 + + db2 eval { SELECT count(*) FROM t2 } + do_test tkt3793-2.[incr x] { set ::busyconnection } db2 + set ::busyconnection db1 + } +} + +do_test tkt3793-3 { + db1 close + db2 close +} {} + +sqlite3_enable_shared_cache $::enable_shared_cache +finish_test |