91 lines
2.9 KiB
Plaintext
91 lines
2.9 KiB
Plaintext
# 2012 October 15
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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# This test case tests that a problem causing a failing assert() has
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# been fixed. The problem occurred if a writer process with a subset
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# of the *shm file mapped rolled back a transaction begun after the
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# entire WAL file was checkpointed into the db file (i.e. a transaction
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# that would have restarted the WAL file from the beginning).
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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set testprefix wal9
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sqlite3 db2 test.db
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do_execsql_test 1.0 {
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PRAGMA page_size = 1024;
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PRAGMA journal_mode = WAL;
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PRAGMA wal_autocheckpoint = 0;
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CREATE TABLE t(x);
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} {wal 0}
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do_test 1.1 {
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execsql "SELECT * FROM t" db2
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} {}
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do_execsql_test 1.2 {
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BEGIN;
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INSERT INTO t VALUES(randomblob(100));
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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INSERT INTO t SELECT randomblob(100) FROM t;
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COMMIT;
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} {}
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# Check file sizes are as expected. The real requirement here is that
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# the *shm file is now more than one chunk (>32KiB).
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do_test 1.3 { file size test.db } {1024}
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do_test 1.4 { file size test.db-wal } {15421352}
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do_test 1.5 { file size test.db-shm } {131072}
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do_execsql_test 1.6 { PRAGMA wal_checkpoint } {0 14715 14715}
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# At this point connection [db2] has mapped the first 32KB of the *shm file
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# only. Because the entire WAL file has been checkpointed, it is not
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# necessary to map any more of the *-shm file to read or write the database
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# (since all data will be read directly from the db file).
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#
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# However, at one point if a transaction that had not yet written to the
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# WAL file was rolled back an assert() attempting to verify that the entire
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# *-shm file was mapped would fail. If NDEBUG was defined (and the assert()
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# disabled) this bug caused SQLite to ignore the return code of a mmap()
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# call.
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#
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do_test 1.7 {
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execsql {
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BEGIN;
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INSERT INTO t VALUES('hello');
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ROLLBACK;
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} db2
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} {}
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db2 close
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finish_test
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