gitlab.com/CoiaPrant/sqlite3@v1.19.1/testdata/tcl/lock4.test (about) 1 # 2007 April 6 2 # 3 # The author disclaims copyright to this source code. In place of 4 # a legal notice, here is a blessing: 5 # 6 # May you do good and not evil. 7 # May you find forgiveness for yourself and forgive others. 8 # May you share freely, never taking more than you give. 9 # 10 #*********************************************************************** 11 # This file implements regression tests for SQLite library. The 12 # focus of this script is database locks. 13 # 14 # $Id: lock4.test,v 1.10 2009/05/06 00:52:41 drh Exp $ 15 16 17 set testdir [file dirname $argv0] 18 source $testdir/tester.tcl 19 20 if {[atomic_batch_write test.db]} { 21 # This test uses two processes, one of which blocks until the other 22 # creates a *-journal file. Which doesn't work if atomic writes are 23 # available. 24 finish_test 25 return 26 } 27 28 do_not_use_codec 29 30 # Initialize the test.db database so that it is non-empty 31 # 32 do_test lock4-1.1 { 33 db eval { 34 PRAGMA auto_vacuum=OFF; 35 CREATE TABLE t1(x); 36 } 37 forcedelete test2.db test2.db-journal 38 sqlite3 db2 test2.db 39 db2 eval { 40 PRAGMA auto_vacuum=OFF; 41 CREATE TABLE t2(x) 42 } 43 db2 close 44 list [file size test.db] [file size test2.db] 45 } {2048 2048} 46 47 # Create a script to drive a separate process that will 48 # 49 # 1. Create a second database test2.db 50 # 2. Get an exclusive lock on test2.db 51 # 3. Add an entry to test.db in table t1, waiting as necessary. 52 # 4. Commit the change to test2.db. 53 # 54 # Meanwhile, this process will: 55 # 56 # A. Get an exclusive lock on test.db 57 # B. Attempt to read from test2.db but get an SQLITE_BUSY error. 58 # C. Commit the changes to test.db thus alloing the other process 59 # to continue. 60 # 61 do_test lock4-1.2 { 62 63 # Create a script for the second process to run. 64 # 65 set out [open test2-script.tcl w] 66 puts $out "sqlite3_test_control_pending_byte [set sqlite_pending_byte]" 67 puts $out { 68 sqlite3 db2 test2.db 69 db2 eval { 70 BEGIN; 71 INSERT INTO t2 VALUES(2); 72 } 73 sqlite3 db test.db 74 db timeout 1000000 75 db eval { 76 INSERT INTO t1 VALUES(2); 77 } 78 db close 79 db2 eval COMMIT 80 exit 81 } 82 close $out 83 84 # Begin a transaction on test.db. 85 db eval { 86 BEGIN EXCLUSIVE; 87 INSERT INTO t1 VALUES(1); 88 } 89 90 # Kick off the second process. 91 exec [info nameofexec] ./test2-script.tcl & 92 93 # Wait until the second process has started its transaction on test2.db. 94 while {![file exists test2.db-journal]} { 95 after 10 96 } 97 98 # Try to write to test2.db. We are locked out. 99 sqlite3 db2 test2.db 100 catchsql { 101 INSERT INTO t2 VALUES(1) 102 } db2 103 } {1 {database is locked}} 104 do_test lock4-1.3 { 105 db eval { 106 COMMIT; 107 } 108 while {[file exists test2.db-journal]} { 109 after 10 110 } 111 # The other process has committed its transaction on test2.db by 112 # deleting the journal file. But it might retain the lock for a 113 # fraction longer 114 # 115 after 25 116 db2 eval { 117 SELECT * FROM t2 118 } 119 } {2} 120 121 122 do_test lock4-999.1 { 123 rename db2 {} 124 } {} 125 126 finish_test