sqlite/test/walblock.test

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# 2015 Mar 17
#
# 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.
#
#***********************************************************************
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/lock_common.tcl
source $testdir/wal_common.tcl
finish_test; return; # Feature currently not implemented.
ifcapable !wal {finish_test ; return }
if {$::tcl_platform(platform)!="unix"} { finish_test ; return }
set testprefix walblock
catch { db close }
testvfs tvfs -fullshm 1
foreach f [glob test.db*] { forcedelete $f }
sqlite3 db test.db -vfs tvfs
do_execsql_test 1.1.0 {
CREATE TABLE t1(x, y);
INSERT INTO t1 VALUES(1, 2);
INSERT INTO t1 VALUES(3, 4);
INSERT INTO t1 VALUES(5, 6);
PRAGMA journal_mode = wal;
INSERT INTO t1 VALUES(7, 8);
} {wal}
do_test 1.1.1 {
lsort [glob test.db*]
} {test.db test.db-shm test.db-wal}
do_test 1.1.2 {
set C [launch_testfixture]
testfixture $C {
sqlite3 db test.db
db eval { SELECT * FROM t1 }
}
} {1 2 3 4 5 6 7 8}
do_test 1.1.3 {
set ::out [list]
testfixture $C {
db eval { SELECT * FROM t1 }
} [list set ::out]
set ::out
} {}
do_test 1.1.4 {
vwait ::out
set ::out
} {1 2 3 4 5 6 7 8}
#
# Test that if a read client cannot read the wal-index header because a
# write client is in the middle of updating it, the reader blocks until
# the writer finishes.
#
# 1. Open a write transaction using client [db] in this process.
#
# 2. Attempt to commit the write transaction. Intercept the xShmBarrier()
# call made by the writer between updating the two copies of the
# wal-index header.
#
# 3. Within the xShmBarrier() callback, make an asynchronous request to
# the other process to read from the database. It should block, as it
# cannot get read the wal-index header.
#
# 4. Still in xShmBarrier(), wait for 5 seconds. Check that the other
# process has not answered the request.
#
# 5: Finish committing the transaction. Then wait for 0.5 seconds more.
# Ensure that the second process has by this stage read the database
# and that the snapshot it read included the transaction committed in
# step (4).
#
do_execsql_test 1.2.1 {
BEGIN;
INSERT INTO t1 VALUES(9, 10);
} {}
tvfs script barrier_callback
tvfs filter xShmBarrier
proc barrier_callback {method args} {
set ::out ""
testfixture $::C { db eval { SELECT * FROM t1 } } {set ::out}
do_test "1.2.2.(blocking 10 seconds)" {
set ::continue 0
after 10000 {set ::continue 1}
vwait ::continue
set ::out
} {}
}
execsql COMMIT
do_test "1.2.3.(blocking 0.5 seconds)" {
set ::continue 0
after 500 {set ::continue 1}
vwait ::continue
set ::out
} {1 2 3 4 5 6 7 8 9 10}
finish_test