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# 2016 February 04
#
# 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 tests the effect of the mmap() or mremap() system calls
# returning an error on the library.
#
# If either mmap() or mremap() fails, SQLite should log an error
# message, then continue accessing the database using read() and
# write() exclusively.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable !mmap {
finish_test
return
}
source $testdir/lock_common.tcl
set testprefix mmap4
# Return a Tcl script that registers a user-defined scalar function
# named rblob() with database handle $dbname. The function returns a
# sequence of pseudo-random blobs based on seed value $seed.
#
proc register_rblob_code {dbname seed} {
return [subst -nocommands {
set ::rcnt $seed
proc rblob {n} {
set ::rcnt [expr (([set ::rcnt] << 3) + [set ::rcnt] + 456) & 0xFFFFFFFF]
set str [format %.8x [expr [set ::rcnt] ^ 0xbdf20da3]]
string range [string repeat [set str] [expr [set n]/4]] 1 [set n]
}
$dbname func rblob rblob
}]
}
#-------------------------------------------------------------------------
# Test various mmap_size settings.
#
foreach {tn1 mmap1 mmap2} {
1 6144 167773
2 18432 140399
3 43008 401302
4 92160 253899
5 190464 2
6 387072 752431
7 780288 291143
8 1566720 594306
9 3139584 829137
10 6285312 793963
11 12576768 1015590
} {
do_multiclient_test tn {
sql1 {
CREATE TABLE t1(a PRIMARY KEY);
CREATE TABLE t2(x);
INSERT INTO t2 VALUES('');
}
code1 [register_rblob_code db 0]
code2 [register_rblob_code db2 444]
sql1 "PRAGMA mmap_size = $mmap1"
sql2 "PRAGMA mmap_size = $mmap2"
do_test $tn1.$tn {
for {set i 1} {$i <= 100} {incr i} {
if {$i % 2} {
set c1 sql1
set c2 sql2
} else {
set c1 sql2
set c2 sql1
}
$c1 {
INSERT INTO t1 VALUES( rblob(5000) );
UPDATE t2 SET x = (SELECT md5sum(a) FROM t1);
}
set res [$c2 {
SELECT count(*) FROM t1;
SELECT x == (SELECT md5sum(a) FROM t1) FROM t2;
PRAGMA integrity_check;
}]
if {$res != [list $i 1 ok]} {
do_test $tn1.$tn.$i {
set ::res
} [list $i 1 ok]
}
}
set res 1
} {1}
}
}
finish_test
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