# 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