[sqlite] Remove obsolete reference version 3.8.7.4.

third_party/sqlite/sqlite-src-3080704/test/wal3.test

-# 2010 April 13
-#
-# 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 implements regression tests for SQLite library.  The
-# focus of this file is testing the operation of the library in
-# "PRAGMA journal_mode=WAL" mode.
-#
-
-set testdir [file dirname $argv0]
-source $testdir/tester.tcl
-source $testdir/lock_common.tcl
-source $testdir/wal_common.tcl
-source $testdir/malloc_common.tcl
-ifcapable !wal {finish_test ; return }
-
-set a_string_counter 1
-proc a_string {n} {
-  global a_string_counter
-  incr a_string_counter
-  string range [string repeat "${a_string_counter}." $n] 1 $n
-}
-db func a_string a_string
-
-#-------------------------------------------------------------------------
-# When a rollback or savepoint rollback occurs, the client may remove
-# elements from one of the hash tables in the wal-index. This block
-# of test cases tests that nothing appears to go wrong when this is
-# done.
-#
-do_test wal3-1.0 {
-  execsql {
-    PRAGMA cache_size = 2000;
-    PRAGMA page_size = 1024;
-    PRAGMA auto_vacuum = off;
-    PRAGMA synchronous = normal;
-    PRAGMA journal_mode = WAL;
-    PRAGMA wal_autocheckpoint = 0;
-    BEGIN;
-      CREATE TABLE t1(x);
-      INSERT INTO t1 VALUES( a_string(800) );                  /*    1 */
-      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*    2 */
-      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*    4 */
-      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*    8 */
-      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*   16 */
-      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*   32 */
-      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*   64 */
-      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*  128*/
-      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*  256 */
-      INSERT INTO t1 SELECT a_string(800) FROM t1;             /*  512 */
-      INSERT INTO t1 SELECT a_string(800) FROM t1;             /* 1024 */
-      INSERT INTO t1 SELECT a_string(800) FROM t1;             /* 2048 */
-      INSERT INTO t1 SELECT a_string(800) FROM t1 LIMIT 1970;  /* 4018 */
-    COMMIT;
-    PRAGMA cache_size = 10;
-  }
-  wal_frame_count test.db-wal 1024
-} 4056
-
-for {set i 1} {$i < 50} {incr i} {
-
-  do_test wal3-1.$i.1 {
-    set str [a_string 800]
-    execsql { UPDATE t1 SET x = $str WHERE rowid = $i }
-    lappend L [wal_frame_count test.db-wal 1024]
-    execsql {
-      BEGIN;
-        INSERT INTO t1 SELECT a_string(800) FROM t1 LIMIT 100;
-      ROLLBACK;
-      PRAGMA integrity_check;
-    }
-  } {ok}
-
-  # Check that everything looks OK from the point of view of an 
-  # external connection.
-  #
-  sqlite3 db2 test.db
-  do_test wal3-1.$i.2 {
-    execsql { SELECT count(*) FROM t1 } db2
-  } 4018
-  do_test wal3-1.$i.3 {
-    execsql { SELECT x FROM t1 WHERE rowid = $i }
-  } $str
-  do_test wal3-1.$i.4 {
-    execsql { PRAGMA integrity_check } db2
-  } {ok}
-  db2 close
-  
-  # Check that the file-system in its current state can be recovered.
-  # 
-  forcecopy test.db test2.db
-  forcecopy test.db-wal test2.db-wal
-  forcedelete test2.db-journal
-  sqlite3 db2 test2.db
-  do_test wal3-1.$i.5 {
-    execsql { SELECT count(*) FROM t1 } db2
-  } 4018
-  do_test wal3-1.$i.6 {
-    execsql { SELECT x FROM t1 WHERE rowid = $i }
-  } $str
-  do_test wal3-1.$i.7 {
-    execsql { PRAGMA integrity_check } db2
-  } {ok}
-  db2 close
-}
-
-proc byte_is_zero {file offset} {
-  if {[file size test.db] <= $offset} { return 1 }
-  expr { [hexio_read $file $offset 1] == "00" }
-}
-
-do_multiclient_test i {
-
-  set testname(1) multiproc
-  set testname(2) singleproc
-  set tn $testname($i)
-
-  do_test wal3-2.$tn.1 {
-    sql1 { 
-      PRAGMA page_size = 1024;
-      PRAGMA journal_mode = WAL;
-    }
-    sql1 {
-      CREATE TABLE t1(a, b);
-      INSERT INTO t1 VALUES(1, 'one');
-      BEGIN;
-        SELECT * FROM t1;
-    }
-  } {1 one}
-  do_test wal3-2.$tn.2 {
-    sql2 {
-      CREATE TABLE t2(a, b);
-      INSERT INTO t2 VALUES(2, 'two');
-      BEGIN;
-        SELECT * FROM t2;
-    }
-  } {2 two}
-  do_test wal3-2.$tn.3 {
-    sql3 {
-      CREATE TABLE t3(a, b);
-      INSERT INTO t3 VALUES(3, 'three');
-      BEGIN;
-        SELECT * FROM t3;
-    }
-  } {3 three}
-
-  # Try to checkpoint the database using [db]. It should be possible to
-  # checkpoint everything except the table added by [db3] (checkpointing
-  # these frames would clobber the snapshot currently being used by [db2]).
-  #
-  # After [db2] has committed, a checkpoint can copy the entire log to the
-  # database file. Checkpointing after [db3] has committed is therefore a
-  # no-op, as the entire log has already been backfilled.
-  #
-  do_test wal3-2.$tn.4 {
-    sql1 {
-      COMMIT;
-      PRAGMA wal_checkpoint;
-    }
-    byte_is_zero test.db [expr $AUTOVACUUM ? 4*1024 : 3*1024]
-  } {1}
-  do_test wal3-2.$tn.5 {
-    sql2 {
-      COMMIT;
-      PRAGMA wal_checkpoint;
-    }
-    list [byte_is_zero test.db [expr $AUTOVACUUM ? 4*1024 : 3*1024]]   \
-         [byte_is_zero test.db [expr $AUTOVACUUM ? 5*1024 : 4*1024]]
-  } {0 1}
-  do_test wal3-2.$tn.6 {
-    sql3 {
-      COMMIT;
-      PRAGMA wal_checkpoint;
-    }
-    list [byte_is_zero test.db [expr $AUTOVACUUM ? 4*1024 : 3*1024]]   \
-         [byte_is_zero test.db [expr $AUTOVACUUM ? 5*1024 : 4*1024]]
-  } {0 1}
-}
-catch {db close}
-
-#-------------------------------------------------------------------------
-# Test that that for the simple test:
-#
-#   CREATE TABLE x(y);
-#   INSERT INTO x VALUES('z');
-#   PRAGMA wal_checkpoint;
-#
-# in WAL mode the xSync method is invoked as expected for each of
-# synchronous=off, synchronous=normal and synchronous=full.
-#
-foreach {tn syncmode synccount} {
-  1 off     
-    {}
-  2 normal  
-    {test.db-wal normal test.db normal}
-  3 full    
-    {test.db-wal normal test.db-wal normal test.db-wal normal test.db normal}
-} {
-
-  proc sync_counter {args} { 
-    foreach {method filename id flags} $args break
-    lappend ::syncs [file tail $filename] $flags
-  }
-  do_test wal3-3.$tn {
-    forcedelete test.db test.db-wal test.db-journal
-  
-    testvfs T
-    T filter {} 
-    T script sync_counter
-    sqlite3 db test.db -vfs T
-  
-    execsql "PRAGMA synchronous = $syncmode"
-    execsql { PRAGMA journal_mode = WAL }
-    execsql { CREATE TABLE filler(a,b,c); }
-
-    set ::syncs [list]
-    T filter xSync
-    execsql {
-      CREATE TABLE x(y);
-      INSERT INTO x VALUES('z');
-      PRAGMA wal_checkpoint;
-    }
-    T filter {}
-    set ::syncs
-  } $synccount
-
-  db close
-  T delete
-}
-
-#-------------------------------------------------------------------------
-# When recovering the contents of a WAL file, a process obtains the WRITER
-# lock, then locks all other bytes before commencing recovery. If it fails
-# to lock all other bytes (because some other process is holding a read
-# lock) it should retry up to 100 times. Then return SQLITE_PROTOCOL to the 
-# caller. Test this (test case wal3-4.3).
-#
-# Also test the effect of hitting an SQLITE_BUSY while attempting to obtain
-# the WRITER lock (should be the same). Test case wal3-4.4.
-# 
-proc lock_callback {method filename handle lock} {
-  lappend ::locks $lock
-}
-do_test wal3-4.1 {
-  testvfs T
-  T filter xShmLock 
-  T script lock_callback
-  set ::locks [list]
-  sqlite3 db test.db -vfs T
-  execsql { SELECT * FROM x }
-  lrange $::locks 0 3
-} [list {0 1 lock exclusive} {1 7 lock exclusive}      \
-        {1 7 unlock exclusive} {0 1 unlock exclusive}  \
-]
-do_test wal3-4.2 {
-  db close
-  set ::locks [list]
-  sqlite3 db test.db -vfs T
-  execsql { SELECT * FROM x }
-  lrange $::locks 0 3
-} [list {0 1 lock exclusive} {1 7 lock exclusive}      \
-        {1 7 unlock exclusive} {0 1 unlock exclusive}  \
-]
-proc lock_callback {method filename handle lock} {
-  if {$lock == "1 7 lock exclusive"} { return SQLITE_BUSY }
-  return SQLITE_OK
-}
-puts "  Warning: This next test case causes SQLite to call xSleep(1) 100 times."
-puts "  Normally this equates to a 100ms delay, but if SQLite is built on unix"
-puts "  without HAVE_USLEEP defined, it may be 100 seconds."
-do_test wal3-4.3 {
-  db close
-  set ::locks [list]
-  sqlite3 db test.db -vfs T
-  catchsql { SELECT * FROM x }
-} {1 {locking protocol}}
-
-puts "  Warning: Same again!"
-proc lock_callback {method filename handle lock} {
-  if {$lock == "0 1 lock exclusive"} { return SQLITE_BUSY }
-  return SQLITE_OK
-}
-do_test wal3-4.4 {
-  db close
-  set ::locks [list]
-  sqlite3 db test.db -vfs T
-  catchsql { SELECT * FROM x }
-} {1 {locking protocol}}
-db close
-T delete
-
-
-#-------------------------------------------------------------------------
-# Only one client may run recovery at a time. Test this mechanism.
-#
-# When client-2 tries to open a read transaction while client-1 is 
-# running recovery, it fails to obtain a lock on an aReadMark[] slot
-# (because they are all locked by recovery). It then tries to obtain
-# a shared lock on the RECOVER lock to see if there really is a
-# recovery running or not.
-#
-# This block of tests checks the effect of an SQLITE_BUSY or SQLITE_IOERR
-# being returned when client-2 attempts a shared lock on the RECOVER byte.
-#
-# An SQLITE_BUSY should be converted to an SQLITE_BUSY_RECOVERY. An
-# SQLITE_IOERR should be returned to the caller.
-#
-do_test wal3-5.1 {
-  faultsim_delete_and_reopen
-  execsql {
-    PRAGMA journal_mode = WAL;
-    CREATE TABLE t1(a, b);
-    INSERT INTO t1 VALUES(1, 2);
-    INSERT INTO t1 VALUES(3, 4);
-  }
-  faultsim_save_and_close
-} {}
-
-testvfs T -default 1
-T script method_callback
-
-proc method_callback {method args} {
-  if {$method == "xShmBarrier"} {
-    incr ::barrier_count
-    if {$::barrier_count == 2} {
-      # This code is executed within the xShmBarrier() callback invoked
-      # by the client running recovery as part of writing the recovered
-      # wal-index header. If a second client attempts to access the 
-      # database now, it reads a corrupt (partially written) wal-index
-      # header. But it cannot even get that far, as the first client
-      # is still holding all the locks (recovery takes an exclusive lock
-      # on *all* db locks, preventing access by any other client).
-      #
-      # If global variable ::wal3_do_lockfailure is non-zero, then set
-      # things up so that an IO error occurs within an xShmLock() callback
-      # made by the second client (aka [db2]).
-      #
-      sqlite3 db2 test.db
-      if { $::wal3_do_lockfailure } { T filter xShmLock }
-      set ::testrc [ catch { db2 eval "SELECT * FROM t1" } ::testmsg ]
-      T filter {}
-      db2 close
-    }
-  }
-
-  if {$method == "xShmLock"} {
-    foreach {file handle spec} $args break
-    if { $spec == "2 1 lock shared" } {
-      return SQLITE_IOERR
-    }
-  }
-
-  return SQLITE_OK
-}
-
-# Test a normal SQLITE_BUSY return.
-#
-T filter xShmBarrier
-set testrc ""
-set testmsg ""
-set barrier_count 0
-set wal3_do_lockfailure 0
-do_test wal3-5.2 {
-  faultsim_restore_and_reopen
-  execsql { SELECT * FROM t1 }
-} {1 2 3 4}
-do_test wal3-5.3 {
-  list $::testrc $::testmsg
-} {1 {database is locked}}
-db close
-
-# Test an SQLITE_IOERR return.
-#
-T filter xShmBarrier
-set barrier_count 0
-set wal3_do_lockfailure 1
-set testrc ""
-set testmsg ""
-do_test wal3-5.4 {
-  faultsim_restore_and_reopen
-  execsql { SELECT * FROM t1 }
-} {1 2 3 4}
-do_test wal3-5.5 {
-  list $::testrc $::testmsg
-} {1 {disk I/O error}}
-
-db close
-T delete
-
-#-------------------------------------------------------------------------
-# When opening a read-transaction on a database, if the entire log has
-# already been copied to the database file, the reader grabs a special
-# kind of read lock (on aReadMark[0]). This set of test cases tests the 
-# outcome of the following:
-#
-#   + The reader discovering that between the time when it determined 
-#     that the log had been completely backfilled and the lock is obtained
-#     that a writer has written to the log. In this case the reader should
-#     acquire a different read-lock (not aReadMark[0]) and read the new
-#     snapshot.
-#
-#   + The attempt to obtain the lock on aReadMark[0] fails with SQLITE_BUSY.
-#     This can happen if a checkpoint is ongoing. In this case also simply
-#     obtain a different read-lock.
-#
-catch {db close}
-testvfs T -default 1
-do_test wal3-6.1.1 {
-  forcedelete test.db test.db-journal test.db wal
-  sqlite3 db test.db
-  execsql { PRAGMA auto_vacuum = off }
-  execsql { PRAGMA journal_mode = WAL }
-  execsql {
-    CREATE TABLE t1(a, b);
-    INSERT INTO t1 VALUES('o', 't');
-    INSERT INTO t1 VALUES('t', 'f');
-  }
-} {}
-do_test wal3-6.1.2 {
-  sqlite3 db2 test.db
-  sqlite3 db3 test.db
-  execsql { BEGIN ; SELECT * FROM t1 } db3
-} {o t t f}
-do_test wal3-6.1.3 {
-  execsql { PRAGMA wal_checkpoint } db2
-} {0 4 4}
-
-# At this point the log file has been fully checkpointed. However, 
-# connection [db3] holds a lock that prevents the log from being wrapped.
-# Test case 3.6.1.4 has [db] attempt a read-lock on aReadMark[0]. But
-# as it is obtaining the lock, [db2] appends to the log file.
-#
-T filter xShmLock
-T script lock_callback
-proc lock_callback {method file handle spec} {
-  if {$spec == "3 1 lock shared"} {
-    # This is the callback for [db] to obtain the read lock on aReadMark[0].
-    # Disable future callbacks using [T filter {}] and write to the log
-    # file using [db2]. [db3] is preventing [db2] from wrapping the log
-    # here, so this is an append.
-    T filter {}
-    db2 eval { INSERT INTO t1 VALUES('f', 's') }
-  }
-  return SQLITE_OK
-}
-do_test wal3-6.1.4 {
-  execsql {
-    BEGIN;
-    SELECT * FROM t1;
-  }
-} {o t t f f s}
-
-# [db] should be left holding a read-lock on some slot other than 
-# aReadMark[0]. Test this by demonstrating that the read-lock is preventing
-# the log from being wrapped.
-#
-do_test wal3-6.1.5 {
-  db3 eval COMMIT
-  db2 eval { PRAGMA wal_checkpoint }
-  set sz1 [file size test.db-wal]
-  db2 eval { INSERT INTO t1 VALUES('s', 'e') }
-  set sz2 [file size test.db-wal]
-  expr {$sz2>$sz1}
-} {1}
-
-# Test that if [db2] had not interfered when [db] was trying to grab
-# aReadMark[0], it would have been possible to wrap the log in 3.6.1.5.
-#
-do_test wal3-6.1.6 {
-  execsql { COMMIT }
-  execsql { PRAGMA wal_checkpoint } db2
-  execsql {
-    BEGIN;
-    SELECT * FROM t1;
-  }
-} {o t t f f s s e}
-do_test wal3-6.1.7 {
-  db2 eval { PRAGMA wal_checkpoint }
-  set sz1 [file size test.db-wal]
-  db2 eval { INSERT INTO t1 VALUES('n', 't') }
-  set sz2 [file size test.db-wal]
-  expr {$sz2==$sz1}
-} {1}
-
-db3 close
-db2 close
-db close
-
-do_test wal3-6.2.1 {
-  forcedelete test.db test.db-journal test.db wal
-  sqlite3 db test.db
-  sqlite3 db2 test.db
-  execsql { PRAGMA auto_vacuum = off }
-  execsql { PRAGMA journal_mode = WAL }
-  execsql {
-    CREATE TABLE t1(a, b);
-    INSERT INTO t1 VALUES('h', 'h');
-    INSERT INTO t1 VALUES('l', 'b');
-  }
-} {}
-
-T filter xShmLock
-T script lock_callback
-proc lock_callback {method file handle spec} {
-  if {$spec == "3 1 unlock exclusive"} {
-    T filter {}
-    set ::R [db2 eval {
-      BEGIN;
-      SELECT * FROM t1;
-    }]
-  }
-}
-do_test wal3-6.2.2 {
-  execsql { PRAGMA wal_checkpoint }
-} {0 4 4}
-do_test wal3-6.2.3 {
-  set ::R
-} {h h l b}
-do_test wal3-6.2.4 {
-  set sz1 [file size test.db-wal]
-  execsql { INSERT INTO t1 VALUES('b', 'c'); }
-  set sz2 [file size test.db-wal]
-  expr {$sz2 > $sz1}
-} {1}
-do_test wal3-6.2.5 {
-  db2 eval { COMMIT }
-  execsql { PRAGMA wal_checkpoint }
-  set sz1 [file size test.db-wal]
-  execsql { INSERT INTO t1 VALUES('n', 'o'); }
-  set sz2 [file size test.db-wal]
-  expr {$sz2 == $sz1}
-} {1}
- 
-db2 close
-db close
-T delete
-
-#-------------------------------------------------------------------------
-# When opening a read-transaction on a database, if the entire log has
-# not yet been copied to the database file, the reader grabs a read
-# lock on aReadMark[x], where x>0. The following test cases experiment
-# with the outcome of the following:
-#
-#   + The reader discovering that between the time when it read the
-#     wal-index header and the lock was obtained that a writer has 
-#     written to the log. In this case the reader should re-read the 
-#     wal-index header and lock a snapshot corresponding to the new 
-#     header.
-#
-#   + The value in the aReadMark[x] slot has been modified since it was
-#     read.
-#
-catch {db close}
-testvfs T -default 1
-do_test wal3-7.1.1 {
-  forcedelete test.db test.db-journal test.db wal
-  sqlite3 db test.db
-  execsql {
-    PRAGMA journal_mode = WAL;
-    CREATE TABLE blue(red PRIMARY KEY, green);
-  }
-} {wal}
-
-T script method_callback
-T filter xOpen
-proc method_callback {method args} {
-  if {$method == "xOpen"} { return "reader" }
-}
-do_test wal3-7.1.2 {
-  sqlite3 db2 test.db
-  execsql { SELECT * FROM blue } db2
-} {}
-
-T filter xShmLock
-set ::locks [list]
-proc method_callback {method file handle spec} {
-  if {$handle != "reader" } { return }
-  if {$method == "xShmLock"} {
-    catch { execsql { INSERT INTO blue VALUES(1, 2) } }
-    catch { execsql { INSERT INTO blue VALUES(3, 4) } }
-  }
-  lappend ::locks $spec
-}
-do_test wal3-7.1.3 {
-  execsql { SELECT * FROM blue } db2
-} {1 2 3 4}
-do_test wal3-7.1.4 {
-  set ::locks
-} {{4 1 lock shared} {4 1 unlock shared} {5 1 lock shared} {5 1 unlock shared}}
-
-set ::locks [list]
-proc method_callback {method file handle spec} {
-  if {$handle != "reader" } { return }
-  if {$method == "xShmLock"} {
-    catch { execsql { INSERT INTO blue VALUES(5, 6) } }
-  }
-  lappend ::locks $spec
-}
-do_test wal3-7.2.1 {
-  execsql { SELECT * FROM blue } db2
-} {1 2 3 4 5 6}
-do_test wal3-7.2.2 {
-  set ::locks
-} {{5 1 lock shared} {5 1 unlock shared} {4 1 lock shared} {4 1 unlock shared}}
-
-db close
-db2 close
-T delete
-
-#-------------------------------------------------------------------------
-# 
-do_test wal3-8.1 {
-  forcedelete test.db test.db-journal test.db wal
-  sqlite3 db test.db
-  sqlite3 db2 test.db
-  execsql {
-    PRAGMA auto_vacuum = off;
-    PRAGMA journal_mode = WAL;
-    CREATE TABLE b(c);
-    INSERT INTO b VALUES('Tehran');
-    INSERT INTO b VALUES('Qom');
-    INSERT INTO b VALUES('Markazi');
-    PRAGMA wal_checkpoint;
-  }
-} {wal 0 5 5}
-do_test wal3-8.2 {
-  execsql { SELECT * FROM b }
-} {Tehran Qom Markazi}
-do_test wal3-8.3 {
-  db eval { SELECT * FROM b } {
-    db eval { INSERT INTO b VALUES('Qazvin') }
-    set r [db2 eval { SELECT * FROM b }]
-    break
-  }
-  set r
-} {Tehran Qom Markazi Qazvin}
-do_test wal3-8.4 {
-  execsql {
-    INSERT INTO b VALUES('Gilan');
-    INSERT INTO b VALUES('Ardabil');
-  }
-} {}
-db2 close
-
-faultsim_save_and_close
-testvfs T -default 1
-faultsim_restore_and_reopen
-T filter xShmLock
-T script lock_callback
-
-proc lock_callback {method file handle spec} {
-  if {$spec == "1 7 unlock exclusive"} {
-    T filter {}
-    set ::r [catchsql { SELECT * FROM b } db2]
-  }
-}
-sqlite3 db test.db
-sqlite3 db2 test.db
-do_test wal3-8.5 {
-  execsql { SELECT * FROM b }
-} {Tehran Qom Markazi Qazvin Gilan Ardabil}
-do_test wal3-8.6 {
-  set ::r
-} {1 {locking protocol}}
-
-db close
-db2 close
-
-faultsim_restore_and_reopen
-sqlite3 db2 test.db
-T filter xShmLock
-T script lock_callback
-proc lock_callback {method file handle spec} {
-  if {$spec == "1 7 unlock exclusive"} {
-    T filter {}
-    set ::r [catchsql { SELECT * FROM b } db2]
-  }
-}
-unset ::r
-do_test wal3-8.5 {
-  execsql { SELECT * FROM b }
-} {Tehran Qom Markazi Qazvin Gilan Ardabil}
-do_test wal3-8.6 {
-  set ::r
-} {1 {locking protocol}}
-
-db close
-db2 close
-T delete
-
-#-------------------------------------------------------------------------
-# When a connection opens a read-lock on the database, it searches for
-# an aReadMark[] slot that is already set to the mxFrame value for the
-# new transaction. If it cannot find one, it attempts to obtain an 
-# exclusive lock on an aReadMark[] slot for the purposes of modifying
-# the value, then drops back to a shared-lock for the duration of the
-# transaction.
-#
-# This test case verifies that if an exclusive lock cannot be obtained
-# on any aReadMark[] slot (because there are already several readers),
-# the client takes a shared-lock on a slot without modifying the value
-# and continues.
-#
-set nConn 50
-if { [string match *BSD $tcl_platform(os)] } { set nConn 25 }
-do_test wal3-9.0 {
-  forcedelete test.db test.db-journal test.db wal
-  sqlite3 db test.db
-  execsql {
-    PRAGMA page_size = 1024;
-    PRAGMA journal_mode = WAL;
-    CREATE TABLE whoami(x);
-    INSERT INTO whoami VALUES('nobody');
-  }
-} {wal}
-for {set i 0} {$i < $nConn} {incr i} {
-  set c db$i
-  do_test wal3-9.1.$i {
-    sqlite3 $c test.db
-    execsql { UPDATE whoami SET x = $c }
-    execsql {
-      BEGIN;
-      SELECT * FROM whoami
-    } $c
-  } $c
-}
-for {set i 0} {$i < $nConn} {incr i} {
-  set c db$i
-  do_test wal3-9.2.$i {
-    execsql { SELECT * FROM whoami } $c
-  } $c
-}
-
-set sz [expr 1024 * (2+$AUTOVACUUM)]
-do_test wal3-9.3 {
-  for {set i 0} {$i < ($nConn-1)} {incr i} { db$i close }
-  execsql { PRAGMA wal_checkpoint } 
-  byte_is_zero test.db [expr $sz-1024]
-} {1}
-do_test wal3-9.4 {
-  db[expr $nConn-1] close
-  execsql { PRAGMA wal_checkpoint } 
-  set sz2 [file size test.db]
-  byte_is_zero test.db [expr $sz-1024]
-} {0}
-
-do_multiclient_test tn {
-  do_test wal3-10.$tn.1 {
-    sql1 {
-      PRAGMA page_size = 1024;
-      CREATE TABLE t1(x);
-      PRAGMA journal_mode = WAL;
-      PRAGMA wal_autocheckpoint = 100000;
-      BEGIN;
-        INSERT INTO t1 VALUES(randomblob(800));
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 2
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 4
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 8
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 16
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 32
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 64
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 128
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 256
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 512
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 1024
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 2048
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 4096
-        INSERT INTO t1 SELECT randomblob(800) FROM t1;   -- 8192
-      COMMIT;
-      CREATE INDEX i1 ON t1(x);
-    }
-
-    expr {[file size test.db-wal] > [expr 1032*9000]}
-  } 1
-
-  do_test wal3-10.$tn.2 {
-    sql2 {PRAGMA integrity_check}
-  } {ok}
-}
-
-finish_test