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diff --git a/third_party/sqlite/test/async4.test b/third_party/sqlite/test/async4.test
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+# 2009 April 25
+#
+# 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.
+#
+#***********************************************************************
+#
+# $Id: async4.test,v 1.4 2009/06/05 17:09:12 drh Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# These tests only work for Tcl version 8.5 and later on Windows (for now)
+#
+if {$tcl_platform(platform)=="windows"} {
+  scan $::tcl_version %f vx
+  if {$vx<8.5} {
+    finish_test
+    return
+  }
+}
+
+if {[info commands sqlite3async_initialize] eq ""} {
+  # The async logic is not built into this system
+  finish_test
+  return
+}
+db close
+
+# Test layout:
+#
+#   async4.1.*: Test the lockfiles parameter.
+#   async4.2.*: Test the delay parameter.
+
+do_test async4.1.1 {
+  sqlite3async_initialize {} 0
+  sqlite3async_control lockfiles
+} {1}
+do_test async4.1.2 {
+  sqlite3async_control lockfiles false
+} {0}
+do_test async4.1.3 {
+  sqlite3async_control lockfiles
+} {0}
+do_test async4.1.4 {
+  sqlite3async_control lockfiles true
+} {1}
+
+do_test async4.1.5 {
+  sqlite3 db test.db -vfs sqlite3async
+  execsql { CREATE TABLE t1(a, b, c) }
+} {}
+do_test async4.1.6 {
+  list [file exists test.db] [file size test.db]
+} {1 0}
+do_test async4.1.7 {
+  sqlite3 db2 test.db
+  catchsql { CREATE TABLE t2(a, b, c) } db2
+} {1 {database is locked}}
+do_test async4.1.8 {
+  sqlite3async_control halt idle
+  sqlite3async_start
+  sqlite3async_wait
+} {}
+do_test async4.1.9 {
+  catchsql { CREATE TABLE t2(a, b, c) } db2
+} {0 {}}
+do_test async4.1.10 {
+  list [catch {sqlite3async_control lockfiles false} msg] $msg
+} {1 SQLITE_MISUSE}
+do_test async4.1.11 {
+  db close
+  list [catch {sqlite3async_control lockfiles false} msg] $msg
+} {1 SQLITE_MISUSE}
+do_test async4.1.12 {
+  sqlite3async_start
+  sqlite3async_wait
+  sqlite3async_control lockfiles false
+} {0}
+do_test async4.1.13 {
+  sqlite3 db test.db -vfs sqlite3async
+  execsql { CREATE TABLE t3(a, b, c) } db
+} {}
+do_test async4.1.14 {
+  execsql { 
+    CREATE INDEX i1 ON t2(a);
+    CREATE INDEX i2 ON t1(a);
+  } db2
+} {}
+do_test async4.1.15 {
+  sqlite3async_start
+  sqlite3async_wait
+  execsql { pragma integrity_check } db2
+} {{*** in database main ***
+Page 5 is never used}}
+do_test async4.1.16 {
+  db close
+  db2 close
+  sqlite3async_start
+  sqlite3async_wait
+} {}
+do_test async4.1.17 {
+  sqlite3async_control lockfiles true
+} {1}
+
+do_test async4.2.1 {
+  sqlite3async_control delay
+} {0}
+do_test async4.2.2 {
+  sqlite3async_control delay 23
+} {23}
+do_test async4.2.3 {
+  sqlite3async_control delay
+} {23}
+do_test async4.2.4 {
+  sqlite3async_control delay 0
+} {0}
+do_test async4.2.5 {
+  sqlite3 db test.db -vfs sqlite3async
+
+  execsql { CREATE TABLE t4(a, b) }
+  set T1 [lindex [time {
+    sqlite3async_start
+    sqlite3async_wait
+  }] 0]
+
+  sqlite3async_control delay 100
+  execsql { CREATE TABLE t5(a, b) }
+  set T2 [lindex [time {
+    sqlite3async_start
+    sqlite3async_wait
+  }] 0]
+
+  expr {($T1+1000000) < $T2}
+} {1}
+
+do_test async4.2.6 {
+  sqlite3async_control delay 0
+  execsql { CREATE TABLE t6(a, b) }
+  set T1 [lindex [time {
+    sqlite3async_start
+    sqlite3async_wait
+  }] 0]
+
+  expr {($T1+1000000) < $T2}
+} {1}
+
+do_test async4.2.7 {
+  list [catch { sqlite3async_control delay -1 } msg] $msg
+} {1 SQLITE_MISUSE}
+
+do_test async4.2.8 {
+  db close
+  sqlite3async_start
+  sqlite3async_wait
+} {}
+
+finish_test