Import SQLite 3.8.7.4.

third_party/sqlite/src/test/unixexcl.test

 # 2011 March 30
 #
 # 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.
 #
 #***********************************************************************
@@ skipping 62 matching lines @@
       db close
       sqlite3 db test.db -readonly yes -vfs unix-excl
       db eval { SELECT * FROM t1 }
     }
   } {hello world}
   do_test unixexcl-2.$tn.4 { 
     csql2 { SELECT * FROM t1 } 
   } {0 {hello world}}
 }
 
+do_multiclient_test tn {
+  do_test unixexcl-3.$tn.1 {
+    code1 { db close; sqlite3 db file:test.db?psow=0 -vfs unix-excl -uri 1 }
+    code2 { db2 close; sqlite3 db2 file:test.db?psow=0 -vfs unix-excl -uri 1 }
+    sql1 {
+      PRAGMA auto_vacuum = 0;
+      PRAGMA journal_mode = WAL;
+      CREATE TABLE t1(a, b);
+      INSERT INTO t1 VALUES(1, 2);
+    }
+  } {wal}
+
+  if {$tn==1} {
+    do_test unixexcl-3.$tn.1.multiproc {
+      csql2 { SELECT * FROM t1; }
+    } {1 {database is locked}}
+  } else {
+    do_test unixexcl-3.$tn.1.singleproc {
+      sql2 { SELECT * FROM t1; }
+    } {1 2}
+
+    do_test unixexcl-3.$tn.2 {
+      sql2 { 
+        BEGIN;
+          SELECT * FROM t1;
+      }
+    } {1 2}
+    do_test unixexcl-3.$tn.3 {
+      sql1 { PRAGMA wal_checkpoint; INSERT INTO t1 VALUES(3, 4); }
+    } {0 5 5}
+    do_test unixexcl-3.$tn.4 {
+      sql2 { SELECT * FROM t1; }
+    } {1 2}
+    do_test unixexcl-3.$tn.5 {
+      sql1 { SELECT * FROM t1; }
+    } {1 2 3 4}
+    do_test unixexcl-3.$tn.6 {
+      sql2 { COMMIT; SELECT * FROM t1; }
+    } {1 2 3 4}
+    do_test unixexcl-3.$tn.7 {
+      sql1 { PRAGMA wal_checkpoint; }
+    } {0 7 7}
+  }
+}
+
 finish_test