Fixed compiler warnings.

Fixed timing test failures.
Fixed a failure in the Aria engines page cache and log handler (found with maria.maria-big test)
- This could cause a core dump when deleting big blobs.
- Added test to end_pagecache() to verify that page cache was correctly used.
  - inc_counter_for_resize_op and dec_counter_for_resize_op are called same number of times.
  - All page cache blocks was properly deallocated (empty)


mysql-test/suite/innodb/t/innodb_bug38231.test:
  Fixed timing issue (code comment says it all)
mysql-test/suite/innodb_plugin/t/innodb_bug38231.test:
  Fixed timing issue (code comment says it all)
sql/debug_sync.cc:
  Fixed compiler warning
storage/maria/ma_loghandler.c:
  Fixed bug found by maria.maria-big test:
  - Fixed race condition between update thread logging a very big blog and checkpoint thread.
storage/maria/ma_pagecache.c:
  Added assert to ensure mutex was properly locked.
  Added test to end_pagecache() to verify that page cache was correctly used.
  - inc_counter_for_resize_op and dec_counter_for_resize_op are called same number of times.
  - All page cache blocks was properly deallocated (empty)
  In pagecache_delete_internal(), properly reset counters and pins if functions aborts.
  Added missing inc_counter_for_resize_op() to pagecache_wait_lock().
  Added missing dec_counter_for_resize_op() to pagecache_delete()

mysql-test/suite/innodb/t/innodb_bug38231.test

@@ -76,6 +76,11 @@ UNLOCK TABLES;
 UNLOCK TABLES;
 
 -- connection con3
+#
+# We may get a timeout error here if the tables are locked in a different
+# order than expected. This is ok as the purpose of this patch is to ensure
+# we don't get a crash in the previous unlock tables.
+-- error 0, 1205
 -- reap
 UNLOCK TABLES;
 

mysql-test/suite/innodb_plugin/t/innodb_bug38231.test

@@ -72,8 +72,12 @@ UNLOCK TABLES;
 # clean up
 
 -- connection con2
--- reap
+#
+# We may get a timeout error here if the tables are locked in a different
+# order than expected. This is ok as the purpose of this patch is to ensure
+# we don't get a crash in the previous unlock tables.
 -- error 0, 1205
+-- reap
 UNLOCK TABLES;
 
 -- connection con3

sql/debug_sync.cc

@@ -1719,6 +1719,7 @@ static void debug_sync_execute(THD *thd, st_debug_sync_action *action)
   if (action->execute)
   {
     const char  *old_proc_info;
+    LINT_INIT(old_proc_info);
 
     action->execute--;
 

storage/maria/ma_loghandler.c

-/* Copyright (C) 2007 MySQL AB & Sanja Belkin
+/* Copyright (C) 2007 MySQL AB & Sanja Belkin. 2010 Monty Program Ab.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -2526,10 +2526,9 @@ static my_bool translog_buffer_flush(struct st_translog_buffer *buffer)
   {
     /* some other flush in progress */
     translog_wait_for_closing(buffer);
-  }
-
     if (buffer->file != file || buffer->offset != offset || buffer->ver != ver)
       DBUG_RETURN(0); /* some the thread flushed the buffer already */
+  }
 
   if (buffer->overlay && translog_prev_buffer_flush_wait(buffer))
     DBUG_RETURN(0); /* some the thread flushed the buffer already */
@@ -7648,18 +7647,28 @@ my_bool translog_flush(TRANSLOG_ADDRESS lsn)
     struct st_translog_buffer *buffer= log_descriptor.bc.buffer;
     lsn= log_descriptor.bc.buffer->last_lsn; /* fix lsn if it was horizon */
     DBUG_PRINT("info", ("LSN to flush fixed to last lsn: (%lu,0x%lx)",
-               LSN_IN_PARTS(log_descriptor.bc.buffer->last_lsn)));
+               LSN_IN_PARTS(lsn)));
     last_buffer_no= log_descriptor.bc.buffer_no;
     log_descriptor.is_everything_flushed= 1;
     translog_force_current_buffer_to_finish();
     translog_buffer_unlock(buffer);
   }
-  else
+  else if (log_descriptor.bc.buffer->prev_last_lsn != LSN_IMPOSSIBLE)
   {
+    /* fix lsn if it was horizon */
+    lsn= log_descriptor.bc.buffer->prev_last_lsn;
+    DBUG_PRINT("info", ("LSN to flush fixed to prev last lsn: (%lu,0x%lx)",
+               LSN_IN_PARTS(lsn)));
     last_buffer_no= ((log_descriptor.bc.buffer_no + TRANSLOG_BUFFERS_NO -1) %
                      TRANSLOG_BUFFERS_NO);
     translog_unlock();
   }
+  else if (log_descriptor.bc.buffer->last_lsn == LSN_IMPOSSIBLE)
+  {
+    DBUG_PRINT("info", ("There is no LSNs yet generated => do nothing"));
+    translog_unlock();
+    goto out;
+  }
   sent_to_disk= translog_get_sent_to_disk();
   if (cmp_translog_addr(lsn, sent_to_disk) > 0)
   {

storage/maria/ma_pagecache.c

@@ -1025,6 +1025,7 @@ finish:
 */
 static inline void inc_counter_for_resize_op(PAGECACHE *pagecache)
 {
+  safe_mutex_assert_owner(&pagecache->cache_lock);
   pagecache->cnt_for_resize_op++;
 }
 
@@ -1037,6 +1038,7 @@ static inline void dec_counter_for_resize_op(PAGECACHE *pagecache)
 {
 #ifdef THREAD
   struct st_my_thread_var *last_thread;
+  safe_mutex_assert_owner(&pagecache->cache_lock);
   if (!--pagecache->cnt_for_resize_op &&
       (last_thread= pagecache->resize_queue.last_thread))
   {
@@ -1084,6 +1086,37 @@ void change_pagecache_param(PAGECACHE *pagecache, uint division_limit,
 }
 
 
+/*
+  Check that pagecache was used and cleaned up properly.
+*/
+
+#ifndef DBUG_OFF
+void check_pagecache_is_cleaned_up(PAGECACHE *pagecache)
+{
+  DBUG_ENTER("check_pagecache_is_cleaned_up");
+  /*
+    Ensure we called inc_counter_for_resize_op and dec_counter_for_resize_op
+    the same number of times. (If not, a resize() could never happen.
+  */
+  DBUG_ASSERT(pagecache->cnt_for_resize_op == 0);
+
+  if (pagecache->disk_blocks > 0)
+  {
+    if (pagecache->block_mem)
+    {
+      uint i;
+      for (i=0 ; i < pagecache->blocks_used ; i++)
+      {
+        DBUG_ASSERT(pagecache->block_root[i].status == 0);
+        DBUG_ASSERT(pagecache->block_root[i].type == PAGECACHE_EMPTY_PAGE);
+      }
+    }
+  }
+  DBUG_VOID_RETURN;
+}
+#endif
+
+
 /*
   Removes page cache from memory. Does NOT flush pages to disk.
 
@@ -1106,6 +1139,10 @@ void end_pagecache(PAGECACHE *pagecache, my_bool cleanup)
 
   if (pagecache->disk_blocks > 0)
   {
+#ifndef DBUG_OFF
+    check_pagecache_is_cleaned_up(pagecache);
+#endif
+
     if (pagecache->block_mem)
     {
       my_large_free(pagecache->block_mem, MYF(0));
@@ -2250,6 +2287,7 @@ static my_bool pagecache_wait_lock(PAGECACHE *pagecache,
                                 &pagecache->cache_lock);
   }
   while(thread->next);
+  inc_counter_for_resize_op(pagecache);
 #else
   DBUG_ASSERT(0);
 #endif
@@ -3457,7 +3495,7 @@ static my_bool pagecache_delete_internal(PAGECACHE *pagecache,
   {
     /*
       this call is just 'hint' for the cache to free the page so we will
-      not interferes with flushing process but gust return success
+      not interferes with flushing process but must return success
     */
     goto out;
   }
@@ -3527,8 +3565,17 @@ static my_bool pagecache_delete_internal(PAGECACHE *pagecache,
   page_link->requests--;
   /* See NOTE for pagecache_unlock about registering requests. */
   free_block(pagecache, block);
+  dec_counter_for_resize_op(pagecache);
+  return 0;
 
 out:
+  /* Cache is locked, so we can relese page before freeing it */
+  if (make_lock_and_pin(pagecache, block,
+                        PAGECACHE_LOCK_WRITE_UNLOCK,
+                        PAGECACHE_UNPIN, FALSE))
+    DBUG_ASSERT(0);
+  page_link->requests--;
+  unreg_request(pagecache, block, 1);
   dec_counter_for_resize_op(pagecache);
   return error;
 }
@@ -3695,6 +3742,7 @@ restart:
     if (!page_link)
     {
       DBUG_PRINT("info", ("There is no such page in the cache"));
+      dec_counter_for_resize_op(pagecache);
       pagecache_pthread_mutex_unlock(&pagecache->cache_lock);
       DBUG_RETURN(0);
     }
@@ -3707,6 +3755,7 @@ restart:
                            "reassigned" : "in switch")));
       PCBLOCK_INFO(block);
       page_link->requests--;
+      dec_counter_for_resize_op(pagecache);
       goto end;
     }
     /* See NOTE for pagecache_unlock about registering requests. */