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  • Committer: Package Import Robot
  • Author(s): Marc Deslauriers
  • Date: 2015-07-21 07:09:29 UTC
  • mto: This revision was merged to the branch mainline in revision 14.
  • Revision ID: package-import@ubuntu.com-20150721070929-mg4dpqkgg3it1ajf
Tags: upstream-5.6.25
Import upstream version 5.6.25

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sql/lock.cc
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/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
 
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/* Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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#include "sql_acl.h"                       // SUPER_ACL
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#include <hash.h>
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#include <assert.h>
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#include "my_atomic.h"
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/**
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  @defgroup Locking Locking
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  @{
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  DBUG_VOID_RETURN;
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}
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volatile int32 Global_read_lock::m_active_requests;
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/****************************************************************************
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  Handling of global read locks
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                                                 MDL_SHARED));
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    mdl_request.init(MDL_key::GLOBAL, "", "", MDL_SHARED, MDL_EXPLICIT);
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    /* Increment static variable first to signal innodb memcached server
 
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       to release mdl locks held by it */
 
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    my_atomic_add32(&Global_read_lock::m_active_requests, 1);
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    if (thd->mdl_context.acquire_lock(&mdl_request,
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                                      thd->variables.lock_wait_timeout))
 
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    {
 
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      my_atomic_add32(&Global_read_lock::m_active_requests, -1);
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      DBUG_RETURN(1);
 
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    }
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    m_mdl_global_shared_lock= mdl_request.ticket;
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    m_state= GRL_ACQUIRED;
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    m_mdl_blocks_commits_lock= NULL;
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  }
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  thd->mdl_context.release_lock(m_mdl_global_shared_lock);
 
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  my_atomic_add32(&Global_read_lock::m_active_requests, -1);
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  m_mdl_global_shared_lock= NULL;
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  m_state= GRL_NONE;
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  DBUG_VOID_RETURN;
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}
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