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47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
#ifndef VERS_UTILS_INCLUDED
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#define VERS_UTILS_INCLUDED
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#include "table.h"
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#include "sql_class.h"
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#include "vers_string.h"
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class MDL_auto_lock
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{
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THD *thd;
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TABLE_LIST &table;
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bool error;
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public:
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MDL_auto_lock(THD *_thd, TABLE_LIST &_table) :
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thd(_thd), table(_table)
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{
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DBUG_ASSERT(thd);
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MDL_request protection_request;
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if (thd->global_read_lock.can_acquire_protection())
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{
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error= true;
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return;
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}
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protection_request.init(MDL_key::GLOBAL, "", "", MDL_INTENTION_EXCLUSIVE,
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MDL_EXPLICIT);
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error= thd->mdl_context.acquire_lock(&protection_request, thd->variables.lock_wait_timeout);
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if (error)
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return;
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table.mdl_request.init(MDL_key::TABLE, table.db.str, table.table_name.str, MDL_EXCLUSIVE, MDL_EXPLICIT);
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error= thd->mdl_context.acquire_lock(&table.mdl_request, thd->variables.lock_wait_timeout);
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thd->mdl_context.release_lock(protection_request.ticket);
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}
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~MDL_auto_lock()
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{
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if (!error)
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{
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DBUG_ASSERT(table.mdl_request.ticket);
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thd->mdl_context.release_lock(table.mdl_request.ticket);
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table.mdl_request.ticket= NULL;
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}
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}
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bool acquire_error() const { return error; }
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};
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#endif // VERS_UTILS_INCLUDED
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