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https://launchpad.net/bugs/586348
fix pthread atomics. operator precedence is important. The unit test now passes.

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plugin/archive/plugin.cc
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  You should have received a copy of the GNU General Public License
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  along with this program; if not, write to the Free Software
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  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
 
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  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
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#include "config.h"
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{
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  archive_engine= new ArchiveEngine();
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  context.registerVariable(new sys_var_bool_ptr("aio", &archive_use_aio));
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  context.add(archive_engine);
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  return false;
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}
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static DRIZZLE_SYSVAR_BOOL(aio, archive_use_aio,
 
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  PLUGIN_VAR_NOCMDOPT,
 
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  "Whether or not to use asynchronous IO.",
 
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  NULL, NULL, true);
 
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static drizzle_sys_var* archive_system_variables[]= {
 
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  DRIZZLE_SYSVAR(aio),
 
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  NULL
 
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};
 
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DRIZZLE_DECLARE_PLUGIN
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{
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  DRIZZLE_VERSION_ID,
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  "Archive storage engine",
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  PLUGIN_LICENSE_GPL,
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  init, /* Plugin Init */
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  NULL,   /* system variables                */
 
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  archive_system_variables,   /* system variables                */
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  NULL                        /* config options                  */
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}
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DRIZZLE_DECLARE_PLUGIN_END;