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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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drizzled/function/math/acos.h
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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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#ifndef PLUGIN_MATH_FUNCTIONS_ACOS_H
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#define PLUGIN_MATH_FUNCTIONS_ACOS_H
 
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#ifndef DRIZZLED_FUNCTION_MATH_ACOS_H
 
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#define DRIZZLED_FUNCTION_MATH_ACOS_H
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#include <drizzled/function/func.h>
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#include <drizzled/function/math/dec.h>
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class Item_func_acos :public Item_dec_func
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{
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public:
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  Item_func_acos() :Item_dec_func() {}
 
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  Item_func_acos(Item *a) :Item_dec_func(a) {}
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  double val_real();
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  const char *func_name() const { return "acos"; }
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  bool check_argument_count(int n) { return n == 1; }
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};
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} /* namespace drizzled */
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#endif /* PLUGIN_MATH_FUNCTIONS_ACOS_H */
 
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#endif /* DRIZZLED_FUNCTION_MATH_ACOS_H */