linux-kernel - Re: [PATCH] trace-event-python: give field dict to unhandled callback

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Message-ID: <AANLkTimP7PwL7sRV_FVaa57JhWZ9wHJBYRnnbXPdj-ls@mail.gmail.com>
Date:	Mon, 31 May 2010 23:07:38 +0200
From:	Pierre Tardy <tardyp@...il.com>
To:	Tom Zanussi <tzanussi@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] trace-event-python: give field dict to unhandled callback

> The if statement expands to:
>
> if (!handler)
>  if ( --(dict)->ob_refcnt != 0) ; else
> ( (*((PyObject*)(dict))->ob_type->tp_dealloc)((PyObject *)((PyObject
> *)(dict))));
>
yeah, in python2.6 at least,  Py_DECREF is protected by do{ } while(0)
#define Py_DECREF(op)                                   \
        do {                                            \
            if (_Py_DEC_REFTOTAL  _Py_REF_DEBUG_COMMA   \
                --((PyObject*)(op))->ob_refcnt != 0)    \
                    _Py_CHECK_REFCNT(op)                \
            else                                        \
                _Py_Dealloc((PyObject *)(op));          \
        } while (0)

>       if (!handler) {
>               Py_DECREF(dict);
>       }

See a simpler fix in my next email.

-- 
Pierre
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