From: krishna <krishna.c@globaledgesoft.com>
To: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Significance of do ... while (0)
Date: Fri, 17 Dec 2004 09:39:00 +0530 [thread overview]
Message-ID: <41C25BDC.8080404@globaledgesoft.com> (raw)
Hi all,
Can any one explain the importance of do ... while (0)
Regards,
Krishna Chaitanya
#define STATS_SET_HIGH(x) do { if ((x)->num_active > (x)->high_mark) \
(x)->high_mark = (x)->num_active; \
} while (0)
#define STATS_INC_ERR(x) ((x)->errors++)
#define STATS_SET_FREEABLE(x, i) \
do { if ((x)->max_freeable < i) \
(x)->max_freeable = i; \
} while (0)
#define STATS_INC_ALLOCHIT(x) atomic_inc(&(x)->allochit)
#define STATS_INC_ALLOCMISS(x) atomic_inc(&(x)->allocmiss)
#define STATS_INC_FREEHIT(x) atomic_inc(&(x)->freehit)
#define STATS_INC_FREEMISS(x) atomic_inc(&(x)->freemiss)
#else
#define STATS_INC_ACTIVE(x) do { } while (0)
#define STATS_DEC_ACTIVE(x) do { } while (0)
#define STATS_INC_ALLOCED(x) do { } while (0)
#define STATS_INC_GROWN(x) do { } while (0)
#define STATS_INC_REAPED(x) do { } while (0)
#define STATS_SET_HIGH(x) do { } while (0)
#define STATS_INC_ERR(x) do { } while (0)
#define STATS_SET_FREEABLE(x, i) \
do { } while (0)
#define STATS_INC_ALLOCHIT(x) do { } while (0)
#define STATS_INC_ALLOCMISS(x) do { } while (0)
#define STATS_INC_FREEHIT(x) do { } while (0)
#define STATS_INC_FREEMISS(x) do { } while (0)
next reply other threads:[~2004-12-17 4:13 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-17 4:09 krishna [this message]
2004-12-17 4:21 ` Significance of do ... while (0) Dave Jones
2004-12-17 4:54 ` krishna
2004-12-17 4:29 ` Mitchell Blank Jr
2004-12-17 7:44 ` Jan Engelhardt
2004-12-17 7:58 ` vlobanov
2004-12-17 8:06 ` Jan Engelhardt
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