Re: [alsa-devel] [PATCH V4 1/5] The macro spin_event_timeout() takes a condition and timeout value

On Tue, May 26, 2009 at 2:29 AM, Geert Uytterhoeven Geert.Uytterhoeven@sonycom.com wrote:

static inline function, returning rc, instead of a macro?

It won't work as an inline function ...

...

• unsigned long __loops = tb_ticks_per_usec * timeout;                \
• unsigned long __start = get_tbl();                                  \
• while ((rc = (condition)) && (tb_ticks_since(__start) <= __loops)) \

There's no way to pass a expression to an inline function. It has to be a macro. Here, the loop evaluates "condition" at every pass. If this were an inline function, "condition" would be evaluated once when the function were called, and never again.