7 Jul
2007
7 Jul
'07
8:09 a.m.
On Sat, 2007-07-07 at 12:03 +0200, Arnold Krille wrote:
Am Samstag, 7. Juli 2007 schrieb Lars Luthman:
Seriously now, I'm not _that_ stupid. =)
On Sat, 2007-07-07 at 02:34 +0200, Fons
Adriaensen wrote:
A semaphore might mislead you to use wait()/lock() in the wrong thread... * The callback has to know when it can (re)write
the object.
Clearly it should never wait on a sema, and it is already
periodic, so here you can use a flag in the object.
Is there any advantage in
using a simple flag instead of a semaphore and
sem_trywait()? And if you only sync two threads and each of them has
its own flag (for
write), there shouldn't be any race-conditions and its easier to use a
bool-variable than semaphore->bla().
I guess so. Can you always be sure that writing to word-sized variables
is atomic on SMP systems?
Although if you only check for 0 or not 0 I guess it doesn't matter.
--ll