Using Sleep() while using timers through setitimer
I am using a timer in my C++ code through setitimer function from sys/time.h. This maps the SIGALRM signal to my timer handler method. After this I am not able to use sleep function. I am assuming it is because sleep uses SIGALRM signal as well. Can you sugg开发者_运维知识库est any workaround for this problem?
Thanks for replying.
From the alarm(2)
man page:
sleep()
may be implemented usingSIGALRM
; mixing calls toalarm()
andsleep()
is a bad idea.
Some implementations don't use SIGALRM
, find a machine like that and you're set. Otherwise, you can try nanosleep()
; it's implemented safely. From the nanosleep(2)
man page:
Compared to
sleep(3)
andusleep(3)
,nanosleep()
has the advantage of not affecting any signals, it is standardized by POSIX, it provides higher timing resolution, and it allows to continue a sleep that has been interrupted by a signal more easily.
You can try using select() just as a timer. I don't know if it uses SIGALRM or not but it should be simple to test. Something like:
timeval t = {1, 0};
select(0, NULL, NULL, NULL, &t);
I'd use a library that gives an abstraction to these OS services. I use ACE library for timers and sleeps (ACE_OS::sleep
, ACE_Reactor::schedule_timeout
) and they work together without any problems. As far as I know ACE uses select
for its timers. I guess boost::thread::sleep and boost::asio::deadline_timer will accomplish the task successfully as well.
精彩评论