how to implement per-thread timer in a multi-thread program?

Re: how to implement per-thread timer in a multi-thread program?

In article <8f9c23f5-dee6-4786-a94e-fc8c38a1487b@h1 7g2000prg.googl egroups.com>,
liu yang <liudows2@gmail .comwrote:Off topic. Not portable. Cant discuss it here. Blah, blah, blah.

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Re: how to implement per-thread timer in a multi-thread program?

On 28 Jul, 07:56, liu yang <liudo...@gmail .comwrote:
comp.lang.c is for the discussion of standard C (as defined by the ISO
standard). Consequently it does not discuss timers or threads. You
ned to look in a thread or platform (OS) specific group for more
information.

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Nick Keighley

Re: how to implement per-thread timer in a multi-thread program?

liu yang <liudows2@gmail .comwrites:Try a Linux newsgroup or comp.programmin g.threads.

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Keith Thompson (The_Other_Keit h) kst-u@mib.org <http://www.ghoti.net/~kst>
Nokia
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Re: how to implement per-thread timer in a multi-thread program?

On 28 Jul 2008 at 6:56, liu yang wrote:Unfortunately, there is no way to get POSIX alarms to signal a calling
thread specifically. So you'll need to do some manual coding around it.

You can set up a thread to deal with the alarms. It blocks all signals
except that it sets up a handler for SIGALRM, then enters a sigwait()
loop.

When another thread wants to receive that alarm, it sets up a handler
for SIGUSR1 (say), and calls a function you provide that registers that
thread with your waiting thread.

When the process is sent a SIGALRM, the waiting thread returns from
sigwait(), works out which thread it should send the alarm to, and sends
a SIGUSR1 to that thread.

Of course you need to be quite careful to keep track of which thread
asked for an alarm at what time, and reset the alarm when necessary.