From: Ian Zimmerman <itz@buug.org>
To: caml-list@inria.fr
Subject: Re: [Caml-list] vm threads
Date: 15 Oct 2005 01:52:45 -0400 [thread overview]
Message-ID: <87zmpb9viq.fsf@buug.org> (raw)
In-Reply-To: <20051015.142304.106269859.garrigue@math.nagoya-u.ac.jp>
Ian> Are Ocaml's VM threads preemptive? That is, does the virtual
Ian> machine actually have a timer and give a slice to each thread? Or
Ian> does a thread run until it's blocked?
Jacques> The timer signal is used, so they are preemptive. This is
Jacques> however only true for threads running ocaml code. There is no
Jacques> way to switch thread during C calls, so that all potentially
Jacques> blocking C calls should be manually converted to non-blocking
Jacques> ones (this is already done for the standard library and the
Jacques> Unix module.) This can also create problems when somebody else
Jacques> needs the timer signal (for instance the Graphics module.)
The reason I asked was: when writing a library that uses C extension
code and a global data structure in the C code, can I just use system
thread primitives for synchronization (that would be pthreads since
I am only thinking about Unix type systems at least ATM) and not worry
about VM threads?
>From your post the answer seems to be yes.
--
"It's not true or not." A reality show producer (real quote)
next prev parent reply other threads:[~2005-10-15 5:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-15 4:52 Ian Zimmerman
2005-10-15 5:23 ` [Caml-list] " Jacques Garrigue
2005-10-15 5:52 ` Ian Zimmerman [this message]
2005-10-15 8:46 ` Jacques Garrigue
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