Re: Re: Reentrant Functions
- To: mathgroup at smc.vnet.net
- Subject: [mg29473] Re: [mg29450] Re: Reentrant Functions
- From: "Hermann Schmitt" <schmitther at netcologne.de>
- Date: Thu, 21 Jun 2001 01:56:48 -0400 (EDT)
- References: <9gn6oo$eof$1@smc.vnet.net> <200106200836.EAA17681@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hello, I think, I mean with "reentant" that, what you mean with "recursive", perhaps my meaning is wrong. What manual do you mean? I think I have now overcome my problems with reentrant i.e. recursive functions. Hermann Schmitt ----- Original Message ----- From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de> To: mathgroup at smc.vnet.net Subject: [mg29473] [mg29450] Re: Reentrant Functions > Hi, > > a) functions must reentrant in a multi-thread application > with more than one program thread. A C-function with > some static local data is not, a C-function that access > some global data is not. Mathematica has not support > for threads (it has MathLink). So you can't make reentrant > functions because you can only access a single thread. > The reentrance problem arises when the same function is > called from two different program > threads at the same time (this is not recursive) and > this cause trouble with the access of the static data. > The same applys to functions that access a certain hardware > port directly. > > b) if you mean *recursive* functions, yes Mathematica's function > can be recursive. However recursion has nothing to do > with reentrance, because a recursive function can be non-reentrant > (a factorial that save the first 30 computed values in a static > table) > c) you should found out *what* you mean. > d) the manual has a complete description of recursive > programing -- why not read this book ? > > Regards > Jens > > > Hermann Schmitt wrote: > > > > Hello, > > can functions be made reentrant, i.e. can I invoke in a function the > > same function again? > > Hermann Schmitt >
- References:
- Re: Reentrant Functions
- From: Jens-Peer Kuska <kuska@informatik.uni-leipzig.de>
- Re: Reentrant Functions