recursive mutexes - comp.programming.threads

Message from discussion recursive mutexes

red floyd

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More options Jul 15 2004, 4:54 pm

Newsgroups: comp.programming.threads, comp.unix.programmer

From: red floyd <no.s...@here.dude>

Date: Thu, 15 Jul 2004 20:54:56 GMT

Local: Thurs, Jul 15 2004 4:54 pm

Subject: Re: recursive mutexes

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Casper H.S. Dik wrote:
> red floyd <no.s...@here.dude> writes:

>>Does POSIX define what happens when a pthread currently holding a mutex
>>locks the same mutex?

>>i.e.

>>void f()
>>{
>> pthread_mutex_lock(&some_mutex);
>> pthread_mutex_lock(&some_mutex);
>>}

>>The Linux (MDK9.1) implementation of pthreads has a non-portable mutex
>>attribute letting you specify what behavior you want in said situation.

>>I'd like to try to write portable code, though.

> Portable:

> pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);

> Casper

OK, thanks Joe and Casper. I guess my systems implementation is older,
and thus the recursive mutex hadn't yet been standardized or something.
So I'll simply #define something like this

#ifdef USE_NON_PORTABLE_RECURSIVE_MUTEX_
#define RECURSIVE_MUTEX_ATTR PTHREAD_MUTEX_RECURSIVE_NP /* MDK9.1 */
#else
#define RECURSIVE_MUTEX_ATTR PTHREAD_MUTEX_RECURSIVE /* other */
#endif

and use RECURSIVE_MUTEX_ATTR, so that I don't have to worry about it in
the future.

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