[omniORB] Recursive mutex class for omnithreads

[Alex Tingle]

Hi Peter,

There already is an omni recursive mutex, it's just not exported as part of the generic omnithread library.

Look in: include/omniORB4/internal/rmutex.h & src/lib/omniORB/orbcore/rmutex.cc

-Alex

--

On Tue, 28 Jun 2005 07:26:22 -0700
"Peter S. Housel" <housel at acm.org> wrote:

> It would be nice if omnithreads provided a recursive mutex class.  The
> following is a portable implementation of recursive mutexes in terms of
> the other omnithreads primitives.
> 
> class omni_recursive_mutex {
>     omni_mutex nesting_mutex_;
>     omni_condition cond_;
>     volatile unsigned level_;
>     volatile omni_thread *thread_;
> public:
>     omni_recursive_mutex()
> 	: cond_(&nesting_mutex_), level_(0), thread_(0) {
>     }
>     void lock() {
> 	nesting_mutex_.lock();
> 	if(level_ == 0) {
> 	    thread_ = omni_thread::self();
> 	} else if(thread_ != omni_thread::self()) {
> 	    while(level_ > 0)
> 		cond_.wait();
> 	    thread_ = omni_thread::self();
> 	}
> 	++level_;
> 	nesting_mutex_.unlock();
>     }
>     void unlock() {
> 	nesting_mutex_.lock();
> 	if(--level_ == 0) {
> 	    thread_ = 0;
> 	    cond_.signal();
> 	}
> 	nesting_mutex_.unlock();
>     }
> };
> 
> -- 
> Peter S. Housel <housel at acm.org>
> 
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-- 
:: alex tingle
:: http://www.firetree.net/consulting/
:: alex.tingle AT firetree.net  +44-7901-552763