[Boost-users] Re: You provide gun, I provide foot.

From: C. Michailidis (dinom_at_[hidden])
Date: 2005-04-18 08:31:30

> In any case, the boost libs still rock!  Maybe I'll dig a little deeper and 
> make a proposal; after April 15th of course!

After investigating various ways to solve my difficulties from previous posts (see http://lists.boost.org/boost-users/2005/04/11119.php and http://lists.boost.org/boost-users/2005/04/11120.php), I've settled on the following solution.

I believe the changes contained in the following patch (to http://www.boost.org/libs/thread/example/recursive_mutex.cpp) enable more traditional/procedural mutex operation (i.e. un-scoped locks).  I think my COM component is saved!

diff -u recursive_mutex.cpp recursive_mutex_key.cpp
--- recursive_mutex.cpp Mon Apr 18 08:52:07 2005
+++ recursive_mutex_key.cpp     Mon Apr 18 09:03:03 2005
@@ -13,19 +13,27 @@
 #include <boost/thread/thread.hpp>
 #include <iostream>

+#define recursive_mutex_key boost::detail::thread::lock_ops<boost::recursive_mutex>
+
 class counter
 {
 public:
     counter() : count(0) { }

     int add(int val) {
-        boost::recursive_mutex::scoped_lock scoped_lock(mutex);
+        int retval;
+        recursive_mutex_key::lock(mutex);
         count += val;
-        return count;
+        retval = count;
+        recursive_mutex_key::unlock(mutex);
+        return retval;
     }
     int increment() {
-        boost::recursive_mutex::scoped_lock scoped_lock(mutex);
-        return add(1);
+        int retval;
+        recursive_mutex_key::lock(mutex);
+        retval = add(1);
+        recursive_mutex_key::unlock(mutex);
+        return retval;
     }

 private:

Feedback greatly appreciated,
Dino

P.S. Taxes all done, ya!