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Full Discussion: multithreading on OSX
Top Forums Programming multithreading on OSX Post 302209383 by eBay on Thursday 26th of June 2008 07:25:05 PM
Old 06-26-2008
OT: A Helpful Class

I've been out of the game for a while with C++ but as I read your post, I was reminded of some classes I wrote to manage multiple threads. Also, Bartosz Milewski of Reliable Software - Creators of the distributed version control system, Code Co-op wrote a really cool critical section class wrapper that totally protects against accidentally leaving a lock in place. His discussion of how resource management is the key to reliable message driven software was well done and he had numerous ways to protect against leaving resources open or laying around that would cause memory leaks or hangs. Here it is:
Code:
// CriticalSection.h
// 
// A class using Resource Management technique(RM: see 
// http://www.relisoft.com/resource/resource.html for
// discussion) to handle critical section code that 
// guarantees no memory leaks or open locks.
//
// Revision Log
//
// Date       Who SAR     Notes
// ========== === ======= =====================================
//                        (c) Reliable Software, 1997, 98
//                        Bartosz Milewski, www.relisoft.com
// 

#ifdef SAMPLE_CODE

   // somewhere with the resource to protect
   CCriticalSection _critSect;

   // later in the code...
   {
      CLock lock(_critSect);
      // perform action which may throw
      myVar += 10;
      // guaranteed automatic destructor of lock
      // when it goes out of scope
   }
}
#endif


#ifndef RFC_CRITICAL_SECTION_H
#define RFC_CRITICAL_SECTION_H

#include <windows.h>

class CCriticalSection
{
   friend class CLock;
public:
   CCriticalSection() { InitializeCriticalSection(&_critSectStruct); }
   ~CCriticalSection() { DeleteCriticalSection(&_critSectStruct); }
private: 
   // these must only be used by CLock object, never directly
   void Enter() { EnterCriticalSection(&_critSectStruct); }
   void Leave() { LeaveCriticalSection(&_critSectStruct); }

   CCriticalSection(CCriticalSection& o); // not allowed
   CCriticalSection& operator=(CCriticalSection& o); // not allowed

   CRITICAL_SECTION _critSectStruct;
};

class CLock 
{
public:
    CLock(CCriticalSection& critSect) 
        : _critSectObj(critSect) 
    {
        _critSectObj.Enter();
    }
    ~CLock()
    {
        _critSectObj.Leave();
    }
private:
    CCriticalSection & _critSectObj;
};

#endif

 

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XtVaGetSubresources()													     XtVaGetSubresources()

Name
  XtVaGetSubresources - fetch resources for widget subparts, using varargs argument style.

Synopsis
  void XtVaGetSubresources(object, base, name, class, resources, num_resources, ..., NULL)
	 Widget object;
	 XtPointer base;
	 String name;
	 String class;
	 XtResourceList resources;
	 Cardinal num_resources;

Inputs
  object    Specifies the object used to qualify the subpart resource name and class; may be of class Object or any subclass thereof.

  base	    Specifies the base address of the subpart data structure into which the resources will be written.

  name	    Specifies the name of the subpart.

  class     Specifies the class of the subpart.

  resources Specifies the resource list for the subpart.

  num_resources
	    Specifies the number of resources in the resource list.

  ..., NULL A NULL-terminated variable-length list of resource name/value pairs to override any other resource specifications.

Availability
  Release 4 and later.

Description
  XtVaGetSubresources()  gets  values  for  each of the resources described in resources from the variable length argument list, the resource
  database, or the default values associated with each resource, and stores these values into the structure pointed to by base.  It is	iden-
  tical  to  XtGetSubresources()  except  that	the  args  array  of resource names and values and the num_args argument of that function are
  replaced with a NULL-terminated variable-length argument list.

  See XtGetSubresources() for more information on this function.  See XtVaSetValues() for more information on using variable-length  argument
  lists to specify resources.  See XtGetApplicationResources() for a description of how to declare an XtResourceList.

See Also
  XtGetApplicationResources(1), XtGetSubresources(1), XtVaSetValues(1).

Xt - Resource Management												     XtVaGetSubresources()
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