Initial commit of OpenSPARC T2 architecture model.

[OpenSPARC-T2-SAM] / sam-t2 / devtools / v8plus / share / swig / 1.3.26 / ocaml / director.swg

/* -*- C++ -*- */
/***********************************************************************
* director.swg
*
*     This file contains support for director classes that proxy
*     method calls from C++ to Ocaml extensions.
*
* Modified for Ocaml by : Art Yerkes
* Original Author : Mark Rose (mrose@stm.lbl.gov)
************************************************************************/

#ifdef __cplusplus

#include <string>

namespace Swig {
 /* base class for director exceptions */
 class DirectorException {
   protected:
     std::string swig_msg;
   public:
     DirectorException(const char* msg="") {
     }
     const char *getMessage() const { 
       return swig_msg.c_str(); 
     }
     virtual ~DirectorException() {}
 };

 /* type mismatch in the return value from a python method call */
 class DirectorTypeMismatchException : public Swig::DirectorException {
   public:
     DirectorTypeMismatchException(const char* msg="") {
     }
 };

 /* any python exception that occurs during a director method call */
 class DirectorMethodException : public Swig::DirectorException {};

 /* attempt to call a pure virtual method via a director method */
 class DirectorPureVirtualException : public Swig::DirectorException {};

 /* simple thread abstraction for pthreads on win32 */
#ifdef __THREAD__
#define __PTHREAD__
#if defined(_WIN32) || defined(__WIN32__)
#define pthread_mutex_lock EnterCriticalSection
#define pthread_mutex_unlock LeaveCriticalSection
#define pthread_mutex_t CRITICAL_SECTION
#define MUTEX_INIT(var) CRITICAL_SECTION var
#else
#include <pthread.h>
#define MUTEX_INIT(var) pthread_mutex_t var = PTHREAD_MUTEX_INITIALIZER 
#endif
#endif

 /* director base class */
 class Director {
   private:
     /* pointer to the wrapped ocaml object */
     CAML_VALUE swig_self;
     /* flag indicating whether the object is owned by ocaml or c++ */
     mutable bool swig_disown_flag;
     mutable bool swig_up;

#ifdef __PTHREAD__
     /* locks for sharing the swig_up flag in a threaded environment */
     static pthread_mutex_t swig_mutex_up;
     static bool swig_mutex_active;
     static pthread_t swig_mutex_thread;
#endif

     /* reset the swig_up flag once the routing direction has been determined */
#ifdef __PTHREAD__
     void swig_clear_up() const { 
       swig_up = false; 
       Swig::Director::swig_mutex_active = false;
       pthread_mutex_unlock(&swig_mutex_up);
     }

#else
     void swig_clear_up() const { 
       swig_up = false; 
     }
#endif

   public:
     /* wrap a ocaml object, optionally taking ownership */
     Director(CAML_VALUE self) : swig_self(self), swig_disown_flag(false), swig_up( false ) {
       register_global_root(&swig_self);
     }

     /* discard our reference at destruction */
     virtual ~Director() {
       remove_global_root(&swig_self);
       swig_disown(); 
       // Disown is safe here because we're just divorcing a reference that
       // points to us.  
     }

     /* return a pointer to the wrapped ocaml object */
     CAML_VALUE swig_get_self() const { 
         return swig_self;
     }

     /* get the swig_up flag to determine if the method call should be routed
      * to the c++ base class or through the wrapped ocaml object
      */
#ifdef __PTHREAD__
     bool swig_get_up( bool clear = true ) const { 
       if (Swig::Director::swig_mutex_active) {
         if (pthread_equal(Swig::Director::swig_mutex_thread, pthread_self())) {
           bool up = swig_up;
           if( clear ) swig_clear_up();
           return up;
         }
       }
       return false;
     }

#else 
     bool swig_get_up( bool clear = true ) const { 
       bool up = swig_up;
       if( clear ) swig_up = false;
       return up;
     }
#endif

     /* set the swig_up flag if the next method call should be directed to
      * the c++ base class rather than the wrapped ocaml object
      */
#ifdef __PTHREAD__
     void swig_set_up() const { 
       pthread_mutex_lock(&Swig::Director::swig_mutex_up);
       Swig::Director::swig_mutex_thread = pthread_self();
       Swig::Director::swig_mutex_active = true;
       swig_up = true; 
     }
#else 
     void swig_set_up() const { 
       swig_up = true; 
     }
#endif

     /* acquire ownership of the wrapped ocaml object (the sense of "disown"
      * is from ocaml) */
     void swig_disown() const { 
       if (!swig_disown_flag) { 
         swig_disown_flag=true;
         callback(*caml_named_value("caml_obj_disown"),swig_self);
       } 
     }
 };

#ifdef __PTHREAD__
 MUTEX_INIT(Swig::Director::swig_mutex_up);
 pthread_t Swig::Director::swig_mutex_thread;
 bool Swig::Director::swig_mutex_active = false;
#endif

}

#endif /* __cplusplus */