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// $Id$
// FILENAME
// Malloc_Allocator.cpp
//
// AUTHOR
// Priyanka Gontla <pgontla@uci.edu>
//
// ==========================================================================
#if !defined (ACE_MALLOC_ALLOCATOR_CPP)
#define ACE_MALLOC_ALLOCATOR_CPP
#include "ace/Malloc_Allocator.h"
#include "ace/Object_Manager.h"
#if !defined (__ACE_INLINE__)
#include "ace/Malloc_Allocator.i"
#endif /* __ACE_INLINE__ */
#include "ace/Synch_T.h"
ACE_RCSID (ace, Malloc_Allocator, "$Id$")
ACE_Allocator *
ACE_Allocator::instance (void)
{
// ACE_TRACE ("ACE_Allocator::instance");
if (ACE_Allocator::allocator_ == 0)
{
// Perform Double-Checked Locking Optimization.
ACE_MT (ACE_GUARD_RETURN (ACE_Recursive_Thread_Mutex, ace_mon,
*ACE_Static_Object_Lock::instance (), 0));
if (ACE_Allocator::allocator_ == 0)
{
// Have a seat. We want to avoid ever having to delete the
// ACE_Allocator instance, to avoid shutdown order
// dependencies. ACE_New_Allocator never needs to be
// destroyed: its destructor is empty and its instance
// doesn't have any state. Therefore, sizeof
// ACE_New_Allocator is equal to sizeof void *. It's
// instance just contains a pointer to its virtual function
// table.
//
// So, we allocate space for the ACE_New_Allocator instance
// in the data segment. Because its size is the same as
// that of a pointer, we allocate it as a pointer so that it
// doesn't get constructed statically. We never bother to
// destroy it.
static void *allocator_instance = 0;
// Check this critical assumption. We put it in a variable
// first to avoid stupid compiler warnings that the
// condition may always be true/false.
# if !defined (ACE_NDEBUG)
int assertion = (sizeof allocator_instance ==
sizeof (ACE_New_Allocator));
ACE_ASSERT (assertion);
# endif /* !ACE_NDEBUG */
// Initialize the allocator_instance by using a placement
// new.
ACE_Allocator::allocator_ =
new (&allocator_instance) ACE_New_Allocator;
}
}
return ACE_Allocator::allocator_;
}
ACE_Allocator *
ACE_Allocator::instance (ACE_Allocator *r)
{
ACE_TRACE ("ACE_Allocator::instance");
ACE_MT (ACE_GUARD_RETURN (ACE_Recursive_Thread_Mutex, ace_mon,
*ACE_Static_Object_Lock::instance (), 0));
ACE_Allocator *t = ACE_Allocator::allocator_;
// We can't safely delete it since we don't know who created it!
ACE_Allocator::delete_allocator_ = 0;
ACE_Allocator::allocator_ = r;
return t;
}
void
ACE_Allocator::close_singleton (void)
{
ACE_TRACE ("ACE_Allocator::close_singleton");
ACE_MT (ACE_GUARD (ACE_Recursive_Thread_Mutex, ace_mon,
*ACE_Static_Object_Lock::instance ()));
if (ACE_Allocator::delete_allocator_)
{
// This should never be executed.... See the
// ACE_Allocator::instance (void) method for an explanation.
delete ACE_Allocator::allocator_;
ACE_Allocator::allocator_ = 0;
ACE_Allocator::delete_allocator_ = 0;
}
}
ACE_Allocator::~ACE_Allocator (void)
{
ACE_TRACE ("ACE_Allocator::~ACE_Allocator");
}
ACE_Allocator::ACE_Allocator (void)
{
ACE_TRACE ("ACE_Allocator::ACE_Allocator");
}
/******************************************************************************/
void *
ACE_New_Allocator::malloc (size_t nbytes)
{
char *ptr = 0;
if (nbytes > 0)
ACE_NEW_RETURN (ptr, char[nbytes], 0);
return (void *) ptr;
}
void *
ACE_New_Allocator::calloc (size_t nbytes,
char initial_value)
{
char *ptr = 0;
ACE_NEW_RETURN (ptr, char[nbytes], 0);
ACE_OS::memset (ptr, initial_value, nbytes);
return (void *) ptr;
}
void
ACE_New_Allocator::free (void *ptr)
{
delete [] (char *) ptr;
}
/******************************************************************************/
void
ACE_Static_Allocator_Base::dump (void) const
{
#if defined (ACE_HAS_DUMP)
ACE_TRACE ("ACE_Static_Allocator_Base::dump");
ACE_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
ACE_DEBUG ((LM_DEBUG, ACE_LIB_TEXT ("\noffset_ = %d"), this->offset_));
ACE_DEBUG ((LM_DEBUG, ACE_LIB_TEXT ("\nsize_ = %d\n"), this->size_));
ACE_HEX_DUMP ((LM_DEBUG, this->buffer_, this->size_));
ACE_DEBUG ((LM_DEBUG, ACE_LIB_TEXT ("\n")));
ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP));
#endif /* ACE_HAS_DUMP */
}
#endif /* ACE_MALLOC_ALLOCATOR_CPP */
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