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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Malloc_Base.h
//
// = AUTHOR
// Doug Schmidt and Irfan Pyarali
//
// ============================================================================
#ifndef ACE_MALLOC_BASE_H
#define ACE_MALLOC_BASE_H
// The definition of this class is located in Malloc.cpp.
class ACE_Export ACE_Allocator
{
// = TITLE
// Interface for a dynamic memory allocator that uses inheritance
// and dynamic binding to provide extensible mechanisms for
// allocating and deallocating memory.
public:
// = Memory Management
static ACE_Allocator *instance (void);
// Get pointer to a default <ACE_Allocator>.
static ACE_Allocator *instance (ACE_Allocator *);
// Set pointer to a process-wide <ACE_Allocator> and return existing
// pointer.
static void close_singleton (void);
// Delete the dynamically allocated Singleton
ACE_Allocator (void);
// "No-op" constructor (needed to make certain compilers happy).
virtual ~ACE_Allocator (void);
// Virtual destructor
virtual void *malloc (size_t nbytes) = 0;
// Allocate <nbytes>, but don't give them any initial value.
virtual void *calloc (size_t nbytes, char initial_value = '\0') = 0;
// Allocate <nbytes>, giving them <initial_value>.
virtual void free (void *ptr) = 0;
// Free <ptr> (must have been allocated by <ACE_Allocator::malloc>).
virtual int remove (void) = 0;
// Remove any resources associated with this memory manager.
// = Map manager like functions
virtual int bind (const char *name, void *pointer, int duplicates = 0) = 0;
// Associate <name> with <pointer>. If <duplicates> == 0 then do
// not allow duplicate <name>/<pointer> associations, else if
// <duplicates> != 0 then allow duplicate <name>/<pointer>
// assocations. Returns 0 if successfully binds (1) a previously
// unbound <name> or (2) <duplicates> != 0, returns 1 if trying to
// bind a previously bound <name> and <duplicates> == 0, else
// returns -1 if a resource failure occurs.
virtual int trybind (const char *name, void *&pointer) = 0;
// Associate <name> with <pointer>. Does not allow duplicate
// <name>/<pointer> associations. Returns 0 if successfully binds
// (1) a previously unbound <name>, 1 if trying to bind a previously
// bound <name>, or returns -1 if a resource failure occurs. When
// this call returns <pointer>'s value will always reference the
// void * that <name> is associated with. Thus, if the caller needs
// to use <pointer> (e.g., to free it) a copy must be maintained by
// the caller.
virtual int find (const char *name, void *&pointer) = 0;
// Locate <name> and pass out parameter via pointer. If found,
// return 0, Returns -1 if failure occurs.
virtual int find (const char *name) = 0;
// returns 0 if the name is in the mapping. -1, otherwise.
virtual int unbind (const char *name) = 0;
// Unbind (remove) the name from the map. Don't return the pointer
// to the caller
virtual int unbind (const char *name, void *&pointer) = 0;
// Break any association of name. Returns the value of pointer in
// case the caller needs to deallocate memory.
// = Protection and "sync" (i.e., flushing memory to persistent
// backing store).
virtual int sync (ssize_t len = -1, int flags = MS_SYNC) = 0;
// Sync <len> bytes of the memory region to the backing store
// starting at <this->base_addr_>. If <len> == -1 then sync the
// whole region.
virtual int sync (void *addr, size_t len, int flags = MS_SYNC) = 0;
// Sync <len> bytes of the memory region to the backing store
// starting at <addr_>.
virtual int protect (ssize_t len = -1, int prot = PROT_RDWR) = 0;
// Change the protection of the pages of the mapped region to <prot>
// starting at <this->base_addr_> up to <len> bytes. If <len> == -1
// then change protection of all pages in the mapped region.
virtual int protect (void *addr, size_t len, int prot = PROT_RDWR) = 0;
// Change the protection of the pages of the mapped region to <prot>
// starting at <addr> up to <len> bytes.
#if defined (ACE_HAS_MALLOC_STATS)
virtual void print_stats (void) const = 0;
// Dump statistics of how malloc is behaving.
#endif /* ACE_HAS_MALLOC_STATS */
virtual void dump (void) const = 0;
// Dump the state of the object.
private:
// DO NOT ADD ANY STATE (DATA MEMBERS) TO THIS CLASS!!!! See the
// <ACE_Allocator::instance> implementation for explanation.
static ACE_Allocator *allocator_;
// Pointer to a process-wide <ACE_Allocator> instance.
static int delete_allocator_;
// Must delete the <allocator_> if non-0.
};
#endif /* ACE_MALLOC_BASE_H */
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