#include <misc.h>
Classes | |
struct | _page |
Public Member Functions | |
int | getPages (void) |
Return the total number of pages that have been allocated for this memory pool. | |
Protected Member Functions | |
virtual void * | first (size_t size) |
Allocate first workspace from paged memory. | |
virtual void * | alloc (size_t size) |
Allocate memory from either the currently active page, or allocate a new page for the object. | |
char * | first (char *str) |
Allocate a string from the memory pager pool and copy the string into it's new memory area. | |
char * | alloc (const char *str) |
Allocate a string from the memory pager pool and copy the string inti it's new memory area. | |
MemPager (size_t pagesize=4096) | |
Create a paged memory pool for cumulative storage. | |
void | purge (void) |
purge the current memory pool. | |
void | clean (void) |
Clean for memory cleanup before exiting. | |
virtual | ~MemPager () |
Delete the memory pool and all allocated memory. | |
Friends | |
class | String |
class | MemPagerObject |
When the object is destroyed, all accumulated data is automatically purged.
There are a number of odd and specialized utility classes found in Common C++. The most common of these is the "MemPager" class. This is basically a class to enable page-grouped "cumulative" memory allocation; all accumulated allocations are dropped during the destructor. This class has found it's way in a lot of other utility classes in Common C++.
ost::MemPager::MemPager | ( | size_t | pagesize = 4096 |
) | [protected] |
Create a paged memory pool for cumulative storage.
This pool allocates memory in fixed "pagesize" chunks. Ideal performance is achived when the pool size matches the system page size. This pool can only exist in derived objects.
pagesize | page size to allocate chunks. |
virtual ost::MemPager::~MemPager | ( | ) | [protected, virtual] |
Delete the memory pool and all allocated memory.
char* ost::MemPager::alloc | ( | const char * | str | ) | [protected] |
Allocate a string from the memory pager pool and copy the string inti it's new memory area.
This checks only the last active page for available space before allocating a new page.
str | string to allocate and copy into paged memory pool. |
virtual void* ost::MemPager::alloc | ( | size_t | size | ) | [protected, virtual] |
Allocate memory from either the currently active page, or allocate a new page for the object.
size | size of memory to allocate. |
Reimplemented in ost::SharedMemPager.
Referenced by ost::MemPagerObject::operator new(), and ost::MemPagerObject::operator new[]().
void ost::MemPager::clean | ( | void | ) | [protected] |
Clean for memory cleanup before exiting.
char* ost::MemPager::first | ( | char * | str | ) | [protected] |
Allocate a string from the memory pager pool and copy the string into it's new memory area.
This method allocates memory by first searching for an available page, and then allocating a new page if no space is found.
str | string to allocate and copy into paged memory pool. |
virtual void* ost::MemPager::first | ( | size_t | size | ) | [protected, virtual] |
Allocate first workspace from paged memory.
This method scans all currently allocated blocks for available space before adding new pages and hence is both slower and more efficient.
size | size of memory to allocate. |
Reimplemented in ost::SharedMemPager.
int ost::MemPager::getPages | ( | void | ) | [inline] |
Return the total number of pages that have been allocated for this memory pool.
void ost::MemPager::purge | ( | void | ) | [protected] |
friend class MemPagerObject [friend] |
friend class String [friend] |