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SysAlloc.cpp
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SysAlloc.cpp
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#include "SysAlloc.h"
namespace Odin
{
namespace SysAlloc
{
void* reserveSegment(size_t size, void* ptr)
{
#if ODIN_PLATFORM == ODIN_PLATFORM_WIN32
LPVOID basePtr = VirtualAlloc(
ptr,
size,
MEM_RESERVE,
PAGE_NOACCESS);
if (basePtr == NULL)
return 0;
else
return basePtr;
#endif
}
//----------------------------------------------------------------------------------------------------------------------
// Release a segment
void releaseSegment(void* ptr, size_t size)
{
#if ODIN_PLATFORM == ODIN_PLATFORM_WIN32
BOOL success = VirtualFree(
ptr,
0,
MEM_RELEASE);
#endif
}
//----------------------------------------------------------------------------------------------------------------------
// Commit a page
void commitPage(void* ptr, size_t size)
{
#if ODIN_PLATFORM == ODIN_PLATFORM_WIN32
LPVOID result_ptr = VirtualAlloc(
reinterpret_cast<LPVOID>(ptr),
size,
MEM_COMMIT,
PAGE_READWRITE);
#endif
}
//----------------------------------------------------------------------------------------------------------------------
// Decommit a page
void decommitPage(void* ptr, size_t size)
{
#if ODIN_PLATFORM == ODIN_PLATFORM_WIN32
BOOL result = VirtualFree(
reinterpret_cast<LPVOID>(ptr),
size,
MEM_DECOMMIT);
#endif
}
//----------------------------------------------------------------------------------------------------------------------
// Reserve and commit a segment
// This function will bypass the direct mapped cache and directly commits
// pages from the system.
void* reserveCommitSegment(size_t size)
{
#if ODIN_PLATFORM == ODIN_PLATFORM_WIN32
LPVOID basePtr = VirtualAlloc(
NULL,
size,
MEM_COMMIT | MEM_RESERVE,
PAGE_READWRITE);
if (basePtr == NULL)
return 0;
else
return basePtr;
#endif
}
}
}