hunk.c File Reference

#include "shared/shared.h"
#include "system/hunk.h"
#include <windows.h>

Go to the source code of this file.

Functions
void	Hunk_Begin (memhunk_t *hunk, size_t maxsize)
void *	Hunk_Alloc (memhunk_t *hunk, size_t size)
void	Hunk_End (memhunk_t *hunk)
void	Hunk_Free (memhunk_t *hunk)

Function Documentation

Hunk_Alloc()

void* Hunk_Alloc	(	memhunk_t *	hunk,
		size_t	size
	)

Definition at line 38 of file hunk.c.

{
    void *buf;
 
    if (size > SIZE_MAX - 63)
        Com_Error(ERR_FATAL, "%s: size > SIZE_MAX", __func__);
 
    // round to cacheline
    size = (size + 63) & ~63;
 
    if (hunk->cursize > hunk->maxsize)
        Com_Error(ERR_FATAL, "%s: cursize > maxsize", __func__);
 
    if (size > hunk->maxsize - hunk->cursize)
        Com_Error(ERR_FATAL, "%s: couldn't allocate %"PRIz" bytes", __func__, size);
 
    hunk->cursize += size;
 
    // commit pages as needed
    buf = VirtualAlloc(hunk->base, hunk->cursize, MEM_COMMIT, PAGE_READWRITE);
    if (!buf)
        Com_Error(ERR_FATAL,
                  "VirtualAlloc commit %"PRIz" bytes failed with error %lu",
                  hunk->cursize, GetLastError());
 
    return (byte *)hunk->base + hunk->cursize - size;
}

Referenced by GL_LoadWorld().

Hunk_Begin()

void Hunk_Begin	(	memhunk_t *	hunk,
		size_t	maxsize
	)

Definition at line 23 of file hunk.c.

{
    if (maxsize > SIZE_MAX - 4095)
        Com_Error(ERR_FATAL, "%s: size > SIZE_MAX", __func__);
 
    // reserve a huge chunk of memory, but don't commit any yet
    hunk->cursize = 0;
    hunk->maxsize = (maxsize + 4095) & ~4095;
    hunk->base = VirtualAlloc(NULL, hunk->maxsize, MEM_RESERVE, PAGE_NOACCESS);
    if (!hunk->base)
        Com_Error(ERR_FATAL,
                  "VirtualAlloc reserve %"PRIz" bytes failed with error %lu",
                  hunk->maxsize, GetLastError());
}

Referenced by BSP_Load(), GL_LoadWorld(), MOD_LoadMD2(), MOD_LoadMD2_GL(), MOD_LoadMD2_RTX(), and MOD_LoadSP2().

Hunk_End()

void Hunk_End

(

memhunk_t *

hunk

)

Definition at line 66 of file hunk.c.

{
    if (hunk->cursize > hunk->maxsize)
        Com_Error(ERR_FATAL, "%s: cursize > maxsize", __func__);
 
    // for statistics
    hunk->mapped = (hunk->cursize + 4095) & ~4095;
}

Referenced by BSP_Load(), GL_LoadWorld(), MOD_LoadMD2(), MOD_LoadMD2_GL(), MOD_LoadMD2_RTX(), and MOD_LoadSP2().

Hunk_Free()

void Hunk_Free

(

memhunk_t *

hunk

)

Definition at line 75 of file hunk.c.

{
    if (hunk->base && !VirtualFree(hunk->base, 0, MEM_RELEASE))
        Com_Error(ERR_FATAL, "VirtualFree failed with error %lu", GetLastError());
 
    memset(hunk, 0, sizeof(*hunk));
}

Referenced by BSP_Free(), BSP_Load(), GL_FreeWorld(), MOD_FreeAll(), MOD_FreeUnused(), MOD_LoadMD2(), MOD_LoadMD2_GL(), and MOD_LoadMD2_RTX().