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/*
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* tclMacAlloc.c --
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|
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*
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|
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* This is a very fast storage allocator. It allocates blocks of a
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|
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* small number of different sizes, and keeps free lists of each size.
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|
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* Blocks that don't exactly fit are passed up to the next larger size.
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|
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* Blocks over a certain size are directly allocated by calling NewPtr.
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|
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*
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|
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* Copyright (c) 1983 Regents of the University of California.
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* Copyright (c) 1996-1997 Sun Microsystems, Inc.
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*
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* Portions contributed by Chris Kingsley, Jack Jansen and Ray Johnson
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*.
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* RCS: @(#) $Id: tclMacAlloc.c,v 1.5 2001/11/23 01:27:09 das Exp $
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*/
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#include "tclInt.h"
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#include "tclMacInt.h"
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#include <Memory.h>
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#include <Gestalt.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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* Flags that are used by ConfigureMemory to define how the allocator
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* should work. They can be or'd together.
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*/
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#define MEMORY_ALL_SYS 1 /* All memory should come from the system
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heap. */
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#define MEMORY_DONT_USE_TEMPMEM 2 /* Don't use temporary memory but system memory. */
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/*
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* Amount of space to leave in the application heap for the Toolbox to work.
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*/
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#define TOOLBOX_SPACE (512 * 1024)
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static int memoryFlags = 0;
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static Handle toolGuardHandle = NULL;
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/* This handle must be around so that we don't
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* have NewGWorld failures. This handle is
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* purgeable. Before we allocate any blocks,
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* we see if this handle is still around.
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* If it is not, then we try to get it again.
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* If we can get it, we lock it and try
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* to do the normal allocation, unlocking on
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* the way out. If we can't, we go to the
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* system heap directly. */
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static int tclUseMemTracking = 0; /* Are we tracking memory allocations?
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* On recent versions of the MacOS this
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* is no longer necessary, as we can use
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* temporary memory which is freed by the
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* OS after a quit or crash. */
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static size_t tclExtraHdlSize = 0; /* Size of extra memory allocated at the start
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* of each block when using memory tracking
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* ( == 0 otherwise) */
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/*
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* The following typedef and variable are used to keep track of memory
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* blocks that are allocated directly from the System Heap. These chunks
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* of memory must always be freed - even if we crash.
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*/
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typedef struct listEl {
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Handle memoryHandle;
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struct listEl * next;
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struct listEl * prec;
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} ListEl;
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static ListEl * systemMemory = NULL;
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static ListEl * appMemory = NULL;
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/*
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* Prototypes for functions used only in this file.
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*/
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static pascal void CleanUpExitProc _ANSI_ARGS_((void));
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void ConfigureMemory _ANSI_ARGS_((int flags));
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void FreeAllMemory _ANSI_ARGS_((void));
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/*
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*----------------------------------------------------------------------
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*
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|
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* TclpSysRealloc --
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*
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* This function reallocates a chunk of system memory. If the
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* chunk is already big enough to hold the new block, then no
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* allocation happens.
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|
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*
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|
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* Results:
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* Returns a pointer to the newly allocated block.
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|
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*
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|
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* Side effects:
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* May copy the contents of the original block to the new block
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* and deallocate the original block.
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*
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*----------------------------------------------------------------------
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*/
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105 |
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VOID *
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107 |
TclpSysRealloc(
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|
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VOID *oldPtr, /* Original block */
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|
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unsigned int size) /* New size of block. */
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|
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{
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|
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Handle hand;
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|
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void *newPtr;
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|
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int maxsize;
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|
114 |
OSErr err;
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|
115 |
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|
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if (tclUseMemTracking) {
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|
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hand = ((ListEl *) ((Ptr) oldPtr - tclExtraHdlSize))->memoryHandle;
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|
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|
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} else {
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|
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hand = RecoverHandle((Ptr) oldPtr);
|
|
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|
120 |
}
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|
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maxsize = GetHandleSize(hand) - sizeof(Handle);
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|
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|
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if (maxsize < size) {
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|
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HUnlock(hand);
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|
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|
124 |
SetHandleSize(hand,size + tclExtraHdlSize);
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|
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err = MemError();
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|
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|
126 |
HLock(hand);
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|
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if(err==noErr){
|
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|
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newPtr=(*hand + tclExtraHdlSize);
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|
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|
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} else {
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|
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newPtr = TclpSysAlloc(size, 1);
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|
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|
131 |
if(newPtr!=NULL) {
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|
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|
132 |
memmove(newPtr, oldPtr, maxsize);
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|
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|
133 |
TclpSysFree(oldPtr);
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|
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|
134 |
}
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|
135 |
}
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|
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} else {
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|
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newPtr = oldPtr;
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|
138 |
}
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|
139 |
return newPtr;
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|
140 |
}
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|
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|
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|
142 |
/*
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|
143 |
*----------------------------------------------------------------------
|
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|
144 |
*
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|
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|
145 |
* TclpSysAlloc --
|
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|
146 |
*
|
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|
147 |
* Allocate a new block of memory free from the System.
|
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|
148 |
*
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|
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* Results:
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|
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* Returns a pointer to a new block of memory.
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|
151 |
*
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|
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* Side effects:
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|
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* May obtain memory from app or sys space. Info is added to
|
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|
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* overhead lists etc.
|
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|
155 |
*
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|
156 |
*----------------------------------------------------------------------
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|
157 |
*/
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|
158 |
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VOID *
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|
160 |
TclpSysAlloc(
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161 |
long size, /* Size of block to allocate. */
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|
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|
162 |
int isBin) /* Is this a bin allocation? */
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|
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|
163 |
{
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|
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|
164 |
Handle hand = NULL;
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|
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|
165 |
ListEl * newMemoryRecord;
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|
166 |
int isSysMem = 0;
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|
167 |
static int initialized=0;
|
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|
168 |
|
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|
169 |
if (!initialized) {
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|
170 |
long response = 0;
|
|
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|
171 |
OSErr err = noErr;
|
|
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|
172 |
int useTempMem = 0;
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|
173 |
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|
174 |
/* Check if we can use temporary memory */
|
|
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|
175 |
initialized=1;
|
|
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|
176 |
err = Gestalt(gestaltOSAttr, &response);
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|
177 |
if (err == noErr) {
|
|
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|
178 |
useTempMem = response & (1 << gestaltRealTempMemory);
|
|
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|
179 |
}
|
|
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|
180 |
tclUseMemTracking = !useTempMem || (memoryFlags & MEMORY_DONT_USE_TEMPMEM);
|
|
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|
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if(tclUseMemTracking) {
|
|
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|
182 |
tclExtraHdlSize = sizeof(ListEl);
|
|
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|
183 |
/*
|
|
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|
184 |
* We are allocating memory directly from the system
|
|
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|
185 |
* heap. We need to install an exit handle
|
|
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|
186 |
* to ensure the memory is cleaned up.
|
|
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|
187 |
*/
|
|
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|
188 |
TclMacInstallExitToShellPatch(CleanUpExitProc);
|
|
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|
189 |
}
|
|
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|
190 |
}
|
|
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|
191 |
|
|
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|
192 |
if (!(memoryFlags & MEMORY_ALL_SYS)) {
|
|
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|
193 |
|
|
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|
194 |
/*
|
|
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|
195 |
* If the guard handle has been purged, throw it away and try
|
|
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|
196 |
* to allocate it again.
|
|
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|
197 |
*/
|
|
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|
198 |
|
|
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|
199 |
if ((toolGuardHandle != NULL) && (*toolGuardHandle == NULL)) {
|
|
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|
200 |
DisposeHandle(toolGuardHandle);
|
|
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|
201 |
toolGuardHandle = NULL;
|
|
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|
202 |
}
|
|
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|
203 |
|
|
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|
204 |
/*
|
|
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|
205 |
* If we have never allocated the guard handle, or it was purged
|
|
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|
206 |
* and thrown away, then try to allocate it again.
|
|
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|
207 |
*/
|
|
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|
208 |
|
|
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|
209 |
if (toolGuardHandle == NULL) {
|
|
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|
210 |
toolGuardHandle = NewHandle(TOOLBOX_SPACE);
|
|
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|
211 |
if (toolGuardHandle != NULL) {
|
|
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|
212 |
HLock(toolGuardHandle);
|
|
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|
213 |
HPurge(toolGuardHandle);
|
|
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|
214 |
}
|
|
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|
215 |
}
|
|
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|
216 |
|
|
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|
217 |
/*
|
|
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|
218 |
* If we got the handle, lock it and do our allocation.
|
|
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|
219 |
*/
|
|
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|
220 |
|
|
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|
221 |
if (toolGuardHandle != NULL) {
|
|
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|
222 |
HLock(toolGuardHandle);
|
|
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|
223 |
hand = NewHandle(size + tclExtraHdlSize);
|
|
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|
224 |
HUnlock(toolGuardHandle);
|
|
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|
225 |
}
|
|
sl@0
|
226 |
}
|
|
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|
227 |
if (hand == NULL) {
|
|
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|
228 |
/*
|
|
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|
229 |
* Ran out of memory in application space. Lets try to get
|
|
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|
230 |
* more memory from system. Otherwise, we return NULL to
|
|
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|
231 |
* denote failure.
|
|
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|
232 |
*/
|
|
sl@0
|
233 |
if(!tclUseMemTracking) {
|
|
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|
234 |
/* Use Temporary Memory instead of System Heap when available */
|
|
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|
235 |
OSErr err;
|
|
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|
236 |
isBin = 1; /* always HLockHi TempMemHandles */
|
|
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|
237 |
hand = TempNewHandle(size + tclExtraHdlSize,&err);
|
|
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|
238 |
if(err!=noErr) { hand=NULL; }
|
|
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|
239 |
} else {
|
|
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|
240 |
/* Use system heap when tracking memory */
|
|
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|
241 |
isSysMem=1;
|
|
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|
242 |
isBin = 0;
|
|
sl@0
|
243 |
hand = NewHandleSys(size + tclExtraHdlSize);
|
|
sl@0
|
244 |
}
|
|
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|
245 |
}
|
|
sl@0
|
246 |
if (hand == NULL) {
|
|
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|
247 |
return NULL;
|
|
sl@0
|
248 |
}
|
|
sl@0
|
249 |
if (isBin) {
|
|
sl@0
|
250 |
HLockHi(hand);
|
|
sl@0
|
251 |
} else {
|
|
sl@0
|
252 |
HLock(hand);
|
|
sl@0
|
253 |
}
|
|
sl@0
|
254 |
if(tclUseMemTracking) {
|
|
sl@0
|
255 |
/* Only need to do this when tracking memory */
|
|
sl@0
|
256 |
newMemoryRecord = (ListEl *) *hand;
|
|
sl@0
|
257 |
newMemoryRecord->memoryHandle = hand;
|
|
sl@0
|
258 |
newMemoryRecord->prec = NULL;
|
|
sl@0
|
259 |
if(isSysMem) {
|
|
sl@0
|
260 |
newMemoryRecord->next = systemMemory;
|
|
sl@0
|
261 |
systemMemory = newMemoryRecord;
|
|
sl@0
|
262 |
} else {
|
|
sl@0
|
263 |
newMemoryRecord->next = appMemory;
|
|
sl@0
|
264 |
appMemory = newMemoryRecord;
|
|
sl@0
|
265 |
}
|
|
sl@0
|
266 |
if(newMemoryRecord->next!=NULL) {
|
|
sl@0
|
267 |
newMemoryRecord->next->prec=newMemoryRecord;
|
|
sl@0
|
268 |
}
|
|
sl@0
|
269 |
}
|
|
sl@0
|
270 |
|
|
sl@0
|
271 |
return (*hand + tclExtraHdlSize);
|
|
sl@0
|
272 |
}
|
|
sl@0
|
273 |
|
|
sl@0
|
274 |
/*
|
|
sl@0
|
275 |
*----------------------------------------------------------------------
|
|
sl@0
|
276 |
*
|
|
sl@0
|
277 |
* TclpSysFree --
|
|
sl@0
|
278 |
*
|
|
sl@0
|
279 |
* Free memory that we allocated back to the system.
|
|
sl@0
|
280 |
*
|
|
sl@0
|
281 |
* Results:
|
|
sl@0
|
282 |
* None.
|
|
sl@0
|
283 |
*
|
|
sl@0
|
284 |
* Side effects:
|
|
sl@0
|
285 |
* Memory is freed.
|
|
sl@0
|
286 |
*
|
|
sl@0
|
287 |
*----------------------------------------------------------------------
|
|
sl@0
|
288 |
*/
|
|
sl@0
|
289 |
|
|
sl@0
|
290 |
void
|
|
sl@0
|
291 |
TclpSysFree(
|
|
sl@0
|
292 |
void * ptr) /* Free this system memory. */
|
|
sl@0
|
293 |
{
|
|
sl@0
|
294 |
if(tclUseMemTracking) {
|
|
sl@0
|
295 |
/* Only need to do this when tracking memory */
|
|
sl@0
|
296 |
ListEl *memRecord;
|
|
sl@0
|
297 |
|
|
sl@0
|
298 |
memRecord = (ListEl *) ((Ptr) ptr - tclExtraHdlSize);
|
|
sl@0
|
299 |
/* Remove current record from linked list */
|
|
sl@0
|
300 |
if(memRecord->next!=NULL) {
|
|
sl@0
|
301 |
memRecord->next->prec=memRecord->prec;
|
|
sl@0
|
302 |
}
|
|
sl@0
|
303 |
if(memRecord->prec!=NULL) {
|
|
sl@0
|
304 |
memRecord->prec->next=memRecord->next;
|
|
sl@0
|
305 |
}
|
|
sl@0
|
306 |
if(memRecord==appMemory) {
|
|
sl@0
|
307 |
appMemory=memRecord->next;
|
|
sl@0
|
308 |
} else if(memRecord==systemMemory) {
|
|
sl@0
|
309 |
systemMemory=memRecord->next;
|
|
sl@0
|
310 |
}
|
|
sl@0
|
311 |
DisposeHandle(memRecord->memoryHandle);
|
|
sl@0
|
312 |
} else {
|
|
sl@0
|
313 |
DisposeHandle(RecoverHandle((Ptr) ptr));
|
|
sl@0
|
314 |
}
|
|
sl@0
|
315 |
}
|
|
sl@0
|
316 |
|
|
sl@0
|
317 |
/*
|
|
sl@0
|
318 |
*----------------------------------------------------------------------
|
|
sl@0
|
319 |
*
|
|
sl@0
|
320 |
* CleanUpExitProc --
|
|
sl@0
|
321 |
*
|
|
sl@0
|
322 |
* This procedure is invoked as an exit handler when ExitToShell
|
|
sl@0
|
323 |
* is called. It removes any memory that was allocated directly
|
|
sl@0
|
324 |
* from the system heap. This must be called when the application
|
|
sl@0
|
325 |
* quits or the memory will never be freed.
|
|
sl@0
|
326 |
*
|
|
sl@0
|
327 |
* Results:
|
|
sl@0
|
328 |
* None.
|
|
sl@0
|
329 |
*
|
|
sl@0
|
330 |
* Side effects:
|
|
sl@0
|
331 |
* May free memory in the system heap.
|
|
sl@0
|
332 |
*
|
|
sl@0
|
333 |
*----------------------------------------------------------------------
|
|
sl@0
|
334 |
*/
|
|
sl@0
|
335 |
|
|
sl@0
|
336 |
static pascal void
|
|
sl@0
|
337 |
CleanUpExitProc()
|
|
sl@0
|
338 |
{
|
|
sl@0
|
339 |
ListEl * memRecord;
|
|
sl@0
|
340 |
|
|
sl@0
|
341 |
if(tclUseMemTracking) {
|
|
sl@0
|
342 |
/* Only need to do this when tracking memory */
|
|
sl@0
|
343 |
while (systemMemory != NULL) {
|
|
sl@0
|
344 |
memRecord = systemMemory;
|
|
sl@0
|
345 |
systemMemory = memRecord->next;
|
|
sl@0
|
346 |
DisposeHandle(memRecord->memoryHandle);
|
|
sl@0
|
347 |
}
|
|
sl@0
|
348 |
}
|
|
sl@0
|
349 |
}
|
|
sl@0
|
350 |
|
|
sl@0
|
351 |
/*
|
|
sl@0
|
352 |
*----------------------------------------------------------------------
|
|
sl@0
|
353 |
*
|
|
sl@0
|
354 |
* FreeAllMemory --
|
|
sl@0
|
355 |
*
|
|
sl@0
|
356 |
* This procedure frees all memory blocks allocated by the memory
|
|
sl@0
|
357 |
* sub-system. Make sure you don't have any code that references
|
|
sl@0
|
358 |
* any malloced data!
|
|
sl@0
|
359 |
*
|
|
sl@0
|
360 |
* Results:
|
|
sl@0
|
361 |
* None.
|
|
sl@0
|
362 |
*
|
|
sl@0
|
363 |
* Side effects:
|
|
sl@0
|
364 |
* Frees all memory allocated by TclpAlloc.
|
|
sl@0
|
365 |
*
|
|
sl@0
|
366 |
*----------------------------------------------------------------------
|
|
sl@0
|
367 |
*/
|
|
sl@0
|
368 |
|
|
sl@0
|
369 |
void
|
|
sl@0
|
370 |
FreeAllMemory()
|
|
sl@0
|
371 |
{
|
|
sl@0
|
372 |
ListEl * memRecord;
|
|
sl@0
|
373 |
|
|
sl@0
|
374 |
if(tclUseMemTracking) {
|
|
sl@0
|
375 |
/* Only need to do this when tracking memory */
|
|
sl@0
|
376 |
while (systemMemory != NULL) {
|
|
sl@0
|
377 |
memRecord = systemMemory;
|
|
sl@0
|
378 |
systemMemory = memRecord->next;
|
|
sl@0
|
379 |
DisposeHandle(memRecord->memoryHandle);
|
|
sl@0
|
380 |
}
|
|
sl@0
|
381 |
while (appMemory != NULL) {
|
|
sl@0
|
382 |
memRecord = appMemory;
|
|
sl@0
|
383 |
appMemory = memRecord->next;
|
|
sl@0
|
384 |
DisposeHandle(memRecord->memoryHandle);
|
|
sl@0
|
385 |
}
|
|
sl@0
|
386 |
}
|
|
sl@0
|
387 |
}
|
|
sl@0
|
388 |
|
|
sl@0
|
389 |
/*
|
|
sl@0
|
390 |
*----------------------------------------------------------------------
|
|
sl@0
|
391 |
*
|
|
sl@0
|
392 |
* ConfigureMemory --
|
|
sl@0
|
393 |
*
|
|
sl@0
|
394 |
* This procedure sets certain flags in this file that control
|
|
sl@0
|
395 |
* how memory is allocated and managed. This call must be made
|
|
sl@0
|
396 |
* before any call to TclpAlloc is made.
|
|
sl@0
|
397 |
*
|
|
sl@0
|
398 |
* Results:
|
|
sl@0
|
399 |
* None.
|
|
sl@0
|
400 |
*
|
|
sl@0
|
401 |
* Side effects:
|
|
sl@0
|
402 |
* Certain state will be changed.
|
|
sl@0
|
403 |
*
|
|
sl@0
|
404 |
*----------------------------------------------------------------------
|
|
sl@0
|
405 |
*/
|
|
sl@0
|
406 |
|
|
sl@0
|
407 |
void
|
|
sl@0
|
408 |
ConfigureMemory(
|
|
sl@0
|
409 |
int flags) /* Flags that control memory alloc scheme. */
|
|
sl@0
|
410 |
{
|
|
sl@0
|
411 |
memoryFlags = flags;
|
|
sl@0
|
412 |
}
|