author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 16:57:14 +0300 | |
branch | RCL_3 |
changeset 23 | 26645d81f48d |
parent 0 | 08ec8eefde2f |
permissions | -rw-r--r-- |
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/* |
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* tclPreserve.c -- |
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* |
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* This file contains a collection of procedures that are used |
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* to make sure that widget records and other data structures |
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* aren't reallocated when there are nested procedures that |
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* depend on their existence. |
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* |
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* Copyright (c) 1991-1994 The Regents of the University of California. |
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* Copyright (c) 1994-1998 Sun Microsystems, Inc. |
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* Portions Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiaries. All rights reserved. |
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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: tclPreserve.c,v 1.3.34.2 2005/06/24 18:21:41 kennykb Exp $ |
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*/ |
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|
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#include "tclInt.h" |
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/* |
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* The following data structure is used to keep track of all the |
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* Tcl_Preserve calls that are still in effect. It grows as needed |
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* to accommodate any number of calls in effect. |
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*/ |
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|
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typedef struct { |
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ClientData clientData; /* Address of preserved block. */ |
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int refCount; /* Number of Tcl_Preserve calls in effect |
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* for block. */ |
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int mustFree; /* Non-zero means Tcl_EventuallyFree was |
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* called while a Tcl_Preserve call was in |
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* effect, so the structure must be freed |
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* when refCount becomes zero. */ |
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Tcl_FreeProc *freeProc; /* Procedure to call to free. */ |
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} Reference; |
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|
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#if !defined(__SYMBIAN32__) || !defined(__WINSCW__) |
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static Reference *refArray; /* First in array of references. */ |
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static int spaceAvl = 0; /* Total number of structures available |
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* at *firstRefPtr. */ |
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static int inUse = 0; /* Count of structures currently in use |
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* in refArray. */ |
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#else |
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#define refArray (*(Reference**)get_refArray()) |
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#define spaceAvl (*(int *)get_spaceAvl()) |
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#define inUse (*(int *)get_inUse()) |
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#endif |
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#define INITIAL_SIZE 2 |
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TCL_DECLARE_MUTEX(preserveMutex)/* To protect the above statics */ |
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/* |
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* The following data structure is used to keep track of whether an |
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* arbitrary block of memory has been deleted. This is used by the |
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* TclHandle code to avoid the more time-expensive algorithm of |
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* Tcl_Preserve(). This mechanism is mainly used when we have lots of |
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* references to a few big, expensive objects that we don't want to live |
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* any longer than necessary. |
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*/ |
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|
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typedef struct HandleStruct { |
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VOID *ptr; /* Pointer to the memory block being |
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* tracked. This field will become NULL when |
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* the memory block is deleted. This field |
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* must be the first in the structure. */ |
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#ifdef TCL_MEM_DEBUG |
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VOID *ptr2; /* Backup copy of the abpve pointer used to |
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* ensure that the contents of the handle are |
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* not changed by anyone else. */ |
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#endif |
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int refCount; /* Number of TclHandlePreserve() calls in |
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* effect on this handle. */ |
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} HandleStruct; |
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/* |
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*---------------------------------------------------------------------- |
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* |
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* TclFinalizePreserve -- |
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* |
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* Called during exit processing to clean up the reference array. |
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* |
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* Results: |
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* None. |
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* |
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* Side effects: |
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* Frees the storage of the reference array. |
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* |
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*---------------------------------------------------------------------- |
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*/ |
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/* ARGSUSED */ |
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void |
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TclFinalizePreserve() |
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{ |
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Tcl_MutexLock(&preserveMutex); |
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if (spaceAvl != 0) { |
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ckfree((char *) refArray); |
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refArray = (Reference *) NULL; |
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inUse = 0; |
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spaceAvl = 0; |
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103 |
} |
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104 |
Tcl_MutexUnlock(&preserveMutex); |
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105 |
} |
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106 |
|
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107 |
/* |
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108 |
*---------------------------------------------------------------------- |
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109 |
* |
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110 |
* Tcl_Preserve -- |
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111 |
* |
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* This procedure is used by a procedure to declare its interest |
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* in a particular block of memory, so that the block will not be |
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* reallocated until a matching call to Tcl_Release has been made. |
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115 |
* |
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* Results: |
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* None. |
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118 |
* |
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* Side effects: |
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* Information is retained so that the block of memory will |
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* not be freed until at least the matching call to Tcl_Release. |
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122 |
* |
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123 |
*---------------------------------------------------------------------- |
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124 |
*/ |
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125 |
|
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126 |
EXPORT_C void |
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127 |
Tcl_Preserve(clientData) |
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ClientData clientData; /* Pointer to malloc'ed block of memory. */ |
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129 |
{ |
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130 |
Reference *refPtr; |
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131 |
int i; |
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132 |
|
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133 |
/* |
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* See if there is already a reference for this pointer. If so, |
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* just increment its reference count. |
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136 |
*/ |
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137 |
|
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138 |
Tcl_MutexLock(&preserveMutex); |
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for (i = 0, refPtr = refArray; i < inUse; i++, refPtr++) { |
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140 |
if (refPtr->clientData == clientData) { |
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141 |
refPtr->refCount++; |
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Tcl_MutexUnlock(&preserveMutex); |
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143 |
return; |
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144 |
} |
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145 |
} |
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146 |
|
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147 |
/* |
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* Make a reference array if it doesn't already exist, or make it |
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* bigger if it is full. |
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150 |
*/ |
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151 |
|
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152 |
if (inUse == spaceAvl) { |
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153 |
if (spaceAvl == 0) { |
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refArray = (Reference *) ckalloc((unsigned) |
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(INITIAL_SIZE*sizeof(Reference))); |
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spaceAvl = INITIAL_SIZE; |
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} else { |
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Reference *new; |
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159 |
|
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new = (Reference *) ckalloc((unsigned) |
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(2*spaceAvl*sizeof(Reference))); |
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memcpy((VOID *) new, (VOID *) refArray, |
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spaceAvl*sizeof(Reference)); |
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164 |
ckfree((char *) refArray); |
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refArray = new; |
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spaceAvl *= 2; |
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167 |
} |
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168 |
} |
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169 |
|
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170 |
/* |
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* Make a new entry for the new reference. |
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172 |
*/ |
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173 |
|
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174 |
refPtr = &refArray[inUse]; |
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175 |
refPtr->clientData = clientData; |
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refPtr->refCount = 1; |
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177 |
refPtr->mustFree = 0; |
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refPtr->freeProc = TCL_STATIC; |
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179 |
inUse += 1; |
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180 |
Tcl_MutexUnlock(&preserveMutex); |
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181 |
} |
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182 |
|
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183 |
/* |
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184 |
*---------------------------------------------------------------------- |
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185 |
* |
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186 |
* Tcl_Release -- |
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187 |
* |
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188 |
* This procedure is called to cancel a previous call to |
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189 |
* Tcl_Preserve, thereby allowing a block of memory to be |
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190 |
* freed (if no one else cares about it). |
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191 |
* |
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192 |
* Results: |
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193 |
* None. |
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194 |
* |
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195 |
* Side effects: |
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* If Tcl_EventuallyFree has been called for clientData, and if |
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* no other call to Tcl_Preserve is still in effect, the block of |
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198 |
* memory is freed. |
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199 |
* |
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200 |
*---------------------------------------------------------------------- |
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201 |
*/ |
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202 |
|
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203 |
EXPORT_C void |
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204 |
Tcl_Release(clientData) |
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205 |
ClientData clientData; /* Pointer to malloc'ed block of memory. */ |
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206 |
{ |
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207 |
Reference *refPtr; |
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208 |
int mustFree; |
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209 |
Tcl_FreeProc *freeProc; |
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int i; |
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211 |
|
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Tcl_MutexLock(&preserveMutex); |
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for (i = 0, refPtr = refArray; i < inUse; i++, refPtr++) { |
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if (refPtr->clientData != clientData) { |
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continue; |
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} |
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refPtr->refCount--; |
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if (refPtr->refCount == 0) { |
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219 |
|
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/* |
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* Must remove information from the slot before calling freeProc |
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* to avoid reentrancy problems if the freeProc calls Tcl_Preserve |
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* on the same clientData. Copy down the last reference in the |
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* array to overwrite the current slot. |
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*/ |
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226 |
|
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freeProc = refPtr->freeProc; |
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mustFree = refPtr->mustFree; |
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inUse--; |
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if (i < inUse) { |
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refArray[i] = refArray[inUse]; |
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} |
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if (mustFree) { |
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if (freeProc == TCL_DYNAMIC) { |
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ckfree((char *) clientData); |
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} else { |
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Tcl_MutexUnlock(&preserveMutex); |
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(*freeProc)((char *) clientData); |
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return; |
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} |
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} |
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} |
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Tcl_MutexUnlock(&preserveMutex); |
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return; |
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} |
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Tcl_MutexUnlock(&preserveMutex); |
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247 |
|
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/* |
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* Reference not found. This is a bug in the caller. |
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250 |
*/ |
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251 |
|
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panic("Tcl_Release couldn't find reference for 0x%x", clientData); |
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253 |
} |
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254 |
|
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255 |
/* |
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256 |
*---------------------------------------------------------------------- |
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* |
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* Tcl_EventuallyFree -- |
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259 |
* |
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* Free up a block of memory, unless a call to Tcl_Preserve is in |
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* effect for that block. In this case, defer the free until all |
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* calls to Tcl_Preserve have been undone by matching calls to |
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* Tcl_Release. |
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264 |
* |
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265 |
* Results: |
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* None. |
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267 |
* |
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* Side effects: |
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* Ptr may be released by calling free(). |
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270 |
* |
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271 |
*---------------------------------------------------------------------- |
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272 |
*/ |
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273 |
|
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274 |
EXPORT_C void |
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Tcl_EventuallyFree(clientData, freeProc) |
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ClientData clientData; /* Pointer to malloc'ed block of memory. */ |
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Tcl_FreeProc *freeProc; /* Procedure to actually do free. */ |
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278 |
{ |
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Reference *refPtr; |
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int i; |
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281 |
|
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282 |
/* |
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* See if there is a reference for this pointer. If so, set its |
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* "mustFree" flag (the flag had better not be set already!). |
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285 |
*/ |
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286 |
|
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Tcl_MutexLock(&preserveMutex); |
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for (i = 0, refPtr = refArray; i < inUse; i++, refPtr++) { |
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if (refPtr->clientData != clientData) { |
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continue; |
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291 |
} |
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292 |
if (refPtr->mustFree) { |
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panic("Tcl_EventuallyFree called twice for 0x%x\n", clientData); |
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294 |
} |
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refPtr->mustFree = 1; |
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296 |
refPtr->freeProc = freeProc; |
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297 |
Tcl_MutexUnlock(&preserveMutex); |
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298 |
return; |
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299 |
} |
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Tcl_MutexUnlock(&preserveMutex); |
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301 |
|
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302 |
/* |
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* No reference for this block. Free it now. |
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304 |
*/ |
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305 |
|
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306 |
if (freeProc == TCL_DYNAMIC) { |
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307 |
ckfree((char *) clientData); |
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308 |
} else { |
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(*freeProc)((char *)clientData); |
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310 |
} |
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311 |
} |
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312 |
|
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313 |
/* |
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314 |
*--------------------------------------------------------------------------- |
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315 |
* |
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|
316 |
* TclHandleCreate -- |
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|
317 |
* |
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|
318 |
* Allocate a handle that contains enough information to determine |
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|
319 |
* if an arbitrary malloc'd block has been deleted. This is |
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diff
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|
320 |
* used to avoid the more time-expensive algorithm of Tcl_Preserve(). |
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parents:
diff
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|
321 |
* |
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diff
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|
322 |
* Results: |
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parents:
diff
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|
323 |
* The return value is a TclHandle that refers to the given malloc'd |
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parents:
diff
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|
324 |
* block. Doubly dereferencing the returned handle will give |
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parents:
diff
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|
325 |
* back the pointer to the block, or will give NULL if the block has |
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parents:
diff
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|
326 |
* been deleted. |
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|
327 |
* |
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parents:
diff
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|
328 |
* Side effects: |
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parents:
diff
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|
329 |
* The caller must keep track of this handle (generally by storing |
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Revision: 201003
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parents:
diff
changeset
|
330 |
* it in a field in the malloc'd block) and call TclHandleFree() |
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Revision: 201003
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parents:
diff
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|
331 |
* on this handle when the block is deleted. Everything else that |
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Revision: 201003
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parents:
diff
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|
332 |
* wishes to keep track of whether the malloc'd block has been deleted |
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Revision: 201003
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parents:
diff
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|
333 |
* should use calls to TclHandlePreserve() and TclHandleRelease() |
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Revision: 201003
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parents:
diff
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|
334 |
* on the associated handle. |
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parents:
diff
changeset
|
335 |
* |
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Revision: 201003
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diff
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|
336 |
*--------------------------------------------------------------------------- |
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|
337 |
*/ |
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diff
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|
338 |
|
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|
339 |
TclHandle |
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340 |
TclHandleCreate(ptr) |
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|
341 |
VOID *ptr; /* Pointer to an arbitrary block of memory |
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Revision: 201003
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|
342 |
* to be tracked for deletion. Must not be |
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Revision: 201003
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parents:
diff
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|
343 |
* NULL. */ |
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|
344 |
{ |
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|
345 |
HandleStruct *handlePtr; |
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|
346 |
|
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|
347 |
handlePtr = (HandleStruct *) ckalloc(sizeof(HandleStruct)); |
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|
348 |
handlePtr->ptr = ptr; |
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Revision: 201003
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parents:
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|
349 |
#ifdef TCL_MEM_DEBUG |
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|
350 |
handlePtr->ptr2 = ptr; |
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Revision: 201003
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parents:
diff
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|
351 |
#endif |
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|
352 |
handlePtr->refCount = 0; |
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Revision: 201003
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parents:
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|
353 |
return (TclHandle) handlePtr; |
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|
354 |
} |
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|
355 |
|
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diff
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|
356 |
/* |
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|
357 |
*--------------------------------------------------------------------------- |
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|
358 |
* |
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parents:
diff
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|
359 |
* TclHandleFree -- |
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Revision: 201003
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parents:
diff
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|
360 |
* |
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Revision: 201003
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diff
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|
361 |
* Called when the arbitrary malloc'd block associated with the |
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Revision: 201003
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parents:
diff
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|
362 |
* handle is being deleted. Modifies the handle so that doubly |
08ec8eefde2f
Revision: 201003
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parents:
diff
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|
363 |
* dereferencing it will give NULL. This informs any user of the |
08ec8eefde2f
Revision: 201003
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parents:
diff
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|
364 |
* handle that the block of memory formerly referenced by the |
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Revision: 201003
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parents:
diff
changeset
|
365 |
* handle has been freed. |
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Revision: 201003
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parents:
diff
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|
366 |
* |
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Revision: 201003
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parents:
diff
changeset
|
367 |
* Results: |
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Revision: 201003
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diff
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|
368 |
* None. |
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|
369 |
* |
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Revision: 201003
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parents:
diff
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|
370 |
* Side effects: |
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Revision: 201003
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parents:
diff
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|
371 |
* If nothing is referring to the handle, the handle will be reclaimed. |
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Revision: 201003
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parents:
diff
changeset
|
372 |
* |
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Revision: 201003
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parents:
diff
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|
373 |
*--------------------------------------------------------------------------- |
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|
374 |
*/ |
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diff
changeset
|
375 |
|
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Revision: 201003
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|
376 |
void |
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Revision: 201003
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|
377 |
TclHandleFree(handle) |
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Revision: 201003
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|
378 |
TclHandle handle; /* Previously created handle associated |
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Revision: 201003
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parents:
diff
changeset
|
379 |
* with a malloc'd block that is being |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
380 |
* deleted. The handle is modified so that |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
381 |
* doubly dereferencing it will give NULL. */ |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
382 |
{ |
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Revision: 201003
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parents:
diff
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|
383 |
HandleStruct *handlePtr; |
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Revision: 201003
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parents:
diff
changeset
|
384 |
|
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Revision: 201003
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diff
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|
385 |
handlePtr = (HandleStruct *) handle; |
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Revision: 201003
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parents:
diff
changeset
|
386 |
#ifdef TCL_MEM_DEBUG |
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Revision: 201003
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|
387 |
if (handlePtr->refCount == 0x61616161) { |
08ec8eefde2f
Revision: 201003
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parents:
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|
388 |
panic("using previously disposed TclHandle %x", handlePtr); |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
389 |
} |
08ec8eefde2f
Revision: 201003
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parents:
diff
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|
390 |
if (handlePtr->ptr2 != handlePtr->ptr) { |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
391 |
panic("someone has changed the block referenced by the handle %x\nfrom %x to %x", |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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|
392 |
handlePtr, handlePtr->ptr2, handlePtr->ptr); |
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Revision: 201003
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parents:
diff
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|
393 |
} |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
394 |
#endif |
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Revision: 201003
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parents:
diff
changeset
|
395 |
handlePtr->ptr = NULL; |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
396 |
if (handlePtr->refCount == 0) { |
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Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
397 |
ckfree((char *) handlePtr); |
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Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
398 |
} |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
399 |
} |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
400 |
|
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
401 |
/* |
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Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
402 |
*--------------------------------------------------------------------------- |
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Revision: 201003
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parents:
diff
changeset
|
403 |
* |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
404 |
* TclHandlePreserve -- |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
405 |
* |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
406 |
* Declare an interest in the arbitrary malloc'd block associated |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
407 |
* with the handle. |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
408 |
* |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
409 |
* Results: |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
410 |
* The return value is the handle argument, with its ref count |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
411 |
* incremented. |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
412 |
* |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
413 |
* Side effects: |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
414 |
* For each call to TclHandlePreserve(), there should be a matching |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
415 |
* call to TclHandleRelease() when the caller is no longer interested |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
416 |
* in the malloc'd block associated with the handle. |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
417 |
* |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
418 |
*--------------------------------------------------------------------------- |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
419 |
*/ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
420 |
|
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Revision: 201003
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TclHandle |
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TclHandlePreserve(handle) |
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TclHandle handle; /* Declare an interest in the block of |
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* memory referenced by this handle. */ |
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425 |
{ |
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HandleStruct *handlePtr; |
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427 |
|
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handlePtr = (HandleStruct *) handle; |
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#ifdef TCL_MEM_DEBUG |
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if (handlePtr->refCount == 0x61616161) { |
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panic("using previously disposed TclHandle %x", handlePtr); |
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} |
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if ((handlePtr->ptr != NULL) |
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&& (handlePtr->ptr != handlePtr->ptr2)) { |
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panic("someone has changed the block referenced by the handle %x\nfrom %x to %x", |
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handlePtr, handlePtr->ptr2, handlePtr->ptr); |
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} |
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#endif |
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handlePtr->refCount++; |
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440 |
|
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return handle; |
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} |
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443 |
|
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/* |
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*--------------------------------------------------------------------------- |
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* |
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* TclHandleRelease -- |
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* |
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* This procedure is called to release an interest in the malloc'd |
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* block associated with the handle. |
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* |
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* Results: |
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* None. |
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* |
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* Side effects: |
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* The ref count of the handle is decremented. If the malloc'd block |
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* has been freed and if no one is using the handle any more, the |
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* handle will be reclaimed. |
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* |
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*--------------------------------------------------------------------------- |
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*/ |
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462 |
|
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void |
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TclHandleRelease(handle) |
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TclHandle handle; /* Unregister interest in the block of |
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* memory referenced by this handle. */ |
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{ |
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HandleStruct *handlePtr; |
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|
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handlePtr = (HandleStruct *) handle; |
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#ifdef TCL_MEM_DEBUG |
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if (handlePtr->refCount == 0x61616161) { |
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panic("using previously disposed TclHandle %x", handlePtr); |
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} |
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if ((handlePtr->ptr != NULL) |
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&& (handlePtr->ptr != handlePtr->ptr2)) { |
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panic("someone has changed the block referenced by the handle %x\nfrom %x to %x", |
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handlePtr, handlePtr->ptr2, handlePtr->ptr); |
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} |
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#endif |
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handlePtr->refCount--; |
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if ((handlePtr->refCount == 0) && (handlePtr->ptr == NULL)) { |
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ckfree((char *) handlePtr); |
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} |
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} |
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486 |