mirror of
https://github.com/mozilla/gecko-dev.git
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104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Allocator for zlib optimized for mozilla's use
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*
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*/
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#define NBUCKETS 6
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#define BY4ALLOC_ITEMS 320
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class nsZlibAllocator;
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extern nsZlibAllocator *gZlibAllocator;
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class nsZlibAllocator {
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public:
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struct nsMemBucket {
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void *ptr;
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PRUint32 size;
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// Is this bucket available ?
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// 1 : free
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// 0 or negative : in use
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// This is an int because we use atomic inc/dec to operate on it
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PRInt32 available;
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};
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nsMemBucket mMemBucket[NBUCKETS];
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nsZlibAllocator() {
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memset(mMemBucket, 0, sizeof(mMemBucket));
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for (PRUint32 i = 0; i < NBUCKETS; i++)
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mMemBucket[i].available = 1;
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return;
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}
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~nsZlibAllocator() {
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for (PRUint32 i = 0; i < NBUCKETS; i++)
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{
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PRBool claimed = Claim(i);
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// ASSERT that we claimed the bucked. If we cannot, then the bucket is in use.
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// We dont attempt to free this ptr.
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// This will most likely cause a leak of this memory.
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PR_ASSERT(claimed);
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// Free bucket memory if not in use
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if (claimed && mMemBucket[i].ptr)
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free(mMemBucket[i].ptr);
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}
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}
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// zlib allocators
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void* zAlloc(PRUint32 items, PRUint32 size);
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void zFree(void *ptr);
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// Bucket handling.
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PRBool Claim(PRUint32 i) {
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PRBool claimed = (PR_AtomicDecrement(&mMemBucket[i].available) == 0);
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// Undo the claim, if claim failed
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if (!claimed)
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Unclaim(i);
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return claimed;
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}
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void Unclaim(PRUint32 i) { PR_AtomicIncrement(&mMemBucket[i].available); }
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};
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