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/* -*- 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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* 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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* 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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* The Original Code is the Netscape Portable Runtime (NSPR).
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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) 1998-2000
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* the Initial Developer. All Rights Reserved.
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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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* ***** END LICENSE BLOCK ***** */
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#include <sys/types.h>
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#define _PR_GC_VMBASE 0x40000000
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#define _MD_MMAP_FLAGS MAP_SHARED
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#elif defined(RELIANTUNIX)
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#define _MD_MMAP_FLAGS MAP_PRIVATE|MAP_FIXED
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#define _MD_MMAP_FLAGS MAP_PRIVATE
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static PRInt32 zero_fd = -1;
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static PRLock *zero_fd_lock = NULL;
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* Disable using mmap(2) if NSPR_NO_MMAP is set
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if (getenv("NSPR_NO_MMAP")) {
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zero_fd = open("/dev/zero",O_RDWR , 0);
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zero_fd_lock = PR_NewLock();
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/* This static variable is used by _MD_GrowGCHeap and _MD_ExtendGCHeap */
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static void *lastaddr = (void*) _PR_GC_VMBASE;
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void *_MD_GrowGCHeap(PRUint32 *sizep)
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PR_Lock(zero_fd_lock);
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/* Extend the mapping */
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addr = mmap(lastaddr, size, PROT_READ|PROT_WRITE|PROT_EXEC,
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if (addr == (void*)-1) {
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lastaddr = ((char*)addr + size);
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PR_LOG(_pr_msgc_lm, PR_LOG_WARNING,
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("GC: heap extends from %08x to %08x\n",
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_PR_GC_VMBASE + (char*)lastaddr - (char*)_PR_GC_VMBASE));
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PR_Unlock(zero_fd_lock);
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PR_Unlock(zero_fd_lock);
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return PR_MALLOC(size);
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/* XXX - This is disabled. MAP_FIXED just does not work. */
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PRBool _MD_ExtendGCHeap(char *base, PRInt32 oldSize, PRInt32 newSize) {
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PRBool rv = PR_FALSE;
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PRInt32 allocSize = newSize - oldSize;
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PR_Lock(zero_fd_lock);
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addr = mmap(base + oldSize, allocSize, PROT_READ|PROT_WRITE|PROT_EXEC,
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_MD_MMAP_FLAGS | MAP_FIXED, zero_fd, 0);
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if (addr == (void*)-1) {
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if (addr != (void*) (base + oldSize)) {
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munmap(base + oldSize, allocSize);
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lastaddr = ((char*)base + newSize);
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PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS,
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("GC: heap now extends from %p to %p",
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base, base + newSize));
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PR_Unlock(zero_fd_lock);
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PRBool _MD_ExtendGCHeap(char *base, PRInt32 oldSize, PRInt32 newSize) {
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void _MD_FreeGCSegment(void *base, PRInt32 len)
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(void) munmap(base, len);
added
removed
mozilla/nsprpub/lib/msgc/src/unixgc.c
