diff options
Diffstat (limited to 'src/libs/xpcom18a4/nsprpub/lib/msgc/src/unixgc.c')
| -rw-r--r-- | src/libs/xpcom18a4/nsprpub/lib/msgc/src/unixgc.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/nsprpub/lib/msgc/src/unixgc.c b/src/libs/xpcom18a4/nsprpub/lib/msgc/src/unixgc.c new file mode 100644 index 00000000..cea4225e --- /dev/null +++ b/src/libs/xpcom18a4/nsprpub/lib/msgc/src/unixgc.c @@ -0,0 +1,155 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is the Netscape Portable Runtime (NSPR). + * + * The Initial Developer of the Original Code is + * Netscape Communications Corporation. + * Portions created by the Initial Developer are Copyright (C) 1998-2000 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +#include "prlock.h" +#include "prlog.h" +#include "prmem.h" +#include "gcint.h" + +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <sys/mman.h> + +#define _PR_GC_VMBASE 0x40000000 + +#if defined(SOLARIS) +#define _MD_MMAP_FLAGS MAP_SHARED +#elif defined(RELIANTUNIX) +#define _MD_MMAP_FLAGS MAP_PRIVATE|MAP_FIXED +#else +#define _MD_MMAP_FLAGS MAP_PRIVATE +#endif + +static PRInt32 zero_fd = -1; +static PRLock *zero_fd_lock = NULL; + +void _MD_InitGC(void) +{ +#ifdef DEBUG + /* + * Disable using mmap(2) if NSPR_NO_MMAP is set + */ + if (getenv("NSPR_NO_MMAP")) { + zero_fd = -2; + return; + } +#endif + zero_fd = open("/dev/zero",O_RDWR , 0); + zero_fd_lock = PR_NewLock(); +} + +/* This static variable is used by _MD_GrowGCHeap and _MD_ExtendGCHeap */ +static void *lastaddr = (void*) _PR_GC_VMBASE; + +void *_MD_GrowGCHeap(PRUint32 *sizep) +{ + void *addr; + PRUint32 size; + + size = *sizep; + + PR_Lock(zero_fd_lock); + if (zero_fd < 0) { + goto mmap_loses; + } + + /* Extend the mapping */ + addr = mmap(lastaddr, size, PROT_READ|PROT_WRITE|PROT_EXEC, + _MD_MMAP_FLAGS, + zero_fd, 0); + if (addr == (void*)-1) { + zero_fd = -1; + goto mmap_loses; + } + lastaddr = ((char*)addr + size); +#ifdef DEBUG + PR_LOG(_pr_msgc_lm, PR_LOG_WARNING, + ("GC: heap extends from %08x to %08x\n", + _PR_GC_VMBASE, + _PR_GC_VMBASE + (char*)lastaddr - (char*)_PR_GC_VMBASE)); +#endif + PR_Unlock(zero_fd_lock); + return addr; + +mmap_loses: + PR_Unlock(zero_fd_lock); + return PR_MALLOC(size); +} + +/* XXX - This is disabled. MAP_FIXED just does not work. */ +#if 0 +PRBool _MD_ExtendGCHeap(char *base, PRInt32 oldSize, PRInt32 newSize) { + PRBool rv = PR_FALSE; + void* addr; + PRInt32 allocSize = newSize - oldSize; + + PR_Lock(zero_fd_lock); + addr = mmap(base + oldSize, allocSize, PROT_READ|PROT_WRITE|PROT_EXEC, + _MD_MMAP_FLAGS | MAP_FIXED, zero_fd, 0); + if (addr == (void*)-1) { + goto loser; + } + if (addr != (void*) (base + oldSize)) { + munmap(base + oldSize, allocSize); + goto loser; + } + lastaddr = ((char*)base + newSize); + PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS, + ("GC: heap now extends from %p to %p", + base, base + newSize)); + rv = PR_TRUE; + +loser: + PR_Unlock(zero_fd_lock); + return rv; +} +#else +PRBool _MD_ExtendGCHeap(char *base, PRInt32 oldSize, PRInt32 newSize) { + return PR_FALSE; +} +#endif + +void _MD_FreeGCSegment(void *base, PRInt32 len) +{ + if (zero_fd < 0) { + PR_DELETE(base); + } else { + (void) munmap(base, len); + } +} |