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-rw-r--r--mozilla/nsprpub/lib/msgc/src/unixgc.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/mozilla/nsprpub/lib/msgc/src/unixgc.c b/mozilla/nsprpub/lib/msgc/src/unixgc.c
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+/* -*- 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);
+ }
+}