Initial commit of upstream NSPR (4.7.3) and NSS3 (3.12).

third_party/nspr/mozilla/nsprpub/lib/msgc/src/unixgc.c

Index: third_party/nspr/mozilla/nsprpub/lib/msgc/src/unixgc.c
diff --git a/third_party/nspr/mozilla/nsprpub/lib/msgc/src/unixgc.c b/third_party/nspr/mozilla/nsprpub/lib/msgc/src/unixgc.c
new file mode 100644
index 0000000000000000000000000000000000000000..cea4225ebee6003257e40faefa8122b14c688450
--- /dev/null
+++ b/third_party/nspr/mozilla/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);
+	}
+}