--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/os/linux/vm/threadCritical_linux.cpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2001-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_threadCritical_linux.cpp.incl"
+
+// put OS-includes here
+# include <pthread.h>
+
+//
+// See threadCritical.hpp for details of this class.
+//
+
+static pthread_t             tc_owner = 0;
+static pthread_mutex_t       tc_mutex = PTHREAD_MUTEX_INITIALIZER;
+static int                   tc_count = 0;
+
+void ThreadCritical::initialize() {
+}
+
+void ThreadCritical::release() {
+}
+
+ThreadCritical::ThreadCritical() {
+  pthread_t self = pthread_self();
+  if (self != tc_owner) {
+    int ret = pthread_mutex_lock(&tc_mutex);
+    guarantee(ret == 0, "fatal error with pthread_mutex_lock()");
+    assert(tc_count == 0, "Lock acquired with illegal reentry count.");
+    tc_owner = self;
+  }
+  tc_count++;
+}
+
+ThreadCritical::~ThreadCritical() {
+  assert(tc_owner == pthread_self(), "must have correct owner");
+  assert(tc_count > 0, "must have correct count");
+
+  tc_count--;
+  if (tc_count == 0) {
+    tc_owner = 0;
+    int ret = pthread_mutex_unlock(&tc_mutex);
+    guarantee(ret == 0, "fatal error with pthread_mutex_unlock()");
+  }
+}