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hotspot/src/os/solaris/vm/threadCritical_solaris.cpp

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+/*
+ * Copyright 2001-2003 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_solaris.cpp.incl"
+
+// OS-includes here
+#include <thread.h>
+#include <synch.h>
+
+//
+// See threadCritical.hpp for details of this class.
+//
+// For some reason, we don't do locking until the
+// os::init() call completes. I'm not sure why this
+// is, and have left it that way for now. This should
+// be reviewed later.
+
+static  mutex_t  global_mut;
+static  thread_t global_mut_owner = -1;
+static  int      global_mut_count = 0;
+static  bool     initialized = false;
+
+ThreadCritical::ThreadCritical() {
+  if (initialized) {
+    thread_t owner = thr_self();
+    if (global_mut_owner != owner) {
+      if (os::Solaris::mutex_lock(&global_mut))
+        fatal1("ThreadCritical::ThreadCritical: mutex_lock failed (%s)", strerror(errno));
+      assert(global_mut_count == 0, "must have clean count");
+      assert(global_mut_owner == -1, "must have clean owner");
+    }
+    global_mut_owner = owner;
+    ++global_mut_count;
+  } else {
+    assert (Threads::number_of_threads() == 0, "valid only during initialization");
+  }
+}
+
+ThreadCritical::~ThreadCritical() {
+  if (initialized) {
+    assert(global_mut_owner == thr_self(), "must have correct owner");
+    assert(global_mut_count > 0, "must have correct count");
+    --global_mut_count;
+    if (global_mut_count == 0) {
+      global_mut_owner = -1;
+      if (os::Solaris::mutex_unlock(&global_mut))
+        fatal1("ThreadCritical::~ThreadCritical: mutex_unlock failed (%s)", strerror(errno));
+    }
+  } else {
+    assert (Threads::number_of_threads() == 0, "valid only during initialization");
+  }
+}
+
+void ThreadCritical::initialize() {
+  // This method is called at the end of os::init(). Until
+  // then, we don't do real locking.
+  initialized = true;
+}
+
+void ThreadCritical::release() {
+}