1/*
2 * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "runtime/os.hpp"
27#include "runtime/thread.inline.hpp"
28#include "runtime/threadCritical.hpp"
29
30// OS-includes here
31#include <thread.h>
32#include <synch.h>
33
34//
35// See threadCritical.hpp for details of this class.
36//
37// For some reason, we don't do locking until the
38// os::init() call completes. I'm not sure why this
39// is, and have left it that way for now. This should
40// be reviewed later.
41
42static  mutex_t  global_mut;
43static  thread_t global_mut_owner = -1;
44static  int      global_mut_count = 0;
45static  bool     initialized = false;
46
47ThreadCritical::ThreadCritical() {
48  if (initialized) {
49    thread_t owner = thr_self();
50    if (global_mut_owner != owner) {
51      if (os::Solaris::mutex_lock(&global_mut))
52        fatal("ThreadCritical::ThreadCritical: mutex_lock failed (%s)",
53              os::strerror(errno));
54      assert(global_mut_count == 0, "must have clean count");
55      assert(global_mut_owner == -1, "must have clean owner");
56    }
57    global_mut_owner = owner;
58    ++global_mut_count;
59  } else {
60    assert (Threads::number_of_threads() == 0, "valid only during initialization");
61  }
62}
63
64ThreadCritical::~ThreadCritical() {
65  if (initialized) {
66    assert(global_mut_owner == thr_self(), "must have correct owner");
67    assert(global_mut_count > 0, "must have correct count");
68    --global_mut_count;
69    if (global_mut_count == 0) {
70      global_mut_owner = -1;
71      if (os::Solaris::mutex_unlock(&global_mut))
72        fatal("ThreadCritical::~ThreadCritical: mutex_unlock failed (%s)", os::strerror(errno));
73    }
74  } else {
75    assert (Threads::number_of_threads() == 0, "valid only during initialization");
76  }
77}
78
79void ThreadCritical::initialize() {
80  // This method is called at the end of os::init(). Until
81  // then, we don't do real locking.
82  initialized = true;
83}
84
85void ThreadCritical::release() {
86}
87