1/*
2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2014 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26#include "precompiled.hpp"
27#include "runtime/threadCritical.hpp"
28#include "runtime/thread.inline.hpp"
29
30// put OS-includes here
31# include <pthread.h>
32
33//
34// See threadCritical.hpp for details of this class.
35//
36
37static pthread_t             tc_owner = 0;
38static pthread_mutex_t       tc_mutex = PTHREAD_MUTEX_INITIALIZER;
39static int                   tc_count = 0;
40
41void ThreadCritical::initialize() {
42}
43
44void ThreadCritical::release() {
45}
46
47ThreadCritical::ThreadCritical() {
48  pthread_t self = pthread_self();
49  if (self != tc_owner) {
50    int ret = pthread_mutex_lock(&tc_mutex);
51    guarantee(ret == 0, "fatal error with pthread_mutex_lock()");
52    assert(tc_count == 0, "Lock acquired with illegal reentry count.");
53    tc_owner = self;
54  }
55  tc_count++;
56}
57
58ThreadCritical::~ThreadCritical() {
59  assert(tc_owner == pthread_self(), "must have correct owner");
60  assert(tc_count > 0, "must have correct count");
61
62  tc_count--;
63  if (tc_count == 0) {
64    tc_owner = 0;
65    int ret = pthread_mutex_unlock(&tc_mutex);
66    guarantee(ret == 0, "fatal error with pthread_mutex_unlock()");
67  }
68}
69