1/*
2 * Copyright (c) 2001, 2010, 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/thread.inline.hpp"
27#include "runtime/threadCritical.hpp"
28
29// put OS-includes here
30# include <pthread.h>
31
32//
33// See threadCritical.hpp for details of this class.
34//
35
36static pthread_t tc_owner = 0;
37static pthread_mutex_t tc_mutex = PTHREAD_MUTEX_INITIALIZER;
38static int tc_count = 0;
39
40ThreadCritical::ThreadCritical() {
41 pthread_t self = pthread_self();
42 if (self != tc_owner) {
43 int ret = pthread_mutex_lock(&tc_mutex);
44 guarantee(ret == 0, "fatal error with pthread_mutex_lock()");
45 assert(tc_count == 0, "Lock acquired with illegal reentry count.");
46 tc_owner = self;
47 }
48 tc_count++;
49}
50
51ThreadCritical::~ThreadCritical() {
52 assert(tc_owner == pthread_self(), "must have correct owner");
53 assert(tc_count > 0, "must have correct count");
54
55 tc_count--;
56 if (tc_count == 0) {
57 tc_owner = 0;
58 int ret = pthread_mutex_unlock(&tc_mutex);
59 guarantee(ret == 0, "fatal error with pthread_mutex_unlock()");
60 }
61}
62