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
37 static pthread_t tc_owner = 0;
38 static pthread_mutex_t tc_mutex = PTHREAD_MUTEX_INITIALIZER;
39 static int tc_count = 0;
40
ThreadCritical()41 ThreadCritical::ThreadCritical() {
42 pthread_t self = pthread_self();
43 if (self != tc_owner) {
44 int ret = pthread_mutex_lock(&tc_mutex);
45 guarantee(ret == 0, "fatal error with pthread_mutex_lock()");
46 assert(tc_count == 0, "Lock acquired with illegal reentry count.");
47 tc_owner = self;
48 }
49 tc_count++;
50 }
51
~ThreadCritical()52 ThreadCritical::~ThreadCritical() {
53 assert(tc_owner == pthread_self(), "must have correct owner");
54 assert(tc_count > 0, "must have correct count");
55
56 tc_count--;
57 if (tc_count == 0) {
58 tc_owner = 0;
59 int ret = pthread_mutex_unlock(&tc_mutex);
60 guarantee(ret == 0, "fatal error with pthread_mutex_unlock()");
61 }
62 }
63