1/*
2 * Copyright (c) 2015, 2018, 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#ifndef SHARE_GC_Z_ZLOCK_INLINE_HPP
25#define SHARE_GC_Z_ZLOCK_INLINE_HPP
26
27#include "gc/z/zLock.hpp"
28#include "runtime/atomic.hpp"
29#include "runtime/thread.hpp"
30#include "utilities/debug.hpp"
31
32inline ZLock::ZLock() {
33 pthread_mutex_init(&_lock, NULL);
34}
35
36inline ZLock::~ZLock() {
37 pthread_mutex_destroy(&_lock);
38}
39
40inline void ZLock::lock() {
41 pthread_mutex_lock(&_lock);
42}
43
44inline bool ZLock::try_lock() {
45 return pthread_mutex_trylock(&_lock) == 0;
46}
47
48inline void ZLock::unlock() {
49 pthread_mutex_unlock(&_lock);
50}
51
52inline ZReentrantLock::ZReentrantLock() :
53 _lock(),
54 _owner(NULL),
55 _count(0) {}
56
57inline void ZReentrantLock::lock() {
58 Thread* const thread = Thread::current();
59 Thread* const owner = Atomic::load(&_owner);
60
61 if (owner != thread) {
62 _lock.lock();
63 Atomic::store(thread, &_owner);
64 }
65
66 _count++;
67}
68
69inline void ZReentrantLock::unlock() {
70 assert(is_owned(), "Invalid owner");
71 assert(_count > 0, "Invalid count");
72
73 _count--;
74
75 if (_count == 0) {
76 Atomic::store((Thread*)NULL, &_owner);
77 _lock.unlock();
78 }
79}
80
81inline bool ZReentrantLock::is_owned() const {
82 Thread* const thread = Thread::current();
83 Thread* const owner = Atomic::load(&_owner);
84 return owner == thread;
85}
86
87template <typename T>
88inline ZLocker<T>::ZLocker(T* lock) :
89 _lock(lock) {
90 _lock->lock();
91}
92
93template <typename T>
94inline ZLocker<T>::~ZLocker() {
95 _lock->unlock();
96}
97
98#endif // SHARE_GC_Z_ZLOCK_INLINE_HPP
99