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_HPP
25 #define SHARE_GC_Z_ZLOCK_HPP
26 
27 #include "memory/allocation.hpp"
28 #include <pthread.h>
29 
30 class ZLock {
31 private:
32   pthread_mutex_t _lock;
33 
34 public:
35   ZLock();
36 
37   virtual void lock();
38   virtual bool try_lock();
39   virtual void unlock();
40 };
41 
42 class ZLocker : public StackObj {
43 private:
44   ZLock* const _lock;
45 
46 public:
47   ZLocker(ZLock* lock);
48   ~ZLocker();
49 };
50 
51 class ZReentrantLock: public ZLock {
52   Thread* volatile _owner;
53 
54 public:
55   ZReentrantLock();
56 
57   virtual void lock();
58   virtual bool try_lock();
59   virtual void unlock();
60 
61   bool is_owned() const;
62   bool reentrant_lock();
63 };
64 
65 #endif // SHARE_GC_Z_ZLOCK_HPP