|
1 /* |
|
2 * Copyright (c) 2015, 2016, 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 #ifndef SHARE_VM_RUNTIME_SEMAPHORE_HPP |
|
26 #define SHARE_VM_RUNTIME_SEMAPHORE_HPP |
|
27 |
|
28 #include "memory/allocation.hpp" |
|
29 |
|
30 #if defined(LINUX) || defined(SOLARIS) || defined(AIX) |
|
31 # include "semaphore_posix.hpp" |
|
32 #elif defined(BSD) |
|
33 # include "semaphore_bsd.hpp" |
|
34 #elif defined(_WINDOWS) |
|
35 # include "semaphore_windows.hpp" |
|
36 #else |
|
37 # error "No semaphore implementation provided for this OS" |
|
38 #endif |
|
39 |
|
40 class JavaThread; |
|
41 |
|
42 // Implements the limited, platform independent Semaphore API. |
|
43 class Semaphore : public CHeapObj<mtInternal> { |
|
44 SemaphoreImpl _impl; |
|
45 |
|
46 // Prevent copying and assignment of Semaphore instances. |
|
47 Semaphore(const Semaphore&); |
|
48 Semaphore& operator=(const Semaphore&); |
|
49 |
|
50 public: |
|
51 Semaphore(uint value = 0) : _impl(value) {} |
|
52 ~Semaphore() {} |
|
53 |
|
54 void signal(uint count = 1) { _impl.signal(count); } |
|
55 |
|
56 void wait() { _impl.wait(); } |
|
57 |
|
58 bool trywait() { return _impl.trywait(); } |
|
59 |
|
60 void wait_with_safepoint_check(JavaThread* thread); |
|
61 }; |
|
62 |
|
63 #endif // SHARE_VM_RUNTIME_SEMAPHORE_HPP |