|
1 /* |
|
2 * Copyright (c) 2017, 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_SAFEPOINTMECHANISM_INLINE_HPP |
|
26 #define SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_INLINE_HPP |
|
27 |
|
28 #include "runtime/safepointMechanism.hpp" |
|
29 #include "runtime/safepoint.hpp" |
|
30 #include "runtime/thread.inline.hpp" |
|
31 |
|
32 bool SafepointMechanism::local_poll_armed(JavaThread* thread) { |
|
33 const intptr_t poll_word = reinterpret_cast<intptr_t>(thread->get_polling_page()); |
|
34 return mask_bits_are_true(poll_word, poll_bit()); |
|
35 } |
|
36 |
|
37 bool SafepointMechanism::global_poll() { |
|
38 return SafepointSynchronize::do_call_back(); |
|
39 } |
|
40 |
|
41 bool SafepointMechanism::local_poll(Thread* thread) { |
|
42 if (thread->is_Java_thread()) { |
|
43 return local_poll_armed((JavaThread*)thread); |
|
44 } else { |
|
45 // If the poll is on a non-java thread we can only check the global state. |
|
46 return global_poll(); |
|
47 } |
|
48 } |
|
49 |
|
50 bool SafepointMechanism::poll(Thread* thread) { |
|
51 if (uses_thread_local_poll()) { |
|
52 return local_poll(thread); |
|
53 } else { |
|
54 return global_poll(); |
|
55 } |
|
56 } |
|
57 |
|
58 void SafepointMechanism::block_if_requested_local_poll(JavaThread *thread) { |
|
59 bool armed = local_poll_armed(thread); // load acquire, polling page -> op / global state |
|
60 if(armed) { |
|
61 // We could be armed for either a handshake operation or a safepoint |
|
62 if (thread->has_handshake()) { |
|
63 thread->handshake_process_by_self(); |
|
64 } else { |
|
65 if (global_poll()) { |
|
66 SafepointSynchronize::block(thread); |
|
67 } |
|
68 } |
|
69 } |
|
70 } |
|
71 |
|
72 void SafepointMechanism::block_if_requested(JavaThread *thread) { |
|
73 if (uses_thread_local_poll()) { |
|
74 block_if_requested_local_poll(thread); |
|
75 } else { |
|
76 // If we don't have per thread poll this could a handshake or a safepoint |
|
77 if (global_poll()) { |
|
78 SafepointSynchronize::block(thread); |
|
79 } |
|
80 } |
|
81 } |
|
82 |
|
83 void SafepointMechanism::arm_local_poll(JavaThread* thread) { |
|
84 thread->set_polling_page(poll_armed_value()); |
|
85 } |
|
86 |
|
87 void SafepointMechanism::disarm_local_poll(JavaThread* thread) { |
|
88 thread->set_polling_page(poll_disarmed_value()); |
|
89 } |
|
90 |
|
91 #endif // SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_INLINE_HPP |