1 /*
2 * Copyright (c) 2012, 2019, 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_RUNTIME_THREAD_INLINE_HPP
26 #define SHARE_RUNTIME_THREAD_INLINE_HPP
27
28 #include "runtime/atomic.hpp"
29 #include "runtime/globals.hpp"
30 #include "runtime/orderAccess.hpp"
31 #include "runtime/os.inline.hpp"
32 #include "runtime/safepoint.hpp"
33 #include "runtime/thread.hpp"
34
35 inline void Thread::set_suspend_flag(SuspendFlags f) {
36 uint32_t flags;
37 do {
38 flags = _suspend_flags;
39 }
40 while (Atomic::cmpxchg((flags | f), &_suspend_flags, flags) != flags);
41 }
42 inline void Thread::clear_suspend_flag(SuspendFlags f) {
43 uint32_t flags;
44 do {
45 flags = _suspend_flags;
46 }
47 while (Atomic::cmpxchg((flags & ~f), &_suspend_flags, flags) != flags);
48 }
49
50 inline void Thread::set_has_async_exception() {
51 set_suspend_flag(_has_async_exception);
52 }
53 inline void Thread::clear_has_async_exception() {
54 clear_suspend_flag(_has_async_exception);
55 }
56 inline void Thread::set_critical_native_unlock() {
57 set_suspend_flag(_critical_native_unlock);
58 }
59 inline void Thread::clear_critical_native_unlock() {
60 clear_suspend_flag(_critical_native_unlock);
61 }
62 inline void Thread::set_trace_flag() {
63 set_suspend_flag(_trace_flag);
64 }
65 inline void Thread::clear_trace_flag() {
66 clear_suspend_flag(_trace_flag);
67 }
68 inline void Thread::set_ea_obj_deopt_flag() {
69 set_suspend_flag(_ea_obj_deopt);
70 }
71 inline void Thread::clear_ea_obj_deopt_flag() {
72 clear_suspend_flag(_ea_obj_deopt);
73 }
74
75 inline jlong Thread::cooked_allocated_bytes() {
76 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);
77 if (UseTLAB) {
78 size_t used_bytes = tlab().used_bytes();
79 if (used_bytes <= ThreadLocalAllocBuffer::max_size_in_bytes()) {
80 // Comparing used_bytes with the maximum allowed size will ensure
81 // that we don't add the used bytes from a semi-initialized TLAB
82 // ending up with incorrect values. There is still a race between
83 // incrementing _allocated_bytes and clearing the TLAB, that might
84 // cause double counting in rare cases.
85 return allocated_bytes + used_bytes;
86 }
87 }
88 return allocated_bytes;
89 }
90
91 inline ThreadsList* Thread::cmpxchg_threads_hazard_ptr(ThreadsList* exchange_value, ThreadsList* compare_value) {
92 return (ThreadsList*)Atomic::cmpxchg(exchange_value, &_threads_hazard_ptr, compare_value);
93 }
94
95 inline ThreadsList* Thread::get_threads_hazard_ptr() {
96 return (ThreadsList*)OrderAccess::load_acquire(&_threads_hazard_ptr);
97 }
98
99 inline void Thread::set_threads_hazard_ptr(ThreadsList* new_list) {
100 OrderAccess::release_store_fence(&_threads_hazard_ptr, new_list);
101 }
102
103 inline void JavaThread::set_ext_suspended() {
104 set_suspend_flag (_ext_suspended);
105 }
106 inline void JavaThread::clear_ext_suspended() {
107 clear_suspend_flag(_ext_suspended);
108 }
109
110 inline void JavaThread::set_external_suspend() {
111 set_suspend_flag(_external_suspend);
112 }
113 inline void JavaThread::clear_external_suspend() {
114 clear_suspend_flag(_external_suspend);
115 }
116
117 inline void JavaThread::set_pending_async_exception(oop e) {
118 _pending_async_exception = e;
119 _special_runtime_exit_condition = _async_exception;
120 set_has_async_exception();
121 }
122
123 inline JavaThreadState JavaThread::thread_state() const {
124 #if defined(PPC64) || defined (AARCH64)
125 // Use membars when accessing volatile _thread_state. See
126 // Threads::create_vm() for size checks.
127 return (JavaThreadState) OrderAccess::load_acquire((volatile jint*)&_thread_state);
128 #else
129 return _thread_state;
130 #endif
131 }
132
133 inline void JavaThread::set_thread_state(JavaThreadState s) {
134 #if defined(PPC64) || defined (AARCH64)
135 // Use membars when accessing volatile _thread_state. See
136 // Threads::create_vm() for size checks.
137 OrderAccess::release_store((volatile jint*)&_thread_state, (jint)s);
138 #else
139 _thread_state = s;
140 #endif
141 }
142
143 inline void JavaThread::set_thread_state_fence(JavaThreadState s) {
144 set_thread_state(s);
145 OrderAccess::fence();
146 }
147
148 ThreadSafepointState* JavaThread::safepoint_state() const {
149 return _safepoint_state;
150 }
151
152 void JavaThread::set_safepoint_state(ThreadSafepointState *state) {
153 _safepoint_state = state;
154 }
155
156 bool JavaThread::is_at_poll_safepoint() {
157 return _safepoint_state->is_at_poll_safepoint();
158 }
159
160 void JavaThread::enter_critical() {
161 assert(Thread::current() == this ||
162 (Thread::current()->is_VM_thread() &&
163 SafepointSynchronize::is_synchronizing()),
164 "this must be current thread or synchronizing");
165 _jni_active_critical++;
166 }
167
168 inline void JavaThread::set_done_attaching_via_jni() {
169 _jni_attach_state = _attached_via_jni;
170 OrderAccess::fence();
171 }
172
173 inline bool JavaThread::stack_guard_zone_unused() {
174 return _stack_guard_state == stack_guard_unused;
175 }
176
177 inline bool JavaThread::stack_yellow_reserved_zone_disabled() {
178 return _stack_guard_state == stack_guard_yellow_reserved_disabled;
179 }
180
181 inline bool JavaThread::stack_reserved_zone_disabled() {
182 return _stack_guard_state == stack_guard_reserved_disabled;
183 }
184
185 inline size_t JavaThread::stack_available(address cur_sp) {
186 // This code assumes java stacks grow down
187 address low_addr; // Limit on the address for deepest stack depth
188 if (_stack_guard_state == stack_guard_unused) {
189 low_addr = stack_end();
190 } else {
191 low_addr = stack_reserved_zone_base();
192 }
193 return cur_sp > low_addr ? cur_sp - low_addr : 0;
194 }
195
196 inline bool JavaThread::stack_guards_enabled() {
197 #ifdef ASSERT
198 if (os::uses_stack_guard_pages() &&
199 !(DisablePrimordialThreadGuardPages && os::is_primordial_thread())) {
200 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
201 }
202 #endif
203 return _stack_guard_state == stack_guard_enabled;
204 }
205
206 // The release make sure this store is done after storing the handshake
207 // operation or global state
208 inline void JavaThread::set_polling_page_release(void* poll_value) {
209 OrderAccess::release_store(polling_page_addr(), poll_value);
210 }
211
212 // Caller is responsible for using a memory barrier if needed.
213 inline void JavaThread::set_polling_page(void* poll_value) {
214 *polling_page_addr() = poll_value;
215 }
216
217 // The aqcquire make sure reading of polling page is done before
218 // the reading the handshake operation or the global state
219 inline volatile void* JavaThread::get_polling_page() {
220 return OrderAccess::load_acquire(polling_page_addr());
221 }
222
223 inline bool JavaThread::is_exiting() const {
224 // Use load-acquire so that setting of _terminated by
225 // JavaThread::exit() is seen more quickly.
226 TerminatedTypes l_terminated = (TerminatedTypes)
227 OrderAccess::load_acquire((volatile jint *) &_terminated);
228 return l_terminated == _thread_exiting || check_is_terminated(l_terminated);
229 }
230
231 inline bool JavaThread::is_terminated() const {
232 // Use load-acquire so that setting of _terminated by
233 // JavaThread::exit() is seen more quickly.
234 TerminatedTypes l_terminated = (TerminatedTypes)
235 OrderAccess::load_acquire((volatile jint *) &_terminated);
236 return check_is_terminated(l_terminated);
237 }
238
239 inline void JavaThread::set_terminated(TerminatedTypes t) {
240 // use release-store so the setting of _terminated is seen more quickly
241 OrderAccess::release_store((volatile jint *) &_terminated, (jint) t);
242 }
243
244 // special for Threads::remove() which is static:
245 inline void JavaThread::set_terminated_value() {
246 // use release-store so the setting of _terminated is seen more quickly
247 OrderAccess::release_store((volatile jint *) &_terminated, (jint) _thread_terminated);
248 }
249
250 // Allow tracking of class initialization monitor use
251 inline void JavaThread::set_class_to_be_initialized(InstanceKlass* k) {
252 assert((k == NULL && _class_to_be_initialized != NULL) ||
253 (k != NULL && _class_to_be_initialized == NULL), "incorrect usage");
254 assert(this == Thread::current(), "Only the current thread can set this field");
255 _class_to_be_initialized = k;
256 }
257
258 inline InstanceKlass* JavaThread::class_to_be_initialized() const {
259 return _class_to_be_initialized;
260 }
261
262 #endif // SHARE_RUNTIME_THREAD_INLINE_HPP