1 /*
2 * Copyright (c) 2012, 2020, 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(&_suspend_flags, flags, (flags | f)) != 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(&_suspend_flags, flags, (flags & ~f)) != 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 = Atomic::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(&_threads_hazard_ptr, compare_value, exchange_value);
93 }
94
95 inline ThreadsList* Thread::get_threads_hazard_ptr() {
96 return (ThreadsList*)Atomic::load_acquire(&_threads_hazard_ptr);
97 }
98
99 inline void Thread::set_threads_hazard_ptr(ThreadsList* new_list) {
100 Atomic::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) Atomic::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 assert(current_or_null() == NULL || current_or_null() == this,
135 "state change should only be called by the current thread");
136 #if defined(PPC64) || defined (AARCH64)
137 // Use membars when accessing volatile _thread_state. See
138 // Threads::create_vm() for size checks.
139 Atomic::release_store((volatile jint*)&_thread_state, (jint)s);
140 #else
141 _thread_state = s;
142 #endif
143 }
144
145 inline void JavaThread::set_thread_state_fence(JavaThreadState s) {
146 set_thread_state(s);
147 OrderAccess::fence();
148 }
149
150 ThreadSafepointState* JavaThread::safepoint_state() const {
151 return _safepoint_state;
152 }
153
154 void JavaThread::set_safepoint_state(ThreadSafepointState *state) {
155 _safepoint_state = state;
156 }
157
158 bool JavaThread::is_at_poll_safepoint() {
159 return _safepoint_state->is_at_poll_safepoint();
160 }
161
162 void JavaThread::enter_critical() {
163 assert(Thread::current() == this ||
164 (Thread::current()->is_VM_thread() &&
165 SafepointSynchronize::is_synchronizing()),
166 "this must be current thread or synchronizing");
167 _jni_active_critical++;
168 }
169
170 inline void JavaThread::set_done_attaching_via_jni() {
171 _jni_attach_state = _attached_via_jni;
172 OrderAccess::fence();
173 }
174
175 inline bool JavaThread::stack_guard_zone_unused() {
176 return _stack_guard_state == stack_guard_unused;
177 }
178
179 inline bool JavaThread::stack_yellow_reserved_zone_disabled() {
180 return _stack_guard_state == stack_guard_yellow_reserved_disabled;
181 }
182
183 inline bool JavaThread::stack_reserved_zone_disabled() {
184 return _stack_guard_state == stack_guard_reserved_disabled;
185 }
186
187 inline size_t JavaThread::stack_available(address cur_sp) {
188 // This code assumes java stacks grow down
189 address low_addr; // Limit on the address for deepest stack depth
190 if (_stack_guard_state == stack_guard_unused) {
191 low_addr = stack_end();
192 } else {
193 low_addr = stack_reserved_zone_base();
194 }
195 return cur_sp > low_addr ? cur_sp - low_addr : 0;
196 }
197
198 inline bool JavaThread::stack_guards_enabled() {
199 #ifdef ASSERT
200 if (os::uses_stack_guard_pages() &&
201 !(DisablePrimordialThreadGuardPages && os::is_primordial_thread())) {
202 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
203 }
204 #endif
205 return _stack_guard_state == stack_guard_enabled;
206 }
207
208 // The release make sure this store is done after storing the handshake
209 // operation or global state
210 inline void JavaThread::set_polling_page_release(void* poll_value) {
211 Atomic::release_store(polling_page_addr(), poll_value);
212 }
213
214 // Caller is responsible for using a memory barrier if needed.
215 inline void JavaThread::set_polling_page(void* poll_value) {
216 *polling_page_addr() = poll_value;
217 }
218
219 // The aqcquire make sure reading of polling page is done before
220 // the reading the handshake operation or the global state
221 inline volatile void* JavaThread::get_polling_page() {
222 return Atomic::load_acquire(polling_page_addr());
223 }
224
225 inline bool JavaThread::is_exiting() const {
226 // Use load-acquire so that setting of _terminated by
227 // JavaThread::exit() is seen more quickly.
228 TerminatedTypes l_terminated = (TerminatedTypes)
229 Atomic::load_acquire((volatile jint *) &_terminated);
230 return l_terminated == _thread_exiting || check_is_terminated(l_terminated);
231 }
232
233 inline bool JavaThread::is_terminated() const {
234 // Use load-acquire so that setting of _terminated by
235 // JavaThread::exit() is seen more quickly.
236 TerminatedTypes l_terminated = (TerminatedTypes)
237 Atomic::load_acquire((volatile jint *) &_terminated);
238 return check_is_terminated(l_terminated);
239 }
240
241 inline void JavaThread::set_terminated(TerminatedTypes t) {
242 // use release-store so the setting of _terminated is seen more quickly
243 Atomic::release_store((volatile jint *) &_terminated, (jint) t);
244 }
245
246 // special for Threads::remove() which is static:
247 inline void JavaThread::set_terminated_value() {
248 // use release-store so the setting of _terminated is seen more quickly
249 Atomic::release_store((volatile jint *) &_terminated, (jint) _thread_terminated);
250 }
251
252 // Allow tracking of class initialization monitor use
253 inline void JavaThread::set_class_to_be_initialized(InstanceKlass* k) {
254 assert((k == NULL && _class_to_be_initialized != NULL) ||
255 (k != NULL && _class_to_be_initialized == NULL), "incorrect usage");
256 assert(this == Thread::current(), "Only the current thread can set this field");
257 _class_to_be_initialized = k;
258 }
259
260 inline InstanceKlass* JavaThread::class_to_be_initialized() const {
261 return _class_to_be_initialized;
262 }
263
264 #endif // SHARE_RUNTIME_THREAD_INLINE_HPP