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