1 /*
  2  * Copyright (c) 2006, 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_PRIMS_JVMTITHREADSTATE_INLINE_HPP
 26 #define SHARE_PRIMS_JVMTITHREADSTATE_INLINE_HPP
 27 
 28 #include "prims/jvmtiEnvThreadState.hpp"
 29 
 30 #include "prims/jvmtiThreadState.hpp"
 31 #include "runtime/thread.inline.hpp"
 32 
 33 // JvmtiEnvThreadStateIterator implementation
 34 
 35 inline JvmtiEnvThreadStateIterator::JvmtiEnvThreadStateIterator(JvmtiThreadState* thread_state) {
 36   state = thread_state;
 37   Thread::current()->entering_jvmti_env_iteration();
 38 }
 39 
 40 inline JvmtiEnvThreadStateIterator::~JvmtiEnvThreadStateIterator() {
 41   Thread::current()->leaving_jvmti_env_iteration();
 42 }
 43 
 44 inline JvmtiEnvThreadState* JvmtiEnvThreadStateIterator::first() {
 45   return state->head_env_thread_state();
 46 }
 47 
 48 inline JvmtiEnvThreadState* JvmtiEnvThreadStateIterator::next(JvmtiEnvThreadState* ets) {
 49   return ets->next();
 50 }
 51 
 52 // JvmtiThreadState implementation
 53 
 54 JvmtiEnvThreadState* JvmtiThreadState::env_thread_state(JvmtiEnvBase *env) {
 55   JvmtiEnvThreadStateIterator it(this);
 56   for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
 57     if ((JvmtiEnvBase*)(ets->get_env()) == env) {
 58       return ets;
 59     }
 60   }
 61   return NULL;
 62 }
 63 
 64 JvmtiEnvThreadState* JvmtiThreadState::head_env_thread_state() {
 65   return _head_env_thread_state;
 66 }
 67 
 68 void JvmtiThreadState::set_head_env_thread_state(JvmtiEnvThreadState* ets) {
 69   _head_env_thread_state = ets;
 70 }
 71 
 72 inline JvmtiThreadState* JvmtiThreadState::state_for_while_locked(JavaThread *thread) {
 73   assert(JvmtiThreadState_lock->is_locked(), "sanity check");
 74 
 75   JvmtiThreadState *state = thread->jvmti_thread_state();
 76   if (state == NULL) {
 77     if (thread->is_exiting()) {
 78       // don't add a JvmtiThreadState to a thread that is exiting
 79       return NULL;
 80     }
 81 
 82     state = new JvmtiThreadState(thread);
 83   }
 84   return state;
 85 }
 86 
 87 inline JvmtiThreadState* JvmtiThreadState::state_for(JavaThread *thread) {
 88   JvmtiThreadState *state = thread->jvmti_thread_state();
 89   if (state == NULL) {
 90     MutexLocker mu(JvmtiThreadState_lock);
 91     // check again with the lock held
 92     state = state_for_while_locked(thread);
 93   } else {
 94     // Check possible safepoint even if state is non-null.
 95     // (Note: the thread argument isn't the current thread)
 96     DEBUG_ONLY(JavaThread::current()->check_possible_safepoint());
 97   }
 98   return state;
 99 }
100 
101 #endif // SHARE_PRIMS_JVMTITHREADSTATE_INLINE_HPP