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