jdk8-mips64-public/hotspot: src/share/vm/memory/gcLocker.inline.hpp@09d00c18e323

     1 /*

     2  * Copyright (c) 2000, 2012, 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

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    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

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    23  */

    25 #ifndef SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP

    26 #define SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP

    28 #include "memory/gcLocker.hpp"

    30 inline bool GC_locker::is_active() {

    31   assert(_needs_gc || SafepointSynchronize::is_at_safepoint(), "only read at safepoint");

    32   verify_critical_count();

    33   return _lock_count > 0 || _jni_lock_count > 0;

    34 }

    36 inline void GC_locker::lock() {

    37   // cast away volatile

    38   Atomic::inc(&_lock_count);

    39   CHECK_UNHANDLED_OOPS_ONLY(

    40     if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; })

    41   assert(Universe::heap() == NULL ||

    42          !Universe::heap()->is_gc_active(), "locking failed");

    43 }

    45 inline void GC_locker::unlock() {

    46   // cast away volatile

    47   Atomic::dec(&_lock_count);

    48   CHECK_UNHANDLED_OOPS_ONLY(

    49     if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; })

    50 }

    52 inline void GC_locker::lock_critical(JavaThread* thread) {

    53   if (!thread->in_critical()) {

    54     if (needs_gc()) {

    55       // jni_lock call calls enter_critical under the lock so that the

    56       // global lock count and per thread count are in agreement.

    57       jni_lock(thread);

    58       return;

    59     }

    60     increment_debug_jni_lock_count();

    61   }

    62   thread->enter_critical();

    63 }

    65 inline void GC_locker::unlock_critical(JavaThread* thread) {

    66   if (thread->in_last_critical()) {

    67     if (needs_gc()) {

    68       // jni_unlock call calls exit_critical under the lock so that

    69       // the global lock count and per thread count are in agreement.

    70       jni_unlock(thread);

    71       return;

    72     }

    73     decrement_debug_jni_lock_count();

    74   }

    75   thread->exit_critical();

    76 }

    78 #endif // SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP

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