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1 /*
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2 * Copyright 2000-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 inline bool GC_locker::is_active() {
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26 return _lock_count > 0 || _jni_lock_count > 0;
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27 }
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28
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29 inline bool GC_locker::check_active_before_gc() {
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30 if (is_active()) {
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31 set_needs_gc();
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32 }
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33 return is_active();
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34 }
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35
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36 inline void GC_locker::lock() {
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37 // cast away volatile
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38 Atomic::inc(&_lock_count);
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39 CHECK_UNHANDLED_OOPS_ONLY(
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40 if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; })
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41 assert(Universe::heap() == NULL ||
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42 !Universe::heap()->is_gc_active(), "locking failed");
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43 }
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44
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45 inline void GC_locker::unlock() {
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46 // cast away volatile
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47 Atomic::dec(&_lock_count);
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48 CHECK_UNHANDLED_OOPS_ONLY(
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49 if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; })
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50 }
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51
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52 inline void GC_locker::lock_critical(JavaThread* thread) {
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53 if (!thread->in_critical()) {
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54 if (!needs_gc()) {
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55 jni_lock();
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56 } else {
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57 jni_lock_slow();
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58 }
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59 }
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60 thread->enter_critical();
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61 }
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62
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63 inline void GC_locker::unlock_critical(JavaThread* thread) {
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64 thread->exit_critical();
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65 if (!thread->in_critical()) {
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66 if (!needs_gc()) {
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67 jni_unlock();
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68 } else {
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69 jni_unlock_slow();
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70 }
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71 }
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72 }
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