1 /* 2 * Copyright (c) 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_MUTEX_INLINE_HPP 26 #define SHARE_RUNTIME_MUTEX_INLINE_HPP 27 28 #include "runtime/mutex.hpp" 29 #include "runtime/os.inline.hpp" 30 #include "runtime/thread.hpp" 31 32 inline bool Mutex::try_lock(Thread* self) { 33 // Some safepoint_check_always locks use try_lock, so cannot check 34 // safepoint state, but can check blocking state. 35 check_block_state(self); 36 if (_lock.try_lock()) { 37 assert_owner(NULL); 38 set_owner(self); 39 return true; 40 } 41 return false; 42 } 43 44 inline bool Mutex::try_lock() { 45 return this->try_lock(Thread::current()); 46 } 47 48 inline void Mutex::lock(Thread* self) { 49 if (try_lock(self)) { 50 return; 51 } 52 lock_slow(self); 53 } 54 55 inline void Mutex::lock() { 56 this->lock(Thread::current()); 57 } 58 59 // JavaThreads when it is known to be safe to not check for a safepoint when 60 // acquiring this lock. If the thread blocks acquiring the lock it is not 61 // safepoint-safe and so will prevent a safepoint from being reached. If used 62 // in the wrong way this can lead to a deadlock with the safepoint code. 63 inline void Mutex::lock_without_safepoint_check(Thread * self) { 64 check_no_safepoint_state(self); 65 assert(_owner != self, "invariant"); 66 _lock.lock(); 67 assert_owner(NULL); 68 set_owner(self); 69 } 70 71 inline void Mutex::lock_without_safepoint_check() { 72 lock_without_safepoint_check(Thread::current()); 73 } 74 75 inline void Mutex::release_for_safepoint() { 76 assert_owner(NULL); 77 _lock.unlock(); 78 } 79 80 inline void Mutex::unlock() { 81 assert_owner(Thread::current()); 82 set_owner(NULL); 83 _lock.unlock(); 84 } 85 86 // Lock without safepoint check - a degenerate variant of lock() for use by 87 88 #endif // SHARE_RUNTIME_MUTEX_INLINE_HPP