1 /* 2 * Copyright (c) 2001, 2007, 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 inline HeapWord* G1OffsetTableContigSpace::allocate(size_t size) { 26 HeapWord* res = ContiguousSpace::allocate(size); 27 if (res != NULL) { 28 _offsets.alloc_block(res, size); 29 } 30 return res; 31 } 32 33 // Because of the requirement of keeping "_offsets" up to date with the 34 // allocations, we sequentialize these with a lock. Therefore, best if 35 // this is used for larger LAB allocations only. 36 inline HeapWord* G1OffsetTableContigSpace::par_allocate(size_t size) { 37 MutexLocker x(&_par_alloc_lock); 38 // This ought to be just "allocate", because of the lock above, but that 39 // ContiguousSpace::allocate asserts that either the allocating thread 40 // holds the heap lock or it is the VM thread and we're at a safepoint. 41 // The best I (dld) could figure was to put a field in ContiguousSpace 42 // meaning "locking at safepoint taken care of", and set/reset that 43 // here. But this will do for now, especially in light of the comment 44 // above. Perhaps in the future some lock-free manner of keeping the 45 // coordination. 46 HeapWord* res = ContiguousSpace::par_allocate(size); 47 if (res != NULL) { 48 _offsets.alloc_block(res, size); 49 } 50 return res; 51 } 52 53 inline HeapWord* G1OffsetTableContigSpace::block_start(const void* p) { 54 return _offsets.block_start(p); 55 } 56 57 inline HeapWord* 58 G1OffsetTableContigSpace::block_start_const(const void* p) const { 59 return _offsets.block_start_const(p); 60 }