| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * @author Xiao-Feng Li, 2006/10/05 |
| */ |
| |
| #include "mspace.h" |
| |
| static Boolean mspace_alloc_block(Mspace* mspace, Allocator* allocator) |
| { |
| alloc_context_reset(allocator); |
| |
| /* now try to get a new block */ |
| unsigned int old_free_idx = mspace->free_block_idx; |
| unsigned int new_free_idx = old_free_idx+1; |
| while( old_free_idx <= mspace->ceiling_block_idx ){ |
| unsigned int allocated_idx = atomic_cas32(&mspace->free_block_idx, new_free_idx, old_free_idx); |
| if(allocated_idx != old_free_idx){ |
| old_free_idx = mspace->free_block_idx; |
| new_free_idx = old_free_idx+1; |
| continue; |
| } |
| /* ok, got one */ |
| Block_Header* alloc_block = (Block_Header*)&(mspace->blocks[allocated_idx - mspace->first_block_idx]); |
| |
| allocator_init_free_block(allocator, alloc_block); |
| |
| return TRUE; |
| } |
| |
| /* Mspace is out. If it's caused by mutator, a collection should be triggered. |
| If it's caused by collector, a fallback should be triggered. */ |
| return FALSE; |
| |
| } |
| |
| void* mspace_alloc(unsigned int size, Allocator* allocator) |
| { |
| void *p_return = NULL; |
| |
| /* All chunks of data requested need to be multiples of GC_OBJECT_ALIGNMENT */ |
| assert((size % GC_OBJECT_ALIGNMENT) == 0); |
| assert( size <= GC_LOS_OBJ_SIZE_THRESHOLD ); |
| |
| /* check if collector local alloc block is ok. If not, grab a new block */ |
| p_return = thread_local_alloc(size, allocator); |
| if(p_return) return p_return; |
| |
| /* grab a new block */ |
| Mspace* mspace = (Mspace*)allocator->alloc_space;; |
| Boolean ok = mspace_alloc_block(mspace, allocator); |
| if(!ok) return NULL; |
| |
| p_return = thread_local_alloc(size, allocator); |
| assert(p_return); |
| |
| return p_return; |
| } |
| |
| |
| |
| |