13c827367444ee418f129b2c238299f49d3264554Jarkko Poyry/*------------------------------------------------------------------------- 23c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * drawElements Thread Library 33c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * --------------------------- 43c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * 53c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * Copyright 2014 The Android Open Source Project 63c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * 73c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * Licensed under the Apache License, Version 2.0 (the "License"); 83c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * you may not use this file except in compliance with the License. 93c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * You may obtain a copy of the License at 103c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * 113c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * http://www.apache.org/licenses/LICENSE-2.0 123c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * 133c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * Unless required by applicable law or agreed to in writing, software 143c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * distributed under the License is distributed on an "AS IS" BASIS, 153c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 163c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * See the License for the specific language governing permissions and 173c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * limitations under the License. 183c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * 193c827367444ee418f129b2c238299f49d3264554Jarkko Poyry *//*! 203c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * \file 213c827367444ee418f129b2c238299f49d3264554Jarkko Poyry * \brief Thread-safe singleton. 223c827367444ee418f129b2c238299f49d3264554Jarkko Poyry *//*--------------------------------------------------------------------*/ 233c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 243c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "deSingleton.h" 253c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "deAtomic.h" 263c827367444ee418f129b2c238299f49d3264554Jarkko Poyry#include "deThread.h" 273c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 283c827367444ee418f129b2c238299f49d3264554Jarkko PoyryDE_STATIC_ASSERT(sizeof(deSingletonState) == sizeof(deUint32)); 293c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 303c827367444ee418f129b2c238299f49d3264554Jarkko Poyryvoid deInitSingleton (volatile deSingletonState* singletonState, deSingletonConstructorFunc constructor, void* arg) 313c827367444ee418f129b2c238299f49d3264554Jarkko Poyry{ 323c827367444ee418f129b2c238299f49d3264554Jarkko Poyry if (*singletonState != DE_SINGLETON_STATE_INITIALIZED) 333c827367444ee418f129b2c238299f49d3264554Jarkko Poyry { 343c827367444ee418f129b2c238299f49d3264554Jarkko Poyry deSingletonState curState = (deSingletonState)deAtomicCompareExchange32((volatile deUint32*)singletonState, (deUint32)DE_SINGLETON_STATE_NOT_INITIALIZED, (deUint32)DE_SINGLETON_STATE_INITIALIZING); 353c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 363c827367444ee418f129b2c238299f49d3264554Jarkko Poyry if (curState == DE_SINGLETON_STATE_NOT_INITIALIZED) 373c827367444ee418f129b2c238299f49d3264554Jarkko Poyry { 383c827367444ee418f129b2c238299f49d3264554Jarkko Poyry constructor(arg); 393c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 403c827367444ee418f129b2c238299f49d3264554Jarkko Poyry deMemoryReadWriteFence(); 413c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 423c827367444ee418f129b2c238299f49d3264554Jarkko Poyry *singletonState = DE_SINGLETON_STATE_INITIALIZED; 433c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 443c827367444ee418f129b2c238299f49d3264554Jarkko Poyry deMemoryReadWriteFence(); 453c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 463c827367444ee418f129b2c238299f49d3264554Jarkko Poyry else if (curState == DE_SINGLETON_STATE_INITIALIZING) 473c827367444ee418f129b2c238299f49d3264554Jarkko Poyry { 483c827367444ee418f129b2c238299f49d3264554Jarkko Poyry for (;;) 493c827367444ee418f129b2c238299f49d3264554Jarkko Poyry { 503c827367444ee418f129b2c238299f49d3264554Jarkko Poyry deMemoryReadWriteFence(); 513c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 523c827367444ee418f129b2c238299f49d3264554Jarkko Poyry if (*singletonState == DE_SINGLETON_STATE_INITIALIZED) 533c827367444ee418f129b2c238299f49d3264554Jarkko Poyry break; 543c827367444ee418f129b2c238299f49d3264554Jarkko Poyry else 553c827367444ee418f129b2c238299f49d3264554Jarkko Poyry deYield(); 563c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 573c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 583c827367444ee418f129b2c238299f49d3264554Jarkko Poyry 593c827367444ee418f129b2c238299f49d3264554Jarkko Poyry DE_ASSERT(*singletonState == DE_SINGLETON_STATE_INITIALIZED); 603c827367444ee418f129b2c238299f49d3264554Jarkko Poyry } 613c827367444ee418f129b2c238299f49d3264554Jarkko Poyry} 62