1*9eab2a37SAndrew Rist /************************************************************** 2cdf0e10cSrcweir * 3*9eab2a37SAndrew Rist * Licensed to the Apache Software Foundation (ASF) under one 4*9eab2a37SAndrew Rist * or more contributor license agreements. See the NOTICE file 5*9eab2a37SAndrew Rist * distributed with this work for additional information 6*9eab2a37SAndrew Rist * regarding copyright ownership. The ASF licenses this file 7*9eab2a37SAndrew Rist * to you under the Apache License, Version 2.0 (the 8*9eab2a37SAndrew Rist * "License"); you may not use this file except in compliance 9*9eab2a37SAndrew Rist * with the License. You may obtain a copy of the License at 10*9eab2a37SAndrew Rist * 11*9eab2a37SAndrew Rist * http://www.apache.org/licenses/LICENSE-2.0 12*9eab2a37SAndrew Rist * 13*9eab2a37SAndrew Rist * Unless required by applicable law or agreed to in writing, 14*9eab2a37SAndrew Rist * software distributed under the License is distributed on an 15*9eab2a37SAndrew Rist * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16*9eab2a37SAndrew Rist * KIND, either express or implied. See the License for the 17*9eab2a37SAndrew Rist * specific language governing permissions and limitations 18*9eab2a37SAndrew Rist * under the License. 19*9eab2a37SAndrew Rist * 20*9eab2a37SAndrew Rist *************************************************************/ 21*9eab2a37SAndrew Rist 22*9eab2a37SAndrew Rist 23cdf0e10cSrcweir 24cdf0e10cSrcweir #ifndef INCLUDED_SAL_INTERNAL_ONCE_H 25cdf0e10cSrcweir #define INCLUDED_SAL_INTERNAL_ONCE_H 26cdf0e10cSrcweir 27cdf0e10cSrcweir /** sal_once_type 28cdf0e10cSrcweir * (platform dependent) 29cdf0e10cSrcweir */ 30cdf0e10cSrcweir 31cdf0e10cSrcweir #if defined(SAL_UNX) || defined(SAL_OS2) 32cdf0e10cSrcweir 33cdf0e10cSrcweir #include <pthread.h> 34cdf0e10cSrcweir 35cdf0e10cSrcweir typedef pthread_once_t sal_once_type; 36cdf0e10cSrcweir 37cdf0e10cSrcweir #define SAL_ONCE_INIT PTHREAD_ONCE_INIT 38cdf0e10cSrcweir #define SAL_ONCE(once, init) pthread_once((once), (init)) 39cdf0e10cSrcweir 40cdf0e10cSrcweir #elif defined(SAL_W32) 41cdf0e10cSrcweir 42cdf0e10cSrcweir #define WIN32_LEAN_AND_MEAN 43cdf0e10cSrcweir #pragma warning(push,1) /* disable warnings within system headers */ 44cdf0e10cSrcweir #include <windows.h> 45cdf0e10cSrcweir #pragma warning(pop) 46cdf0e10cSrcweir 47cdf0e10cSrcweir typedef struct sal_once_st sal_once_type; 48cdf0e10cSrcweir struct sal_once_st 49cdf0e10cSrcweir { 50cdf0e10cSrcweir LONG volatile m_done; 51cdf0e10cSrcweir LONG volatile m_lock; 52cdf0e10cSrcweir }; 53cdf0e10cSrcweir 54cdf0e10cSrcweir #define SAL_ONCE_INIT { 0, 0 } 55cdf0e10cSrcweir #define SAL_ONCE(once, init) \ 56cdf0e10cSrcweir { \ 57cdf0e10cSrcweir sal_once_type * control = (once); \ 58cdf0e10cSrcweir if (!(control->m_done)) \ 59cdf0e10cSrcweir { \ 60cdf0e10cSrcweir while (InterlockedExchange(&(control->m_lock), 1) == 1) Sleep(0); \ 61cdf0e10cSrcweir if (!(control->m_done)) \ 62cdf0e10cSrcweir { \ 63cdf0e10cSrcweir void (*init_routine)(void) = (init); \ 64cdf0e10cSrcweir (*init_routine)(); \ 65cdf0e10cSrcweir control->m_done = 1; \ 66cdf0e10cSrcweir } \ 67cdf0e10cSrcweir InterlockedExchange(&(control->m_lock), 0); \ 68cdf0e10cSrcweir } \ 69cdf0e10cSrcweir } 70cdf0e10cSrcweir 71cdf0e10cSrcweir #else 72cdf0e10cSrcweir #error Unknown platform 73cdf0e10cSrcweir #endif /* SAL_UNX | SAL_W32 */ 74cdf0e10cSrcweir 75cdf0e10cSrcweir #endif /* INCLUDED_SAL_INTERNAL_ONCE_H */ 76