Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #include "system.hxx"
      21             : 
      22             : #include <osl/interlck.h>
      23             : #include <osl/diagnose.h>
      24             : 
      25             : #if  ( defined ( SOLARIS ) || defined ( NETBSD ) ) && defined ( SPARC )
      26             : #error please use asm/interlck_sparc.s
      27             : #elif defined ( SOLARIS) && defined ( X86 )
      28             : #error please use asm/interlck_x86.s
      29             : #elif defined ( __GNUC__ ) && ( defined ( X86 ) || defined ( X86_64 ) )
      30             : /* That's possible on x86-64 too since oslInterlockedCount is a sal_Int32 */
      31             : 
      32           0 : oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
      33             : {
      34             : #if HAVE_GCC_BUILTIN_ATOMIC
      35           0 :     return __sync_add_and_fetch (pCount, 1);
      36             : #else
      37             :     register oslInterlockedCount nCount asm("%eax");
      38             :     nCount = 1;
      39             :     __asm__ __volatile__ (
      40             :         "lock\n\t"
      41             :         "xaddl %0, %1\n\t"
      42             :     :   "+r" (nCount), "+m" (*pCount)
      43             :     :   /* nothing */
      44             :     :   "memory");
      45             :     return ++nCount;
      46             : #endif
      47             : }
      48             : 
      49           0 : oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
      50             : {
      51             : #if HAVE_GCC_BUILTIN_ATOMIC
      52           0 :     return __sync_sub_and_fetch (pCount, 1);
      53             : #else
      54             :     register oslInterlockedCount nCount asm("%eax");
      55             :     nCount = -1;
      56             :     __asm__ __volatile__ (
      57             :         "lock\n\t"
      58             :         "xaddl %0, %1\n\t"
      59             :     :   "+r" (nCount), "+m" (*pCount)
      60             :     :   /* nothing */
      61             :     :   "memory");
      62             :     return --nCount;
      63             : #endif
      64             : }
      65             : #elif HAVE_GCC_BUILTIN_ATOMIC
      66             : oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
      67             : {
      68             :     return __sync_add_and_fetch(pCount, 1);
      69             : }
      70             : oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
      71             : {
      72             :     return __sync_sub_and_fetch(pCount, 1);
      73             : }
      74             : #else
      75             : /* use only if nothing else works, expensive due to single mutex for all reference counts */
      76             : 
      77             : static pthread_mutex_t InterLock = PTHREAD_MUTEX_INITIALIZER;
      78             : 
      79             : oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
      80             : {
      81             :     oslInterlockedCount Count;
      82             : 
      83             :     pthread_mutex_lock(&InterLock);
      84             :     Count = ++(*pCount);
      85             :     pthread_mutex_unlock(&InterLock);
      86             : 
      87             :     return Count;
      88             : }
      89             : 
      90             : oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
      91             : {
      92             :     oslInterlockedCount Count;
      93             : 
      94             :     pthread_mutex_lock(&InterLock);
      95             :     Count = --(*pCount);
      96             :     pthread_mutex_unlock(&InterLock);
      97             : 
      98             :     return Count;
      99             : }
     100             : 
     101             : #endif /* default */
     102             : 
     103             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */