sal/osl/unx/interlck.cxx

   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 <config_global.h>
  21 #include <osl/interlck.h>
  22
  23 #if  ( defined (__sun) || defined ( NETBSD ) ) && defined ( SPARC )
  24 #error please use asm/interlck_sparc.s
  25 #elif defined (__sun) && defined ( X86 )
  26 #error please use asm/interlck_x86.s
  27 #elif HAVE_GCC_BUILTIN_ATOMIC
  28 oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
  29 {
  30     return __sync_add_and_fetch(pCount, 1);
  31 }
  32 oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
  33 {
  34     return __sync_sub_and_fetch(pCount, 1);
  35 }
  36 #elif defined ( __GNUC__ ) && ( defined ( X86 ) || defined ( X86_64 ) )
  37 /* That's possible on x86-64 too since oslInterlockedCount is a sal_Int32 */
  38
  39 oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
  40 {
  41     register oslInterlockedCount nCount asm("%eax");
  42     nCount = 1;
  43     __asm__ __volatile__ (
  44         "lock\n\t"
  45         "xaddl %0, %1\n\t"
  46     :   "+r" (nCount), "+m" (*pCount)
  47     :   /* nothing */
  48     :   "memory");
  49     return ++nCount;
  50 }
  51
  52 oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
  53 {
  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 }
  64 #else
  65 /* use only if nothing else works, expensive due to single mutex for all reference counts */
  66
  67 static pthread_mutex_t InterLock = PTHREAD_MUTEX_INITIALIZER;
  68
  69 oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
  70 {
  71     oslInterlockedCount Count;
  72
  73     pthread_mutex_lock(&InterLock);
  74     Count = ++(*pCount);
  75     pthread_mutex_unlock(&InterLock);
  76
  77     return Count;
  78 }
  79
  80 oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
  81 {
  82     oslInterlockedCount Count;
  83
  84     pthread_mutex_lock(&InterLock);
  85     Count = --(*pCount);
  86     pthread_mutex_unlock(&InterLock);
  87
  88     return Count;
  89 }
  90
  91 #endif /* default */
  92
  93 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */