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 "system.hxx"
  21
  22 #include <config_global.h>
  23 #include <osl/interlck.h>
  24
  25 #if  ( defined (__sun) || defined ( NETBSD ) ) && defined ( SPARC )
  26 #error please use asm/interlck_sparc.s
  27 #elif defined (__sun) && defined ( X86 )
  28 #error please use asm/interlck_x86.s
  29 #elif HAVE_GCC_BUILTIN_ATOMIC
  30 oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
  31 {
  32     return __sync_add_and_fetch(pCount, 1);
  33 }
  34 oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
  35 {
  36     return __sync_sub_and_fetch(pCount, 1);
  37 }
  38 #elif defined ( __GNUC__ ) && ( defined ( X86 ) || defined ( X86_64 ) )
  39 /* That's possible on x86-64 too since oslInterlockedCount is a sal_Int32 */
  40
  41 oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
  42 {
  43     register oslInterlockedCount nCount asm("%eax");
  44     nCount = 1;
  45     __asm__ __volatile__ (
  46         "lock\n\t"
  47         "xaddl %0, %1\n\t"
  48     :   "+r" (nCount), "+m" (*pCount)
  49     :   /* nothing */
  50     :   "memory");
  51     return ++nCount;
  52 }
  53
  54 oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
  55 {
  56     register oslInterlockedCount nCount asm("%eax");
  57     nCount = -1;
  58     __asm__ __volatile__ (
  59         "lock\n\t"
  60         "xaddl %0, %1\n\t"
  61     :   "+r" (nCount), "+m" (*pCount)
  62     :   /* nothing */
  63     :   "memory");
  64     return --nCount;
  65 }
  66 #else
  67 /* use only if nothing else works, expensive due to single mutex for all reference counts */
  68
  69 static pthread_mutex_t InterLock = PTHREAD_MUTEX_INITIALIZER;
  70
  71 oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
  72 {
  73     oslInterlockedCount Count;
  74
  75     pthread_mutex_lock(&InterLock);
  76     Count = ++(*pCount);
  77     pthread_mutex_unlock(&InterLock);
  78
  79     return Count;
  80 }
  81
  82 oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
  83 {
  84     oslInterlockedCount Count;
  85
  86     pthread_mutex_lock(&InterLock);
  87     Count = --(*pCount);
  88     pthread_mutex_unlock(&InterLock);
  89
  90     return Count;
  91 }
  92
  93 #endif /* default */
  94
  95 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */