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             : 
      21             : #include "system.h"
      22             : 
      23             : #include <osl/interlck.h>
      24             : #include <osl/diagnose.h>
      25             : 
      26             : #if  ( defined ( SOLARIS ) || defined ( NETBSD ) ) && defined ( SPARC )
      27             : #error please use asm/interlck_sparc.s
      28             : #elif defined ( SOLARIS) && defined ( X86 )
      29             : #error please use asm/interlck_x86.s
      30             : #elif defined ( GCC ) && ( defined ( X86 ) || defined ( X86_64 ) )
      31             : /* That's possible on x86-64 too since oslInterlockedCount is a sal_Int32 */
      32             : 
      33             : extern int osl_isSingleCPU;
      34             : 
      35             : /*****************************************************************************/
      36             : /* osl_incrementInterlockedCount */
      37             : /*****************************************************************************/
      38           0 : oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
      39             : {
      40             :     // Fast case for old, slow, single CPU Intel machines for whom
      41             :     // interlocking is a performance nightmare.
      42           0 :     if ( osl_isSingleCPU ) {
      43             :         register oslInterlockedCount nCount asm("%eax");
      44           0 :         nCount = 1;
      45           0 :         __asm__ __volatile__ (
      46             :             "xaddl %0, %1\n\t"
      47             :         :   "+r" (nCount), "+m" (*pCount)
      48             :         :   /* nothing */
      49             :         :   "memory");
      50           0 :         return ++nCount;
      51             :     }
      52             : #if defined( HAVE_GCC_BUILTIN_ATOMIC )
      53             :     else
      54           0 :         return __sync_add_and_fetch (pCount, 1);
      55             : #else
      56             :     else {
      57             :         register oslInterlockedCount nCount asm("%eax");
      58             :         nCount = 1;
      59             :         __asm__ __volatile__ (
      60             :             "lock\n\t"
      61             :             "xaddl %0, %1\n\t"
      62             :         :   "+r" (nCount), "+m" (*pCount)
      63             :         :   /* nothing */
      64             :         :   "memory");
      65             :         return ++nCount;
      66             :     }
      67             : #endif
      68             : }
      69             : 
      70           0 : oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
      71             : {
      72           0 :     if ( osl_isSingleCPU ) {
      73             :         register oslInterlockedCount nCount asm("%eax");
      74           0 :         nCount = -1;
      75           0 :         __asm__ __volatile__ (
      76             :             "xaddl %0, %1\n\t"
      77             :         :   "+r" (nCount), "+m" (*pCount)
      78             :         :   /* nothing */
      79             :         :   "memory");
      80           0 :         return --nCount;
      81             :     }
      82             : #if defined( HAVE_GCC_BUILTIN_ATOMIC )
      83             :     else
      84           0 :         return __sync_sub_and_fetch (pCount, 1);
      85             : #else
      86             :     else {
      87             :         register oslInterlockedCount nCount asm("%eax");
      88             :         nCount = -1;
      89             :         __asm__ __volatile__ (
      90             :             "lock\n\t"
      91             :             "xaddl %0, %1\n\t"
      92             :         :   "+r" (nCount), "+m" (*pCount)
      93             :         :   /* nothing */
      94             :         :   "memory");
      95             :         return --nCount;
      96             :     }
      97             : #endif
      98             : }
      99             : #elif defined( HAVE_GCC_BUILTIN_ATOMIC )
     100             : oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
     101             : {
     102             :     return __sync_add_and_fetch(pCount, 1);
     103             : }
     104             : oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
     105             : {
     106             :     return __sync_sub_and_fetch(pCount, 1);
     107             : }
     108             : #else
     109             : /* use only if nothing else works, expensive due to single mutex for all reference counts */
     110             : 
     111             : static pthread_mutex_t InterLock = PTHREAD_MUTEX_INITIALIZER;
     112             : 
     113             : /*****************************************************************************/
     114             : /* osl_incrementInterlockedCount */
     115             : /*****************************************************************************/
     116             : oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
     117             : {
     118             :     oslInterlockedCount Count;
     119             : 
     120             :     pthread_mutex_lock(&InterLock);
     121             :     Count = ++(*pCount);
     122             :     pthread_mutex_unlock(&InterLock);
     123             : 
     124             :     return (Count);
     125             : }
     126             : 
     127             : /*****************************************************************************/
     128             : /* osl_decrementInterlockedCount */
     129             : /*****************************************************************************/
     130             : oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
     131             : {
     132             :     oslInterlockedCount Count;
     133             : 
     134             :     pthread_mutex_lock(&InterLock);
     135             :     Count = --(*pCount);
     136             :     pthread_mutex_unlock(&InterLock);
     137             : 
     138             :     return (Count);
     139             : }
     140             : 
     141             : #endif /* default */
     142             : 
     143             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */