XrdSysAtomics.hh

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00001 #ifndef _XRDSYSATOMICS_
00002 #define _XRDSYSATOMICS_
00003 /******************************************************************************/
00004 /*                                                                            */
00005 /*                      X r d S y s A t o m i c s . h h                       */
00006 /*                                                                            */
00007 /* (c) 2011 by the Board of Trustees of the Leland Stanford, Jr., University  */
00008 /*                            All Rights Reserved                             */
00009 /*   Produced by Andrew Hanushevsky for Stanford University under contract    */
00010 /*              DE-AC02-76-SFO0515 with the Department of Energy              */
00011 /*                                                                            */
00012 /* This file is part of the XRootD software suite.                            */
00013 /*                                                                            */
00014 /* XRootD is free software: you can redistribute it and/or modify it under    */
00015 /* the terms of the GNU Lesser General Public License as published by the     */
00016 /* Free Software Foundation, either version 3 of the License, or (at your     */
00017 /* option) any later version.                                                 */
00018 /*                                                                            */
00019 /* XRootD is distributed in the hope that it will be useful, but WITHOUT      */
00020 /* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or      */
00021 /* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public       */
00022 /* License for more details.                                                  */
00023 /*                                                                            */
00024 /* You should have received a copy of the GNU Lesser General Public License   */
00025 /* along with XRootD in a file called COPYING.LESSER (LGPL license) and file  */
00026 /* COPYING (GPL license).  If not, see <http://www.gnu.org/licenses/>.        */
00027 /*                                                                            */
00028 /* The copyright holder's institutional names and contributor's names may not */
00029 /* be used to endorse or promote products derived from this software without  */
00030 /* specific prior written permission of the institution or contributor.       */
00031 /******************************************************************************/
00032 
00033 /* The following instruction acronyms are used:
00034    AtomicCAS() -> Compare And [if equal] Set
00035    AtomicFAZ() -> Fetch And Zero
00036 */
00037   
00038 #ifdef HAVE_ATOMICS
00039 #define AtomicBeg(Mtx)
00040 #define AtomicEnd(Mtx)
00041 #define AtomicAdd(x, y)     __sync_fetch_and_add(&x, y)
00042 #define AtomicCAS(x, y, z)  __sync_bool_compare_and_swap(&x, y, z)
00043 #define AtomicDec(x)        __sync_fetch_and_sub(&x, 1)
00044 #define AtomicFAZ(x)        __sync_fetch_and_and(&x, 0)
00045 #define AtomicGet(x)        __sync_fetch_and_or(&x, 0)
00046 #define AtomicInc(x)        __sync_fetch_and_add(&x, 1)
00047 #define AtomicSub(x, y)     __sync_fetch_and_sub(&x, y)
00048 #else
00049 #define AtomicBeg(Mtx)      Mtx.Lock()
00050 #define AtomicEnd(Mtx)      Mtx.UnLock()
00051 #define AtomicAdd(x, y)     x += y
00052 #define AtomicCAS(x, y, z)  if (x == y) x = z
00053 #define AtomicDec(x)        x--
00054 #define AtomicFAZ(x)        x; x = 0
00055 #define AtomicGet(x)        x
00056 #define AtomicInc(x)        x++
00057 #define AtomicSub(x, y)     x -= y
00058 #endif
00059 #endif

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