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 #define AtomicZAP(x) __sync_fetch_and_and(&x, 0) 00049 #else 00050 #define AtomicBeg(Mtx) Mtx.Lock() 00051 #define AtomicEnd(Mtx) Mtx.UnLock() 00052 #define AtomicAdd(x, y) x += y 00053 #define AtomicCAS(x, y, z) if (x == y) x = z 00054 #define AtomicDec(x) x-- 00055 #define AtomicFAZ(x) x; x = 0 00056 #define AtomicGet(x) x 00057 #define AtomicInc(x) x++ 00058 #define AtomicSub(x, y) x -= y 00059 #define AtomicZAP(x) x = 0 00060 #endif 00061 #endif