XrdSfsAio.hh

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00001 #ifndef __SFS_AIO_H__
00002 #define __SFS_AIO_H__
00003 /******************************************************************************/
00004 /*                                                                            */
00005 /*                          X r d S f s A i o . h h                           */
00006 /*                                                                            */
00007 /* (c) 2004 by the Board of Trustees of the Leland Stanford, Jr., University  */
00008 /*   Produced by Andrew Hanushevsky for Stanford University under contract    */
00009 /*              DE-AC02-76-SFO0515 with the Department of Energy              */
00010 /*                                                                            */
00011 /* This file is part of the XRootD software suite.                            */
00012 /*                                                                            */
00013 /* XRootD is free software: you can redistribute it and/or modify it under    */
00014 /* the terms of the GNU Lesser General Public License as published by the     */
00015 /* Free Software Foundation, either version 3 of the License, or (at your     */
00016 /* option) any later version.                                                 */
00017 /*                                                                            */
00018 /* XRootD is distributed in the hope that it will be useful, but WITHOUT      */
00019 /* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or      */
00020 /* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public       */
00021 /* License for more details.                                                  */
00022 /*                                                                            */
00023 /* You should have received a copy of the GNU Lesser General Public License   */
00024 /* along with XRootD in a file called COPYING.LESSER (LGPL license) and file  */
00025 /* COPYING (GPL license).  If not, see <http://www.gnu.org/licenses/>.        */
00026 /*                                                                            */
00027 /* The copyright holder's institutional names and contributor's names may not */
00028 /* be used to endorse or promote products derived from this software without  */
00029 /* specific prior written permission of the institution or contributor.       */
00030 /******************************************************************************/
00031 
00032 #include <signal.h>
00033 #include <sys/types.h>
00034 // _POSIX_ASYNCHRONOUS_IO, if it is defined, is in unistd.h.
00035 #include <unistd.h>
00036 #ifdef _POSIX_ASYNCHRONOUS_IO
00037 #ifdef __APPLE__
00038 #include <AvailabilityMacros.h>
00039 #include <sys/aio.h>
00040 #else
00041 #include <aio.h>
00042 #endif
00043 #else
00044 struct aiocb {           // Minimal structure to avoid compiler errors
00045        int    aio_fildes;
00046        void  *aio_buf;
00047        size_t aio_nbytes;
00048        off_t  aio_offset;
00049        int    aio_reqprio;
00050        struct sigevent aio_sigevent;
00051       };
00052 #endif
00053 
00054 // The XrdSfsAIO class is meant to be derived. This object provides the
00055 // basic interface to handle AIO control block queues not processing.
00056 //
00057 class XrdSfsAio
00058 {
00059 public:
00060 
00061 struct aiocb sfsAio;
00062 
00063 ssize_t      Result; // If >= 0 valid result; else is -errno
00064 
00065 const char  *TIdent; // Trace information (optional)
00066 
00067 // Method to handle completed reads
00068 //
00069 virtual void doneRead() = 0;
00070 
00071 // Method to hand completed writes
00072 //
00073 virtual void doneWrite() = 0;
00074 
00075 // Method to recycle free object
00076 //
00077 virtual void Recycle() = 0;
00078 
00079              XrdSfsAio() {
00080 #if defined(__APPLE__) && (!defined(MAC_OS_X_VERSION_10_4) || \
00081     MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_4)
00082                          sfsAio.aio_sigevent.sigev_value.sigval_ptr = (void *)this;
00083 #else
00084                          sfsAio.aio_sigevent.sigev_value.sival_ptr  = (void *)this;
00085 #endif
00086                          sfsAio.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
00087                          sfsAio.aio_reqprio = 0;
00088                          TIdent = (char *)"";
00089                         }
00090 virtual     ~XrdSfsAio() {}
00091 };
00092 #endif

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