00001 #ifndef __XrdBuffer_H__ 00002 #define __XrdBuffer_H__ 00003 /******************************************************************************/ 00004 /* */ 00005 /* X r d B u f f e r . 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 <stdlib.h> 00033 #include <unistd.h> 00034 #include <sys/types.h> 00035 #include "XrdSys/XrdSysPthread.hh" 00036 00037 /******************************************************************************/ 00038 /* x r d _ B u f f e r */ 00039 /******************************************************************************/ 00040 00041 class XrdBuffer 00042 { 00043 public: 00044 00045 char * buff; // -> buffer 00046 int bsize; // size of this buffer 00047 00048 XrdBuffer(char *bp, int sz, int ix) 00049 {buff = bp; bsize = sz; bindex = ix; next = 0;} 00050 00051 ~XrdBuffer() {if (buff) free(buff);} 00052 00053 friend class XrdBuffManager; 00054 private: 00055 00056 int bindex; 00057 XrdBuffer *next; 00058 static int pagesz; 00059 }; 00060 00061 /******************************************************************************/ 00062 /* x r d _ B u f f M a n a g e r */ 00063 /******************************************************************************/ 00064 00065 #define XRD_BUCKETS 12 00066 #define XRD_BUSHIFT 10 00067 00068 // There should be only one instance of this class per buffer pool. 00069 // 00070 class XrdOucTrace; 00071 class XrdSysError; 00072 00073 class XrdBuffManager 00074 { 00075 public: 00076 00077 void Init(); 00078 00079 XrdBuffer *Obtain(int bsz); 00080 00081 int Recalc(int bsz); 00082 00083 void Release(XrdBuffer *bp); 00084 00085 int MaxSize() {return maxsz;} 00086 00087 void Reshape(); 00088 00089 void Set(int maxmem=-1, int minw=-1); 00090 00091 int Stats(char *buff, int blen, int do_sync=0); 00092 00093 XrdBuffManager(XrdSysError *lP, XrdOucTrace *tP, int minrst=20*60); 00094 00095 ~XrdBuffManager() {} // The buffmanager is never deleted 00096 00097 private: 00098 00099 XrdOucTrace *XrdTrace; 00100 XrdSysError *XrdLog; 00101 00102 const int slots; 00103 const int shift; 00104 const int pagsz; 00105 const int maxsz; 00106 00107 struct {XrdBuffer *bnext; 00108 int numbuf; 00109 int numreq; 00110 } bucket[XRD_BUCKETS]; // 1K to 1<<(szshift+slots-1)M buffers 00111 00112 int totreq; 00113 int totbuf; 00114 long long totalo; 00115 long long maxalo; 00116 int minrsw; 00117 int rsinprog; 00118 int totadj; 00119 00120 XrdSysCondVar Reshaper; 00121 static const char *TraceID; 00122 }; 00123 #endif