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File indexing completed on 2025-01-30 10:27:52
0001 #ifndef __XrdBuffer_H__ 0002 #define __XrdBuffer_H__ 0003 /******************************************************************************/ 0004 /* */ 0005 /* X r d B u f f e r . h h */ 0006 /* */ 0007 /* (c) 2004 by the Board of Trustees of the Leland Stanford, Jr., University */ 0008 /* Produced by Andrew Hanushevsky for Stanford University under contract */ 0009 /* DE-AC02-76-SFO0515 with the Department of Energy */ 0010 /* */ 0011 /* This file is part of the XRootD software suite. */ 0012 /* */ 0013 /* XRootD is free software: you can redistribute it and/or modify it under */ 0014 /* the terms of the GNU Lesser General Public License as published by the */ 0015 /* Free Software Foundation, either version 3 of the License, or (at your */ 0016 /* option) any later version. */ 0017 /* */ 0018 /* XRootD is distributed in the hope that it will be useful, but WITHOUT */ 0019 /* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */ 0020 /* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */ 0021 /* License for more details. */ 0022 /* */ 0023 /* You should have received a copy of the GNU Lesser General Public License */ 0024 /* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */ 0025 /* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */ 0026 /* */ 0027 /* The copyright holder's institutional names and contributor's names may not */ 0028 /* be used to endorse or promote products derived from this software without */ 0029 /* specific prior written permission of the institution or contributor. */ 0030 /******************************************************************************/ 0031 0032 #include <cstdlib> 0033 #include <unistd.h> 0034 #include <sys/types.h> 0035 #include "XrdSys/XrdSysPthread.hh" 0036 0037 /******************************************************************************/ 0038 /* x r d _ B u f f e r */ 0039 /******************************************************************************/ 0040 0041 class XrdBuffer 0042 { 0043 public: 0044 0045 char * buff; // -> buffer 0046 int bsize; // size of this buffer 0047 0048 XrdBuffer(char *bp, int sz, int ix) 0049 {buff = bp; bsize = sz; bindex = ix; next = 0;} 0050 0051 ~XrdBuffer() {if (buff) free(buff);} 0052 0053 friend class XrdBuffManager; 0054 friend class XrdBuffXL; 0055 private: 0056 0057 int bindex; 0058 XrdBuffer *next; 0059 static int pagesz; 0060 }; 0061 0062 /******************************************************************************/ 0063 /* x r d _ B u f f M a n a g e r */ 0064 /******************************************************************************/ 0065 0066 #define XRD_BUCKETS 12 0067 #define XRD_BUSHIFT 10 0068 0069 // There should be only one instance of this class per buffer pool. 0070 // 0071 class XrdBuffManager 0072 { 0073 public: 0074 0075 void Init(); 0076 0077 XrdBuffer *Obtain(int bsz); 0078 0079 int Recalc(int bsz); 0080 0081 void Release(XrdBuffer *bp); 0082 0083 int MaxSize() {return maxsz;} 0084 0085 void Reshape(); 0086 0087 void Set(int maxmem=-1, int minw=-1); 0088 0089 int Stats(char *buff, int blen, int do_sync=0); 0090 0091 XrdBuffManager(int minrst=20*60); 0092 0093 ~XrdBuffManager(); // The buffmanager is never deleted 0094 0095 private: 0096 0097 const int slots; 0098 const int shift; 0099 const int pagsz; 0100 const int maxsz; 0101 0102 struct {XrdBuffer *bnext; 0103 int numbuf; 0104 int numreq; 0105 } bucket[XRD_BUCKETS]; // 1K to 1<<(szshift+slots-1)M buffers 0106 0107 int totreq; 0108 int totbuf; 0109 long long totalo; 0110 long long maxalo; 0111 int minrsw; 0112 int rsinprog; 0113 int totadj; 0114 0115 XrdSysCondVar Reshaper; 0116 static const char *TraceID; 0117 }; 0118 #endif
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