XRootD
XrdBuffer.hh
Go to the documentation of this file.
1 #ifndef __XrdBuffer_H__
2 #define __XrdBuffer_H__
3 /******************************************************************************/
4 /* */
5 /* X r d B u f f e r . h h */
6 /* */
7 /* (c) 2004 by the Board of Trustees of the Leland Stanford, Jr., University */
8 /* Produced by Andrew Hanushevsky for Stanford University under contract */
9 /* DE-AC02-76-SFO0515 with the Department of Energy */
10 /* */
11 /* This file is part of the XRootD software suite. */
12 /* */
13 /* XRootD is free software: you can redistribute it and/or modify it under */
14 /* the terms of the GNU Lesser General Public License as published by the */
15 /* Free Software Foundation, either version 3 of the License, or (at your */
16 /* option) any later version. */
17 /* */
18 /* XRootD is distributed in the hope that it will be useful, but WITHOUT */
19 /* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
20 /* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
21 /* License for more details. */
22 /* */
23 /* You should have received a copy of the GNU Lesser General Public License */
24 /* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
25 /* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
26 /* */
27 /* The copyright holder's institutional names and contributor's names may not */
28 /* be used to endorse or promote products derived from this software without */
29 /* specific prior written permission of the institution or contributor. */
30 /******************************************************************************/
31 
32 #include <cstdlib>
33 #include <unistd.h>
34 #include <sys/types.h>
35 #include "XrdSys/XrdSysPthread.hh"
36 
37 /******************************************************************************/
38 /* x r d _ B u f f e r */
39 /******************************************************************************/
40 
41 class XrdBuffer
42 {
43 public:
44 
45 char * buff; // -> buffer
46 int bsize; // size of this buffer
47 
48  XrdBuffer(char *bp, int sz, int ix)
49  {buff = bp; bsize = sz; bindex = ix; next = 0;}
50 
51  ~XrdBuffer() {if (buff) free(buff);}
52 
53  friend class XrdBuffManager;
54  friend class XrdBuffXL;
55 private:
56 
57 int bindex;
58 XrdBuffer *next;
59 static int pagesz;
60 };
61 
62 /******************************************************************************/
63 /* x r d _ B u f f M a n a g e r */
64 /******************************************************************************/
65 
66 #define XRD_BUCKETS 12
67 #define XRD_BUSHIFT 10
68 
69 // There should be only one instance of this class per buffer pool.
70 //
72 {
73 public:
74 
75 void Init();
76 
77 XrdBuffer *Obtain(int bsz);
78 
79 int Recalc(int bsz);
80 
81 void Release(XrdBuffer *bp);
82 
83 int MaxSize() {return maxsz;}
84 
85 void Reshape();
86 
87 void Set(int maxmem=-1, int minw=-1);
88 
89 int Stats(char *buff, int blen, int do_sync=0);
90 
91  XrdBuffManager(int minrst=20*60);
92 
93  ~XrdBuffManager(); // The buffmanager is never deleted
94 
95 private:
96 
97 const int slots;
98 const int shift;
99 const int pagsz;
100 const int maxsz;
101 
102 struct {XrdBuffer *bnext;
103  int numbuf;
104  int numreq;
105  } bucket[XRD_BUCKETS]; // 1K to 1<<(szshift+slots-1)M buffers
106 
107 int totreq;
108 int totbuf;
109 long long totalo;
110 long long maxalo;
111 int minrsw;
112 int rsinprog;
113 int totadj;
114 
115 XrdSysCondVar Reshaper;
116 static const char *TraceID;
117 };
118 #endif
#define XRD_BUCKETS
Definition: XrdBuffer.hh:66
void Reshape()
Definition: XrdBuffer.cc:242
int Stats(char *buff, int blen, int do_sync=0)
Definition: XrdBuffer.cc:323
void Release(XrdBuffer *bp)
Definition: XrdBuffer.cc:221
int Recalc(int bsz)
Definition: XrdBuffer.cc:195
XrdBuffer * Obtain(int bsz)
Definition: XrdBuffer.cc:140
XrdBuffManager(int minrst=20 *60)
Definition: XrdBuffer.cc:78
void Set(int maxmem=-1, int minw=-1)
Definition: XrdBuffer.cc:308
~XrdBuffer()
Definition: XrdBuffer.hh:51
XrdBuffer(char *bp, int sz, int ix)
Definition: XrdBuffer.hh:48
int bsize
Definition: XrdBuffer.hh:46
char * buff
Definition: XrdBuffer.hh:45