XRootD
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XrdNetBuffer.cc
Go to the documentation of this file.
1/******************************************************************************/
2/* */
3/* X r d O u c B u f f e r . c c */
4/* */
5/* (c) 2004 by the Board of Trustees of the Leland Stanford, Jr., University */
6/* All Rights Reserved */
7/* Produced by Andrew Hanushevsky for Stanford University under contract */
8/* DE-AC02-76-SFO0515 with the Department of Energy */
9/* */
10/* This file is part of the XRootD software suite. */
11/* */
12/* XRootD is free software: you can redistribute it and/or modify it under */
13/* the terms of the GNU Lesser General Public License as published by the */
14/* Free Software Foundation, either version 3 of the License, or (at your */
15/* option) any later version. */
16/* */
17/* XRootD is distributed in the hope that it will be useful, but WITHOUT */
18/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
19/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
20/* License for more details. */
21/* */
22/* You should have received a copy of the GNU Lesser General Public License */
23/* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
24/* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
25/* */
26/* The copyright holder's institutional names and contributor's names may not */
27/* be used to endorse or promote products derived from this software without */
28/* specific prior written permission of the institution or contributor. */
29/******************************************************************************/
30
31#ifndef WIN32
32#include <unistd.h>
33#endif
34#include <sys/types.h>
35#include <cstdlib>
36
39
40/******************************************************************************/
41/* X r d N e t B u f f e r Q M e t h o d s */
42/******************************************************************************/
43/******************************************************************************/
44/* C o n s t r u c t o r */
45/******************************************************************************/
46
48{
49 size = bsz;
50 alignit = (size < sysconf(_SC_PAGESIZE)
51 ? size : sysconf(_SC_PAGESIZE));
52 maxbuff = maxb;
53 numbuff = 0;
54}
55
56/******************************************************************************/
57/* D e s t r u c t o r */
58/******************************************************************************/
59
61{
62 XrdNetBuffer *bp;
63
64 while((bp = BuffStack.Pop())) delete bp;
65}
66
67/******************************************************************************/
68/* A l l o c */
69/******************************************************************************/
70
72{
73 XrdNetBuffer *bp;
74
75// Lock the data area
76//
77 BuffList.Lock();
78
79// Either return a new buffer or an old one
80//
81 if ((bp = BuffStack.Pop())) numbuff--;
82 else if ((bp = new XrdNetBuffer(this))
83 && posix_memalign((void **)&(bp->data), alignit, size))
84 {delete bp; bp = 0;}
85
86// Unlock the data area
87//
89
90// Return the buffer
91//
92 return bp;
93}
94
95/******************************************************************************/
96/* R e c y c l e */
97/******************************************************************************/
98
100{
101
102// Check if we have enough objects, if so, delete ourselves and return
103//
104 if (numbuff >= maxbuff) {delete bp; return;}
105 bp->dlen = 0;
106
107// Add the buffer to the recycle list
108//
109 BuffList.Lock();
110 BuffStack.Push(&bp->BuffLink);
111 numbuff++;
113 return;
114}
115
116/******************************************************************************/
117/* S e t */
118/******************************************************************************/
119
120void XrdNetBufferQ::Set(int maxb)
121{
122
123// Lock the data area, set max buffers, unlock and return
124//
125 BuffList.Lock();
126 maxbuff = maxb;
128 return;
129}
130
131/******************************************************************************/
132/* X r d N e t B u f f e r M e t h o d s */
133/******************************************************************************/
134/******************************************************************************/
135/* C o n s t r u c t o r */
136/******************************************************************************/
137
139{
140 BuffQ= bq;
141 data = 0;
142 dlen = 0;
143}
XrdOucStack< XrdNetBuffer > BuffStack
XrdSysMutex BuffList
XrdNetBufferQ(int bsz, int maxb=16)
XrdNetBuffer * Alloc()
void Set(int maxb)
void Recycle(XrdNetBuffer *bp)
XrdNetBuffer(XrdNetBufferQ *bq)
void Push(XrdOucQSItem< T > *item)