xrootd
XrdXrootdAio.hh
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1 #ifndef __XRDXROOTDAIO__
2 #define __XRDXROOTDAIO__
3 /******************************************************************************/
4 /* */
5 /* X r d X r o o t d A i o . h h */
6 /* */
7 /* (c) 2004 by the Board of Trustees of the Leland Stanford, Jr., University */
8 /* All Rights Reserved */
9 /* Produced by Andrew Hanushevsky for Stanford University under contract */
10 /* DE-AC02-76-SFO0515 with the Department of Energy */
11 /* */
12 /* This file is part of the XRootD software suite. */
13 /* */
14 /* XRootD is free software: you can redistribute it and/or modify it under */
15 /* the terms of the GNU Lesser General Public License as published by the */
16 /* Free Software Foundation, either version 3 of the License, or (at your */
17 /* option) any later version. */
18 /* */
19 /* XRootD is distributed in the hope that it will be useful, but WITHOUT */
20 /* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
21 /* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
22 /* License for more details. */
23 /* */
24 /* You should have received a copy of the GNU Lesser General Public License */
25 /* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
26 /* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
27 /* */
28 /* The copyright holder's institutional names and contributor's names may not */
29 /* be used to endorse or promote products derived from this software without */
30 /* specific prior written permission of the institution or contributor. */
31 /******************************************************************************/
32 
33 #include "XProtocol/XPtypes.hh"
34 #include "XrdSys/XrdSysPthread.hh"
35 #include "XrdSfs/XrdSfsAio.hh"
36 #include "Xrd/XrdScheduler.hh"
37 #include "XrdXrootd/XrdXrootdResponse.hh"
38 
39 /******************************************************************************/
40 /* X r d X r o o t d A i o */
41 /******************************************************************************/
42 
43 // The XrdXrootdAio object represents a single aio read or write operation. One
44 // or more of these are allocated to the XrdXrootdAioReq and passed as upcast
45 // arguments to the sfs file object to effect asynchronous I/O.
46 
47 class XrdBuffer;
48 class XrdBuffManager;
49 class XrdSysError;
50 class XrdXrootdAioReq;
51 class XrdXrootdStats;
52 
53 class XrdXrootdAio : public XrdSfsAio
54 {
55 friend class XrdXrootdAioReq;
56 public:
57  XrdBuffer *buffp; // -> Buffer object
58 
59 virtual void doneRead();
60 
61 virtual void doneWrite();
62 
63 virtual void Recycle();
64 
65 
66  XrdXrootdAio() {Next=0; aioReq=0; buffp=0;}
67  ~XrdXrootdAio() {};
68 
69 private:
70 
71 static XrdXrootdAio *Alloc(XrdXrootdAioReq *arp, int bsize=0);
72 static XrdXrootdAio *addBlock();
73 
74 static const char *TraceID;
75 static XrdBuffManager *BPool; // -> Buffer Manager
76 static XrdScheduler *Sched; // -> System Scheduler
77 static XrdXrootdStats *SI; // -> System Statistics
78 static XrdSysMutex fqMutex; // Locks static data
79 static XrdXrootdAio *fqFirst; // -> Object in free queue
80 static int maxAio; // Maximum Aio objects we can yet have
81 
82  XrdXrootdAio *Next; // Chain pointer
83  XrdXrootdAioReq *aioReq; // -> Associated request object
84 };
85 
86 /******************************************************************************/
87 /* X r d X r o o t d A i o R e q */
88 /******************************************************************************/
89 
90 // The XrdXrootdAioReq object represents a complete aio request. It handles
91 // the appropriate translation of the synchrnous request to an async one,
92 // provides the redrive logic, and handles ending status.
93 //
94 class XrdLink;
95 class XrdXrootdFile;
96 class XrdXrootdProtocol;
97 
98 class XrdXrootdAioReq : public XrdJob
99 {
100 friend class XrdXrootdAio;
101 public:
102 
103 static XrdXrootdAioReq *Alloc(XrdXrootdProtocol *p, char iot, int numaio=0);
104 
105  void DoIt() {if (aioType == 'r') endRead();
106  else endWrite();
107  }
108 
109  XrdXrootdAio *getAio();
110 
111 inline XrdXrootdAio *Pop() {XrdXrootdAio *aiop = aioDone;
112  aioDone = aiop->Next; return aiop;
113  }
114 
115 inline void Push(XrdXrootdAio *newp)
116  {newp->Next = aioDone; aioDone = newp;}
117 
118 static void Init(int iosize, int maxaiopr, int maxaio=-80);
119 
120  int Read();
121 
122  void Recycle(int deref=1, XrdXrootdAio *aiop=0);
123 
124  int Write(XrdXrootdAio *aiop);
125 
126  XrdXrootdAioReq() : XrdJob("aio request") {}
127  ~XrdXrootdAioReq() {} // Never called
128 
129 private:
130 
131  void Clear(XrdLink *lnkp);
132 
133 static XrdXrootdAioReq *addBlock();
134  void endRead();
135  void endWrite();
136 inline void Lock() {aioMutex.Lock(); isLocked = 1;}
137  void Scuttle(const char *opname);
138  void sendError(char *tident);
139 inline void UnLock() {isLocked = 0; aioMutex.UnLock();}
140 
141 static const char *TraceID;
142 static XrdSysError *eDest; // -> Error Object
143 static XrdSysMutex rqMutex; // Locks static data
144 static XrdXrootdAioReq *rqFirst; // -> Object in free queue
145 static int QuantumMin; // aio segment size (Quantum/2)
146 static int Quantum; // aio segment size
147 static int QuantumMax; // aio segment size (Quantum*2)
148 static int maxAioPR; // aio objects per request (max)
149 static int maxAioPR2; // aio objects per request (max*2)
150 
151  XrdSysMutex aioMutex; // Locks private data
152  XrdXrootdAioReq *Next; // -> Chain pointer
153 
154  off_t myOffset; // Next offset (used for read's only)
155  int myIOLen; // Size remaining (read and write end)
156  unsigned int Instance; // Network Link Instance
157  XrdLink *Link; // -> Network link
158  XrdXrootdFile *myFile; // -> Associated file
159 
160  XrdXrootdAio *aioDone; // Next aiocb that completed
161  XrdXrootdAio *aioFree; // Next aiocb that we can use
162  int numActive; // Number of aio requests outstanding
163  int aioTotal; // Actual number of disk bytes transferred
164  int aioError; // First errno encounetered
165  char aioType; // 'r' or 'w' or 's'
166  char respDone; // 1 -> Response has been sent
167  char isLocked; // 1 -> Object lock being held
168  char reDrive; // 1 -> Link redrive is needed
169 
170  XrdXrootdResponse Response; // Copy of the original response object
171 };
172 #endif
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