xrootd
XrdCmsRRQ.hh
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1 #ifndef __XRDCMSRRQ_HH__
2 #define __XRDCMSRRQ_HH__
3 /******************************************************************************/
4 /* */
5 /* X r d C m s R R Q . h h */
6 /* */
7 /* (c) 2007 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 <sys/uio.h>
34 
35 #include "XProtocol/XPtypes.hh"
36 #include "XProtocol/YProtocol.hh"
37 
38 #include "XrdCms/XrdCmsTypes.hh"
39 #include "XrdOuc/XrdOucDLlist.hh"
40 #include "XrdSys/XrdSysPthread.hh"
41 
42 /******************************************************************************/
43 /* X r d C m s R R Q I n f o */
44 /******************************************************************************/
45 
46 class XrdCmsRRQInfo
47 {
48 public:
49 void *Key; // Key link, which is the cache line address
50 kXR_unt32 ID; // Response link, which is the request ID
51 int Rinst; // Redirector instance
52 short Rnum; // Redirector number (RTable slot number)
53 char isRW; // True if r/w access wanted
54 char isLU; // True if locate response wanted
55 char minR; // Minimum number of responses for fast redispatch
56 char actR; // Actual number of responses
57 short Rsvd;
58 SMask_t rwVec; // R/W servers for corresponding path (if isLU is true)
59 
60  XrdCmsRRQInfo() : isLU(0) {}
61  XrdCmsRRQInfo(int rinst, short rnum, kXR_unt32 id, int minQ=0)
62  : Key(0), ID(id), Rinst(rinst), Rnum(rnum),
63  isRW(0), isLU(0), minR(minQ), actR(0), Rsvd(0),
64  rwVec(0) {}
65  ~XrdCmsRRQInfo() {}
66 };
67 
68 /******************************************************************************/
69 /* X r d C m s R R Q S l o t */
70 /******************************************************************************/
71 
72 class XrdCmsRRQSlot
73 {
74 friend class XrdCmsRRQ;
75 
76 static XrdCmsRRQSlot *Alloc(XrdCmsRRQInfo *Info);
77 
78  void Recycle();
79 
80  XrdCmsRRQSlot();
81  ~XrdCmsRRQSlot() {}
82 
83 private:
84 
85 static XrdSysMutex myMutex;
86 static XrdCmsRRQSlot *freeSlot;
87 static short initSlot;
88 
89  XrdOucDLlist<XrdCmsRRQSlot> Link;
90  XrdCmsRRQSlot *Cont;
91  XrdCmsRRQSlot *LkUp;
92  XrdCmsRRQInfo Info;
93  SMask_t Arg1;
94  SMask_t Arg2;
95 unsigned int Expire;
96  int slotNum;
97 };
98 
99 /******************************************************************************/
100 /* X r d C m s R R Q */
101 /******************************************************************************/
102 
103 class XrdCmsRRQ
104 {
105 public:
106 
107 short Add(short Snum, XrdCmsRRQInfo *ip);
108 
109 void Del(short Snum, const void *Key);
110 
111 int Init(int Tint=0, int Tdly=0);
112 
113 int Ready(int Snum, const void *Key, SMask_t mask1, SMask_t mask2);
114 
115 void *Respond();
116 
117 struct Info
118  {long long Add2Q; // Number added to queue
119  long long PBack; // Number that we could piggy-back
120  long long Resp; // Number of reponses for a waiting request
121  long long Multi; // Number of multiple response fielded
122  long long luFast; // Fast lookups
123  long long luSlow; // Slow lookups
124  long long rdFast; // Fast redirects
125  long long rdSlow; // Slow redirects
126  };
127 
128 void Statistics(Info &Data) {myMutex.Lock(); Data = Stats; myMutex.UnLock();}
129 
130 void *TimeOut();
131 
132  XrdCmsRRQ() : isWaiting(0), isReady(0),
133  luFast(0), luSlow(0), rdFast(0), rdSlow(0),
134  Tslice(178), Tdelay(5), myClock(0) {}
135  ~XrdCmsRRQ() {}
136 
137 private:
138 
139 void sendLocResp(XrdCmsRRQSlot *lP);
140 void sendLwtResp(XrdCmsRRQSlot *rP);
141 void sendRedResp(XrdCmsRRQSlot *rP);
142 static const int numSlots = 1024;
143 
144  XrdSysMutex myMutex;
145  XrdSysSemaphore isWaiting;
146  XrdSysSemaphore isReady;
147  XrdCmsRRQSlot Slot[numSlots];
148  XrdOucDLlist<XrdCmsRRQSlot> waitQ;
149  XrdOucDLlist<XrdCmsRRQSlot> readyQ; // Redirect/Locate ready queue
150 static const int iov_cnt = 2;
151  struct iovec data_iov[iov_cnt];
152  struct iovec redr_iov[iov_cnt];
153  XrdCms::CmsResponse dataResp;
154  XrdCms::CmsResponse redrResp;
155  XrdCms::CmsResponse waitResp;
156 union {char hostbuff[288];
157  char databuff[XrdCms::CmsLocateRequest::RILen
158  *STMax];
159  };
160  Info Stats;
161  int luFast;
162  int luSlow;
163  int rdFast;
164  int rdSlow;
165  int Tslice;
166  int Tdelay;
167 unsigned int myClock;
168 };
169 
170 namespace XrdCms
171 {
172 extern XrdCmsRRQ RRQ;
173 }
174 #endif
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