xrootd
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros
XrdCpMthrQueue.hh
Go to the documentation of this file.
1 #ifndef XRDCPMTHRQ__HH
2 #define XRDCPMTHRQ__HH
3 /******************************************************************************/
4 /* */
5 /* X r d C p M t h r Q u e u e . h h */
6 /* */
7 /* Author: Fabrizio Furano (INFN Padova, 2004) */
8 /* */
9 /* This file is part of the XRootD software suite. */
10 /* */
11 /* XRootD is free software: you can redistribute it and/or modify it under */
12 /* the terms of the GNU Lesser General Public License as published by the */
13 /* Free Software Foundation, either version 3 of the License, or (at your */
14 /* option) any later version. */
15 /* */
16 /* XRootD is distributed in the hope that it will be useful, but WITHOUT */
17 /* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
18 /* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
19 /* License for more details. */
20 /* */
21 /* You should have received a copy of the GNU Lesser General Public License */
22 /* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
23 /* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
24 /* */
25 /* The copyright holder's institutional names and contributor's names may not */
26 /* be used to endorse or promote products derived from this software without */
27 /* specific prior written permission of the institution or contributor. */
28 /******************************************************************************/
29 
31 // //
32 // A thread safe queue to be used for multithreaded producers-consumers //
33 // //
35 
36 #include "XrdSys/XrdSysPthread.hh"
38 #include "XrdSys/XrdSysSemWait.hh"
39 #include "XrdSys/XrdSysHeaders.hh"
40 
41 using namespace std;
42 
43 struct XrdCpMessage {
44  void *buf;
45  long long offs;
46  int len;
47 };
48 
49 // The max allowed size for this queue
50 // If this value is reached, then the writer has to wait...
51 #define CPMTQ_BUFFSIZE 50000000
52 
54  private:
55  long fTotSize;
56  XrdClientVector<XrdCpMessage*> fMsgQue; // queue for incoming messages
57  int fMsgIter; // an iterator on it
58  int fWrWait; // Write waiters
59 
60  XrdSysRecMutex fMutex; // mutex to protect data structures
61 
62  XrdSysSemWait fReadSem; // variable to make the reader wait
63  // until some data is available
64  XrdSysSemaphore fWriteSem; // variable to make the writer wait
65  // if the queue is full
66  public:
67 
70 
71  int PutBuffer(void *buf, long long offs, int len);
72  int GetBuffer(void **buf, long long &offs, int &len);
73  int GetLength() { return fMsgQue.GetSize(); }
74  void Clear();
75 };
76 #endif
Definition: XrdSysPthread.hh:239
long long offs
Definition: XrdCpMthrQueue.hh:45
XrdSysSemaphore fWriteSem
Definition: XrdCpMthrQueue.hh:64
int fMsgIter
Definition: XrdCpMthrQueue.hh:57
int len
Definition: XrdCpMthrQueue.hh:46
void * buf
Definition: XrdCpMthrQueue.hh:44
XrdClientVector< XrdCpMessage * > fMsgQue
Definition: XrdCpMthrQueue.hh:56
XrdSysRecMutex fMutex
Definition: XrdCpMthrQueue.hh:60
~XrdCpMthrQueue()
Definition: XrdCpMthrQueue.hh:69
long fTotSize
Definition: XrdCpMthrQueue.hh:55
XrdSysSemWait fReadSem
Definition: XrdCpMthrQueue.hh:62
Definition: XrdCpMthrQueue.hh:53
Definition: XrdCpMthrQueue.hh:43
Definition: XrdSysPthread.hh:403
Definition: XrdSysSemWait.hh:34
int fWrWait
Definition: XrdCpMthrQueue.hh:58
int GetLength()
Definition: XrdCpMthrQueue.hh:73