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6580df1c | 1 | // $Id$ |
2 | ||
3 | /************************************************************************** | |
4 | * This file is property of and copyright by the ALICE HLT Project * | |
5 | * ALICE Experiment at CERN, All rights reserved. * | |
6 | * * | |
7 | * Primary Authors: Matthias Richter <Matthias.Richter@ift.uib.no> * | |
8 | * for The ALICE HLT Project. * | |
9 | * * | |
10 | * Permission to use, copy, modify and distribute this software and its * | |
11 | * documentation strictly for non-commercial purposes is hereby granted * | |
12 | * without fee, provided that the above copyright notice appears in all * | |
13 | * copies and that both the copyright notice and this permission notice * | |
14 | * appear in the supporting documentation. The authors make no claims * | |
15 | * about the suitability of this software for any purpose. It is * | |
16 | * provided "as is" without express or implied warranty. * | |
17 | **************************************************************************/ | |
18 | ||
c012695e | 19 | /// @file AliHLTHOMERLibManager.cxx |
20 | /// @author Matthias Richter | |
21 | /// @date | |
22 | /// @brief dynamic HLT HOMER reader/writer generation and destruction. | |
6580df1c | 23 | |
24 | #include <cerrno> | |
25 | #include <cassert> | |
26 | #include "AliHLTHOMERLibManager.h" | |
27 | #include "AliHLTHOMERReader.h" | |
28 | #include "AliHLTHOMERWriter.h" | |
1b820a65 | 29 | #include "AliHLTLogging.h" |
6580df1c | 30 | #include "TString.h" |
31 | #include "TSystem.h" | |
32 | ||
33 | /** ROOT macro for the implementation of ROOT specific class methods */ | |
34 | ClassImp(AliHLTHOMERLibManager) | |
35 | ||
c012695e | 36 | // global flag of the library status |
37 | int AliHLTHOMERLibManager::fgLibraryStatus=0; | |
1b820a65 | 38 | // This list must be NULL terminated, since we use it as a marker to identify |
39 | // the end of the list. | |
40 | const char* AliHLTHOMERLibManager::fgkLibraries[] = {"libAliHLTHOMER.so", "libHOMER.so", NULL}; | |
41 | // The size of the list of reference counts must be one less than fgkLibraries. | |
42 | int AliHLTHOMERLibManager::fgkLibRefCount[] = {0, 0}; | |
43 | ||
6580df1c | 44 | AliHLTHOMERLibManager::AliHLTHOMERLibManager() |
45 | : | |
a183f221 | 46 | fFctCreateReaderFromTCPPort(NULL), |
47 | fFctCreateReaderFromTCPPorts(NULL), | |
6580df1c | 48 | fFctCreateReaderFromBuffer(NULL), |
49 | fFctDeleteReader(NULL), | |
50 | fFctCreateWriter(NULL), | |
1b820a65 | 51 | fFctDeleteWriter(NULL), |
52 | fLoadedLib(NULL) | |
6580df1c | 53 | { |
c012695e | 54 | // constructor |
55 | // | |
56 | // Interface to the HLT Online Monitoring Including Root (HOMER) library. | |
57 | // It allows to decouple the HLT base library from this additional library | |
58 | // while providing the basic functionality to the component libraries | |
6580df1c | 59 | } |
60 | ||
61 | AliHLTHOMERLibManager::~AliHLTHOMERLibManager() | |
62 | { | |
c012695e | 63 | // destructor |
64 | // | |
65 | // the library load strategy has been changed in March 2013 in order to | |
66 | // stabilize the runtime memory layout of AliRoot in an attemp to get control | |
67 | // over memory corruptions | |
68 | // UnloadHOMERLibrary(); | |
6580df1c | 69 | } |
70 | ||
a183f221 | 71 | AliHLTHOMERReader* AliHLTHOMERLibManager::OpenReader(const char* hostname, unsigned short port ) |
72 | { | |
c012695e | 73 | // Open Reader instance for host |
74 | if (fgLibraryStatus<0) return NULL; | |
a183f221 | 75 | |
8779105a | 76 | fgLibraryStatus=LoadHOMERLibrary(); |
77 | if (fgLibraryStatus <= 0) { | |
78 | return NULL; | |
a183f221 | 79 | } |
80 | ||
81 | AliHLTHOMERReader* pReader=NULL; | |
82 | if (fFctCreateReaderFromTCPPort!=NULL && (pReader=(((AliHLTHOMERReaderCreateFromTCPPort_t)fFctCreateReaderFromTCPPort)(hostname, port)))==NULL) { | |
cfa641b1 | 83 | cout <<"can not create instance of HOMER reader from ports" << endl; |
a183f221 | 84 | } |
85 | ||
86 | return pReader; | |
87 | } | |
88 | ||
89 | AliHLTHOMERReader* AliHLTHOMERLibManager::OpenReader(unsigned int tcpCnt, const char** hostnames, unsigned short* ports) | |
90 | { | |
c012695e | 91 | // Open Reader instance for a list of hosts |
92 | if (fgLibraryStatus<0) return NULL; | |
a183f221 | 93 | |
8779105a | 94 | fgLibraryStatus=LoadHOMERLibrary(); |
95 | if (fgLibraryStatus <= 0) { | |
96 | return NULL; | |
a183f221 | 97 | } |
98 | ||
99 | AliHLTHOMERReader* pReader=NULL; | |
100 | if (fFctCreateReaderFromTCPPorts!=NULL && (pReader=(((AliHLTHOMERReaderCreateFromTCPPorts_t)fFctCreateReaderFromTCPPorts)(tcpCnt, hostnames, ports)))==NULL) { | |
cef34fbe | 101 | //HLTError("can not create instance of HOMER reader (function %p)", fFctCreateReaderFromTCPPorts); |
cfa641b1 | 102 | cout << "can not create instance of HOMER reader from port"<<endl; |
a183f221 | 103 | } |
104 | ||
105 | return pReader; | |
106 | } | |
107 | ||
18b56222 | 108 | AliHLTHOMERReader* AliHLTHOMERLibManager::OpenReaderBuffer(const AliHLTUInt8_t* pBuffer, int size) |
6580df1c | 109 | { |
c012695e | 110 | // Open Reader instance for a data buffer |
111 | if (fgLibraryStatus<0) return NULL; | |
6580df1c | 112 | |
8779105a | 113 | fgLibraryStatus=LoadHOMERLibrary(); |
114 | if (fgLibraryStatus <= 0) { | |
115 | return NULL; | |
6580df1c | 116 | } |
117 | ||
118 | AliHLTHOMERReader* pReader=NULL; | |
119 | if (fFctCreateReaderFromBuffer!=NULL && (pReader=(((AliHLTHOMERReaderCreateFromBuffer_t)fFctCreateReaderFromBuffer)(pBuffer, size)))==NULL) { | |
cef34fbe | 120 | //HLTError("can not create instance of HOMER reader (function %p)", fFctCreateReaderFromBuffer); |
6580df1c | 121 | } |
122 | ||
123 | return pReader; | |
124 | } | |
125 | ||
126 | int AliHLTHOMERLibManager::DeleteReader(AliHLTHOMERReader* pReader) | |
127 | { | |
c012695e | 128 | // delete a reader |
129 | ||
130 | // the actual deletion function is inside the HOMER library | |
131 | if (fgLibraryStatus<0) return fgLibraryStatus; | |
6580df1c | 132 | |
8779105a | 133 | fgLibraryStatus=LoadHOMERLibrary(); |
134 | if (fgLibraryStatus <= 0) { | |
135 | return fgLibraryStatus; | |
6580df1c | 136 | } |
137 | ||
138 | if (fFctDeleteReader!=NULL) { | |
139 | ((AliHLTHOMERReaderDelete_t)fFctDeleteReader)(pReader); | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | AliHLTHOMERWriter* AliHLTHOMERLibManager::OpenWriter() | |
146 | { | |
c012695e | 147 | // open a Writer instance |
148 | if (fgLibraryStatus<0) return NULL; | |
6580df1c | 149 | |
8779105a | 150 | fgLibraryStatus=LoadHOMERLibrary(); |
151 | if (fgLibraryStatus <= 0) { | |
152 | return NULL; | |
6580df1c | 153 | } |
154 | ||
155 | AliHLTHOMERWriter* pWriter=NULL; | |
77fe3666 | 156 | if (fFctCreateWriter!=NULL && (pWriter=(((AliHLTHOMERWriterCreate_t)fFctCreateWriter)()))==NULL) { |
6580df1c | 157 | // HLTError("can not create instance of HOMER writer (function %p)", fFctCreateWriter); |
77fe3666 | 158 | } |
6580df1c | 159 | |
160 | return pWriter; | |
161 | } | |
162 | ||
163 | int AliHLTHOMERLibManager::DeleteWriter(AliHLTHOMERWriter* pWriter) | |
164 | { | |
165 | // see header file for class documentation | |
c012695e | 166 | if (fgLibraryStatus<0) return fgLibraryStatus; |
6580df1c | 167 | |
8779105a | 168 | fgLibraryStatus=LoadHOMERLibrary(); |
169 | if (fgLibraryStatus <= 0) { | |
170 | return fgLibraryStatus; | |
6580df1c | 171 | } |
172 | ||
173 | if (fFctDeleteWriter!=NULL) { | |
174 | ((AliHLTHOMERWriterDelete_t)fFctDeleteWriter)(pWriter); | |
175 | } | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | int AliHLTHOMERLibManager::LoadHOMERLibrary() | |
181 | { | |
c012695e | 182 | // delete a writer |
183 | ||
184 | // the actual deletion function is inside the HOMER library | |
6580df1c | 185 | int iResult=-EBADF; |
1b820a65 | 186 | const char** library=&fgkLibraries[0]; |
187 | int* refcount = &fgkLibRefCount[0]; | |
6580df1c | 188 | do { |
189 | TString libs = gSystem->GetLibraries(); | |
ac3389e3 | 190 | if (libs.Contains(*library) || |
191 | (gSystem->Load(*library)) >= 0) { | |
1b820a65 | 192 | ++(*refcount); |
193 | fLoadedLib = *library; | |
6580df1c | 194 | iResult=1; |
195 | break; | |
196 | } | |
1b820a65 | 197 | ++library; |
198 | ++refcount; | |
199 | } while ((*library)!=NULL); | |
6580df1c | 200 | |
201 | if (iResult>0 && *library!=NULL) { | |
202 | // print compile info | |
203 | typedef void (*CompileInfo)( char*& date, char*& time); | |
6580df1c | 204 | |
d93ec7ca | 205 | fFctCreateReaderFromTCPPort=(void (*)())gSystem->DynFindSymbol(*library, ALIHLTHOMERREADER_CREATE_FROM_TCPPORT); |
206 | fFctCreateReaderFromTCPPorts=(void (*)())gSystem->DynFindSymbol(*library, ALIHLTHOMERREADER_CREATE_FROM_TCPPORTS); | |
207 | fFctCreateReaderFromBuffer=(void (*)())gSystem->DynFindSymbol(*library, ALIHLTHOMERREADER_CREATE_FROM_BUFFER); | |
208 | fFctDeleteReader=(void (*)())gSystem->DynFindSymbol(*library, ALIHLTHOMERREADER_DELETE); | |
209 | fFctCreateWriter=(void (*)())gSystem->DynFindSymbol(*library, ALIHLTHOMERWRITER_CREATE); | |
210 | fFctDeleteWriter=(void (*)())gSystem->DynFindSymbol(*library, ALIHLTHOMERWRITER_DELETE); | |
a183f221 | 211 | if (fFctCreateReaderFromTCPPort==NULL || |
212 | fFctCreateReaderFromTCPPorts==NULL || | |
213 | fFctCreateReaderFromBuffer==NULL || | |
214 | fFctDeleteReader==NULL || | |
215 | fFctCreateWriter==NULL || | |
216 | fFctDeleteWriter==NULL) { | |
6580df1c | 217 | iResult=-ENOSYS; |
218 | } else { | |
6580df1c | 219 | } |
220 | } | |
221 | if (iResult<0 || *library==NULL) { | |
a183f221 | 222 | fFctCreateReaderFromTCPPort=NULL; |
223 | fFctCreateReaderFromTCPPorts=NULL; | |
6580df1c | 224 | fFctCreateReaderFromBuffer=NULL; |
225 | fFctDeleteReader=NULL; | |
226 | fFctCreateWriter=NULL; | |
227 | fFctDeleteWriter=NULL; | |
228 | } | |
229 | ||
230 | return iResult; | |
231 | } | |
1b820a65 | 232 | |
233 | int AliHLTHOMERLibManager::UnloadHOMERLibrary() | |
234 | { | |
c012695e | 235 | // unload HOMER library |
1b820a65 | 236 | int iResult=0; |
237 | ||
238 | if (fLoadedLib != NULL) | |
239 | { | |
240 | // Find the corresponding reference count. | |
241 | const char** library=&fgkLibraries[0]; | |
242 | int* refcount = &fgkLibRefCount[0]; | |
243 | while (*library != NULL) | |
244 | { | |
245 | if (strcmp(*library, fLoadedLib) == 0) break; | |
246 | ++library; | |
247 | ++refcount; | |
248 | } | |
249 | ||
250 | // Decrease the reference count and remove the library if it is zero. | |
251 | if (*refcount >= 0) --(*refcount); | |
252 | if (*refcount == 0) | |
253 | { | |
254 | // Check that the library we are trying to unload is actually the last library | |
255 | // in the gSystem->GetLibraries() list. If not then we must abort the removal. | |
256 | // This is because of a ROOT bug/feature/limitation. If we try unload the library | |
257 | // then ROOT will also wipe all libraries in the gSystem->GetLibraries() list | |
258 | // following the library we want to unload. | |
259 | TString libstring = gSystem->GetLibraries(); | |
260 | TString token, lastlib; | |
261 | Ssiz_t from = 0; | |
262 | Int_t numOfLibs = 0, posOfLib = -1; | |
263 | while (libstring.Tokenize(token, from, " ")) | |
264 | { | |
265 | ++numOfLibs; | |
266 | lastlib = token; | |
267 | if (token.Contains(fLoadedLib)) posOfLib = numOfLibs; | |
268 | } | |
269 | if (numOfLibs == posOfLib) | |
270 | { | |
271 | gSystem->Unload(fLoadedLib); | |
272 | ||
273 | // Check that the library is gone, since Unload() does not return a status code. | |
274 | libstring = gSystem->GetLibraries(); | |
275 | if (libstring.Contains(fLoadedLib)) iResult = -EBADF; | |
276 | } | |
277 | else | |
278 | { | |
279 | AliHLTLogging log; | |
280 | log.LoggingVarargs(kHLTLogWarning, Class_Name(), FUNCTIONNAME(), __FILE__, __LINE__, | |
281 | Form("ROOT limitation! Cannot properly cleanup and unload the shared" | |
282 | " library '%s' since another library '%s' was loaded afterwards. Trying to" | |
283 | " unload this library will remove the others and lead to serious memory faults.", | |
284 | fLoadedLib, lastlib.Data() | |
285 | )); | |
286 | } | |
287 | } | |
288 | } | |
289 | ||
290 | // Clear the function pointers. | |
291 | fFctCreateReaderFromTCPPort = NULL; | |
292 | fFctCreateReaderFromTCPPorts = NULL; | |
293 | fFctCreateReaderFromBuffer = NULL; | |
294 | fFctDeleteReader = NULL; | |
295 | fFctCreateWriter = NULL; | |
296 | fFctDeleteWriter = NULL; | |
297 | ||
298 | return iResult; | |
299 | } |