bes Updated for version 3.20.13
BESMemoryManager.cc
1// BESMemoryManager.cc
2
3// This file is part of bes, A C++ back-end server implementation framework
4// for the OPeNDAP Data Access Protocol.
5
6// Copyright (c) 2004-2009 University Corporation for Atmospheric Research
7// Author: Patrick West <pwest@ucar.edu> and Jose Garcia <jgarcia@ucar.edu>
8//
9// This library is free software; you can redistribute it and/or
10// modify it under the terms of the GNU Lesser General Public
11// License as published by the Free Software Foundation; either
12// version 2.1 of the License, or (at your option) any later version.
13//
14// This library is distributed in the hope that it will be useful,
15// but WITHOUT ANY WARRANTY; without even the implied warranty of
16// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17// Lesser General Public License for more details.
18//
19// You should have received a copy of the GNU Lesser General Public
20// License along with this library; if not, write to the Free Software
21// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22//
23// You can contact University Corporation for Atmospheric Research at
24// 3080 Center Green Drive, Boulder, CO 80301
25
26// (c) COPYRIGHT University Corporation for Atmospheric Research 2004-2005
27// Please read the full copyright statement in the file COPYRIGHT_UCAR.
28//
29// Authors:
30// pwest Patrick West <pwest@ucar.edu>
31// jgarcia Jose Garcia <jgarcia@ucar.edu>
32
33#include "config.h"
34
35#include <iostream>
36
37#if 0
38using std::endl;
39using std::set_new_handler;
40#endif
41
42
43#include "BESMemoryManager.h"
44
45#include "BESLog.h"
46#include "BESDebug.h"
47#include "BESMemoryGlobalArea.h"
48#include "BESError.h"
49
50using namespace std;
51
52BESMemoryGlobalArea* BESMemoryManager::_memory;
53bool BESMemoryManager::_storage_used(false);
54new_handler BESMemoryManager::_global_handler;
55
57BESMemoryManager::initialize_memory_pool()
58{
59 static BESMemoryGlobalArea mem ;
60 _memory = &mem ;
61 return _memory ;
62}
63
64void
65BESMemoryManager::register_global_pool()
66{
67 _global_handler = set_new_handler( BESMemoryManager::swap_memory ) ;
68}
69
70void
71BESMemoryManager::swap_memory()
72{
73 INFO_LOG("BESMemoryManager::This is just a simulation, here we tell BES to go to persistence state" << endl);
74 set_new_handler( BESMemoryManager::release_global_pool ) ;
75}
76
77bool
78BESMemoryManager::unregister_global_pool()
79{
80 if( check_memory_pool() )
81 {
82 set_new_handler( _global_handler ) ;
83 return true ;
84 } else {
85 return false ;
86 }
87}
88
89bool
90BESMemoryManager::check_memory_pool()
91{
92 if( _storage_used )
93 {
94 BESDEBUG( "bes", "BES: global pool is used, trying to get it back..." << endl ) ;
95 //Try to regain the memory...
96 if( _memory->reclaim_memory() )
97 {
98 _storage_used = false ;
99 BESDEBUG( "bes", "OK" << endl ) ;
100 return true ;
101 }
102 else
103 {
104 BESDEBUG( "bes", "FAILED" << endl ) ;
105 return false ;
106 }
107 }
108 return true ;
109}
110
111void
112BESMemoryManager::release_global_pool() throw (bad_alloc)
113{
114 try {
115 // This is really the final resource for BES since therefore
116 // this method must be second level handler.
117 // It releases enough memory for an exception sequence to be carried.
118 // Without this pool of memory for emergencies we will get really
119 // unexpected behavior from the program.
120 BESDEBUG("bes", "BES Warning: low in memory, " << "releasing global memory pool!" << endl);
121
122 INFO_LOG("BES Warning: low in memory, " << "releasing global memory pool!" << endl);
123 }
124 catch (BESError &e) {
125 // At this point, exceptions are pretty moot.
126 cerr << "Exception while trying to release the global memory pool. (" << e.get_verbose_message() << ").";
127 }
128 catch (...) {
129 cerr << "Exception while trying to release the global memory pool.";
130 }
131
132 _storage_used = true ;
133 _memory->release_memory() ;
134
135 // Do not let the caller of this memory consume the global pool for
136 // normal stuff this is an emergency.
137 set_new_handler( 0 ) ;
138 throw bad_alloc() ;
139}
140
Base exception class for the BES with basic string message.
Definition: BESError.h:59