1 mike 1.2 //%2006////////////////////////////////////////////////////////////////////////
2 //
3 // Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
4 // Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
5 // Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
6 // IBM Corp.; EMC Corporation, The Open Group.
7 // Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
8 // IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
9 // Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
10 // EMC Corporation; VERITAS Software Corporation; The Open Group.
11 // Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
12 // EMC Corporation; Symantec Corporation; The Open Group.
13 //
14 // Permission is hereby granted, free of charge, to any person obtaining a copy
15 // of this software and associated documentation files (the "Software"), to
16 // deal in the Software without restriction, including without limitation the
17 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
18 // sell copies of the Software, and to permit persons to whom the Software is
19 // furnished to do so, subject to the following conditions:
20 //
21 // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
22 mike 1.2 // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
23 // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
24 // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
25 // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
26 // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
27 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29 //
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30 kamal.locahana 1.4 //=============================================================================
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31 mike 1.2 //
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32 kamal.locahana 1.4 //%////////////////////////////////////////////////////////////////////////////
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33 mike 1.2
34 #ifndef Pegasus_ThreadPool_h
35 #define Pegasus_ThreadPool_h
36
37 #include <Pegasus/Common/Config.h>
38 #include <Pegasus/Common/Linkage.h>
39 #include <Pegasus/Common/Thread.h>
40
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41 kumpf 1.3 PEGASUS_NAMESPACE_BEGIN
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42 mike 1.2
43 class PEGASUS_COMMON_LINKAGE ThreadPool
44 {
45 public:
46
47 /**
48 Constructs a new ThreadPool object.
49 @param initialSize The number of threads that are initially added to
50 the thread pool.
51 @param key A name for this thread pool that can be used to determine
52 equality of two thread pool objects. Only the first 16 characters
53 of this value are used.
54 @param minThreads The minimum number of threads that should be
55 contained in this thread pool at any given time.
56 @param maxThreads The maximum number of threads that should be
57 contained in this thread pool at any given time.
58 @param deallocateWait The minimum time that a thread should be idle
59 before it is removed from the pool and cleaned up.
60 */
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61 kumpf 1.3 ThreadPool(
62 Sint16 initialSize,
63 const char* key,
64 Sint16 minThreads,
65 Sint16 maxThreads,
66 struct timeval& deallocateWait);
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67 mike 1.2
68 /**
69 Destructs the ThreadPool object.
70 */
71 ~ThreadPool();
72
73 /**
74 Allocate and start a thread to do a unit of work.
75 @param parm A generic parameter to pass to the thread
76 @param work A pointer to the function that is to be executed by
77 the thread
78 @param blocking A pointer to an optional semaphore which, if
79 specified, is signaled after the thread finishes
80 executing the work function
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81 kumpf 1.3 @return PEGASUS_THREAD_OK if the thread is started successfully,
82 PEGASUS_THREAD_INSUFFICIENT_RESOURCES if the
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83 mike 1.2 resources necessary to start the thread are not currently
84 available. PEGASUS_THREAD_SETUP_FAILURE if the thread
85 could not be setup properly. PEGASUS_THREAD_UNAVAILABLE
86 if this service is shutting down and no more threads can
87 be allocated.
88 @exception IPCException
89 */
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90 kumpf 1.3 ThreadStatus allocate_and_awaken(
91 void* parm,
92 ThreadReturnType(PEGASUS_THREAD_CDECL* work) (void*),
93 Semaphore* blocking = 0);
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94 mike 1.2
95 /**
96 Cleans up idle threads if they have been running longer than the
97 deallocate_wait configuration and more than the configured
98 minimum number of threads is running.
99 @return The number of threads that were cleaned up.
100 @exception IPCException
101 */
102 Uint32 cleanupIdleThreads();
103
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104 kumpf 1.3 void get_key(Sint8* buf, int bufsize);
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105 mike 1.2
106 inline void setMinThreads(Sint16 min)
107 {
108 _minThreads = min;
109 }
110
111 inline Sint16 getMinThreads() const
112 {
113 return _minThreads;
114 }
115
116 inline void setMaxThreads(Sint16 max)
117 {
118 _maxThreads = max;
119 }
120
121 inline Sint16 getMaxThreads() const
122 {
123 return _maxThreads;
124 }
125
126 mike 1.2 inline Uint32 runningCount()
127 {
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128 kamal.locahana 1.4 return (Uint32) _runningThreads.size();
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129 mike 1.2 }
130
131 inline Uint32 idleCount()
132 {
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133 kamal.locahana 1.4 return (Uint32) _idleThreads.size();
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134 mike 1.2 }
135
136 private:
137
138 ThreadPool(); // Unimplemented
139 ThreadPool(const ThreadPool &); // Unimplemented
140 ThreadPool & operator=(const ThreadPool &); // Unimplemented
141
142 static ThreadReturnType PEGASUS_THREAD_CDECL _loop(void *);
143
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144 kumpf 1.3 static Boolean _timeIntervalExpired(
145 struct timeval* start,
146 struct timeval* interval);
147
148 static void _deleteSemaphore(void* p);
149
150 void _cleanupThread(Thread* thread);
151 Thread* _initializeThread();
152 void _addToIdleThreadsQueue(Thread* th);
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153 mike 1.2
154 Sint16 _maxThreads;
155 Sint16 _minThreads;
156 AtomicInt _currentThreads;
157 struct timeval _deallocateWait;
158 char _key[17];
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159 kumpf 1.3 List<Thread, Mutex> _idleThreads;
160 List<Thread, Mutex> _runningThreads;
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161 mike 1.2 AtomicInt _dying;
162 };
163
164 PEGASUS_NAMESPACE_END
165
166 #endif // Pegasus_ThreadPool_h
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Return to
ThreadPool.h
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