Qore Programming Language  0.9.3.1
QoreCounter.h
1 /* -*- mode: c++; indent-tabs-mode: nil -*- */
2 /*
3  QoreCounter.h
4 
5  Qore Programming Language
6 
7  Copyright (C) 2005 - 2017 Qore Technologies, s.r.o.
8 
9  Permission is hereby granted, free of charge, to any person obtaining a
10  copy of this software and associated documentation files (the "Software"),
11  to deal in the Software without restriction, including without limitation
12  the rights to use, copy, modify, merge, publish, distribute, sublicense,
13  and/or sell copies of the Software, and to permit persons to whom the
14  Software is furnished to do so, subject to the following conditions:
15 
16  The above copyright notice and this permission notice shall be included in
17  all copies or substantial portions of the Software.
18 
19  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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24  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25  DEALINGS IN THE SOFTWARE.
26 
27  Note that the Qore library is released under a choice of three open-source
28  licenses: MIT (as above), LGPL 2+, or GPL 2+; see README-LICENSE for more
29  information.
30 */
31 
32 #ifndef _QORE_QORECOUNTER_H
33 
34 #define _QORE_QORECOUNTER_H
35 
36 #include <qore/Qore.h>
37 #include <qore/QoreCondition.h>
38 
40 class QoreCounter {
41 private:
43  hashdecl qore_counter_private* priv;
44 
46  DLLLOCAL QoreCounter(const QoreCounter&);
47 
49  DLLLOCAL QoreCounter& operator=(const QoreCounter&);
50 
51 public:
53  DLLEXPORT QoreCounter(int nc = 0);
54 
56  DLLEXPORT ~QoreCounter();
57 
59  DLLEXPORT void destructor(ExceptionSink* xsink);
60 
62 
66  DLLEXPORT int inc();
67 
69 
77  DLLEXPORT int dec(ExceptionSink* xsink);
78 
80 
87  DLLEXPORT int waitForZero(ExceptionSink* xsink, int timeout_ms = 0);
88 
90  DLLEXPORT int getCount() const;
91 
93  DLLEXPORT int getWaiting() const;
94 
95  // internal use only - for internal counters
96  DLLLOCAL void waitForZero();
97  DLLLOCAL void dec();
98 };
99 
100 #endif
a simple thread-safe counter object; objects can block on it until the counter reaches zero ...
Definition: QoreCounter.h:40
DLLEXPORT ~QoreCounter()
destroys the object and frees all memory
DLLEXPORT int dec(ExceptionSink *xsink)
decrements the counter and wakes up any threads if the counter reaches 0
DLLEXPORT int getCount() const
returns the current count
container for holding Qore-language exception information and also for registering a "thread_exit" ca...
Definition: ExceptionSink.h:46
DLLEXPORT int inc()
increments the counter
DLLEXPORT void destructor(ExceptionSink *xsink)
throws a Qore-language exception if there are any waiting threads and wakes them all up ...
DLLEXPORT int waitForZero(ExceptionSink *xsink, int timeout_ms=0)
blocks the calling thread until the counter reaches 0
DLLEXPORT int getWaiting() const
returns the number of threads blocked on this object