Qore Programming Language  1.12.0
QC_AutoWriteLock.h
1 /* -*- mode: c++; indent-tabs-mode: nil -*- */
2 /*
3  QC_AutoWriteLock.h
4 
5  Qore Programming Language
6 
7  Copyright (C) 2003 - 2022 David Nichols
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
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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_QC_AUTOWRITELOCK_H
33 
34 #define _QORE_QC_AUTOWRITELOCK_H
35 
36 #include <qore/Qore.h>
37 #include "qore/intern/QC_RWLock.h"
38 
39 DLLEXPORT extern qore_classid_t CID_AUTOWRITELOCK;
40 DLLLOCAL extern QoreClass* QC_AUTOWRITELOCK;
41 DLLLOCAL QoreClass *initAutoWriteLockClass(QoreNamespace& ns);
42 
43 class QoreAutoWriteLock : public AbstractPrivateData {
44  RWLock *rwl;
45 
46 public:
47  DLLLOCAL QoreAutoWriteLock(RWLock *n_rwl, ExceptionSink *xsink) {
48  rwl = n_rwl;
49  rwl->grab(xsink);
50  }
51 
53  DLLLOCAL virtual void deref(ExceptionSink *xsink) {
54  if (ROdereference()) {
55  rwl->deref(xsink);
56  delete this;
57  }
58  }
59 
60  DLLLOCAL virtual void destructor(ExceptionSink *xsink) {
61  rwl->release(xsink);
62  }
63 };
64 
65 
66 #endif
the base class for all data to be used as private data of Qore objects
Definition: AbstractPrivateData.h:44
virtual DLLLOCAL void deref()
decrements the reference count of the object without the possibility of throwing a Qore-language exce...
Definition: AbstractPrivateData.h:65
container for holding Qore-language exception information and also for registering a "thread_exit" ca...
Definition: ExceptionSink.h:48
defines a Qore-language class
Definition: QoreClass.h:249
contains constants, classes, and subnamespaces in QoreProgram objects
Definition: QoreNamespace.h:65
DLLEXPORT bool ROdereference() const
atomically decrements the reference count
unsigned qore_classid_t
used for the unique class ID for QoreClass objects
Definition: common.h:79