Mercurial > octave
annotate libinterp/corefcn/event-queue.h @ 17744:d63878346099
maint: Update copyright notices for release.
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Wed, 23 Oct 2013 22:09:27 -0400 |
| parents | 68fc671a9339 |
| children | 175b392e91fe |
| rev | line source |
|---|---|
| 15396 | 1 /* |
| 2 | |
|
17744
d63878346099
maint: Update copyright notices for release.
John W. Eaton <jwe@octave.org>
parents:
16892
diff
changeset
|
3 Copyright (C) 2012-2013 John W. Eaton |
| 15396 | 4 |
| 5 This file is part of Octave. | |
| 6 | |
| 7 Octave is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 3 of the License, or (at your | |
| 10 option) any later version. | |
| 11 | |
| 12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with Octave; see the file COPYING. If not, see | |
| 19 <http://www.gnu.org/licenses/>. | |
| 20 | |
| 21 */ | |
| 22 | |
| 23 #if !defined (octave_event_queue_h) | |
| 24 #define octave_event_queue_h 1 | |
| 25 | |
| 26 #include <queue> | |
| 27 #include <memory> | |
| 28 | |
| 29 #include "action-container.h" | |
| 30 | |
| 31 class | |
| 32 event_queue : public action_container | |
| 33 { | |
| 34 public: | |
| 35 | |
| 36 event_queue (void) : fifo () { } | |
| 37 | |
| 38 // Destructor should not raise an exception, so all actions | |
| 39 // registered should be exception-safe (but setting error_state is | |
| 40 // allowed). If you're not sure, see event_queue_safe. | |
| 41 | |
| 42 ~event_queue (void) { run (); } | |
| 43 | |
| 44 void add (elem *new_elem) | |
| 45 { | |
| 46 fifo.push (new_elem); | |
| 47 } | |
| 48 | |
| 49 void run_first (void) | |
| 50 { | |
| 51 if (! empty ()) | |
| 52 { | |
| 53 // No leak on exception! | |
| 54 std::auto_ptr<elem> ptr (fifo.front ()); | |
| 55 fifo.pop (); | |
| 56 ptr->run (); | |
| 57 } | |
| 58 } | |
| 59 | |
| 60 void discard_first (void) | |
| 61 { | |
| 62 if (! empty ()) | |
| 63 { | |
| 64 elem *ptr = fifo.front (); | |
| 65 fifo.pop (); | |
| 66 delete ptr; | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 size_t size (void) const { return fifo.size (); } | |
| 71 | |
| 72 protected: | |
| 73 | |
| 74 std::queue<elem *> fifo; | |
| 75 | |
| 76 private: | |
| 77 | |
| 78 // No copying! | |
| 79 | |
| 80 event_queue (const event_queue&); | |
| 81 | |
| 82 event_queue& operator = (const event_queue&); | |
| 83 }; | |
| 84 | |
| 85 // Like event_queue, but this one will guard against the | |
| 86 // possibility of seeing an exception (or interrupt) in the cleanup | |
| 87 // actions. Not that we can do much about it, but at least we won't | |
| 88 // crash. | |
| 89 | |
| 90 class | |
| 91 event_queue_safe : public event_queue | |
| 92 { | |
| 93 private: | |
| 94 | |
| 95 static void gripe_exception (void); | |
| 96 | |
| 97 public: | |
| 98 | |
| 99 event_queue_safe (void) : event_queue () { } | |
| 100 | |
| 101 ~event_queue_safe (void) | |
| 102 { | |
| 103 while (! empty ()) | |
| 104 { | |
| 105 try | |
| 106 { | |
| 107 run_first (); | |
| 108 } | |
| 109 catch (...) // Yes, the black hole. Remember we're in a dtor. | |
| 110 { | |
| 111 gripe_exception (); | |
| 112 } | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 private: | |
| 117 | |
| 118 // No copying! | |
| 119 | |
| 120 event_queue_safe (const event_queue_safe&); | |
| 121 | |
| 122 event_queue_safe& operator = (const event_queue_safe&); | |
| 123 }; | |
| 124 | |
| 125 #endif |