Jack2  1.9.12
JackLinuxFutex.h
1 /*
2 Copyright (C) 2004-2008 Grame
3 Copyright (C) 2016 Filipe Coelho
4 
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
9 
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
14 
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 
19 */
20 
21 #ifndef __JackLinuxFutex__
22 #define __JackLinuxFutex__
23 
24 #include "JackSynchro.h"
25 #include "JackCompilerDeps.h"
26 #include <stddef.h>
27 
28 namespace Jack
29 {
30 
41 class SERVER_EXPORT JackLinuxFutex : public detail::JackSynchro
42 {
43 
44  private:
45  struct FutexData {
46  int futex; // futex, needs to be 1st member
47  bool internal; // current internal state
48  bool wasInternal; // initial internal state, only changes in allocate
49  bool needsChange; // change state on next wait call
50  int externalCount; // how many external clients have connected
51  };
52 
53  int fSharedMem;
54  FutexData* fFutex;
55  bool fPrivate;
56  bool fPromiscuous;
57  int fPromiscuousGid;
58 
59  protected:
60 
61  void BuildName(const char* name, const char* server_name, char* res, int size);
62 
63  public:
64 
66 
67  bool Signal();
68  bool SignalAll();
69  bool Wait();
70  bool TimedWait(long usec);
71 
72  bool Allocate(const char* name, const char* server_name, int value, bool internal = false);
73  bool Connect(const char* name, const char* server_name);
74  bool ConnectInput(const char* name, const char* server_name);
75  bool ConnectOutput(const char* name, const char* server_name);
76  bool Disconnect();
77  void Destroy();
78 
79  void MakePrivate(bool priv);
80 };
81 
82 } // end of namespace
83 
84 
85 #endif
86