root/trunk/libffado/src/bounce/bounce_slave_avdevice.h

Revision 2691, 2.9 kB (checked in by jwoithe, 7 years ago)

Initial attempt to address deprecation of auto_ptr.

C++11 deprecates auto_ptr, and gcc6 (and later versions) print compile time
warnings to this effect whenever it is encountered in the source. The
replacement type is either shared_ptr or unique_ptr depending on the usage.
For almost all usages within FFADO it seems unique_ptr could be the
appropriate choice, but the symantics are a little different to auto_ptr.
Shared_ptr on the other hand can be a drop-in replacement, although it comes
with considerable overheads which unique_ptr avoids. In the context of the
current usage, the extra overhead incurred is not critical.

The code-base cannot at this time change unconditionally to shared_ptr and
unique_ptr because these are not available in gcc4 unless "--std=c++11" is
given. When gcc4 is used certain older versions of dependent libraries must
be used and these in turn will cause compile failures in their header files
if "--std=c++11" is used (libxml++ being an example). At present there are
sufficient users of FFADO still on gcc4 to justify maintaining compatibility
with that gcc version.

The approach adopted at present is to define ffado_smartptr to be either
auto_ptr (if c++11 is not in use) or shared_ptr if it is. All auto_ptr
instances are then changed to ffado_smartptr. This should allow FFADO to be
compiled without errors or warnings on systems using gcc4 and above. Gcc6
defaults to the c++14 standard, so ffado_smartptr will be shared_ptr in that
case; thus the warnings will be avoided.

In time, once gcc4 drops out of common use, the ffado_smartptr instances can
be progressively migrated to unique_ptr or shared_ptr as is appropriate. It
has been pointed out in the ffado-devel mailing list by Jano Svitok (2 May
2017, subject "smart pointers Was: [FFADO-devel] Liquid Saffire 56") that
bebob_dl_mgr.cpp could use unique_ptr. shared_ptr should be ok in other
auto_ptr sites, but futher analysis may show that at least some of them can
use unique_ptr.

The addressing of the auto_ptr issue was prompted by Xavier Forestier's
patch set submitted to ffado-devel in November 2016.

Line 
1 /*
2  * Copyright (C) 2005-2008 by Pieter Palmers
3  * Copyright (C) 2005-2008 by Daniel Wagner
4  *
5  * This file is part of FFADO
6  * FFADO = Free Firewire (pro-)audio drivers for linux
7  *
8  * FFADO is based upon FreeBoB
9  *
10  * This program is free software: you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation, either version 2 of the License, or
13  * (at your option) version 3 of the License.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
22  *
23  */
24
25 #ifndef __FFADO_BOUNCESLAVEDEVICE__
26 #define __FFADO_BOUNCESLAVEDEVICE__
27
28 #include "debugmodule/debugmodule.h"
29 #include "bounce_avdevice.h"
30
31 #define FFADO_MAX_NAME_LEN 256
32
33 #define FFADO_BOUNCE_SERVER_VENDORNAME  "FFADO Server"
34 #define FFADO_BOUNCE_SERVER_MODELNAME   "ffado-server"
35
36 // NOTE: this is currently free, but it is not really allowed to use
37 #define FFADO_BOUNCE_SERVER_VENDORID    0x000B0001
38 #define FFADO_BOUNCE_SERVER_MODELID     0x000B0001
39 #define FFADO_BOUNCE_SERVER_SPECID      0x000B0001
40
41 namespace Bounce {
42
43 class SlaveDevice : public Device {
44     class BounceSlaveNotifier;
45 public:
46
47     SlaveDevice( DeviceManager& d, ffado_smartptr<ConfigRom>( configRom ) );
48     virtual ~SlaveDevice();
49
50     static bool probe( Util::Configuration&, ConfigRom& configRom, bool generic = false );
51     static FFADODevice * createDevice( DeviceManager& d, ffado_smartptr<ConfigRom>( configRom ));
52
53     bool discover();
54     bool prepare();
55     bool lock();
56     bool unlock();
57
58     bool startStreamByIndex(int i);
59     bool stopStreamByIndex(int i);
60
61 private:
62     bool waitForRegisterNotEqualTo(nodeaddr_t offset, fb_quadlet_t v);
63     bool initMemSpace();
64     bool restoreMemSpace();
65
66 private: // configrom shit
67
68     struct configrom_backup {
69         quadlet_t rom[0x100];
70         size_t rom_size;
71         unsigned char rom_version;
72     };
73     struct configrom_backup m_original_config_rom;
74
75     struct configrom_backup
76         save_config_rom(raw1394handle_t handle);
77     int restore_config_rom(raw1394handle_t handle, struct configrom_backup old);
78     int init_config_rom(raw1394handle_t handle);
79
80 private:
81     BounceSlaveNotifier *m_Notifier;
82     /**
83      * this class reacts on the other side writing to the
84      * hosts address space
85      */
86     class BounceSlaveNotifier : public Ieee1394Service::ARMHandler
87     {
88     public:
89         BounceSlaveNotifier(SlaveDevice &, nodeaddr_t start);
90         virtual ~BounceSlaveNotifier();
91
92     private:
93         SlaveDevice &m_bounceslavedevice;
94     };
95 };
96
97 } // end of namespace Bounce
98
99 #endif /* __FFADO_BOUNCESLAVEDEVICE__ */
100
101
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