blob: 77bdebab00853b1927943f1449cf780d699f7d4a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
//
// Copyright 2013 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#ifndef INCLUDED_LIBUHD_USRP_COMMON_RECV_PACKET_DEMUXER_3000_HPP
#define INCLUDED_LIBUHD_USRP_COMMON_RECV_PACKET_DEMUXER_3000_HPP
#include <uhd/config.hpp>
#include <uhd/transport/zero_copy.hpp>
#include <boost/cstdint.hpp>
#include <boost/thread.hpp>
#include <uhd/utils/msg.hpp>
#include <uhd/utils/atomic.hpp>
#include <uhd/types/time_spec.hpp>
#include <uhd/utils/byteswap.hpp>
#include <queue>
#include <map>
namespace uhd{ namespace usrp{
struct recv_packet_demuxer_3000
{
recv_packet_demuxer_3000(transport::zero_copy_if::sptr xport):
_xport(xport)
{/*NOP*/}
transport::managed_recv_buffer::sptr get_recv_buff(const boost::uint32_t sid, const double timeout)
{
const time_spec_t exit_time = time_spec_t(timeout) + time_spec_t::get_system_time();
transport::managed_recv_buffer::sptr buff;
buff = _internal_get_recv_buff(sid, timeout);
while (not buff) //loop until timeout
{
const time_spec_t delta = exit_time - time_spec_t::get_system_time();
const double new_timeout = delta.get_real_secs();
if (new_timeout < 0.0) break;
buff = _internal_get_recv_buff(sid, new_timeout);
}
return buff;
}
transport::managed_recv_buffer::sptr _internal_get_recv_buff(const boost::uint32_t sid, const double timeout)
{
transport::managed_recv_buffer::sptr buff;
//----------------------------------------------------------
//-- Check the queue to see if we already have a buffer
//----------------------------------------------------------
{
boost::mutex::scoped_lock l(mutex);
queue_type_t &queue = _queues[sid];
if (not queue.empty())
{
buff = queue.front();
queue.front().reset();
queue.pop();
return buff;
}
}
// Following is disabled by default as super_recv_packet_handler (caller) is not thread safe
// Only underlying transport (libusb1_zero_copy) is thread safe
// The onus is on the caller to super_recv_packet_handler (and therefore this) to serialise access
#ifdef RECV_PACKET_DEMUXER_3000_THREAD_SAFE
//----------------------------------------------------------
//-- Try to claim the transport or wait patiently
//----------------------------------------------------------
if (_claimed.cas(1, 0))
{
boost::mutex::scoped_lock l(mutex);
cond.timed_wait(l, boost::posix_time::microseconds(long(timeout*1e6)));
}
//----------------------------------------------------------
//-- Wait on the transport for input buffers
//----------------------------------------------------------
else
#endif // RECV_PACKET_DEMUXER_3000_THREAD_SAFE
{
buff = _xport->get_recv_buff(timeout);
if (buff)
{
const boost::uint32_t new_sid = uhd::wtohx(buff->cast<const boost::uint32_t *>()[1]);
if (new_sid != sid)
{
boost::mutex::scoped_lock l(mutex);
if (_queues.count(new_sid) == 0) UHD_MSG(error)
<< "recv packet demuxer unexpected sid 0x" << std::hex << new_sid << std::dec
<< std::endl;
else _queues[new_sid].push(buff);
buff.reset();
}
}
#ifdef RECV_PACKET_DEMUXER_3000_THREAD_SAFE
_claimed.write(0);
cond.notify_all();
#endif // RECV_PACKET_DEMUXER_3000_THREAD_SAFE
}
return buff;
}
void realloc_sid(const boost::uint32_t sid)
{
boost::mutex::scoped_lock l(mutex);
while(not _queues[sid].empty()) //allocated and clears if already allocated
{
_queues[sid].pop();
}
}
typedef std::queue<transport::managed_recv_buffer::sptr> queue_type_t;
std::map<boost::uint32_t, queue_type_t> _queues;
transport::zero_copy_if::sptr _xport;
#ifdef RECV_PACKET_DEMUXER_3000_THREAD_SAFE
uhd::atomic_uint32_t _claimed;
boost::condition_variable cond;
#endif // RECV_PACKET_DEMUXER_3000_THREAD_SAFE
boost::mutex mutex;
};
}} //namespace uhd::usrp
#endif /* INCLUDED_LIBUHD_USRP_COMMON_RECV_PACKET_DEMUXER_3000_HPP */
|
