summaryrefslogtreecommitdiff
path: root/src/app_thread.cpp
blob: fbda33571b9c2bb0f893c15cbcf538f96a495c85 (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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/*
    Copyright (c) 2007-2009 FastMQ Inc.

    This file is part of 0MQ.

    0MQ is free software; you can redistribute it and/or modify it under
    the terms of the Lesser GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    0MQ 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
    Lesser GNU General Public License for more details.

    You should have received a copy of the Lesser GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <algorithm>

#include "../bindings/c/zmq.h"

#include "platform.hpp"

#if defined ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#if defined _MSC_VER
#include <intrin.h>
#endif
#else
#include <unistd.h>
#endif

#include "app_thread.hpp"
#include "dispatcher.hpp"
#include "fd_signaler.hpp"
#include "ypollset.hpp"
#include "err.hpp"
#include "pipe.hpp"
#include "config.hpp"
#include "socket_base.hpp"
#include "pub.hpp"
#include "sub.hpp"
#include "req.hpp"
#include "rep.hpp"
#include "p2p.hpp"

//  If the RDTSC is available we use it to prevent excessive
//  polling for commands. The nice thing here is that it will work on any
//  system with x86 architecture and gcc or MSVC compiler.
#if (defined __GNUC__ && (defined __i386__ || defined __x86_64__)) ||\
    (defined _MSC_VER && (defined _M_IX86 || defined _M_X64))
#define ZMQ_DELAY_COMMANDS
#endif

zmq::app_thread_t::app_thread_t (dispatcher_t *dispatcher_, int thread_slot_,
      int flags_) :
    object_t (dispatcher_, thread_slot_),
    associated (false),
    last_processing_time (0)
{
    if (flags_ & ZMQ_POLL) {
        signaler = new fd_signaler_t;
        zmq_assert (signaler);
    }
    else {
        signaler = new ypollset_t;
        zmq_assert (signaler);
    }
}

zmq::app_thread_t::~app_thread_t ()
{
    zmq_assert (sockets.empty ());
    zmq_assert (signaler);
    delete signaler;
}

zmq::i_signaler *zmq::app_thread_t::get_signaler ()
{
    return signaler;
}

bool zmq::app_thread_t::is_current ()
{
    return !sockets.empty () && associated &&
        thread_t::equal (tid, thread_t::id ());
}

bool zmq::app_thread_t::make_current ()
{
    //  If there are object managed by this slot we cannot assign the slot
    //  to a different thread.
    if (!sockets.empty ())
        return false;

    associated = true;
    tid = thread_t::id ();
    return true;
}

void zmq::app_thread_t::process_commands (bool block_, bool throttle_)
{
    uint64_t signals;
    if (block_)
        signals = signaler->poll ();
    else {

#if defined ZMQ_DELAY_COMMANDS
        //  Optimised version of command processing - it doesn't have to check
        //  for incoming commands each time. It does so only if certain time
        //  elapsed since last command processing. Command delay varies
        //  depending on CPU speed: It's ~1ms on 3GHz CPU, ~2ms on 1.5GHz CPU
        //  etc. The optimisation makes sense only on platforms where getting
        //  a timestamp is a very cheap operation (tens of nanoseconds).
        if (throttle_) {

            //  Get timestamp counter.
#if defined __GNUC__
            uint32_t low;
            uint32_t high;
            __asm__ volatile ("rdtsc" : "=a" (low), "=d" (high));
            uint64_t current_time = (uint64_t) high << 32 | low;
#elif defined _MSC_VER
            uint64_t current_time = __rdtsc ();
#else
#error
#endif

            //  Check whether certain time have elapsed since last command
            //  processing.
            if (current_time - last_processing_time <= max_command_delay)
                return;
            last_processing_time = current_time;
        }
#endif

        //  Check whether there are any commands pending for this thread.
        signals = signaler->check ();
    }

    if (signals) {

        //  Traverse all the possible sources of commands and process
        //  all the commands from all of them.
        for (int i = 0; i != thread_slot_count (); i++) {
            if (signals & (uint64_t (1) << i)) {
                command_t cmd;
                while (dispatcher->read (i, get_thread_slot (), &cmd))
                    cmd.destination->process_command (cmd);
            }
        }
    }
}

zmq::socket_base_t *zmq::app_thread_t::create_socket (int type_)
{
    socket_base_t *s = NULL;
    switch (type_) {
    case ZMQ_PUB:
        s = new pub_t (this);
        break;
    case ZMQ_SUB:
        s = new sub_t (this);
        break;
    case ZMQ_REQ:
        s = new req_t (this);
        break;
    case ZMQ_REP:
        s = new rep_t (this);
        break;
    case ZMQ_P2P:
        s = new p2p_t (this);
        break;
    default:
        //  TODO: This should be EINVAL.
        zmq_assert (false);
    }
    zmq_assert (s);

    sockets.push_back (s);

    return s;
}

void zmq::app_thread_t::remove_socket (socket_base_t *socket_)
{
    sockets.erase (socket_);
}