libtorrent/src/alert.cpp

   1 /*
   2
   3 Copyright (c) 2003, Arvid Norberg, Daniel Wallin
   4 All rights reserved.
   5
   6 Redistribution and use in source and binary forms, with or without
   7 modification, are permitted provided that the following conditions
   8 are met:
   9
  10     * Redistributions of source code must retain the above copyright
  11       notice, this list of conditions and the following disclaimer.
  12     * Redistributions in binary form must reproduce the above copyright
  13       notice, this list of conditions and the following disclaimer in
  14       the documentation and/or other materials provided with the distribution.
  15     * Neither the name of the author nor the names of its
  16       contributors may be used to endorse or promote products derived
  17       from this software without specific prior written permission.
  18
  19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  23 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29 POSSIBILITY OF SUCH DAMAGE.
  30
  31 */
  32
  33 #include "libtorrent/pch.hpp"
  34
  35 #include "libtorrent/alert.hpp"
  36 #include <boost/thread/xtime.hpp>
  37
  38 namespace libtorrent {
  39
  40         alert::alert() : m_timestamp(time_now()) {}
  41         alert::~alert() {}
  42         ptime alert::timestamp() const { return m_timestamp; }
  43
  44         alert_manager::alert_manager()
  45                 : m_alert_mask(alert::error_notification)
  46                 , m_queue_size_limit(queue_size_limit_default)
  47         {}
  48
  49         alert_manager::~alert_manager()
  50         {
  51                 while (!m_alerts.empty())
  52                 {
  53                         delete m_alerts.front();
  54                         m_alerts.pop();
  55                 }
  56         }
  57
  58         alert const* alert_manager::wait_for_alert(time_duration max_wait)
  59         {
  60                 boost::mutex::scoped_lock lock(m_mutex);
  61
  62                 if (!m_alerts.empty()) return m_alerts.front();
  63
  64                 int secs = total_seconds(max_wait);
  65                 max_wait -= seconds(secs);
  66                 boost::xtime xt;
  67                 boost::xtime_get(&xt, boost::TIME_UTC);
  68                 xt.sec += secs;
  69                 boost::int64_t nsec = xt.nsec + total_microseconds(max_wait) * 1000;
  70                 if (nsec > 1000000000)
  71                 {
  72                         nsec -= 1000000000;
  73                         xt.sec += 1;
  74                 }
  75                 xt.nsec = boost::xtime::xtime_nsec_t(nsec);
  76                 // apparently this call can be interrupted
  77                 // prematurely if there are other signals
  78                 if (!m_condition.timed_wait(lock, xt)) return 0;
  79                 if (m_alerts.empty()) return 0;
  80                 return m_alerts.front();
  81         }
  82
  83         void alert_manager::post_alert(const alert& alert_)
  84         {
  85                 boost::mutex::scoped_lock lock(m_mutex);
  86
  87                 if (m_alerts.size() >= m_queue_size_limit) return;
  88                 m_alerts.push(alert_.clone().release());
  89                 m_condition.notify_all();
  90         }
  91
  92         std::auto_ptr<alert> alert_manager::get()
  93         {
  94                 boost::mutex::scoped_lock lock(m_mutex);
  95
  96                 TORRENT_ASSERT(!m_alerts.empty());
  97
  98                 alert* result = m_alerts.front();
  99                 m_alerts.pop();
 100                 return std::auto_ptr<alert>(result);
 101         }
 102
 103         bool alert_manager::pending() const
 104         {
 105                 boost::mutex::scoped_lock lock(m_mutex);
 106
 107                 return !m_alerts.empty();
 108         }
 109
 110         size_t alert_manager::set_alert_queue_size_limit(size_t queue_size_limit_)
 111         {
 112                 boost::mutex::scoped_lock lock(m_mutex);
 113
 114                 std::swap(m_queue_size_limit, queue_size_limit_);
 115                 return queue_size_limit_;
 116         }
 117
 118 } // namespace libtorrent
 119