source/io/poll.cpp

   1 #include <stdexcept>
   2 #include <msp/core/algorithm.h>
   3 #include "eventobject.h"
   4 #include "poll.h"
   5 #include "poll_platform.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace IO {
  11
  12 Poller::Poller():
  13         priv(new Private)
  14 { }
  15
  16 Poller::~Poller()
  17 {
  18         delete priv;
  19 }
  20
  21 void Poller::set_object(EventObject &obj, PollEvent ev)
  22 {
  23         // Verify that the object has an event handle
  24         if(ev)
  25                 obj.get_event_handle();
  26
  27         auto i = find_member(objects, &obj, &PolledObject::object);
  28         if(i!=objects.end())
  29         {
  30                 if(ev)
  31                         i->events = ev;
  32                 else
  33                 {
  34                         *i = objects.back();
  35                         objects.pop_back();
  36                         objs_changed = true;
  37                 }
  38                 events_changed = true;
  39                 return;
  40         }
  41
  42         if(!ev)
  43                 return;
  44
  45 #ifdef _WIN32
  46         if(objects.size()>=MAXIMUM_WAIT_OBJECTS)
  47                 throw logic_error("Maximum number of wait objects reached");
  48 #endif
  49
  50         objects.push_back(PolledObject(&obj, ev));
  51         objs_changed = true;
  52 }
  53
  54 unsigned Poller::poll()
  55 {
  56         return do_poll(-1);
  57 }
  58
  59 unsigned Poller::poll(const Time::TimeDelta &timeout)
  60 {
  61         if(timeout<Time::zero)
  62                 throw invalid_argument("Poller::poll");
  63
  64         return do_poll(static_cast<int>(timeout/Time::msec));
  65 }
  66
  67 unsigned Poller::do_poll(int timeout)
  68 {
  69         if(objs_changed || events_changed)
  70         {
  71                 rebuild_array();
  72                 events_changed = false;
  73                 objs_changed = false;
  74         }
  75
  76         poll_result.clear();
  77
  78         platform_poll(timeout);
  79
  80         return poll_result.size();
  81 }
  82
  83
  84 PollEvent platform_poll(EventObject &, PollEvent, int);
  85
  86 PollEvent poll(EventObject &obj, PollEvent pe)
  87 {
  88         return platform_poll(obj, pe, -1);
  89 }
  90
  91 PollEvent poll(EventObject &obj, PollEvent pe, const Time::TimeDelta &timeout)
  92 {
  93         if(timeout<Time::zero)
  94                 throw invalid_argument("poll");
  95
  96         return platform_poll(obj, pe, static_cast<int>(timeout/Time::msec));
  97 }
  98
  99 } // namespace IO
 100 } // namespace Msp