// Purpose: implements dispatcher for select() call
// Author: Lukasz Michalski and Vadim Zeitlin
// Created: December 2006
-// RCS-ID: $Id$
// Copyright: (c) 2006 Lukasz Michalski
-// License: wxWindows licence
+// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
// ============================================================================
// for compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
+#ifdef __BORLANDC__
+ #pragma hdrstop
+#endif
+
+#if wxUSE_SELECT_DISPATCHER
+
#include "wx/private/selectdispatcher.h"
-#include "wx/module.h"
-#include "wx/timer.h"
#include "wx/unix/private.h"
#ifndef WX_PRECOMP
#include "wx/intl.h"
#endif
-#ifdef HAVE_SYS_SELECT_H
- #include <sys/select.h>
-#endif
-
#include <errno.h>
#define wxSelectDispatcher_Trace wxT("selectdispatcher")
{
for ( int n = 0; n < Max; n++ )
{
- if ( wxFD_ISSET(fd, &m_fds[n]) )
+ if ( wxFD_ISSET(fd, (fd_set*) &m_fds[n]) )
return true;
}
bool wxSelectSets::SetFD(int fd, int flags)
{
- wxCHECK_MSG( fd >= 0, false, _T("invalid descriptor") );
+ wxCHECK_MSG( fd >= 0, false, wxT("invalid descriptor") );
for ( int n = 0; n < Max; n++ )
{
if ( flags & ms_flags[n] )
{
wxFD_SET(fd, &m_fds[n]);
- wxLogTrace(wxSelectDispatcher_Trace,
- _T("Registered fd %d for %s events"), fd, ms_names[n]);
}
- else if ( wxFD_ISSET(fd, &m_fds[n]) )
+ else if ( wxFD_ISSET(fd, (fd_set*) &m_fds[n]) )
{
wxFD_CLR(fd, &m_fds[n]);
- wxLogTrace(wxSelectDispatcher_Trace,
- _T("Unregistered fd %d from %s events"), fd, ms_names[n]);
}
}
return select(nfds, &m_fds[Read], &m_fds[Write], &m_fds[Except], tv);
}
-void wxSelectSets::Handle(int fd, wxFDIOHandler& handler) const
+bool wxSelectSets::Handle(int fd, wxFDIOHandler& handler) const
{
for ( int n = 0; n < Max; n++ )
{
- if ( wxFD_ISSET(fd, &m_fds[n]) )
+ if ( wxFD_ISSET(fd, (fd_set*) &m_fds[n]) )
{
wxLogTrace(wxSelectDispatcher_Trace,
- _T("Got %s event on fd %d"), ms_names[n], fd);
+ wxT("Got %s event on fd %d"), ms_names[n], fd);
(handler.*ms_handlers[n])();
+ // callback can modify sets and destroy handler
+ // this forces that one event can be processed at one time
+ return true;
}
}
+
+ return false;
}
// ----------------------------------------------------------------------------
// wxSelectDispatcher
// ----------------------------------------------------------------------------
-static wxSelectDispatcher *gs_selectDispatcher = NULL;
-
-/* static */
-wxSelectDispatcher *wxSelectDispatcher::Get()
-{
- if ( !gs_selectDispatcher )
- {
- // the dispatcher should be only created from one thread so it should
- // be ok to use a global without any protection here
- gs_selectDispatcher = new wxSelectDispatcher;
- }
-
- return gs_selectDispatcher;
-}
-
-/* static */
-void wxSelectDispatcher::DispatchPending()
-{
- if ( gs_selectDispatcher )
- gs_selectDispatcher->RunLoop(0);
-}
-
-wxSelectDispatcher::wxSelectDispatcher()
-{
- m_maxFD = -1;
-}
-
bool wxSelectDispatcher::RegisterFD(int fd, wxFDIOHandler *handler, int flags)
{
- if ( !wxFDIODispatcher::RegisterFD(fd, handler, flags) )
+ if ( !wxMappedFDIODispatcher::RegisterFD(fd, handler, flags) )
return false;
if ( !m_sets.SetFD(fd, flags) )
if ( fd > m_maxFD )
m_maxFD = fd;
+ wxLogTrace(wxSelectDispatcher_Trace,
+ wxT("Registered fd %d: input:%d, output:%d, exceptional:%d"), fd, (flags & wxFDIO_INPUT) == wxFDIO_INPUT, (flags & wxFDIO_OUTPUT), (flags & wxFDIO_EXCEPTION) == wxFDIO_EXCEPTION);
return true;
}
bool wxSelectDispatcher::ModifyFD(int fd, wxFDIOHandler *handler, int flags)
{
- if ( !wxFDIODispatcher::ModifyFD(fd, handler, flags) )
+ if ( !wxMappedFDIODispatcher::ModifyFD(fd, handler, flags) )
return false;
- wxASSERT_MSG( fd <= m_maxFD, _T("logic error: registered fd > m_maxFD?") );
+ wxASSERT_MSG( fd <= m_maxFD, wxT("logic error: registered fd > m_maxFD?") );
+ wxLogTrace(wxSelectDispatcher_Trace,
+ wxT("Modified fd %d: input:%d, output:%d, exceptional:%d"), fd, (flags & wxFDIO_INPUT) == wxFDIO_INPUT, (flags & wxFDIO_OUTPUT) == wxFDIO_OUTPUT, (flags & wxFDIO_EXCEPTION) == wxFDIO_EXCEPTION);
return m_sets.SetFD(fd, flags);
}
-wxFDIOHandler *wxSelectDispatcher::UnregisterFD(int fd, int flags)
+bool wxSelectDispatcher::UnregisterFD(int fd)
{
- wxFDIOHandler * const handler = wxFDIODispatcher::UnregisterFD(fd, flags);
+ m_sets.ClearFD(fd);
- m_sets.ClearFD(fd, flags);
+ if ( !wxMappedFDIODispatcher::UnregisterFD(fd) )
+ return false;
// remove the handler if we don't need it any more
if ( !m_sets.HasFD(fd) )
++it )
{
if ( it->first > m_maxFD )
+ {
m_maxFD = it->first;
+ }
}
}
}
- return handler;
+ wxLogTrace(wxSelectDispatcher_Trace,
+ wxT("Removed fd %d, current max: %d"), fd, m_maxFD);
+ return true;
}
-void wxSelectDispatcher::ProcessSets(const wxSelectSets& sets)
+int wxSelectDispatcher::ProcessSets(const wxSelectSets& sets)
{
+ int numEvents = 0;
for ( int fd = 0; fd <= m_maxFD; fd++ )
{
if ( !sets.HasFD(fd) )
wxFDIOHandler * const handler = FindHandler(fd);
if ( !handler )
{
- wxFAIL_MSG( _T("NULL handler in wxSelectDispatcher?") );
+ wxFAIL_MSG( wxT("NULL handler in wxSelectDispatcher?") );
continue;
}
- sets.Handle(fd, *handler);
+ if ( sets.Handle(fd, *handler) )
+ numEvents++;
}
+
+ return numEvents;
}
-void wxSelectDispatcher::RunLoop(int timeout)
+int wxSelectDispatcher::DoSelect(wxSelectSets& sets, int timeout) const
{
struct timeval tv,
- *ptv = NULL;
+ *ptv;
if ( timeout != TIMEOUT_INFINITE )
{
ptv = &tv;
- tv.tv_sec = 0;
- tv.tv_usec = timeout*1000;
+ tv.tv_sec = timeout / 1000;
+ tv.tv_usec = (timeout % 1000)*1000;
}
-
- for ( ;; )
+ else // no timeout
{
- wxSelectSets sets = m_sets;
-
- wxStopWatch sw;
- if ( ptv && timeout )
- sw.Start(ptv->tv_usec/10);
-
- const int ret = sets.Select(m_maxFD + 1, ptv);
- switch ( ret )
- {
- case -1:
- // continue if we were interrupted by a signal, else bail out
- if ( errno != EINTR )
- {
- wxLogSysError(_("Failed to monitor I/O channels"));
- return;
- }
- break;
-
- case 0:
- // timeout expired without anything happening
- return;
+ ptv = NULL;
+ }
- default:
- ProcessSets(sets);
- }
+ int ret = sets.Select(m_maxFD + 1, ptv);
- if ( ptv )
- {
- timeout -= sw.Time();
- if ( timeout <= 0 )
- break;
+ // TODO: we need to restart select() in this case but for now just return
+ // as if timeout expired
+ if ( ret == -1 && errno == EINTR )
+ ret = 0;
- ptv->tv_usec = timeout*1000;
- }
- }
+ return ret;
}
-// ----------------------------------------------------------------------------
-// wxSelectDispatcherModule
-// ----------------------------------------------------------------------------
+bool wxSelectDispatcher::HasPending() const
+{
+ wxSelectSets sets(m_sets);
+ return DoSelect(sets, 0) > 0;
+}
-class wxSelectDispatcherModule : public wxModule
+int wxSelectDispatcher::Dispatch(int timeout)
{
-public:
- virtual bool OnInit() { return true; }
- virtual void OnExit() { wxDELETE(gs_selectDispatcher); }
+ wxSelectSets sets(m_sets);
+ switch ( DoSelect(sets, timeout) )
+ {
+ case -1:
+ wxLogSysError(_("Failed to monitor I/O channels"));
+ return -1;
-private:
- DECLARE_DYNAMIC_CLASS(wxSelectDispatcherModule)
-};
+ case 0:
+ // timeout expired without anything happening
+ return 0;
-IMPLEMENT_DYNAMIC_CLASS(wxSelectDispatcherModule, wxModule)
+ default:
+ return ProcessSets(sets);
+ }
+}
+#endif // wxUSE_SELECT_DISPATCHER
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