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///////////////////////////////////////////////////////////////////////////////
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// Name: src/unix/epolldispatcher.cpp
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// Purpose: implements dispatcher for epoll_wait() call
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// Author: Lukasz Michalski
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// RCS-ID: $Id: epolldispatcher.cpp 67254 2011-03-20 00:14:35Z DS $
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// Copyright: (c) 2007 Lukasz Michalski
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// ============================================================================
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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// for compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#if wxUSE_EPOLL_DISPATCHER
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#include "wx/unix/private/epolldispatcher.h"
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#include "wx/unix/private.h"
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#include "wx/stopwatch.h"
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#include <sys/epoll.h>
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#define wxEpollDispatcher_Trace wxT("epolldispatcher")
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// ============================================================================
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// ============================================================================
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// helper: return EPOLLxxx mask corresponding to the given flags (and also log
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// debugging messages about it)
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static uint32_t GetEpollMask(int flags, int fd)
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wxUnusedVar(fd); // unused if wxLogTrace() disabled
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if ( flags & wxFDIO_INPUT )
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wxLogTrace(wxEpollDispatcher_Trace,
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wxT("Registered fd %d for input events"), fd);
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if ( flags & wxFDIO_OUTPUT )
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wxLogTrace(wxEpollDispatcher_Trace,
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wxT("Registered fd %d for output events"), fd);
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if ( flags & wxFDIO_EXCEPTION )
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ep |= EPOLLERR | EPOLLHUP;
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wxLogTrace(wxEpollDispatcher_Trace,
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wxT("Registered fd %d for exceptional events"), fd);
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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wxEpollDispatcher *wxEpollDispatcher::Create()
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int epollDescriptor = epoll_create(1024);
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if ( epollDescriptor == -1 )
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wxLogSysError(_("Failed to create epoll descriptor"));
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wxLogTrace(wxEpollDispatcher_Trace,
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wxT("Epoll fd %d created"), epollDescriptor);
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return new wxEpollDispatcher(epollDescriptor);
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wxEpollDispatcher::wxEpollDispatcher(int epollDescriptor)
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wxASSERT_MSG( epollDescriptor != -1, wxT("invalid descriptor") );
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m_epollDescriptor = epollDescriptor;
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wxEpollDispatcher::~wxEpollDispatcher()
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if ( close(m_epollDescriptor) != 0 )
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wxLogSysError(_("Error closing epoll descriptor"));
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bool wxEpollDispatcher::RegisterFD(int fd, wxFDIOHandler* handler, int flags)
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ev.events = GetEpollMask(flags, fd);
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ev.data.ptr = handler;
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const int ret = epoll_ctl(m_epollDescriptor, EPOLL_CTL_ADD, fd, &ev);
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wxLogSysError(_("Failed to add descriptor %d to epoll descriptor %d"),
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fd, m_epollDescriptor);
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wxLogTrace(wxEpollDispatcher_Trace,
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wxT("Added fd %d (handler %p) to epoll %d"), fd, handler, m_epollDescriptor);
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bool wxEpollDispatcher::ModifyFD(int fd, wxFDIOHandler* handler, int flags)
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ev.events = GetEpollMask(flags, fd);
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ev.data.ptr = handler;
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const int ret = epoll_ctl(m_epollDescriptor, EPOLL_CTL_MOD, fd, &ev);
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wxLogSysError(_("Failed to modify descriptor %d in epoll descriptor %d"),
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fd, m_epollDescriptor);
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wxLogTrace(wxEpollDispatcher_Trace,
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wxT("Modified fd %d (handler: %p) on epoll %d"), fd, handler, m_epollDescriptor);
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bool wxEpollDispatcher::UnregisterFD(int fd)
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if ( epoll_ctl(m_epollDescriptor, EPOLL_CTL_DEL, fd, &ev) != 0 )
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wxLogSysError(_("Failed to unregister descriptor %d from epoll descriptor %d"),
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fd, m_epollDescriptor);
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wxLogTrace(wxEpollDispatcher_Trace,
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wxT("removed fd %d from %d"), fd, m_epollDescriptor);
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wxEpollDispatcher::DoPoll(epoll_event *events, int numEvents, int timeout) const
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// the code below relies on TIMEOUT_INFINITE being -1 so that we can pass
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// timeout value directly to epoll_wait() which interprets -1 as meaning to
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// wait forever and would need to be changed if the value of
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// TIMEOUT_INFINITE ever changes
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wxCOMPILE_TIME_ASSERT( TIMEOUT_INFINITE == -1, UpdateThisCode );
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wxMilliClock_t timeEnd;
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timeEnd = wxGetLocalTimeMillis();
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rc = epoll_wait(m_epollDescriptor, events, numEvents, timeout);
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if ( rc != -1 || errno != EINTR )
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// we got interrupted, update the timeout and restart
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timeout = wxMilliClockToLong(timeEnd - wxGetLocalTimeMillis());
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bool wxEpollDispatcher::HasPending() const
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// NB: it's not really clear if epoll_wait() can return a number greater
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// than the number of events passed to it but just in case it can, use
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// >= instead of == here, see #10397
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return DoPoll(&event, 1, 0) >= 1;
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int wxEpollDispatcher::Dispatch(int timeout)
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epoll_event events[16];
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const int rc = DoPoll(events, WXSIZEOF(events), timeout);
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wxLogSysError(_("Waiting for IO on epoll descriptor %d failed"),
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for ( epoll_event *p = events; p < events + rc; p++ )
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wxFDIOHandler * const handler = (wxFDIOHandler *)(p->data.ptr);
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wxFAIL_MSG( wxT("NULL handler in epoll_event?") );
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// note that for compatibility with wxSelectDispatcher we call
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// OnReadWaiting() on EPOLLHUP as this is what epoll_wait() returns
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// when the write end of a pipe is closed while with select() the
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// remaining pipe end becomes ready for reading when this happens
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if ( p->events & (EPOLLIN | EPOLLHUP) )
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handler->OnReadWaiting();
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else if ( p->events & EPOLLOUT )
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handler->OnWriteWaiting();
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else if ( p->events & EPOLLERR )
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handler->OnExceptionWaiting();
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#endif // wxUSE_EPOLL_DISPATCHER