288 lines
7.1 KiB
C++
288 lines
7.1 KiB
C++
/*
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* synergy -- mouse and keyboard sharing utility
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* Copyright (C) 2004 Chris Schoeneman, Nick Bolton, Sorin Sbarnea
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*
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* This package is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* found in the file COPYING that should have accompanied this file.
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*
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* This package is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "CXWindowsEventQueueBuffer.h"
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#include "CLock.h"
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#include "CThread.h"
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#include "CEvent.h"
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#include "IEventQueue.h"
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#include <fcntl.h>
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#if HAVE_POLL
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# include <poll.h>
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#else
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# if HAVE_SYS_SELECT_H
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# include <sys/select.h>
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# endif
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# if HAVE_SYS_TIME_H
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# include <sys/time.h>
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# endif
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# if HAVE_SYS_TYPES_H
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# include <sys/types.h>
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# endif
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#endif
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//
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// CEventQueueTimer
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//
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class CEventQueueTimer { };
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//
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// CXWindowsEventQueueBuffer
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//
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CXWindowsEventQueueBuffer::CXWindowsEventQueueBuffer(
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Display* display, Window window) :
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m_display(display),
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m_window(window),
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m_waiting(false)
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{
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assert(m_display != NULL);
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assert(m_window != None);
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m_userEvent = XInternAtom(m_display, "SYNERGY_USER_EVENT", False);
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// set up for pipe hack
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int result = pipe(m_pipefd);
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assert(result == 0);
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int pipeflags;
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pipeflags = fcntl(m_pipefd[0], F_GETFL);
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fcntl(m_pipefd[0], F_SETFL, pipeflags | O_NONBLOCK);
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pipeflags = fcntl(m_pipefd[1], F_GETFL);
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fcntl(m_pipefd[1], F_SETFL, pipeflags | O_NONBLOCK);
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}
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CXWindowsEventQueueBuffer::~CXWindowsEventQueueBuffer()
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{
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// release pipe hack resources
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close(m_pipefd[0]);
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close(m_pipefd[1]);
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}
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void
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CXWindowsEventQueueBuffer::waitForEvent(double dtimeout)
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{
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CThread::testCancel();
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// clear out the pipe in preparation for waiting.
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char buf[16];
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ssize_t read_response = read(m_pipefd[0], buf, 15);
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// with linux automake, warnings are treated as errors by default
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if (read_response < 0)
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{
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// todo: handle read response
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}
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{
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CLock lock(&m_mutex);
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// we're now waiting for events
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m_waiting = true;
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// push out pending events
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flush();
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}
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// calling flush may have queued up a new event.
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if (!CXWindowsEventQueueBuffer::isEmpty()) {
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CThread::testCancel();
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return;
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}
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// use poll() to wait for a message from the X server or for timeout.
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// this is a good deal more efficient than polling and sleeping.
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#if HAVE_POLL
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struct pollfd pfds[2];
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pfds[0].fd = ConnectionNumber(m_display);
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pfds[0].events = POLLIN;
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pfds[1].fd = m_pipefd[0];
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pfds[1].events = POLLIN;
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int timeout = (dtimeout < 0.0) ? -1 :
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static_cast<int>(1000.0 * dtimeout);
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int remaining = timeout;
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int retval = 0;
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#else
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struct timeval timeout;
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struct timeval* timeoutPtr;
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if (dtimeout < 0.0) {
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timeoutPtr = NULL;
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}
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else {
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timeout.tv_sec = static_cast<int>(dtimeout);
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timeout.tv_usec = static_cast<int>(1.0e+6 *
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(dtimeout - timeout.tv_sec));
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timeoutPtr = &timeout;
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}
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// initialize file descriptor sets
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fd_set rfds;
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FD_ZERO(&rfds);
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FD_SET(ConnectionNumber(m_display), &rfds);
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FD_SET(m_pipefd[0], &rfds);
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int nfds;
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if (ConnectionNumber(m_display) > m_pipefd[0]) {
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nfds = ConnectionNumber(m_display) + 1;
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}
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else {
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nfds = m_pipefd[0] + 1;
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}
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#endif
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// It's possible that the X server has queued events locally
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// in xlib's event buffer and not pushed on to the fd. Hence we
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// can't simply monitor the fd as we may never be woken up.
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// ie addEvent calls flush, XFlush may not send via the fd hence
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// there is an event waiting to be sent but we must exit the poll
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// before it can.
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// Instead we poll for a brief period of time (so if events
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// queued locally in the xlib buffer can be processed)
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// and continue doing this until timeout is reached.
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// The human eye can notice 60hz (ansi) which is 16ms, however
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// we want to give the cpu a chance s owe up this to 25ms
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#define TIMEOUT_DELAY 25
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while( ((dtimeout < 0.0) || (remaining > 0)) && QLength(m_display)==0 && retval==0){
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#if HAVE_POLL
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retval = poll(pfds, 2, TIMEOUT_DELAY); //16ms = 60hz, but we make it > to play nicely with the cpu
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if (pfds[1].revents & POLLIN) {
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ssize_t read_response = read(m_pipefd[0], buf, 15);
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// with linux automake, warnings are treated as errors by default
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if (read_response < 0)
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{
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// todo: handle read response
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}
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}
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#else
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retval = select(nfds,
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SELECT_TYPE_ARG234 &rfds,
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SELECT_TYPE_ARG234 NULL,
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SELECT_TYPE_ARG234 NULL,
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SELECT_TYPE_ARG5 TIMEOUT_DELAY);
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if (FD_SET(m_pipefd[0], &rfds) {
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read(m_pipefd[0], buf, 15);
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}
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#endif
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remaining-=TIMEOUT_DELAY;
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}
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{
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// we're no longer waiting for events
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CLock lock(&m_mutex);
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m_waiting = false;
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}
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CThread::testCancel();
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}
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IEventQueueBuffer::Type
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CXWindowsEventQueueBuffer::getEvent(CEvent& event, UInt32& dataID)
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{
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CLock lock(&m_mutex);
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// push out pending events
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flush();
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// get next event
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XNextEvent(m_display, &m_event);
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// process event
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if (m_event.xany.type == ClientMessage &&
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m_event.xclient.message_type == m_userEvent) {
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dataID = static_cast<UInt32>(m_event.xclient.data.l[0]);
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return kUser;
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}
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else {
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event = CEvent(CEvent::kSystem,
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IEventQueue::getSystemTarget(), &m_event);
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return kSystem;
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}
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}
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bool
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CXWindowsEventQueueBuffer::addEvent(UInt32 dataID)
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{
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// prepare a message
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XEvent xevent;
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xevent.xclient.type = ClientMessage;
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xevent.xclient.window = m_window;
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xevent.xclient.message_type = m_userEvent;
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xevent.xclient.format = 32;
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xevent.xclient.data.l[0] = static_cast<long>(dataID);
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// save the message
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CLock lock(&m_mutex);
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m_postedEvents.push_back(xevent);
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// if we're currently waiting for an event then send saved events to
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// the X server now. if we're not waiting then some other thread
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// might be using the display connection so we can't safely use it
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// too.
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if (m_waiting) {
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flush();
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// Send a character through the round-trip pipe to wake a thread
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// that is waiting for a ConnectionNumber() socket to be readable.
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// The flush call can read incoming data from the socket and put
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// it in Xlib's input buffer. That sneaks it past the other thread.
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ssize_t write_response = write(m_pipefd[1], "!", 1);
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// with linux automake, warnings are treated as errors by default
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if (write_response < 0)
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{
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// todo: handle read response
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}
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}
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return true;
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}
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bool
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CXWindowsEventQueueBuffer::isEmpty() const
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{
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CLock lock(&m_mutex);
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return (XPending(m_display) == 0 );
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}
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CEventQueueTimer*
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CXWindowsEventQueueBuffer::newTimer(double, bool) const
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{
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return new CEventQueueTimer;
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}
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void
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CXWindowsEventQueueBuffer::deleteTimer(CEventQueueTimer* timer) const
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{
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delete timer;
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}
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void
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CXWindowsEventQueueBuffer::flush()
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{
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// note -- m_mutex must be locked on entry
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// flush the posted event list to the X server
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for (size_t i = 0; i < m_postedEvents.size(); ++i) {
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XSendEvent(m_display, m_window, False, 0, &m_postedEvents[i]);
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}
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XFlush(m_display);
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m_postedEvents.clear();
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}
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