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/* inputthread.c -- The input thread implementation.
*
* Copyright 2007-2008 Tiago Vignatti <vignatti at freedesktop org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of the copyright holder(s)
* and author(s) shall not be used in advertising or otherwise to promote
* the sale, use or other dealings in this Software without prior written
* authorization from the copyright holder(s) and author(s).
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <errno.h>
#include <X11/Xpoll.h>
#include "inputstr.h"
#include "opaque.h"
typedef struct _ThreadDeviceFunc {
void (*f) (void *);
int fd;
void *closure;
} ThreadDeviceFunc;
ThreadDeviceFunc ThreadDevFunc[MAXDEVICES];
extern fd_set InputThreadFd;
extern int NumDevicesThreaded;
extern int InputThreadReadPipe;
extern int InputThreadWritePipe;
static pid_t tid_generation;
/*
* Create connections in the input thread. Must be called by the
* DDX implementation.
*/
void
AddEnabledDeviceThreaded(int fd, void (*f)(void *), void *closure)
{
FD_SET(fd, &InputThreadFd);
ThreadDevFunc[NumDevicesThreaded].fd = fd;
ThreadDevFunc[NumDevicesThreaded].f = f;
ThreadDevFunc[NumDevicesThreaded].closure = closure;
NumDevicesThreaded++;
DebugF("Input thread: Using PTHREAD for input device %d\n", fd);
}
/**
* The workhorse of threaded input event generation.
*
* Runs in parallel with the server main thread, listening to input devices in
* an endless loop. Whenever new input data is made available, calls the proper
* device driver's routines which are ultimately responsible for the generation
* of input events as known by X.
*
* @see _DeviceEvent
* @see _RawDeviceEvent
* @see _InternalEvent
*/
static void*
WaitForInput(void* argument)
{
int i;
fd_set ReadyInputDevices;
tid_generation = syscall(__NR_gettid);
FD_ZERO(&ReadyInputDevices);
while (1)
{
XFD_COPYSET(&InputThreadFd, &ReadyInputDevices);
DebugF("inputthread: WaitForInput() blocking in Select()\n");
i = Select(MaxInputDevices, &ReadyInputDevices, NULL, NULL, NULL);
DebugF("inputthread: WaitForInput() awakening from Select()\n");
if (i < 0) /* An error occurred */
{
if (errno == EINVAL)
{
FatalError("WaitForInput(): select: %s\n",
strerror(errno));
}
else if (errno != EINTR && errno != EAGAIN)
{
ErrorF("WaitForInput(): select: %s\n",
strerror(errno));
}
}
/* Call the device drivers to generate input events for us */
for (i = 0; i < NumDevicesThreaded; i++)
if ((FD_ISSET(ThreadDevFunc[i].fd, &ReadyInputDevices))
&& ThreadDevFunc[i].f)
(*ThreadDevFunc[i].f)(ThreadDevFunc[i].closure);
/* Kick main thread to process the generated input events */
DebugF("inputthread: WaitforInput() notifying main thread\n");
PipeWrite(InputThreadWritePipe);
}
}
/*
* Called by the dix to create the input thread.
*/
void
CreateInputThread (void)
{
pthread_t input_thread;
pthread_attr_t attr;
pthread_attr_init(&attr);
/* In OSes that differentiate processes and threads this bellow may have
* some sense. Linux uses 1:1 thread model. The scheduler handles every
* thread as a normal process. Therefore this probably have no meaning
* if you are under Linux.
*/
if (pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) != 0)
perror("error setting input thread scope");
if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN) != 0)
perror("error setting input thread stack size");
pthread_create(&input_thread, &attr, &WaitForInput, NULL);
pthread_attr_destroy (&attr);
}
/*
* Called by the dix to close the input thread cleanly.
*/
void
CloseInputThread (void)
{
RemoveEnabledDevice(InputThreadReadPipe);
FD_ZERO(&InputThreadFd);
NumDevicesThreaded = 0;
syscall(__NR_tkill, tid_generation);
}
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