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/* $XConsortium: iopreader.c,v 1.2 94/04/12 17:24:33 dpw Exp $ */
/* Copyright (c) 1987 by the Regents of the University of California
* Copyright (c) 1994 by the Vrije Universiteit, Amsterdam.
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies. The University of California
* and the Vrije Universiteit make no representations about
* the suitability of this software for any purpose.
* It is provided "as is" without express or implied warranty.
*/
#ifdef AMOEBA
/*
* iopreader.c
*
*/
#define port am_port_t
#include <amoeba.h>
#include <ampolicy.h>
#include <cmdreg.h>
#include <stdcom.h>
#include <stderr.h>
#include <server/iop/iop.h>
#undef port
#include "osdep.h"
#define DEVREADER_STACK 8000
#define MAXEVENTQUEUE 32
capability iopcap;
static mutex lock;
static semaphore empty, filled;
static IOPEvent event_queue[MAXEVENTQUEUE];
static int event_qin, event_qout;
void IOPCleanUp();
static void IOPServerReader();
/*
* Initialize the IOP server
*/
void
InitializeIOPServerReader()
{
capability hostcap;
errstat err;
/*
* Initialize event queue
*/
event_qin = event_qout = 0;
sema_init(&empty, MAXEVENTQUEUE);
sema_init(&filled, 0);
mu_init(&lock);
/*
* Get IOP capability, and enable the server
*/
if (XServerHostName == NULL)
FatalError("No hostname, no screen\n");
if ((err = host_lookup(XServerHostName, &hostcap)) != STD_OK ||
(err = dir_lookup(&hostcap, DEF_IOPSVRNAME, &iopcap)) != STD_OK)
{
FatalError("Cannot find IOP server for %s: %s\n",
XServerHostName, err_why(err));
}
/*
* Enable IOP server
*/
if ((err = iop_enable(&iopcap)) != STD_OK)
FatalError("iop_enable failed (%s)\n", err_why(err));
/*
* Start IOP reader thread
*/
atexit(IOPCleanUp);
if (thread_newthread(IOPServerReader, DEVREADER_STACK, 0, 0) <= 0)
FatalError("Cannot start IOP reader thread\n");
}
/*
* IOP clean up, actuall disable the IOP server. Its the IOP's own choice
* what do do (perhaps restore the screen?).
*/
void
IOPCleanUp()
{
errstat err;
if ((err = iop_disable(&iopcap)) != STD_OK)
ErrorF("iop_disable failed (%s)\n", err_why(err));
}
/*
* This threads polls the IOP server for events. Once an event (or a
* number of events) are read, they are queued up using a traditional
* producer/consumer approach.
*/
static void
IOPServerReader()
{
IOPEvent queue[MAXEVENTQUEUE-1];
int nevents, i;
errstat err;
WaitForInitialization();
#ifdef XDEBUG
if (amDebug) ErrorF("IOPServerReader() running ...\n");
#endif
for (;;) {
do {
nevents = MAXEVENTQUEUE - 1;
err = iop_getevents(&iopcap, queue, &nevents);
if (err != STD_OK) {
if (err != RPC_FAILURE) {
ErrorF("iop_getevents failed (%s)\n", err_why(err));
}
nevents = 0;
}
} while (nevents <= 0);
/* store event(s) in the global event queue */
sema_mdown(&empty, nevents);
mu_lock(&lock);
for (i = 0; i < nevents; i++) {
event_queue[event_qin] = queue[i];
event_qin = (event_qin + 1) % MAXEVENTQUEUE;
}
mu_unlock(&lock);
sema_mup(&filled, nevents);
WakeUpMainThread();
}
}
/*
* Return the number of IOP events waiting
*/
int
AmoebaEventsAvailable()
{
return sema_level(&filled);
}
/*
* Get the IOP events from the queue. ``size'' is the maximum the
* requestor cares to handle, the actual size read is returned as
* result.
*/
int
AmoebaGetEvents(queue, size)
IOPEvent *queue;
int size;
{
int nevents, i;
if (sema_level(&filled) <= 0) return 0;
if ((nevents = sema_level(&filled)) > size)
nevents = size;
sema_mdown(&filled, nevents);
mu_lock(&lock);
for (i = 0; i < nevents; i++) {
queue[i] = event_queue[event_qout];
event_qout = (event_qout + 1) % MAXEVENTQUEUE;
}
mu_unlock(&lock);
sema_mup(&empty, nevents);
return nevents;
}
#endif /* AMOEBA */
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