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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2009-2013. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
#ifdef __WIN32__
#include <windows.h>
#else
#include <sys/select.h>
#endif
#include <errno.h>
#include <stdio.h>
#include "erl_driver.h"
#define get_int32(s) ((((unsigned char*) (s))[0] << 24) | \
(((unsigned char*) (s))[1] << 16) | \
(((unsigned char*) (s))[2] << 8) | \
(((unsigned char*) (s))[3]))
#define ERTS_TEST_SCHEDULING_DRV_NAME "scheduling_drv"
#define ERTS_TEST_SCHEDULING_DRV_FLAGS \
ERL_DRV_FLAG_USE_PORT_LOCKING | ERL_DRV_FLAG_SOFT_BUSY
ErlDrvData start(ErlDrvPort port, char *command);
void output(ErlDrvData drv_data, char *buf, ErlDrvSizeT len);
ErlDrvSSizeT control(ErlDrvData drv_data, unsigned int command, char *buf,
ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen);
void stop(ErlDrvData drv_data);
void timeout(ErlDrvData drv_data);
static void delay(unsigned ms);
static ErlDrvEntry busy_drv_entry = {
NULL /* init */,
start,
stop,
output,
NULL /* ready_input */,
NULL /* ready_output */,
ERTS_TEST_SCHEDULING_DRV_NAME,
NULL /* finish */,
NULL /* handle */,
control,
timeout,
NULL /* outputv */,
NULL /* ready_async */,
NULL /* flush */,
NULL /* call */,
NULL /* event */,
ERL_DRV_EXTENDED_MARKER,
ERL_DRV_EXTENDED_MAJOR_VERSION,
ERL_DRV_EXTENDED_MINOR_VERSION,
ERTS_TEST_SCHEDULING_DRV_FLAGS,
NULL /* handle2 */,
NULL /* handle_monitor */,
NULL /* stop_select */
};
#define DBG(data,FMT)
/* #define DBG(data,FMT) printf("0x%.8lx: %s",driver_caller(data->port),FMT); */
typedef struct SchedDrvData {
ErlDrvPort port;
char data[255];
int curr;
int use_auto_busy;
} SchedDrvData;
DRIVER_INIT(busy_drv)
{
return &busy_drv_entry;
}
ErlDrvData start(ErlDrvPort port, char *command)
{
SchedDrvData *d = driver_alloc(sizeof(SchedDrvData));
d->port = port;
d->curr = 0;
d->use_auto_busy = 0;
DBG(d,"start\r\n");
return (ErlDrvData) d;
}
void stop(ErlDrvData drv_data) {
SchedDrvData *d = (SchedDrvData*)drv_data;
driver_output(d->port,d->data,d->curr);
DBG(d,"close\r\n");
driver_free(d);
return;
}
void timeout(ErlDrvData drv_data) {
SchedDrvData *d = (SchedDrvData*)drv_data;
set_busy_port(d->port, 0);
DBG(d,"timeout\r\n");
}
void output(ErlDrvData drv_data, char *buf, ErlDrvSizeT len)
{
int res;
unsigned int command = *buf;
SchedDrvData *d = (SchedDrvData*)drv_data;
switch (command) {
case 'B': /* busy */
DBG(d,"busy: ");
set_busy_port(d->port, 1);
break;
case 'L': /* busy long call */
DBG(d,"long: ");
delay(buf[5]*100);
set_busy_port(d->port, 1);
break;
case 'D': /* delay call */
DBG(d,"delay: ");
delay(buf[5]*100);
break;
case 'N': /* not busy */
DBG(d,"not");
set_busy_port(d->port, 0);
goto done;
case 'C': /* change state */
DBG(d,"chang: ");
break;
case 'G': /* get state */
DBG(d,"get : ");
driver_output(d->port,d->data,d->curr);
return;
default:
driver_failure_posix((ErlDrvPort) drv_data, EINVAL);
break;
}
if (len > 1) {
unsigned int val = get_int32(buf+1);
fprintf(stderr,"%u",val);
d->data[d->curr++] = val;
}
done:
fprintf(stderr,"\r\n");
}
ErlDrvSSizeT control(ErlDrvData drv_data, unsigned int command, char *buf,
ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen)
{
switch (command) {
case 'B': /* busy */
set_busy_port((ErlDrvPort) drv_data, 1);
break;
case 'N': /* not busy */
set_busy_port((ErlDrvPort) drv_data, 0);
break;
default:
driver_failure_posix((ErlDrvPort) drv_data, EINVAL);
break;
}
return 0;
}
/*
* Delays (sleeps) the given number of milli-seconds.
*/
static void delay(unsigned ms)
{
fprintf(stderr,"delay(%u)",ms);
#ifdef __WIN32__
Sleep(ms);
#else
struct timeval t;
t.tv_sec = ms/1000;
t.tv_usec = (ms % 1000) * 1000;
select(0, NULL, NULL, NULL, &t);
#endif
}
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