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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2012-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "erl_driver.h"
#define THR_MSG_BLAST_NO_PROCS 10
#define THR_MSG_BLAST_NO_SENDS_PER_PROC 10000
#define THR_MSG_BLAST_THREADS 32
static void stop(ErlDrvData drv_data);
static ErlDrvData start(ErlDrvPort port,
char *command);
static ErlDrvSSizeT control(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen);
static ErlDrvEntry thr_msg_blast_drv_entry = {
NULL /* init */,
start,
stop,
NULL /* output */,
NULL /* ready_input */,
NULL /* ready_output */,
"thr_msg_blast_drv",
NULL /* finish */,
NULL /* handle */,
control,
NULL /* 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,
ERL_DRV_FLAG_USE_PORT_LOCKING,
NULL /* handle2 */,
NULL /* handle_monitor */
};
typedef struct {
ErlDrvPort port;
ErlDrvTermData td_port;
ErlDrvTermData hi;
ErlDrvTid tid[THR_MSG_BLAST_THREADS];
int no_thrs;
ErlDrvTermData proc[THR_MSG_BLAST_NO_PROCS];
int no_procs;
} thr_msg_blast_data_t;
DRIVER_INIT(thr_msg_blast_drv)
{
return &thr_msg_blast_drv_entry;
}
static void stop(ErlDrvData drv_data)
{
int i;
thr_msg_blast_data_t *tmbd = (thr_msg_blast_data_t *) drv_data;
for (i = 0; i < tmbd->no_thrs; i++)
erl_drv_thread_join(tmbd->tid[i], NULL);
driver_free((void *) tmbd);
}
static ErlDrvData start(ErlDrvPort port,
char *command)
{
thr_msg_blast_data_t *tmbd;
tmbd = driver_alloc(sizeof(thr_msg_blast_data_t));
if (!tmbd)
return ERL_DRV_ERROR_GENERAL;
tmbd->port = port;
tmbd->td_port = driver_mk_port(port);
tmbd->hi = driver_mk_atom("hi");
tmbd->no_thrs = 0;
tmbd->no_procs = 1;
tmbd->proc[0] = driver_caller(port);
return (ErlDrvData) tmbd;
}
static void *thread(void *);
static ErlDrvSSizeT control(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen)
{
thr_msg_blast_data_t *tmbd = (thr_msg_blast_data_t *) drv_data;
char *res_str = "error";
if (tmbd->no_procs >= THR_MSG_BLAST_NO_PROCS) {
int i;
for (i = 0; i < tmbd->no_thrs; i++)
erl_drv_thread_join(tmbd->tid[i], NULL);
tmbd->no_thrs = 0;
res_str = "done";
}
else {
tmbd->proc[tmbd->no_procs++] = driver_caller(tmbd->port);
if (tmbd->no_procs == THR_MSG_BLAST_NO_PROCS) {
for (tmbd->no_thrs = 0;
tmbd->no_thrs < THR_MSG_BLAST_THREADS;
tmbd->no_thrs++) {
int res = erl_drv_thread_create("test",
&tmbd->tid[tmbd->no_thrs],
thread,
tmbd,
NULL);
if (res != 0) {
driver_failure_posix(tmbd->port, res);
goto done;
}
}
}
res_str = "receiver";
}
done: {
ErlDrvSSizeT res_len = strlen(res_str);
if (res_len > rlen) {
char *abuf = driver_alloc(sizeof(char)*res_len);
if (!abuf)
return 0;
*rbuf = abuf;
}
memcpy((void *) *rbuf, (void *) res_str, res_len);
return res_len;
}
}
static void *thread(void *varg)
{
int s, p;
thr_msg_blast_data_t *tmbd = (thr_msg_blast_data_t *) varg;
ErlDrvTermData spec[] = {
ERL_DRV_PORT, tmbd->td_port,
ERL_DRV_ATOM, tmbd->hi,
ERL_DRV_TUPLE, 2
};
for (s = 0; s < THR_MSG_BLAST_NO_SENDS_PER_PROC; s++) {
for (p = 0; p < THR_MSG_BLAST_NO_PROCS; p++) {
int res = erl_drv_send_term(tmbd->td_port, tmbd->proc[p],
spec, sizeof(spec)/sizeof(spec[0]));
if (p == 0 && res <= 0)
abort(); /* Could not send to creator */
}
}
return NULL;
}
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