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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2011. 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%
*/
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include "erl_driver.h"
#define BLOCKS_PER_THREAD 100000
#define NO_THREADS 10
#define BLOCKS_PER_CTRL 1000
typedef struct {
ErlDrvMutex *mtx;
ErlDrvCond *cnd;
int b;
int *go;
int *skip;
void *blocks[BLOCKS_PER_THREAD];
} test_thread_data;
typedef struct {
ErlDrvPort port;
int b;
int go;
int skip;
test_thread_data ttd[NO_THREADS+1];
ErlDrvTid tids[NO_THREADS+1];
} test_data;
static ErlDrvData start(ErlDrvPort port, char *command);
static void stop(ErlDrvData data);
static int control(ErlDrvData drv_data, unsigned int command, char *buf,
int len, char **rbuf, int rlen);
static ErlDrvEntry thr_free_drv_entry = {
NULL /* init */,
start,
stop,
NULL /* output */,
NULL /* ready_input */,
NULL /* ready_output */,
"thr_free_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 */
};
DRIVER_INIT(thr_free_drv)
{
return &thr_free_drv_entry;
}
void *
test_thread(void *vttd)
{
test_thread_data *ttd = (test_thread_data *) vttd;
int i, skip;
erl_drv_mutex_lock(ttd->mtx);
while (!*ttd->go)
erl_drv_cond_wait(ttd->cnd, ttd->mtx);
skip = *ttd->skip;
erl_drv_mutex_unlock(ttd->mtx);
if (!skip) {
for (i = 0; i < BLOCKS_PER_THREAD; i++)
driver_free(ttd->blocks[i]);
}
return NULL;
}
ErlDrvData start(ErlDrvPort port, char *command)
{
int join = 0, t, b, res;
test_thread_data *ttd;
test_data *td = driver_alloc(sizeof(test_data));
if (!td)
return ERL_DRV_ERROR_GENERAL;
ttd = td->ttd;
for (b = 0; b < BLOCKS_PER_THREAD; b++)
for (t = 0; t <= NO_THREADS; t++)
ttd[t].blocks[b] = NULL;
ttd[0].mtx = NULL;
ttd[0].cnd = NULL;
for (b = 0; b < BLOCKS_PER_THREAD; b++) {
for (t = 0; t <= NO_THREADS; t++) {
ttd[t].blocks[b] = driver_alloc(1);
if (ttd[t].blocks[b] == NULL)
goto fail;
}
}
td->b = -1;
td->go = 0;
td->skip = 0;
ttd[0].mtx = erl_drv_mutex_create("test_mutex");
if (!ttd[0].mtx)
goto fail;
ttd[0].cnd = erl_drv_cond_create("test_cnd");
if (!ttd[0].cnd)
goto fail;
ttd[0].go = &td->go;
ttd[0].skip = &td->skip;
for (t = 1; t <= NO_THREADS; t++) {
ttd[t].mtx = ttd[0].mtx;
ttd[t].cnd = ttd[0].cnd;
ttd[t].go = ttd[0].go;
ttd[t].skip = ttd[0].skip;
res = erl_drv_thread_create("test_thread",
&td->tids[t],
test_thread,
&ttd[t],
NULL);
if (res != 0)
goto fail;
join = t;
}
td->port = port;
return (ErlDrvData) td;
fail:
if (join) {
erl_drv_mutex_lock(ttd[0].mtx);
td->go = 1;
td->skip = 1;
erl_drv_cond_broadcast(ttd[0].cnd);
erl_drv_mutex_unlock(ttd[0].mtx);
for (t = 1; t <= join; t++)
erl_drv_thread_join(td->tids[t], NULL);
}
if (ttd[0].mtx)
erl_drv_mutex_destroy(ttd[0].mtx);
if (ttd[0].cnd)
erl_drv_cond_destroy(ttd[0].cnd);
for (b = 0; b < BLOCKS_PER_THREAD; b++) {
for (t = 0; t <= NO_THREADS; t++) {
if (ttd[t].blocks[b] != NULL)
driver_free(ttd[t].blocks[b]);
}
}
driver_free(td);
return ERL_DRV_ERROR_GENERAL;
}
static void stop(ErlDrvData drv_data)
{
test_data *td = (test_data *) drv_data;
int t, b;
for (t = 1; t <= NO_THREADS; t++)
erl_drv_thread_join(td->tids[t], NULL);
for (b = 0; b < BLOCKS_PER_THREAD; b++) {
if (td->ttd[0].blocks[b])
driver_free(td->ttd[0].blocks[b]);
}
erl_drv_mutex_destroy(td->ttd[0].mtx);
erl_drv_cond_destroy(td->ttd[0].cnd);
driver_free(td);
}
static int control(ErlDrvData drv_data, unsigned int command, char *buf,
int len, char **rbuf, int rlen)
{
test_data *td = (test_data *) drv_data;
char *result = "failure";
int i, b;
int res;
int result_len;
if (td->b == -1) {
erl_drv_mutex_lock(td->ttd[0].mtx);
td->go = 1;
erl_drv_cond_broadcast(td->ttd[0].cnd);
erl_drv_mutex_unlock(td->ttd[0].mtx);
td->b = 0;
}
for (i = 0, b = td->b; i < BLOCKS_PER_CTRL && b < BLOCKS_PER_THREAD; i++, b++) {
driver_free(td->ttd[0].blocks[b]);
td->ttd[0].blocks[b] = NULL;
}
td->b = b;
if (b >= BLOCKS_PER_THREAD)
result = "done";
else
result = "more";
result_len = strlen(result);
if (result_len <= rlen) {
memcpy(*rbuf, result, result_len);
return result_len;
}
else {
*rbuf = driver_alloc(result_len);
if (!*rbuf) {
driver_failure_posix(td->port, ENOMEM);
return 0;
}
else {
memcpy(*rbuf, result, result_len);
return result_len;
}
}
}
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