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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%
*/
#ifdef __WIN32__
#include <windows.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "erl_driver.h"
static void stop(ErlDrvData drv_data);
static ErlDrvData start(ErlDrvPort port,
char *command);
static void output(ErlDrvData drv_data,
char *buf, ErlDrvSizeT len);
static void ready_async(ErlDrvData drv_data,
ErlDrvThreadData thread_data);
static ErlDrvEntry otp_9302_drv_entry = {
NULL /* init */,
start,
stop,
output,
NULL /* ready_input */,
NULL /* ready_output */,
"otp_9302_drv",
NULL /* finish */,
NULL /* handle */,
NULL /* control */,
NULL /* timeout */,
NULL /* outputv */,
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 Otp9302AsyncData_ Otp9302AsyncData;
typedef struct {
ErlDrvMutex *mtx;
Otp9302AsyncData *start;
Otp9302AsyncData *end;
} Otp9302MsgQ;
typedef struct {
ErlDrvPort port;
int smp;
Otp9302MsgQ msgq;
} Otp9302Data;
struct Otp9302AsyncData_ {
Otp9302AsyncData *next;
ErlDrvPort port;
int smp;
int refc;
int block;
struct {
ErlDrvTermData port;
ErlDrvTermData receiver;
ErlDrvTermData msg;
} term_data;
Otp9302MsgQ *msgq;
};
DRIVER_INIT(otp_9302_drv)
{
return &otp_9302_drv_entry;
}
static void stop(ErlDrvData drv_data)
{
Otp9302Data *data = (Otp9302Data *) drv_data;
if (!data->smp)
erl_drv_mutex_destroy(data->msgq.mtx);
driver_free(data);
}
static ErlDrvData start(ErlDrvPort port,
char *command)
{
Otp9302Data *data;
ErlDrvSysInfo sys_info;
data = driver_alloc(sizeof(Otp9302Data));
if (!data)
return ERL_DRV_ERROR_GENERAL;
data->port = port;
driver_system_info(&sys_info, sizeof(ErlDrvSysInfo));
data->smp = sys_info.smp_support;
if (!data->smp) {
data->msgq.start = NULL;
data->msgq.end = NULL;
data->msgq.mtx = erl_drv_mutex_create("");
if (!data->msgq.mtx) {
driver_free(data);
return ERL_DRV_ERROR_GENERAL;
}
}
return (ErlDrvData) data;
}
static void send_reply(Otp9302AsyncData *adata)
{
ErlDrvTermData spec[] = {
ERL_DRV_PORT, adata->term_data.port,
ERL_DRV_ATOM, adata->term_data.msg,
ERL_DRV_TUPLE, 2
};
driver_send_term(adata->port, adata->term_data.receiver,
spec, sizeof(spec)/sizeof(spec[0]));
}
static void enqueue_reply(Otp9302AsyncData *adata)
{
Otp9302MsgQ *msgq = adata->msgq;
adata->next = NULL;
adata->refc++;
erl_drv_mutex_lock(msgq->mtx);
if (msgq->end)
msgq->end->next = adata;
else
msgq->end = msgq->start = adata;
msgq->end = adata;
erl_drv_mutex_unlock(msgq->mtx);
}
static void dequeue_replies(Otp9302AsyncData *adata)
{
Otp9302MsgQ *msgq = adata->msgq;
erl_drv_mutex_lock(msgq->mtx);
if (--adata->refc == 0)
driver_free(adata);
while (msgq->start) {
send_reply(msgq->start);
adata = msgq->start;
msgq->start = msgq->start->next;
if (--adata->refc == 0)
driver_free(adata);
}
msgq->start = msgq->end = NULL;
erl_drv_mutex_unlock(msgq->mtx);
}
static void async_invoke(void *data)
{
Otp9302AsyncData *adata = (Otp9302AsyncData *) data;
if (adata->block) {
#ifdef __WIN32__
Sleep((DWORD) 2000);
#else
sleep(2);
#endif
}
if (adata->smp)
send_reply(adata);
else
enqueue_reply(adata);
}
static void ready_async(ErlDrvData drv_data,
ErlDrvThreadData thread_data)
{
Otp9302AsyncData *adata = (Otp9302AsyncData *) thread_data;
if (adata->smp)
driver_free(adata);
else
dequeue_replies(adata);
}
static void output(ErlDrvData drv_data,
char *buf, ErlDrvSizeT len)
{
Otp9302Data *data = (Otp9302Data *) drv_data;
ErlDrvTermData td_port = driver_mk_port(data->port);
ErlDrvTermData td_receiver = driver_caller(data->port);
ErlDrvTermData td_job = driver_mk_atom("job");
unsigned int key = (unsigned int) (ErlDrvSInt) data->port;
long id[5];
Otp9302AsyncData *ad[5];
int i;
for (i = 0; i < sizeof(ad)/sizeof(ad[0]); i++) {
ad[i] = driver_alloc(sizeof(Otp9302AsyncData));
if (!ad[i])
abort();
ad[i]->smp = data->smp;
ad[i]->port = data->port;
ad[i]->block = 0;
ad[i]->refc = 1;
ad[i]->term_data.port = td_port;
ad[i]->term_data.receiver = td_receiver;
ad[i]->term_data.msg = td_job;
ad[i]->msgq = &data->msgq;
}
ad[0]->block = 1;
ad[0]->term_data.msg = driver_mk_atom("block");
ad[2]->term_data.msg = driver_mk_atom("cancel");
ad[4]->term_data.msg = driver_mk_atom("end_of_jobs");
for (i = 0; i < sizeof(id)/sizeof(id[0]); i++)
id[i] = driver_async(data->port, &key, async_invoke, ad[i], driver_free);
if (id[2] > 0)
driver_async_cancel(id[2]);
}
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