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/***************************************************************************
lib/async.c
-------------------
copyright : (C) 2002 by Frank Mori Hess
email : fmhess@users.sourceforge.net
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "ib_internal.h"
#include <sys/ioctl.h>
#include <stdlib.h>
#include <pthread.h>
static void* do_aio(void *varg);
struct gpib_aio_arg
{
int ud;
ibConf_t *conf;
int gpib_aio_type;
int condition_flag;
unsigned int usec_timeout;
};
void init_async_op(struct async_operation *async)
{
pthread_mutex_init(&async->lock, NULL);
pthread_mutex_init(&async->join_lock, NULL);
pthread_cond_init(&async->condition, NULL);
async->buffer = NULL;
async->buffer_length = 0;
async->iberr = 0;
async->ibsta = 0;
async->ibcntl = 0;
async->in_progress = 0;
async->abort = 0;
}
static void cleanup_aio(void *varg)
{
struct gpib_aio_arg arg = *((struct gpib_aio_arg*) varg);
ibBoard_t *board = interfaceBoard(arg.conf);
ibstatus(arg.conf, 0, 0, CMPL); // set CMPL flag
int retval = unlock_board_mutex(board);
assert(retval == 0);
}
int gpib_aio_launch(int ud, ibConf_t *conf, int gpib_aio_type,
void *buffer, long cnt)
{
int retval;
struct gpib_aio_arg *arg;
pthread_attr_t attributes;
arg = malloc(sizeof(*arg));
if (arg == NULL) {
setIberr(EDVR);
setIbcnt(ENOMEM);
return -1;
}
arg->ud = ud;
arg->conf = conf;
arg->gpib_aio_type = gpib_aio_type;
arg->condition_flag = 0;
arg->usec_timeout = conf->settings.usec_timeout; // Copy timeout
pthread_mutex_lock(&conf->async.lock);
if (conf->async.in_progress) {
pthread_mutex_unlock(&conf->async.lock);
setIberr(EOIP);
return -1;
}
conf->async.ibsta = 0;
conf->async.ibcntl = 0;
conf->async.iberr = 0;
conf->async.buffer = buffer;
conf->async.buffer_length = cnt;
conf->async.abort = 0;
conf->async.aio_type = gpib_aio_type; /* used in my_ibcmd to suppress setting CMPL */
pthread_attr_init(&attributes);
pthread_attr_setstacksize(&attributes, 0x10000);
retval = pthread_create(&conf->async.thread,
&attributes, do_aio, arg);
pthread_attr_destroy(&attributes);
conf->async.in_progress = (retval == 0);
while (arg->condition_flag == 0)
pthread_cond_wait(&conf->async.condition, &conf->async.lock);
pthread_mutex_unlock(&conf->async.lock);
free(arg);
arg = NULL;
if (retval) {
setIberr(EDVR);
setIbcnt(retval);
return -1;
}
return 0;
}
static void* do_aio(void *varg)
{
size_t count;
struct gpib_aio_arg * const arg_p = (struct gpib_aio_arg*) varg;
struct gpib_aio_arg arg;
ibConf_t *conf;
ibBoard_t *board;
unsigned int usec_timeout;
int retval;
arg = *arg_p;
conf = arg.conf;
usec_timeout = arg.usec_timeout;
board = interfaceBoard(conf);
retval = lock_board_mutex(board);
if (retval == 0)
ibstatus(conf, 0, CMPL, 0); // clear CMPL flag
pthread_mutex_lock(&conf->async.lock);
arg_p->condition_flag = 1;
pthread_cond_broadcast(&conf->async.condition);
pthread_mutex_unlock(&conf->async.lock);
// don't use arg_p after this point, it may be
// deallocated by the thread which launched this one.
if (retval < 0)
return NULL;
pthread_cleanup_push(cleanup_aio, &arg);
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
switch(arg.gpib_aio_type) {
case GPIB_AIO_COMMAND:
count = retval = my_ibcmd(conf, usec_timeout, conf->async.buffer, conf->async.buffer_length);
break;
case GPIB_AIO_READ:
retval = my_ibrd(conf, usec_timeout, conf->async.buffer, conf->async.buffer_length, &count);
break;
case GPIB_AIO_WRITE:
retval = my_ibwrt(conf, usec_timeout, conf->async.buffer, conf->async.buffer_length, &count);
break;
default:
retval = -1;
fprintf(stderr, "libgpib: bug! in %s\n", __FUNCTION__);
break;
}
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
pthread_mutex_lock(&conf->async.lock);
if (retval < 0) {
if (ThreadIberr() != EDVR)
conf->async.ibcntl = count;
else
conf->async.ibcntl = ThreadIbcntl();
conf->async.iberr = ThreadIberr();
conf->async.ibsta = CMPL | ERR;
} else {
conf->async.ibcntl = count;
conf->async.iberr = 0;
conf->async.ibsta = CMPL;
if (conf->end) conf->async.ibsta |= END;
if (conf->timed_out) conf->async.ibsta |= TIMO;
}
pthread_mutex_unlock(&conf->async.lock);
pthread_cleanup_pop(1);
return NULL;
}
int gpib_aio_join(struct async_operation *async)
{
int retval;
pthread_mutex_lock(&async->join_lock);
retval = pthread_join(async->thread, NULL);
pthread_mutex_unlock(&async->join_lock);
switch(retval) {
case 0:
setAsyncIbsta(async->ibsta);
setAsyncIberr(async->iberr);
setAsyncIbcnt(async->ibcntl);
break;
case ESRCH: /* thread has already been joined */
retval = 0;
break;
default:
fprintf(stderr, "libgpib: pthread_join() returned %i in %s\n",
retval, __FUNCTION__);
setIberr(EDVR);
setIbcnt(retval);
break;
}
return retval;
}
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