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/*
* Task Delete Shell Command Implmentation
*
* COPYRIGHT (c) 1989-2013.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <rtems.h>
#include "shell.h"
#include <rtems/stringto.h>
#include <schedsim_shell.h>
#include <rtems/error.h>
static Thread_Control *get_thread_executing(void)
{
Thread_Control *e;
_Thread_Disable_dispatch();
e = _Thread_Executing;
_Thread_Enable_dispatch();
return e;
}
int rtems_shell_main_semaphore_obtain(
int argc,
char *argv[]
)
{
rtems_id id;
rtems_status_code status;
long tmp;
rtems_interval ticks;
Thread_Control *caller;
/* XXX for now, do not support polling */
CHECK_RTEMS_IS_UP();
if (argc != 3) {
fprintf( stderr, "%s: Usage name|id timeout\n", argv[0] );
return -1;
}
if ( lookup_semaphore( argv[1], &id ) )
return -1;
if ( rtems_string_to_long(argv[2], &tmp, NULL, 0) ) {
printf( "Ceiling argument (%s) is not a number\n", argv[1] );
return -1;
}
ticks = tmp;
/*
* Now obtain the semaphore
*
* If the calling thread blocks, we will return as another thread
* but with a "unsatisfied" return code. So we check that we did
* a thread switch inside the semaphore obtain. If we did, then
* just return successfully.
*/
caller = get_thread_executing();
printf("Obtain semaphore (0x%08x) with timeout %d\n", id, ticks );
status = rtems_semaphore_obtain( id, RTEMS_DEFAULT_OPTIONS, ticks );
if ( caller == get_thread_executing() ) {
if ( status != RTEMS_SUCCESSFUL ) {
fprintf(
stderr,
"Semaphore obtain(%s) returned %s\n",
argv[1],
rtems_status_text( status )
);
return -1;
}
}
return 0;
}
rtems_shell_cmd_t rtems_shell_SEMAPHORE_OBTAIN_Command = {
"semaphore_obtain", /* name */
"semaphore_obtain name ticks", /* usage */
"rtems", /* topic */
rtems_shell_main_semaphore_obtain, /* command */
NULL, /* alias */
NULL /* next */
};
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