blob: 04d56d409d97a2d1069bc13151d80f6191f3ca18 (
plain) (
tree)
|
|
/*
* rtems_task_variable_add - Add a per-task variable
*
*
* COPYRIGHT (c) 1989-1999.
* 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.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <rtems/system.h>
#include <rtems/rtems/tasks.h>
#include <rtems/score/wkspace.h>
/*
* rtems_task_variable_add
*
* This directive registers a task variable.
*/
rtems_status_code rtems_task_variable_add(
rtems_id tid,
void **ptr,
void (*dtor)(void *)
)
{
Thread_Control *the_thread;
Objects_Locations location;
rtems_task_variable_t *tvp, *new;
the_thread = _Thread_Get (tid, &location);
switch (location) {
case OBJECTS_REMOTE:
#if defined(RTEMS_MULTIPROCESSING)
_Thread_Dispatch();
return RTEMS_ILLEGAL_ON_REMOTE_OBJECT;
#endif
case OBJECTS_ERROR:
return RTEMS_INVALID_ID;
default:
return RTEMS_INTERNAL_ERROR;
case OBJECTS_LOCAL:
/*
* Figure out if the variable is already in this task's list.
*/
tvp = the_thread->task_variables;
while (tvp) {
if (tvp->ptr == ptr) {
tvp->dtor = dtor;
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
tvp = tvp->next;
}
/*
* Now allocate memory for this task variable.
*/
new = (rtems_task_variable_t *)
_Workspace_Allocate(sizeof(rtems_task_variable_t));
if (new == NULL) {
_Thread_Enable_dispatch();
return RTEMS_NO_MEMORY;
}
new->gval = *ptr;
new->ptr = ptr;
new->dtor = dtor;
new->next = the_thread->task_variables;
the_thread->task_variables = new;
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */
}
|