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/*

 *  cancel.c,v 1.9 2002/07/05 18:13:18 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <pthread.h>

#include <errno.h>

#include <rtems/system.h>

#include <rtems/score/chain.h>

#include <rtems/score/isr.h>

#include <rtems/score/thread.h>

#include <rtems/score/wkspace.h>

#include <rtems/posix/cancel.h>

#include <rtems/posix/pthread.h>

#include <rtems/posix/threadsup.h>

/*PAGE

 *

 *  18.2.1 Canceling Execution of a Thread, P1003.1c/Draft 10, p. 181

 */

int pthread_cancel(

  pthread_t  thread

)

{

  Thread_Control                    *the_thread;

  POSIX_API_Control                 *thread_support;

  Objects_Locations                  location;

  /*

   *  Don't even think about deleting a resource from an ISR.

   */

  if ( _ISR_Is_in_progress() )

    return EPROTO;

  the_thread = _POSIX_Threads_Get( thread, &location );

  switch ( location ) {

    case OBJECTS_ERROR:

      return EINVAL;

    case OBJECTS_REMOTE:

      return POSIX_MP_NOT_IMPLEMENTED();

    case OBJECTS_LOCAL:

      thread_support = the_thread->API_Extensions[ THREAD_API_POSIX ];

      thread_support->cancelation_requested = 1;

      if ( thread_support->cancelability_state == PTHREAD_CANCEL_ENABLE &&

           thread_support->cancelability_type == PTHREAD_CANCEL_ASYNCHRONOUS ) {

        _POSIX_Threads_cancel_run( the_thread );

      }

      _Thread_Enable_dispatch();

      return 0;

  }

  return POSIX_BOTTOM_REACHED();

}