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/*
* COPYRIGHT (c) 1989-2008.
* 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.
*
* $Id$
*/
#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
*
* 18.2.3.1 Establishing Cancellation Handlers, P1003.1c/Draft 10, p. 184
*/
void pthread_cleanup_pop(
int execute
)
{
POSIX_Cancel_Handler_control *handler;
POSIX_Cancel_Handler_control tmp_handler;
Chain_Control *handler_stack;
POSIX_API_Control *thread_support;
ISR_Level level;
thread_support = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ];
handler_stack = &thread_support->Cancellation_Handlers;
/*
* We need interrupts disabled to safely check the chain and pull
* the last element off. But we also need dispatching disabled to
* ensure that we do not get prempted and deleted while we are holding
* memory that needs to be freed.
*/
_Thread_Disable_dispatch();
_ISR_Disable( level );
if ( _Chain_Is_empty( handler_stack ) ) {
_Thread_Enable_dispatch();
_ISR_Enable( level );
return;
}
handler = (POSIX_Cancel_Handler_control *)
_Chain_Tail( handler_stack )->previous;
_Chain_Extract_unprotected( &handler->Node );
_ISR_Enable( level );
tmp_handler = *handler;
_Workspace_Free( handler );
_Thread_Enable_dispatch();
if ( execute )
(*tmp_handler.routine)( tmp_handler.arg );
}
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