forked from Imagelibrary/rtems
91e7b0c5ae
Add _Thread_queue_Extract_with_return_code(). On SMP this sequence in
_Thread_queue_Process_timeout() was broken:
[...]
/*
* After we enable interrupts here, a lot may happen in the
* meantime, e.g. nested interrupts may release the resource that
* times out here. So we enter _Thread_queue_Extract()
* speculatively. Inside this function we check the actual status
* under ISR disable protection. This ensures that exactly one
* executing context performs the extract operation (other parties
* may call _Thread_queue_Dequeue()). If this context won, then
* we have a timeout.
*
* We can use the_thread_queue pointer here even if
* the_thread->Wait.queue is already set to NULL since the extract
* operation will only use the thread queue discipline to select
* the right extract operation. The timeout status is set during
* thread queue initialization.
*/
we_did_it = _Thread_queue_Extract( the_thread_queue, the_thread );
if ( we_did_it ) {
the_thread->Wait.return_code = the_thread_queue->timeout_status;
}
[...]
In case _Thread_queue_Extract() successfully extracted a thread, then
this thread may start execution on a remote processor immediately and
read the the_thread->Wait.return_code before we update it here with the
timeout status. Thus it observes a successful operation even if it
timed out.
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/*
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* COPYRIGHT (c) 1989-2009.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tmacros.h>
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#include <sys/types.h>
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#include <rtems/score/threadqimpl.h>
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const char rtems_test_name[] = "SPTHREADQ 1";
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/* forward declarations to avoid warnings */
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rtems_task Init(rtems_task_argument argument);
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void threadq_first_empty(
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const char *discipline_string,
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Thread_queue_Disciplines discipline
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);
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void threadq_first_empty(
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const char *discipline_string,
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Thread_queue_Disciplines discipline
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)
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{
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Thread_queue_Control tq;
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printf( "Init - initialize thread queue for %s\n", discipline_string );
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_Thread_queue_Initialize( &tq, discipline, 0x01, 3 );
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puts( "Init - _Thread_queue_Extract - thread not blocked on a thread queue" );
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_Thread_Disable_dispatch();
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_Thread_queue_Extract( &tq, _Thread_Executing );
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_Thread_Enable_dispatch();
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/* is there more to check? */
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}
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rtems_task Init(
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rtems_task_argument ignored
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)
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{
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TEST_BEGIN();
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threadq_first_empty( "FIFO", THREAD_QUEUE_DISCIPLINE_FIFO );
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threadq_first_empty( "Priority", THREAD_QUEUE_DISCIPLINE_PRIORITY );
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TEST_END();
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rtems_test_exit(0);
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}
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/* configuration information */
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#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
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#define CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER
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#define CONFIGURE_MAXIMUM_TASKS 1
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#define CONFIGURE_INITIAL_EXTENSIONS RTEMS_TEST_INITIAL_EXTENSION
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#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
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#define CONFIGURE_INIT
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#include <rtems/confdefs.h>
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/* global variables */
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