/**
* @file
*
* @brief Thread Queue Operations
* @ingroup ScoreThreadQ
*/
/*
* COPYRIGHT (c) 1989-2014.
* 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.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/threadqimpl.h>
#include <rtems/score/assert.h>
#include <rtems/score/threaddispatch.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/watchdogimpl.h>
#define THREAD_QUEUE_INTEND_TO_BLOCK \
(THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_INTEND_TO_BLOCK)
#define THREAD_QUEUE_BLOCKED \
(THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_BLOCKED)
#define THREAD_QUEUE_READY_AGAIN \
(THREAD_WAIT_CLASS_OBJECT | THREAD_WAIT_STATE_READY_AGAIN)
static void _Thread_queue_Unblock( Thread_Control *the_thread )
{
_Watchdog_Remove_ticks( &the_thread->Timer );
_Thread_Unblock( the_thread );
#if defined(RTEMS_MULTIPROCESSING)
if ( !_Objects_Is_local_id( the_thread->Object.id ) ) {
_Thread_MP_Free_proxy( the_thread );
}
#endif
}
void _Thread_queue_Enqueue_critical(
Thread_queue_Control *the_thread_queue,
Thread_Control *the_thread,
States_Control state,
Watchdog_Interval timeout,
uint32_t timeout_code,
ISR_lock_Context *lock_context
)
{
const Thread_queue_Operations *operations;
Per_CPU_Control *cpu_self;
bool success;
_Thread_Lock_set( the_thread, &the_thread_queue->Lock );
operations = the_thread_queue->operations;
_Thread_Wait_set_queue( the_thread, the_thread_queue );
_Thread_Wait_set_operations( the_thread, operations );
( *operations->enqueue )( the_thread_queue, the_thread );
_Thread_Wait_flags_set( the_thread, THREAD_QUEUE_INTEND_TO_BLOCK );
cpu_self = _Thread_Dispatch_disable_critical();
_Thread_queue_Release( the_thread_queue, lock_context );
#if defined(RTEMS_MULTIPROCESSING)
if ( _Thread_MP_Is_receive( the_thread ) && the_thread->receive_packet )
the_thread = _Thread_MP_Allocate_proxy( state );
else
#endif
/*
* Set the blocking state for this thread queue in the thread.
*/
_Thread_Set_state( the_thread, state );
/*
* If the thread wants to timeout, then schedule its timer.
*/
if ( timeout != WATCHDOG_NO_TIMEOUT ) {
_Thread_Wait_set_timeout_code( the_thread, timeout_code );
_Watchdog_Initialize( &the_thread->Timer, _Thread_Timeout, 0, the_thread );
_Watchdog_Insert_ticks( &the_thread->Timer, timeout );
}
success = _Thread_Wait_flags_try_change(
the_thread,
THREAD_QUEUE_INTEND_TO_BLOCK,
THREAD_QUEUE_BLOCKED
);
if ( !success ) {
_Thread_queue_Unblock( the_thread );
}
_Thread_Dispatch_enable( cpu_self );
}
void _Thread_queue_Extract_locked(
Thread_queue_Control *the_thread_queue,
Thread_Control *the_thread
)
{
( *the_thread_queue->operations->extract )( the_thread_queue, the_thread );
_Thread_Wait_set_queue( the_thread, NULL );
_Thread_Wait_restore_default_operations( the_thread );
_Thread_Lock_restore_default( the_thread );
}
void _Thread_queue_Unblock_critical(
Thread_queue_Control *the_thread_queue,
Thread_Control *the_thread,
ISR_lock_Context *lock_context
)
{
bool success;
bool unblock;
success = _Thread_Wait_flags_try_change_critical(
the_thread,
THREAD_QUEUE_INTEND_TO_BLOCK,
THREAD_QUEUE_READY_AGAIN
);
if ( success ) {
unblock = false;
} else {
_Assert( _Thread_Wait_flags_get( the_thread ) == THREAD_QUEUE_BLOCKED );
_Thread_Wait_flags_set( the_thread, THREAD_QUEUE_READY_AGAIN );
unblock = true;
}
if ( unblock ) {
Per_CPU_Control *cpu_self;
cpu_self = _Thread_Dispatch_disable_critical();
_Thread_queue_Release( the_thread_queue, lock_context );
_Thread_queue_Unblock( the_thread );
_Thread_Dispatch_enable( cpu_self );
} else {
_Thread_queue_Release( the_thread_queue, lock_context );
}
}
void _Thread_queue_Extract_critical(
Thread_queue_Control *the_thread_queue,
Thread_Control *the_thread,
ISR_lock_Context *lock_context
)
{
_Thread_queue_Extract_locked( the_thread_queue, the_thread );
_Thread_queue_Unblock_critical( the_thread_queue, the_thread, lock_context );
}
void _Thread_queue_Extract( Thread_Control *the_thread )
{
ISR_lock_Context lock_context;
ISR_lock_Control *lock;
Thread_queue_Control *the_thread_queue;
lock = _Thread_Lock_acquire( the_thread, &lock_context );
the_thread_queue = the_thread->Wait.queue;
if ( the_thread_queue != NULL ) {
_SMP_Assert( lock == &the_thread_queue->Lock );
_Thread_queue_Extract_critical( the_thread_queue, the_thread, &lock_context );
} else {
_Thread_Lock_release( lock, &lock_context );
}
}
Thread_Control *_Thread_queue_Dequeue( Thread_queue_Control *the_thread_queue )
{
ISR_lock_Context lock_context;
Thread_Control *the_thread;
_Thread_queue_Acquire( the_thread_queue, &lock_context );
the_thread = _Thread_queue_First_locked( the_thread_queue );
if ( the_thread != NULL ) {
_SMP_Assert( the_thread->Lock.current == &the_thread_queue->Lock );
_Thread_queue_Extract_critical( the_thread_queue, the_thread, &lock_context );
} else {
_Thread_queue_Release( the_thread_queue, &lock_context );
}
return the_thread;
}