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/**
* @file
*
* @ingroup RTEMSImplClassicRegion
*
* @brief This source file contains the implementation of
* _Region_Process_queue().
*/
/*
* 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.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/regionimpl.h>
#include <rtems/score/status.h>
#include <rtems/score/threadqimpl.h>
void _Region_Process_queue(
Region_Control *the_region
)
{
Per_CPU_Control *cpu_self;
Thread_Control *the_thread;
void *the_segment;
/*
* Switch from using the memory allocation mutex to using a
* dispatching disabled critical section. We have to do this
* because this thread may unblock one or more threads that were
* waiting on memory.
*
* NOTE: Be sure to disable dispatching before unlocking the mutex
* since we do not want to open a window where a context
* switch could occur.
*/
cpu_self = _Thread_Dispatch_disable();
_Region_Unlock( the_region );
/*
* NOTE: The following loop is O(n) where n is the number of
* threads whose memory request is satisfied.
*/
for ( ; ; ) {
the_thread = _Thread_queue_First(
&the_region->Wait_queue,
the_region->wait_operations
);
if ( the_thread == NULL )
break;
the_segment = (void **) _Region_Allocate_segment(
the_region,
the_thread->Wait.count
);
if ( the_segment == NULL )
break;
*(void **)the_thread->Wait.return_argument = the_segment;
_Thread_queue_Extract( the_thread );
the_thread->Wait.return_code = STATUS_SUCCESSFUL;
}
_Thread_Dispatch_enable( cpu_self );
}
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