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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSImplClassicRegion
*
* @brief This source file contains the implementation of
* _Region_Process_queue().
*/
/*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#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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