forked from Imagelibrary/rtems
d50acdbb6c
Add a local context structure to the SMP lock API for acquire and release pairs. This context can be used to store the ISR level and profiling information. It may be later used to enable more sophisticated lock algorithms, e.g. MCS locks. There is only one lock that cannot be used with a local context. This is the per-CPU lock since here we would have to transfer the local context through a context switch which is very complicated.
137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
/*
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* Copyright (c) 2013-2014 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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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.com/license/LICENSE.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/chain.h>
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#if defined( RTEMS_SMP )
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#include <rtems/score/smplock.h>
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static SMP_lock_Control chain_lock = SMP_LOCK_INITIALIZER;
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static void chain_acquire( SMP_lock_Context *lock_context )
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{
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_SMP_lock_ISR_disable_and_acquire( &chain_lock, lock_context );
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}
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static void chain_release( SMP_lock_Context *lock_context )
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{
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_SMP_lock_Release_and_ISR_enable( &chain_lock, lock_context );
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}
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void rtems_chain_extract( rtems_chain_node *node )
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{
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SMP_lock_Context lock_context;
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chain_acquire( &lock_context );
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_Chain_Extract_unprotected( node );
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chain_release( &lock_context );
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}
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rtems_chain_node *rtems_chain_get( rtems_chain_control *chain )
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{
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rtems_chain_node *node;
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SMP_lock_Context lock_context;
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chain_acquire( &lock_context );
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node = _Chain_Get_unprotected( chain );
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chain_release( &lock_context );
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return node;
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}
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void rtems_chain_insert( rtems_chain_node *after_node, rtems_chain_node *node )
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{
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SMP_lock_Context lock_context;
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chain_acquire( &lock_context );
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_Chain_Insert_unprotected( after_node, node );
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chain_release( &lock_context );
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}
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void rtems_chain_append(
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rtems_chain_control *chain,
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rtems_chain_node *node
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)
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{
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SMP_lock_Context lock_context;
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chain_acquire( &lock_context );
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_Chain_Append_unprotected( chain, node );
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chain_release( &lock_context );
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}
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void rtems_chain_prepend(
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rtems_chain_control *chain,
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rtems_chain_node *node
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)
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{
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SMP_lock_Context lock_context;
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chain_acquire( &lock_context );
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_Chain_Prepend_unprotected( chain, node );
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chain_release( &lock_context );
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}
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bool rtems_chain_append_with_empty_check(
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rtems_chain_control *chain,
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rtems_chain_node *node
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)
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{
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bool was_empty;
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SMP_lock_Context lock_context;
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chain_acquire( &lock_context );
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was_empty = _Chain_Append_with_empty_check_unprotected( chain, node );
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chain_release( &lock_context );
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return was_empty;
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}
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bool rtems_chain_prepend_with_empty_check(
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rtems_chain_control *chain,
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rtems_chain_node *node
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)
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{
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bool was_empty;
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SMP_lock_Context lock_context;
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chain_acquire( &lock_context );
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was_empty = _Chain_Prepend_with_empty_check_unprotected( chain, node );
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chain_release( &lock_context );
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return was_empty;
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}
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bool rtems_chain_get_with_empty_check(
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rtems_chain_control *chain,
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rtems_chain_node **node
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)
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{
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bool is_empty_now;
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SMP_lock_Context lock_context;
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chain_acquire( &lock_context );
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is_empty_now = _Chain_Get_with_empty_check_unprotected( chain, node );
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chain_release( &lock_context );
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return is_empty_now;
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}
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#endif /* defined( RTEMS_SMP ) */
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