forked from Imagelibrary/rtems
score: Add an SMP sequence lock implementation
This commit is contained in:
Sebastian Huber
@@ -82,6 +82,7 @@ include_rtems_score_HEADERS += include/rtems/score/schedulersmpimpl.h
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include_rtems_score_HEADERS += include/rtems/score/smp.h
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include_rtems_score_HEADERS += include/rtems/score/smpbarrier.h
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include_rtems_score_HEADERS += include/rtems/score/smplock.h
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include_rtems_score_HEADERS += include/rtems/score/smplockseq.h
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include_rtems_score_HEADERS += include/rtems/score/smpimpl.h
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include_rtems_score_HEADERS += include/rtems/score/stack.h
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include_rtems_score_HEADERS += include/rtems/score/stackimpl.h
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173
cpukit/score/include/rtems/score/smplockseq.h
Normal file
173
cpukit/score/include/rtems/score/smplockseq.h
Normal file
@@ -0,0 +1,173 @@
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/**
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* @file
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*
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* @ingroup ScoreSMPLock
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*
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* @brief SMP Lock API
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*/
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/*
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* Copyright (c) 2016 embedded brains GmbH
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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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#ifndef _RTEMS_SCORE_SMPLOCKSEQ_H
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#define _RTEMS_SCORE_SMPLOCKSEQ_H
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#include <rtems/score/cpuopts.h>
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#if defined(RTEMS_SMP)
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#include <rtems/score/atomic.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/**
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* @addtogroup ScoreSMPLock
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*
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* @{
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*/
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/**
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* @brief SMP sequence lock control.
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*
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* The sequence lock offers a consistent data set for readers in the presence
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* of at most one concurrent writer. Due to the read-modify-write operation in
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* _SMP_sequence_lock_Read_retry() the data corresponding to the last written
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* sequence number is observed. To allow multiple writers an additional SMP
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* lock is necessary to serialize writes.
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*
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* See also Hans-J. Boehm, HP Laboratories,
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* "Can Seqlocks Get Along With Programming Language Memory Models?",
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* http://www.hpl.hp.com/techreports/2012/HPL-2012-68.pdf
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*/
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typedef struct {
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/**
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* @brief The sequence number.
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*
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* An odd value indicates that a write is in progress.
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*/
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Atomic_Uint sequence;
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} SMP_sequence_lock_Control;
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/**
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* @brief SMP sequence lock control initializer for static initialization.
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*/
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#define SMP_SEQUENCE_LOCK_INITIALIZER { ATOMIC_INITIALIZER_UINT( 0 ) }
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/**
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* @brief Initializes an SMP sequence lock.
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*
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* Concurrent initialization leads to unpredictable results.
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*
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* @param lock The SMP sequence lock control.
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*/
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static inline void _SMP_sequence_lock_Initialize( SMP_sequence_lock_Control *lock )
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{
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_Atomic_Init_uint( &lock->sequence, 0 );
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}
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/**
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* @brief Destroys an SMP sequence lock.
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*
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* Concurrent destruction leads to unpredictable results.
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*
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* @param lock The SMP sequence lock control.
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*/
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static inline void _SMP_sequence_lock_Destroy( SMP_sequence_lock_Control *lock )
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{
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(void) lock;
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}
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/**
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* @brief Begins an SMP sequence lock write operation.
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*
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* This function will not disable interrupts. The caller must ensure that the
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* current thread of execution is not interrupted indefinite since this would
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* starve readers.
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*
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* @param lock The SMP sequence lock control.
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*
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* @return The current sequence number.
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*/
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static inline unsigned int _SMP_sequence_lock_Write_begin(
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SMP_sequence_lock_Control *lock
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)
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{
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unsigned int seq;
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seq = _Atomic_Load_uint( &lock->sequence, ATOMIC_ORDER_RELAXED );
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_Atomic_Store_uint( &lock->sequence, seq + 1, ATOMIC_ORDER_RELAXED );
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/* There is no atomic store with acquire/release semantics */
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_Atomic_Fence( ATOMIC_ORDER_ACQ_REL );
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return seq;
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}
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/**
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* @brief Ends an SMP sequence lock write operation.
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*
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* @param lock The SMP sequence lock control.
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* @param seq The sequence number returned by _SMP_sequence_lock_Write_begin().
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*/
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static inline void _SMP_sequence_lock_Write_end(
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SMP_sequence_lock_Control *lock,
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unsigned int seq
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)
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{
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_Atomic_Store_uint( &lock->sequence, seq + 2, ATOMIC_ORDER_RELEASE );
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}
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/**
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* @brief Begins an SMP sequence lock read operation.
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*
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* This function will not disable interrupts.
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*
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* @param lock The SMP sequence lock control.
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*
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* @return The current sequence number.
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*/
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static inline unsigned int _SMP_sequence_lock_Read_begin(
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const SMP_sequence_lock_Control *lock
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)
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{
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return _Atomic_Load_uint( &lock->sequence, ATOMIC_ORDER_ACQUIRE );
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}
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/**
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* @brief Ends an SMP sequence lock read operation and indicates if a retry is
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* necessary.
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*
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* @param lock The SMP sequence lock control.
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* @param seq The sequence number returned by _SMP_sequence_lock_Read_begin().
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*
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* @retval true The read operation must be retried with a call to
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* _SMP_sequence_lock_Read_begin().
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* @retval false Otherwise.
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*/
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static inline bool _SMP_sequence_lock_Read_retry(
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SMP_sequence_lock_Control *lock,
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unsigned int seq
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)
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{
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unsigned int seq2;
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seq2 = _Atomic_Fetch_add_uint( &lock->sequence, 0, ATOMIC_ORDER_RELEASE );
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return seq != seq2 || seq % 2 != 0;
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}
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/**@}*/
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* RTEMS_SMP */
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#endif /* _RTEMS_SCORE_SMPLOCKSEQ_H */
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@@ -296,6 +296,10 @@ $(PROJECT_INCLUDE)/rtems/score/smplock.h: include/rtems/score/smplock.h $(PROJEC
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$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/rtems/score/smplock.h
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PREINSTALL_FILES += $(PROJECT_INCLUDE)/rtems/score/smplock.h
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$(PROJECT_INCLUDE)/rtems/score/smplockseq.h: include/rtems/score/smplockseq.h $(PROJECT_INCLUDE)/rtems/score/$(dirstamp)
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$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/rtems/score/smplockseq.h
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PREINSTALL_FILES += $(PROJECT_INCLUDE)/rtems/score/smplockseq.h
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$(PROJECT_INCLUDE)/rtems/score/smpimpl.h: include/rtems/score/smpimpl.h $(PROJECT_INCLUDE)/rtems/score/$(dirstamp)
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$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/rtems/score/smpimpl.h
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PREINSTALL_FILES += $(PROJECT_INCLUDE)/rtems/score/smpimpl.h
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@@ -18,6 +18,7 @@
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#include <rtems/score/smplock.h>
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#include <rtems/score/smplockmcs.h>
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#include <rtems/score/smplockseq.h>
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#include <rtems/score/smpbarrier.h>
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#include <rtems/score/atomic.h>
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#include <rtems.h>
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@@ -30,7 +31,7 @@ const char rtems_test_name[] = "SMPLOCK 1";
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#define CPU_COUNT 32
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#define TEST_COUNT 10
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#define TEST_COUNT 11
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typedef enum {
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INITIAL,
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@@ -50,6 +51,11 @@ typedef struct {
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SMP_lock_Stats mcs_stats;
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#endif
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SMP_MCS_lock_Control mcs_lock;
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SMP_sequence_lock_Control seq_lock;
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char unused_space_for_cache_line_separation_0[128];
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int a;
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char unused_space_for_cache_line_separation_1[128];
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int b;
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} global_context;
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static global_context context = {
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@@ -59,7 +65,8 @@ static global_context context = {
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#if defined(RTEMS_PROFILING)
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.mcs_stats = SMP_LOCK_STATS_INITIALIZER("global MCS"),
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#endif
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.mcs_lock = SMP_MCS_LOCK_INITIALIZER
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.mcs_lock = SMP_MCS_LOCK_INITIALIZER,
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.seq_lock = SMP_SEQUENCE_LOCK_INITIALIZER
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};
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static const char * const test_names[TEST_COUNT] = {
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@@ -72,7 +79,8 @@ static const char * const test_names[TEST_COUNT] = {
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"local ticket lock with global counter",
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"local MCS lock with global counter",
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"global ticket lock with busy section",
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"global MCS lock with busy section"
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"global MCS lock with busy section",
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"sequence lock"
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};
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static void stop_test_timer(rtems_id timer_id, void *arg)
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@@ -355,6 +363,49 @@ static void test_9_body(
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ctx->test_counter[test][cpu_self] = counter;
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}
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static void test_10_body(
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int test,
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global_context *ctx,
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SMP_barrier_State *bs,
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unsigned int cpu_count,
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unsigned int cpu_self
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)
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{
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unsigned long counter = 0;
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unsigned long seq;
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if (cpu_self == 0) {
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while (assert_state(ctx, START_TEST)) {
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seq = _SMP_sequence_lock_Write_begin(&ctx->seq_lock);
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ctx->a = counter;
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ctx->b = counter;
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_SMP_sequence_lock_Write_end(&ctx->seq_lock, seq);
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++counter;
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}
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} else {
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while (assert_state(ctx, START_TEST)) {
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unsigned long a;
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unsigned long b;
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do {
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seq = _SMP_sequence_lock_Read_begin(&ctx->seq_lock);
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a = ctx->a;
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b = ctx->b;
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} while (_SMP_sequence_lock_Read_retry(&ctx->seq_lock, seq));
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++counter;
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rtems_test_assert(a == b);
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}
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}
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ctx->test_counter[test][cpu_self] = counter;
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}
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static const test_body test_bodies[TEST_COUNT] = {
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test_0_body,
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test_1_body,
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@@ -365,7 +416,8 @@ static const test_body test_bodies[TEST_COUNT] = {
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test_6_body,
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test_7_body,
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test_8_body,
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test_9_body
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test_9_body,
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test_10_body
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};
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static void run_tests(
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@@ -1,22 +1,288 @@
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*** BEGIN OF TEST SMPLOCK 1 ***
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aquire global lock with local counter
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processor 0, local counter 15964
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processor 1, local counter 99982377
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global counter 0, sum of local counter 99998341
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aquire global lock with global counter
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processor 0, local counter 166073
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processor 1, local counter 99569103
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global counter 99735176, sum of local counter 99735176
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aquire local lock with local counter
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processor 0, local counter 148133948
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processor 1, local counter 148148108
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global counter 0, sum of local counter 296282056
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aquire local lock with global counter
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processor 0, local counter 55938783
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processor 1, local counter 55951781
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global counter 55951781, sum of local counter 111890564
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aquire global lock with busy section
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processor 0, local counter 10694328
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processor 1, local counter 10694346
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global counter 0, sum of local counter 21388674
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global ticket lock with local counter
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processor 0, local counter 830091
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processor 1, local counter 830090
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processor 2, local counter 830091
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processor 3, local counter 830091
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processor 4, local counter 830091
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processor 5, local counter 830091
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processor 6, local counter 830091
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processor 7, local counter 830091
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processor 8, local counter 830089
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processor 9, local counter 830088
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processor 10, local counter 830090
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processor 11, local counter 830090
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processor 12, local counter 830090
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processor 13, local counter 830092
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processor 14, local counter 830093
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processor 15, local counter 830092
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processor 16, local counter 830092
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processor 17, local counter 830092
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processor 18, local counter 830089
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processor 19, local counter 830092
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processor 20, local counter 830090
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processor 21, local counter 830090
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processor 22, local counter 830090
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processor 23, local counter 830092
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global counter 0, sum of local counter 19922178
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global MCS lock with local counter
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processor 0, local counter 1579723
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processor 1, local counter 1580054
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processor 2, local counter 1579890
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processor 3, local counter 1579777
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processor 4, local counter 1579884
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processor 5, local counter 1580005
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processor 6, local counter 1578632
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processor 7, local counter 1578637
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processor 8, local counter 1578774
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processor 9, local counter 1578759
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processor 10, local counter 1580282
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processor 11, local counter 1579885
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processor 12, local counter 1580378
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processor 13, local counter 1580043
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processor 14, local counter 1580115
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processor 15, local counter 1580113
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processor 16, local counter 1579911
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processor 17, local counter 1579993
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processor 18, local counter 1580032
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processor 19, local counter 1579588
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processor 20, local counter 1580049
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processor 21, local counter 1580048
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processor 22, local counter 1578484
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processor 23, local counter 1580013
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global counter 0, sum of local counter 37913069
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global ticket lock with global counter
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processor 0, local counter 784729
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processor 1, local counter 784730
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processor 2, local counter 784730
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processor 3, local counter 784730
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processor 4, local counter 784731
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processor 5, local counter 784730
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processor 6, local counter 784731
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processor 7, local counter 784730
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processor 8, local counter 784731
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processor 9, local counter 784729
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processor 10, local counter 784729
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processor 11, local counter 784730
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processor 12, local counter 784731
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processor 13, local counter 784729
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processor 14, local counter 784728
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processor 15, local counter 784730
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processor 16, local counter 784729
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processor 17, local counter 784730
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processor 18, local counter 784730
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processor 19, local counter 784729
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processor 20, local counter 784729
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processor 21, local counter 784729
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processor 22, local counter 784729
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processor 23, local counter 784731
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global counter 18833514, sum of local counter 18833514
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global MCS lock with global counter
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processor 0, local counter 947856
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processor 1, local counter 947857
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processor 2, local counter 947857
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processor 3, local counter 947855
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processor 4, local counter 947858
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processor 5, local counter 947857
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processor 6, local counter 947856
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processor 7, local counter 947856
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processor 8, local counter 947856
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processor 9, local counter 947856
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processor 10, local counter 947857
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processor 11, local counter 947856
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processor 12, local counter 947855
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processor 13, local counter 947857
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processor 14, local counter 947857
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processor 15, local counter 947855
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processor 16, local counter 947856
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processor 17, local counter 947855
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processor 18, local counter 947858
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processor 19, local counter 947857
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processor 20, local counter 947858
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processor 21, local counter 947857
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processor 22, local counter 947857
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processor 23, local counter 947857
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global counter 22748556, sum of local counter 22748556
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local ticket lock with local counter
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processor 0, local counter 77155869
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processor 1, local counter 77158831
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processor 2, local counter 77081105
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processor 3, local counter 77082737
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processor 4, local counter 77075777
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processor 5, local counter 77076154
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processor 6, local counter 77065268
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processor 7, local counter 77066500
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processor 8, local counter 77106686
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processor 9, local counter 77107321
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processor 10, local counter 77060207
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processor 11, local counter 77062079
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processor 12, local counter 77059638
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processor 13, local counter 77059931
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processor 14, local counter 77056750
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processor 15, local counter 77057813
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processor 16, local counter 76659137
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processor 17, local counter 76659205
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processor 18, local counter 76669140
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processor 19, local counter 76670415
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processor 20, local counter 76674221
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processor 21, local counter 76674630
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processor 22, local counter 76434805
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processor 23, local counter 76434361
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global counter 0, sum of local counter 1846208580
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local MCS lock with local counter
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processor 0, local counter 44963740
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processor 1, local counter 45045357
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processor 2, local counter 45023035
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processor 3, local counter 45021994
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processor 4, local counter 44912701
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processor 5, local counter 44951749
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processor 6, local counter 45090697
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processor 7, local counter 45089463
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processor 8, local counter 45015619
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processor 9, local counter 45088716
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processor 10, local counter 45064955
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processor 11, local counter 45063568
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processor 12, local counter 44966963
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processor 13, local counter 45002743
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processor 14, local counter 45127830
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processor 15, local counter 45126512
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processor 16, local counter 44947194
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processor 17, local counter 44992882
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processor 18, local counter 45006760
|
||||
processor 19, local counter 45005553
|
||||
processor 20, local counter 44880447
|
||||
processor 21, local counter 44889042
|
||||
processor 22, local counter 45036454
|
||||
processor 23, local counter 45036288
|
||||
global counter 0, sum of local counter 1080350262
|
||||
local ticket lock with global counter
|
||||
processor 0, local counter 3962116
|
||||
processor 1, local counter 3963441
|
||||
processor 2, local counter 3963482
|
||||
processor 3, local counter 3963367
|
||||
processor 4, local counter 3962978
|
||||
processor 5, local counter 3963102
|
||||
processor 6, local counter 3962979
|
||||
processor 7, local counter 3962911
|
||||
processor 8, local counter 3962974
|
||||
processor 9, local counter 3963125
|
||||
processor 10, local counter 3963056
|
||||
processor 11, local counter 3963093
|
||||
processor 12, local counter 3962996
|
||||
processor 13, local counter 3963100
|
||||
processor 14, local counter 3963096
|
||||
processor 15, local counter 3963028
|
||||
processor 16, local counter 3967076
|
||||
processor 17, local counter 3967251
|
||||
processor 18, local counter 3967222
|
||||
processor 19, local counter 3967093
|
||||
processor 20, local counter 3972862
|
||||
processor 21, local counter 3972917
|
||||
processor 22, local counter 3967217
|
||||
processor 23, local counter 3967220
|
||||
global counter 7095791, sum of local counter 95157702
|
||||
local MCS lock with global counter
|
||||
processor 0, local counter 3849478
|
||||
processor 1, local counter 3860113
|
||||
processor 2, local counter 3966891
|
||||
processor 3, local counter 3966750
|
||||
processor 4, local counter 3973618
|
||||
processor 5, local counter 4014013
|
||||
processor 6, local counter 3914674
|
||||
processor 7, local counter 3914601
|
||||
processor 8, local counter 3910536
|
||||
processor 9, local counter 3924908
|
||||
processor 10, local counter 3995362
|
||||
processor 11, local counter 3995130
|
||||
processor 12, local counter 3909912
|
||||
processor 13, local counter 3923977
|
||||
processor 14, local counter 3995941
|
||||
processor 15, local counter 3995667
|
||||
processor 16, local counter 3842753
|
||||
processor 17, local counter 3852728
|
||||
processor 18, local counter 3956029
|
||||
processor 19, local counter 3955977
|
||||
processor 20, local counter 3961870
|
||||
processor 21, local counter 4001067
|
||||
processor 22, local counter 3911767
|
||||
processor 23, local counter 3911724
|
||||
global counter 8503087, sum of local counter 94505486
|
||||
global ticket lock with busy section
|
||||
processor 0, local counter 614377
|
||||
processor 1, local counter 614376
|
||||
processor 2, local counter 614377
|
||||
processor 3, local counter 614377
|
||||
processor 4, local counter 614377
|
||||
processor 5, local counter 614378
|
||||
processor 6, local counter 614377
|
||||
processor 7, local counter 614377
|
||||
processor 8, local counter 614377
|
||||
processor 9, local counter 614376
|
||||
processor 10, local counter 614378
|
||||
processor 11, local counter 614377
|
||||
processor 12, local counter 614377
|
||||
processor 13, local counter 614377
|
||||
processor 14, local counter 614377
|
||||
processor 15, local counter 614376
|
||||
processor 16, local counter 614377
|
||||
processor 17, local counter 614377
|
||||
processor 18, local counter 614377
|
||||
processor 19, local counter 614378
|
||||
processor 20, local counter 614378
|
||||
processor 21, local counter 614377
|
||||
processor 22, local counter 614377
|
||||
processor 23, local counter 614377
|
||||
global counter 0, sum of local counter 14745049
|
||||
global MCS lock with busy section
|
||||
processor 0, local counter 552660
|
||||
processor 1, local counter 552661
|
||||
processor 2, local counter 552659
|
||||
processor 3, local counter 552659
|
||||
processor 4, local counter 552660
|
||||
processor 5, local counter 552659
|
||||
processor 6, local counter 552659
|
||||
processor 7, local counter 552660
|
||||
processor 8, local counter 552660
|
||||
processor 9, local counter 552660
|
||||
processor 10, local counter 552660
|
||||
processor 11, local counter 552659
|
||||
processor 12, local counter 552660
|
||||
processor 13, local counter 552659
|
||||
processor 14, local counter 552660
|
||||
processor 15, local counter 552661
|
||||
processor 16, local counter 552660
|
||||
processor 17, local counter 552659
|
||||
processor 18, local counter 552660
|
||||
processor 19, local counter 552661
|
||||
processor 20, local counter 552660
|
||||
processor 21, local counter 552661
|
||||
processor 22, local counter 552660
|
||||
processor 23, local counter 552661
|
||||
global counter 0, sum of local counter 13263838
|
||||
sequence lock
|
||||
processor 0, local counter 12138641
|
||||
processor 1, local counter 8
|
||||
processor 2, local counter 64
|
||||
processor 3, local counter 89
|
||||
processor 4, local counter 208
|
||||
processor 5, local counter 227
|
||||
processor 6, local counter 69
|
||||
processor 7, local counter 82
|
||||
processor 8, local counter 2019
|
||||
processor 9, local counter 2017
|
||||
processor 10, local counter 1914
|
||||
processor 11, local counter 2008
|
||||
processor 12, local counter 1890
|
||||
processor 13, local counter 1902
|
||||
processor 14, local counter 1734
|
||||
processor 15, local counter 1701
|
||||
processor 16, local counter 2198
|
||||
processor 17, local counter 2176
|
||||
processor 18, local counter 2011
|
||||
processor 19, local counter 2047
|
||||
processor 20, local counter 2072
|
||||
processor 21, local counter 2084
|
||||
processor 22, local counter 1866
|
||||
processor 23, local counter 1849
|
||||
global counter 0, sum of local counter 12170876
|
||||
*** END OF TEST SMPLOCK 1 ***
|
||||
|
||||
Reference in New Issue
Block a user