diff options
Diffstat (limited to 'cpukit/score/include/rtems/score/smplockticket.h')
| -rw-r--r-- | cpukit/score/include/rtems/score/smplockticket.h | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/cpukit/score/include/rtems/score/smplockticket.h b/cpukit/score/include/rtems/score/smplockticket.h deleted file mode 100644 index e04c4056a5..0000000000 --- a/cpukit/score/include/rtems/score/smplockticket.h +++ /dev/null @@ -1,187 +0,0 @@ -/** - * @file - * - * @ingroup ScoreSMPLock - * - * @brief SMP Lock API - */ - -/* - * Copyright (c) 2013, 2016 embedded brains GmbH - * - * 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. - */ - -#ifndef _RTEMS_SCORE_SMPLOCKTICKET_H -#define _RTEMS_SCORE_SMPLOCKTICKET_H - -#include <rtems/score/cpuopts.h> - -#if defined(RTEMS_SMP) - -#include <rtems/score/atomic.h> -#include <rtems/score/smplockstats.h> - -#ifdef __cplusplus -extern "C" { -#endif /* __cplusplus */ - -/** - * @addtogroup ScoreSMPLock - * - * @{ - */ - -/** - * @brief SMP ticket lock control. - */ -typedef struct { - Atomic_Uint next_ticket; - Atomic_Uint now_serving; -} SMP_ticket_lock_Control; - -/** - * @brief SMP ticket lock control initializer for static initialization. - */ -#define SMP_TICKET_LOCK_INITIALIZER \ - { \ - ATOMIC_INITIALIZER_UINT( 0U ), \ - ATOMIC_INITIALIZER_UINT( 0U ) \ - } - -/** - * @brief Initializes an SMP ticket lock. - * - * Concurrent initialization leads to unpredictable results. - * - * @param[in] lock The SMP ticket lock control. - */ -static inline void _SMP_ticket_lock_Initialize( - SMP_ticket_lock_Control *lock -) -{ - _Atomic_Init_uint( &lock->next_ticket, 0U ); - _Atomic_Init_uint( &lock->now_serving, 0U ); -} - -/** - * @brief Destroys an SMP ticket lock. - * - * Concurrent destruction leads to unpredictable results. - * - * @param[in] lock The SMP ticket lock control. - */ -static inline void _SMP_ticket_lock_Destroy( SMP_ticket_lock_Control *lock ) -{ - (void) lock; -} - -static inline void _SMP_ticket_lock_Do_acquire( - SMP_ticket_lock_Control *lock -#if defined(RTEMS_PROFILING) - , - SMP_lock_Stats *stats, - SMP_lock_Stats_context *stats_context -#endif -) -{ - unsigned int my_ticket; - unsigned int now_serving; -#if defined(RTEMS_PROFILING) - unsigned int initial_queue_length; - SMP_lock_Stats_acquire_context acquire_context; - - _SMP_lock_Stats_acquire_begin( &acquire_context ); -#endif - - my_ticket = - _Atomic_Fetch_add_uint( &lock->next_ticket, 1U, ATOMIC_ORDER_RELAXED ); - -#if defined(RTEMS_PROFILING) - now_serving = - _Atomic_Load_uint( &lock->now_serving, ATOMIC_ORDER_ACQUIRE ); - initial_queue_length = my_ticket - now_serving; - - if ( initial_queue_length > 0 ) { -#endif - - do { - now_serving = - _Atomic_Load_uint( &lock->now_serving, ATOMIC_ORDER_ACQUIRE ); - } while ( now_serving != my_ticket ); - -#if defined(RTEMS_PROFILING) - } - - _SMP_lock_Stats_acquire_end( - &acquire_context, - stats, - stats_context, - initial_queue_length - ); -#endif -} - -/** - * @brief Acquires an SMP ticket lock. - * - * This function will not disable interrupts. The caller must ensure that the - * current thread of execution is not interrupted indefinite once it obtained - * the SMP ticket lock. - * - * @param[in] lock The SMP ticket lock control. - * @param[in] stats The SMP lock statistics. - * @param[out] stats_context The SMP lock statistics context. - */ -#if defined(RTEMS_PROFILING) - #define _SMP_ticket_lock_Acquire( lock, stats, stats_context ) \ - _SMP_ticket_lock_Do_acquire( lock, stats, stats_context ) -#else - #define _SMP_ticket_lock_Acquire( lock, stats, stats_context ) \ - _SMP_ticket_lock_Do_acquire( lock ) -#endif - -static inline void _SMP_ticket_lock_Do_release( - SMP_ticket_lock_Control *lock -#if defined(RTEMS_PROFILING) - , - const SMP_lock_Stats_context *stats_context -#endif -) -{ - unsigned int current_ticket = - _Atomic_Load_uint( &lock->now_serving, ATOMIC_ORDER_RELAXED ); - unsigned int next_ticket = current_ticket + 1U; - -#if defined(RTEMS_PROFILING) - _SMP_lock_Stats_release_update( stats_context ); -#endif - - _Atomic_Store_uint( &lock->now_serving, next_ticket, ATOMIC_ORDER_RELEASE ); -} - -/** - * @brief Releases an SMP ticket lock. - * - * @param[in] lock The SMP ticket lock control. - * @param[in] stats_context The SMP lock statistics context. - */ -#if defined(RTEMS_PROFILING) - #define _SMP_ticket_lock_Release( lock, stats_context ) \ - _SMP_ticket_lock_Do_release( lock, stats_context ) -#else - #define _SMP_ticket_lock_Release( lock, stats_context ) \ - _SMP_ticket_lock_Do_release( lock ) -#endif - -/**@}*/ - -#ifdef __cplusplus -} -#endif /* __cplusplus */ - -#endif /* RTEMS_SMP */ - -#endif /* _RTEMS_SCORE_SMPLOCKTICKET_H */ |