17 #ifndef _RTEMS_SCORE_SMPLOCKTICKET_H 18 #define _RTEMS_SCORE_SMPLOCKTICKET_H 20 #include <rtems/score/cpuopts.h> 22 #if defined(RTEMS_SMP) 41 Atomic_Uint next_ticket;
42 Atomic_Uint now_serving;
48 #define SMP_TICKET_LOCK_INITIALIZER \ 50 ATOMIC_INITIALIZER_UINT( 0U ), \ 51 ATOMIC_INITIALIZER_UINT( 0U ) \ 65 _Atomic_Init_uint( &lock->next_ticket, 0U );
66 _Atomic_Init_uint( &lock->now_serving, 0U );
90 #
if defined(RTEMS_PROFILING)
92 SMP_lock_Stats *stats,
93 SMP_lock_Stats_context *stats_context
97 unsigned int my_ticket;
98 unsigned int now_serving;
99 #if defined(RTEMS_PROFILING) 100 unsigned int initial_queue_length;
101 SMP_lock_Stats_acquire_context acquire_context;
103 _SMP_lock_Stats_acquire_begin( &acquire_context );
107 _Atomic_Fetch_add_uint( &lock->next_ticket, 1U, ATOMIC_ORDER_RELAXED );
109 #if defined(RTEMS_PROFILING) 111 _Atomic_Load_uint( &lock->now_serving, ATOMIC_ORDER_ACQUIRE );
112 initial_queue_length = my_ticket - now_serving;
114 if ( initial_queue_length > 0 ) {
119 _Atomic_Load_uint( &lock->now_serving, ATOMIC_ORDER_ACQUIRE );
120 }
while ( now_serving != my_ticket );
122 #if defined(RTEMS_PROFILING) 125 _SMP_lock_Stats_acquire_end(
145 #if defined(RTEMS_PROFILING) 146 #define _SMP_ticket_lock_Acquire( lock, stats, stats_context ) \ 147 _SMP_ticket_lock_Do_acquire( lock, stats, stats_context ) 149 #define _SMP_ticket_lock_Acquire( lock, stats, stats_context ) \ 150 _SMP_ticket_lock_Do_acquire( lock ) 161 #
if defined(RTEMS_PROFILING)
163 const SMP_lock_Stats_context *stats_context
167 unsigned int current_ticket =
168 _Atomic_Load_uint( &lock->now_serving, ATOMIC_ORDER_RELAXED );
169 unsigned int next_ticket = current_ticket + 1U;
171 #if defined(RTEMS_PROFILING) 172 _SMP_lock_Stats_release_update( stats_context );
175 _Atomic_Store_uint( &lock->now_serving, next_ticket, ATOMIC_ORDER_RELEASE );
184 #if defined(RTEMS_PROFILING) 185 #define _SMP_ticket_lock_Release( lock, stats_context ) \ 186 _SMP_ticket_lock_Do_release( lock, stats_context ) 188 #define _SMP_ticket_lock_Release( lock, stats_context ) \ 189 _SMP_ticket_lock_Do_release( lock ) static void _SMP_ticket_lock_Do_release(SMP_ticket_lock_Control *lock)
Releases the SMP ticket lock.
static void _SMP_ticket_lock_Initialize(SMP_ticket_lock_Control *lock)
Initializes the SMP ticket lock.
static void _SMP_ticket_lock_Do_acquire(SMP_ticket_lock_Control *lock)
Acquires the SMP ticket lock.
static void _SMP_ticket_lock_Destroy(SMP_ticket_lock_Control *lock)
Destroys the SMP ticket lock.