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/**
* @file
*
* @brief Wait at a Spinlock
* @ingroup POSIXAPI
*/
/*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* Copyright (c) 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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/posix/spinlockimpl.h>
#if defined(POSIX_SPINLOCKS_ARE_SELF_CONTAINED)
RTEMS_STATIC_ASSERT(
#if defined(RTEMS_SMP)
offsetof( POSIX_Spinlock_Control, Lock.next_ticket )
#else
offsetof( POSIX_Spinlock_Control, reserved[ 0 ] )
#endif
== offsetof( pthread_spinlock_t, _Lock._next_ticket ),
POSIX_SPINLOCK_T_LOCK_NEXT_TICKET
);
RTEMS_STATIC_ASSERT(
#if defined(RTEMS_SMP)
offsetof( POSIX_Spinlock_Control, Lock.now_serving )
#else
offsetof( POSIX_Spinlock_Control, reserved[ 1 ] )
#endif
== offsetof( pthread_spinlock_t, _Lock._now_serving ),
POSIX_SPINLOCK_T_LOCK_NOW_SERVING
);
RTEMS_STATIC_ASSERT(
offsetof( POSIX_Spinlock_Control, interrupt_state )
== offsetof( pthread_spinlock_t, _interrupt_state ),
POSIX_SPINLOCK_T_INTERRUPT_STATE
);
RTEMS_STATIC_ASSERT(
sizeof( POSIX_Spinlock_Control ) == sizeof( pthread_spinlock_t ),
POSIX_SPINLOCK_T_SIZE
);
#else
#if defined(RTEMS_SMP)
POSIX_Spinlock_Control _POSIX_Spinlock_Global;
uint32_t _POSIX_Spinlock_Owner = 0xffffffff;
#endif
int _POSIX_Spinlock_Nest_level;
#endif
int pthread_spin_lock( pthread_spinlock_t *spinlock )
{
POSIX_Spinlock_Control *the_spinlock;
ISR_Level level;
#if defined(RTEMS_SMP) && defined(RTEMS_PROFILING)
Per_CPU_Control *cpu_self;
#endif
the_spinlock = _POSIX_Spinlock_Get( spinlock );
_ISR_Local_disable( level );
#if defined(POSIX_SPINLOCKS_ARE_SELF_CONTAINED)
#if defined(RTEMS_SMP)
#if defined(RTEMS_PROFILING)
/* The lock statistics are incorrect in case of nested pthread spinlocks */
cpu_self = _Per_CPU_Get();
#endif
_SMP_ticket_lock_Acquire(
&the_spinlock->Lock,
&cpu_self->Lock_stats,
&cpu_self->Lock_stats_context
);
#endif
the_spinlock->interrupt_state = level;
#else
#if defined(RTEMS_SMP)
if ( _POSIX_Spinlock_Owner != _SMP_Get_current_processor() ) {
#if defined(RTEMS_PROFILING)
cpu_self = _Per_CPU_Get();
#endif
_SMP_ticket_lock_Acquire(
&the_spinlock->Lock,
&cpu_self->Lock_stats,
&cpu_self->Lock_stats_context
);
_POSIX_Spinlock_Owner = _SMP_Get_current_processor();
}
#endif
if ( ++_POSIX_Spinlock_Nest_level == 1) {
the_spinlock->interrupt_state = level;
}
#endif
return 0;
}
int pthread_spin_trylock( pthread_spinlock_t *spinlock )
RTEMS_ALIAS( pthread_spin_lock );
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