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/*
* RTLinux POSIX spinlock implementation
*
* Written by Michael Barabanov
* Copyright (C) Finite State Machine Labs Inc., 1999
* Released under the terms of the GPL Version 2
*
*/
#ifndef __RTL_SPINLOCK_H__
#define __RTL_SPINLOCK_H__
#include <rtl_sync.h>
#include <linux/errno.h>
typedef struct {
spinlock_t lock;
rtl_irqstate_t flags;
} pthread_spinlock_t;
#define PTHREAD_SPINLOCK_INITIALIZER { SPIN_LOCK_UNLOCKED, 0 }
static inline int pthread_spin_init(pthread_spinlock_t *lock, int pshared)
{
spin_lock_init(&lock->lock);
return 0;
}
static inline int pthread_spin_destroy(pthread_spinlock_t *lock)
{
return 0;
}
static inline int pthread_spin_lock(pthread_spinlock_t *lock)
{
rtl_irqstate_t flags;
rtl_no_interrupts (flags);
spin_lock (&lock->lock);
lock->flags = flags;
return 0;
}
static inline int pthread_spin_trylock(pthread_spinlock_t *lock)
{
rtl_irqstate_t flags;
rtl_no_interrupts (flags);
if (rtl_spin_trylock(&lock->lock)) {
rtl_restore_interrupts (flags);
return EBUSY;
} else {
lock->flags = flags;
return 0;
}
}
static inline int pthread_spin_unlock(pthread_spinlock_t *lock)
{
rtl_irqstate_t flags;
flags = lock->flags;
rtl_spin_unlock(&lock->lock);
rtl_restore_interrupts (flags);
return 0;
}
#endif
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