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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2010-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
* Description: Optimized fallbacks used when native ops are missing
* Author: Rickard Green
*/
#ifndef ETHR_OPTIMIZED_FALLBACKS_H__
#define ETHR_OPTIMIZED_FALLBACKS_H__
#if defined(ETHR_HAVE_NATIVE_SPINLOCKS)
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_AUX_IMPL__)
static ETHR_INLINE int
ethr_native_spinlock_destroy(ethr_native_spinlock_t *lock)
{
return 0;
}
#endif
#elif defined(ETHR_HAVE_PTHREAD_SPIN_LOCK)
/* --- Native spinlocks using pthread spinlocks -------------------------- */
#define ETHR_HAVE_NATIVE_SPINLOCKS 1
#define ETHR_NATIVE_SPINLOCK_IMPL "pthread"
typedef pthread_spinlock_t ethr_native_spinlock_t;
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_AUX_IMPL__)
static ETHR_INLINE void
ethr_native_spinlock_init(ethr_native_spinlock_t *lock)
{
int err = pthread_spin_init((pthread_spinlock_t *) lock, 0);
if (err)
ETHR_FATAL_ERROR__(err);
}
static ETHR_INLINE int
ethr_native_spinlock_destroy(ethr_native_spinlock_t *lock)
{
return pthread_spin_destroy((pthread_spinlock_t *) lock);
}
static ETHR_INLINE void
ethr_native_spin_unlock(ethr_native_spinlock_t *lock)
{
int err = pthread_spin_unlock((pthread_spinlock_t *) lock);
if (err)
ETHR_FATAL_ERROR__(err);
}
static ETHR_INLINE void
ethr_native_spin_lock(ethr_native_spinlock_t *lock)
{
int err = pthread_spin_lock((pthread_spinlock_t *) lock);
if (err)
ETHR_FATAL_ERROR__(err);
}
#endif
#elif defined(ETHR_HAVE_32BIT_NATIVE_ATOMIC_OPS)
/* --- Native spinlocks using native atomics -------------------------------- */
#define ETHR_HAVE_NATIVE_SPINLOCKS 1
#define ETHR_NATIVE_SPINLOCK_IMPL "native-atomics"
typedef ethr_atomic32_t ethr_native_spinlock_t;
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_AUX_IMPL__)
#undef ETHR_NSPN_AOP__
#define ETHR_NSPN_AOP__(X) ETHR_INLINE_ATMC32_FUNC_NAME_(ethr_atomic32_ ## X)
static ETHR_INLINE void
ethr_native_spinlock_init(ethr_native_spinlock_t *lock)
{
ETHR_NSPN_AOP__(init)(lock, 0);
}
static ETHR_INLINE int
ethr_native_spinlock_destroy(ethr_native_spinlock_t *lock)
{
return ETHR_NSPN_AOP__(read)(lock) == 0 ? 0 : EBUSY;
}
static ETHR_INLINE void
ethr_native_spin_unlock(ethr_native_spinlock_t *lock)
{
ETHR_ASSERT(ETHR_NSPN_AOP__(read)(lock) == 1);
ETHR_NSPN_AOP__(set_relb)(lock, 0);
}
static ETHR_INLINE void
ethr_native_spin_lock(ethr_native_spinlock_t *lock)
{
while (ETHR_NSPN_AOP__(cmpxchg_acqb)(lock, 1, 0) != 0) {
while (ETHR_NSPN_AOP__(read)(lock) != 0)
ETHR_SPIN_BODY;
}
ETHR_COMPILER_BARRIER;
}
#undef ETHR_NSPN_AOP__
#endif
#endif
#if defined(ETHR_HAVE_NATIVE_RWSPINLOCKS)
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_AUX_IMPL__)
static ETHR_INLINE int
ethr_native_rwlock_destroy(ethr_native_rwlock_t *lock)
{
return 0;
}
#endif
#elif defined(ETHR_HAVE_32BIT_NATIVE_ATOMIC_OPS)
/* --- Native rwspinlocks using native atomics ------------------------------ */
#define ETHR_HAVE_NATIVE_RWSPINLOCKS 1
#define ETHR_NATIVE_RWSPINLOCK_IMPL "native-atomics"
typedef ethr_atomic32_t ethr_native_rwlock_t;
# define ETHR_WLOCK_FLAG__ (((ethr_sint32_t) 1) << 30)
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_AUX_IMPL__)
#undef ETHR_NRWSPN_AOP__
#define ETHR_NRWSPN_AOP__(X) ETHR_INLINE_ATMC32_FUNC_NAME_(ethr_atomic32_ ## X)
static ETHR_INLINE void
ethr_native_rwlock_init(ethr_native_rwlock_t *lock)
{
ETHR_NRWSPN_AOP__(init)(lock, 0);
}
static ETHR_INLINE int
ethr_native_rwlock_destroy(ethr_native_rwlock_t *lock)
{
return ETHR_NRWSPN_AOP__(read)(lock) == 0 ? 0 : EBUSY;
}
static ETHR_INLINE void
ethr_native_read_unlock(ethr_native_rwlock_t *lock)
{
ETHR_ASSERT(ETHR_NRWSPN_AOP__(read)(lock) >= 0);
ETHR_NRWSPN_AOP__(dec_relb)(lock);
}
static ETHR_INLINE void
ethr_native_read_lock(ethr_native_rwlock_t *lock)
{
ethr_sint32_t act, exp = 0;
while (1) {
act = ETHR_NRWSPN_AOP__(cmpxchg_acqb)(lock, exp+1, exp);
if (act == exp)
break;
/* Wait for writer to leave */
while (act & ETHR_WLOCK_FLAG__) {
ETHR_SPIN_BODY;
act = ETHR_NRWSPN_AOP__(read)(lock);
}
exp = act;
}
ETHR_COMPILER_BARRIER;
}
static ETHR_INLINE void
ethr_native_write_unlock(ethr_native_rwlock_t *lock)
{
ETHR_ASSERT(ETHR_NRWSPN_AOP__(read)(lock) == ETHR_WLOCK_FLAG__);
ETHR_NRWSPN_AOP__(set_relb)(lock, 0);
}
static ETHR_INLINE void
ethr_native_write_lock(ethr_native_rwlock_t *lock)
{
ethr_sint32_t act, exp = 0;
while (1) {
act = ETHR_NRWSPN_AOP__(cmpxchg_acqb)(lock, exp|ETHR_WLOCK_FLAG__, exp);
if (act == exp)
break;
/* Wait for writer to leave */
while (act & ETHR_WLOCK_FLAG__) {
ETHR_SPIN_BODY;
act = ETHR_NRWSPN_AOP__(read)(lock);
}
exp = act;
}
act |= ETHR_WLOCK_FLAG__;
/* Wait for readers to leave */
while (act != ETHR_WLOCK_FLAG__) {
ETHR_SPIN_BODY;
act = ETHR_NRWSPN_AOP__(read_acqb)(lock);
}
ETHR_COMPILER_BARRIER;
}
#undef ETHR_NRWSPN_AOP__
#endif
#endif
#endif
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