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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* 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.
*/
#ifndef included_clib_lock_h
#define included_clib_lock_h
#include <vppinfra/clib.h>
typedef struct
{
CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
u32 lock;
#if CLIB_DEBUG > 0
pid_t pid;
uword thread_index;
void *frame_address;
#endif
} *clib_spinlock_t;
static inline void
clib_spinlock_init (clib_spinlock_t * p)
{
*p = clib_mem_alloc_aligned (CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES);
memset ((void *) *p, 0, CLIB_CACHE_LINE_BYTES);
}
static inline void
clib_spinlock_free (clib_spinlock_t * p)
{
if (*p)
{
clib_mem_free ((void *) *p);
*p = 0;
}
}
static_always_inline void
clib_spinlock_lock (clib_spinlock_t * p)
{
while (__sync_lock_test_and_set (&(*p)->lock, 1))
#if __x86_64__
__builtin_ia32_pause ()
#endif
;
#if CLIB_DEBUG > 0
(*p)->frame_address = __builtin_frame_address (0);
(*p)->pid = getpid ();
(*p)->thread_index = os_get_thread_index ();
#endif
}
static_always_inline void
clib_spinlock_lock_if_init (clib_spinlock_t * p)
{
if (PREDICT_FALSE (*p != 0))
clib_spinlock_lock (p);
}
static_always_inline void
clib_spinlock_unlock (clib_spinlock_t * p)
{
#if CLIB_DEBUG > 0
(*p)->frame_address = 0;
(*p)->pid = 0;
(*p)->thread_index = 0;
#endif
/* Make sure all writes are complete before releasing the lock */
CLIB_MEMORY_BARRIER ();
(*p)->lock = 0;
}
static_always_inline void
clib_spinlock_unlock_if_init (clib_spinlock_t * p)
{
if (PREDICT_FALSE (*p != 0))
clib_spinlock_unlock (p);
}
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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