From 1927da29ccbe1d4cc8e59ccfa197eb41c257814f Mon Sep 17 00:00:00 2001 From: Damjan Marion Date: Mon, 27 Mar 2017 17:08:20 +0200 Subject: vppinfra: add spinlock inline functions Change-Id: I86089e9bb604adfc260a111685001be1c897ce53 Signed-off-by: Damjan Marion --- src/vppinfra/lock.h | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) create mode 100644 src/vppinfra/lock.h (limited to 'src/vppinfra') diff --git a/src/vppinfra/lock.h b/src/vppinfra/lock.h new file mode 100644 index 00000000000..c60ff414612 --- /dev/null +++ b/src/vppinfra/lock.h @@ -0,0 +1,97 @@ +/* + * 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 + +typedef struct +{ + CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); + u32 lock; +#if CLIB_DEBUG > 0 + pid_t pid; + uword cpu_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)->cpu_index = os_get_cpu_number (); +#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) +{ + (*p)->lock = 0; +#if CLIB_DEBUG > 0 + (*p)->frame_address = 0; + (*p)->pid = 0; + (*p)->cpu_index = 0; +#endif +} + +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: + */ -- cgit 1.2.3-korg