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/*
* Copyright (c) 2019 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.
*/
/** @file
* @brief Callback multiplex scheme
* For a fully worked-out example, see .../src/vlib/main.[ch] and
* .../src/plugins/perfmon.c
*/
#ifndef included_callback_h
#define included_callback_h
#include <vppinfra/clib.h>
/** @brief Add or remove a callback to the specified callback set
* @param h head of the callback vector
* @param tmp vector to build result
* @param l clib_spinlock_t lock to protect the vector, may be 0
* @param f function to add or remove
* @param enable 1 adds f to the vector, 0 removes f from the vector
*
* Add or remove a callback from the indicated callback vector.
* Caller must provide locking to prevent > 1 concurrent writer
* Swaps the head of the callback vector and a tmp vector in one
* motion, after a write barrier to ensure that the write is atomic.
*/
#define clib_callback_enable_disable(h,tmp,l,f,enable) \
do { \
void *tmp2; \
clib_spinlock_lock_if_init(&l); \
vec_reset_length(tmp); \
vec_append(tmp, h); \
if (enable) \
vec_add1 (tmp,(void *)f); \
else \
{ \
int i; \
for (i = 0; i < vec_len (tmp); i++) \
if (((void *)tmp[i]) == (void *)f) \
{ \
vec_delete (tmp, 1, i); \
break; \
} \
} \
tmp2 = h; \
CLIB_MEMORY_STORE_BARRIER(); \
h = tmp; \
tmp = tmp2; \
clib_spinlock_unlock_if_init(&l); \
} while(0);
/** @brief call the specified callback set
* @param h the callback set
* @param varargs additional callback parameters
*/
#define clib_call_callbacks(h, ... ) \
do { \
/* \
* Note: fp exists to shut up gcc-6, which \
* produces a warning not seen with gcc-7 or 8 \
*/ \
typeof (h) h_ = (h); \
int i; \
for (i = 0; i < vec_len (h_); i++) \
{ \
(h_[i]) (__VA_ARGS__); \
} \
} while (0);
/** @brief predicate function says whether the specified function is enabled
* @param h the callback set
* @param l clib_spinlock_t lock to protect the vector, may be 0
* @param f the function to search for
* @return 1 if the function is enabled, 0 if not
*/
#define clib_callback_is_set(h,l,f) \
({ \
int _i; \
int _found = 0; \
clib_spinlock_lock_if_init(&l); \
for (_i = 0; _i < vec_len (h); _i++) \
if (((void *)h[_i]) == (void *) f) \
{ \
_found=1; \
break; \
} \
clib_spinlock_unlock_if_init(&l); \
_found; \
})
#endif /* included_callback_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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