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lib: add atomic bitwise OR, AND

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* Add support for C11 bitwise OR & AND operations
* Add atomic versions of bitfield macros

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
This commit is contained in:
Quentin Young 2018-02-28 16:11:42 -05:00
parent 85121506e7
commit f765d422d1
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GPG Key ID: DAF48E0F57E0834F
2 changed files with 26 additions and 0 deletions
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16
lib/frratomic.h
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@ -46,6 +46,8 @@
#define atomic_exchange_explicit __atomic_exchange_n
#define atomic_fetch_add_explicit __atomic_fetch_add
#define atomic_fetch_sub_explicit __atomic_fetch_sub
#define atomic_fetch_and_explicit __atomic_fetch_and
#define atomic_fetch_or_explicit __atomic_fetch_or
#define atomic_compare_exchange_weak_explicit(atom, expect, desire, mem1, \
mem2) \
@ -135,6 +137,20 @@
*_expect = rval; \
ret; \
})
#define atomic_fetch_and_explicit(ptr, val, mem) \
({ \
__sync_synchronize(); \
typeof(*ptr) rval = __sync_fetch_and_and(ptr, val); \
__sync_synchronize(); \
rval; \
})
#define atomic_fetch_or_explicit(ptr, val, mem) \
({ \
__sync_synchronize(); \
typeof(*ptr) rval = __sync_fetch_and_or(ptr, val); \
__sync_synchronize(); \
rval; \
})
#else /* !HAVE___ATOMIC && !HAVE_STDATOMIC_H */
#error no atomic functions...

10
lib/zebra.h
View File

@ -481,6 +481,16 @@ typedef enum {
#define UNSET_FLAG(V,F) (V) &= ~(F)
#define RESET_FLAG(V) (V) = 0
/* Atomic flag manipulation macros. */
#define CHECK_FLAG_ATOMIC(PV, F) \
((atomic_load_explicit(PV, memory_order_seq_cst)) & (F))
#define SET_FLAG_ATOMIC(PV, F) \
((atomic_fetch_or_explicit(PV, (F), memory_order_seq_cst)))
#define UNSET_FLAG_ATOMIC(PV, F) \
((atomic_fetch_and_explicit(PV, ~(F), memory_order_seq_cst)))
#define RESET_FLAG_ATOMIC(PV) \
((atomic_store_explicit(PV, 0, memory_order_seq_cst)))
/* Zebra types. Used in Zserv message header. */
typedef u_int16_t zebra_size_t;
typedef u_int16_t zebra_command_t;