1 #ifndef _LINUX_RING_BUFFER_VATOMIC_H
2 #define _LINUX_RING_BUFFER_VATOMIC_H
5 * linux/ringbuffer/vatomic.h
7 * Copyright (C) 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 * Dual LGPL v2.1/GPL v2 license.
13 #include <urcu/uatomic.h>
16 * Same data type (long) accessed differently depending on configuration.
17 * v field is for non-atomic access (protected by mutual exclusion).
18 * In the fast-path, the ring_buffer_config structure is constant, so the
19 * compiler can statically select the appropriate branch.
20 * local_t is used for per-cpu and per-thread buffers.
21 * atomic_long_t is used for globally shared buffers.
24 long a
; /* accessed through uatomic */
29 long v_read(const struct lib_ring_buffer_config
*config
, union v_atomic
*v_a
)
31 assert(config
->sync
!= RING_BUFFER_SYNC_PER_CPU
);
32 return uatomic_read(&v_a
->a
);
36 void v_set(const struct lib_ring_buffer_config
*config
, union v_atomic
*v_a
,
39 assert(config
->sync
!= RING_BUFFER_SYNC_PER_CPU
);
40 uatomic_set(&v_a
->a
, v
);
44 void v_add(const struct lib_ring_buffer_config
*config
, long v
, union v_atomic
*v_a
)
46 assert(config
->sync
!= RING_BUFFER_SYNC_PER_CPU
);
47 uatomic_add(&v_a
->a
, v
);
51 void v_inc(const struct lib_ring_buffer_config
*config
, union v_atomic
*v_a
)
53 assert(config
->sync
!= RING_BUFFER_SYNC_PER_CPU
);
58 * Non-atomic decrement. Only used by reader, apply to reader-owned subbuffer.
61 void _v_dec(const struct lib_ring_buffer_config
*config
, union v_atomic
*v_a
)
67 long v_cmpxchg(const struct lib_ring_buffer_config
*config
, union v_atomic
*v_a
,
70 assert(config
->sync
!= RING_BUFFER_SYNC_PER_CPU
);
71 return uatomic_cmpxchg(&v_a
->a
, old
, _new
);
74 #endif /* _LINUX_RING_BUFFER_VATOMIC_H */
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