Messages in this thread Patch in this message | | | Subject | [PATCH 5/7] new kfifo API | From | Stefani Seibold <> | Date | Wed, 12 Aug 2009 00:32:00 +0200 |
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kfifo.h | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+)
Signed-off-by: Stefani Seibold <stefani@seibold.net>
diff -u -N -r linux-2.6.31-rc4-kfifo4/include/linux/kfifo.h linux-2.6.31-rc4-kfifo5/include/linux/kfifo.h --- linux-2.6.31-rc4-kfifo4/include/linux/kfifo.h 2009-08-11 22:14:19.000000000 +0200 +++ linux-2.6.31-rc4-kfifo5/include/linux/kfifo.h 2009-08-11 22:53:29.000000000 +0200 @@ -32,6 +32,28 @@ unsigned int out; /* data is extracted from off. (out % size) */ }; +#define KFIFO_INIT(s, b) \ + (struct kfifo) { \ + .size = s, \ + .in = 0, \ + .out = 0, \ + .buffer = b \ + } + + +#define DECLARE_KFIFO(name, size) \ +union { \ + struct kfifo name; \ + unsigned char name##_buffer[size + sizeof(struct kfifo)]; \ +} + +#define DEFINE_KFIFO(name, size) \ + DECLARE_KFIFO(name, size) = KFIFO_INIT(name, size) + +#define INIT_KFIFO(name) \ + name = KFIFO_INIT(sizeof(name##_buffer) - sizeof(struct kfifo), \ + name##_buffer) + extern void kfifo_init(struct kfifo *fifo, unsigned char *buffer, unsigned int size); extern __must_check int kfifo_alloc(struct kfifo *fifo, @@ -52,6 +74,24 @@ } /** + * kfifo_reset_in - skip input FIFO contents + * @fifo: the fifo to be emptied. + */ +static inline void kfifo_reset_in(struct kfifo *fifo) +{ + fifo->in = fifo->out; +} + +/** + * kfifo_reset_in - skip output FIFO contents + * @fifo: the fifo to be emptied. + */ +static inline void kfifo_reset_out(struct kfifo *fifo) +{ + fifo->out = fifo->in; +} + +/** * kfifo_in_locked - puts some data into the FIFO using a spinlock for locking * @fifo: the fifo to be used. * @buffer: the data to be added. @@ -122,4 +162,40 @@ return fifo->in - out; } +/** + * kfifo_size - returns the size of the fifo in bytes + * @fifo: the fifo to be used. + */ +static inline __must_check unsigned int kfifo_size(struct kfifo *fifo) +{ + return fifo->size; +} + +/** + * kfifo_is_empty - returns true if the fifo is empty + * @fifo: the fifo to be used. + */ +static inline __must_check int kfifo_is_empty(struct kfifo *fifo) +{ + return fifo->in == fifo->out; +} + +/** + * kfifo_is_full - returns true if the fifo is full + * @fifo: the fifo to be used. + */ +static inline __must_check int kfifo_is_full(struct kfifo *fifo) +{ + return kfifo_len(fifo) == kfifo_size(fifo); +} + +/** + * kfifo_avail - returns the number of bytes available in the FIFO + * @fifo: the fifo to be used. + */ +static inline __must_check unsigned int kfifo_avail(struct kfifo *fifo) +{ + return kfifo_size(fifo) - kfifo_len(fifo); +} + #endif
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