44 lines
2.3 KiB
C
44 lines
2.3 KiB
C
/*
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* ringbuffer.h
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*
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* Created on: Apr 1, 2011
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* Author: sears
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*/
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#ifndef RINGBUFFER_H_
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#define RINGBUFFER_H_
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#include <stasis/common.h>
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BEGIN_C_DECLS
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typedef struct stasis_ringbuffer_t stasis_ringbuffer_t;
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stasis_ringbuffer_t * stasis_ringbuffer_init(intptr_t size, lsn_t initial_offset);
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lsn_t stasis_ringbuffer_nb_reserve_space(stasis_ringbuffer_t * ring, lsn_t sz);
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lsn_t stasis_ringbuffer_reserve_space(stasis_ringbuffer_t * ring, lsn_t sz, lsn_t * handle);
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void stasis_ringbuffer_read_done(stasis_ringbuffer_t * ring, lsn_t * handle);
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void stasis_ringbuffer_advance_write_tail(stasis_ringbuffer_t * ring, lsn_t off);
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void stasis_ringbuffer_reading_writer_done(stasis_ringbuffer_t * ring, lsn_t * handle);
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const void * stasis_ringbuffer_nb_get_rd_buf(stasis_ringbuffer_t * ring, lsn_t off, lsn_t sz);
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// sz is a pointer to the desired size, or RING_NEXT for "as many bytes as possible"
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lsn_t stasis_ringbuffer_consume_bytes(stasis_ringbuffer_t * ring, lsn_t* sz, lsn_t * handle);
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void stasis_ringbuffer_write_done(stasis_ringbuffer_t * ring, lsn_t * handle);
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// sz is a pointer to the desired size, or RING_NEXT for "as many bytes as possible"
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const void * stasis_ringbuffer_get_rd_buf(stasis_ringbuffer_t * ring, lsn_t off, lsn_t sz);
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void * stasis_ringbuffer_get_wr_buf(stasis_ringbuffer_t * ring, lsn_t off, lsn_t sz);
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lsn_t stasis_ringbuffer_get_read_tail(stasis_ringbuffer_t * ring);
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lsn_t stasis_ringbuffer_get_write_tail(stasis_ringbuffer_t * ring);
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lsn_t stasis_ringbuffer_get_write_frontier(stasis_ringbuffer_t * ring);
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void stasis_ringbuffer_advance_read_tail(stasis_ringbuffer_t * ring, lsn_t off);
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typedef enum { RING_TORN = -1, RING_VOLATILE = -2, RING_FULL = -3, RING_TRUNCATED = -4, RING_NEXT = -5, RING_CLOSED = -6, RING_MINERR = -7 } stasis_ringbuffer_error_t;
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void stasis_ringbuffer_flush(stasis_ringbuffer_t * ring, lsn_t off);
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/*
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* Like flush, but if off could still be modified, immediately returns RING_VOLATILE instead of flushing the ringbuffer.
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*/
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int stasis_ringbuffer_tryflush(stasis_ringbuffer_t * ring, lsn_t off);
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// Causes ringbuffer requests to stop blocking, and return RING_CLOSED
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void stasis_ringbuffer_shutdown(stasis_ringbuffer_t * ring);
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// Deallocates the ringbuffer (call after any threads using the ringbuffer have shutdown).
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void stasis_ringbuffer_free(stasis_ringbuffer_t * ring);
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END_C_DECLS
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#endif /* RINGBUFFER_H_ */
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