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75 lines
3.0 KiB
C
75 lines
3.0 KiB
C
/*
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* FILE: utils/ring_buffer.h
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* AUTHORS: Martin Benes <martinbenesh@gmail.com>
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* Lukas Hejtmanek <xhejtman@ics.muni.cz>
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* Petr Holub <hopet@ics.muni.cz>
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* Milos Liska <xliska@fi.muni.cz>
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* Jiri Matela <matela@ics.muni.cz>
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* Dalibor Matura <255899@mail.muni.cz>
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* Ian Wesley-Smith <iwsmith@cct.lsu.edu>
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*
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* Copyright (c) 2005-2010 CESNET z.s.p.o.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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*
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* This product includes software developed by CESNET z.s.p.o.
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*
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* 4. Neither the name of the CESNET nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* Provides abstraction for ring buffers.
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* Note that it doesn't offer advanced synchronization primitives and
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* therefore is mainly intended for one producer and one consumer.
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*/
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#ifndef __RING_BUFFER_H
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#define __RING_BUFFER_H
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struct ring_buffer;
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typedef struct ring_buffer ring_buffer_t;
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struct ring_buffer *ring_buffer_init(int size);
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void ring_buffer_destroy(struct ring_buffer * ring);
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/*
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* @param ring ring buffer structure
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* @param out allocated buffer to read to
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* @param max_len maximal amount of data
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* @return actual data length read (ranges between 0 and max_len)
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*/
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int ring_buffer_read(struct ring_buffer * ring, char *out, int max_len);
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void ring_buffer_write(struct ring_buffer * ring, const char *in, int len);
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int ring_get_size(struct ring_buffer * ring);
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int ring_get_current_size(struct ring_buffer * ring);
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#endif /* __RING_BUFFER_H */
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