source: trunk/src/testing/app/bitplay/bpio.h @ 4

Revision 4, 4.7 KB checked in by ajaworski, 13 years ago (diff)

Added modified SAGE sources
Line 
1/******************************************************************************
2 * SAGE - Scalable Adaptive Graphics Environment
3 *
4 * Copyright (C) 2004 Electronic Visualization Laboratory,
5 * University of Illinois at Chicago
6 *
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 *  * Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *  * Redistributions in binary form must reproduce the above
15 *    copyright notice, this list of conditions and the following disclaimer
16 *    in the documentation and/or other materials provided with the distribution.
17 *  * Neither the name of the University of Illinois at Chicago nor
18 *    the names of its contributors may be used to endorse or promote
19 *    products derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 * Direct questions, comments etc about SAGE to http://www.evl.uic.edu/cavern/forum/
34 *
35 *****************************************************************************/
36
37#ifndef BPIO_H
38#define BPIO_H 1
39
40#define _FILE_OFFSET_BITS  64
41
42#include <stdio.h>
43#include <unistd.h>
44#include <fcntl.h>
45#include <pthread.h>
46
47typedef struct bpbuf_s bpbuf_t;
48
49typedef struct bpio_s {
50    int nfillers;       /* readers read from disk -> bufs */
51    bpbuf_t *bpb;       /* bpb[reader(0..nfillers-1)] */
52    int bufsize;        /* matching that of bpb->bufsize */
53    int readsize;       /* ditto */
54    int drain;          /* next bpbuf_t to drain (dynamic, but owned by drain thread) */
55    int fwd;            /* bpb->incrpos = fwd * nfillers * bufsize */
56
57} bpio_t;
58
59/* Is someone waiting on our condition-variable?  Why? */
60enum business { NO, EMPTY, FULL, PAUSED };
61
62struct bpbuf_s {
63                /* Static stuff */
64    bpio_t        *bpio;
65    int           nbufs;        /* number of buffers per reader */
66    int           bufsize;
67    int           readsize;
68    unsigned char *bufspace;
69    unsigned char **bufs;       /* page-aligned buffers  bufs[0..nbufs-1] */
70    int           bpbno;        /* our index in parent */
71    int           fd;           /* file descriptor */
72
73    volatile off_t *curpos;     /* curpos[0..nbufs-1] -- filepos whence read */
74    volatile off_t wrappos;     /* wrap back to poswrap after passing EOF */
75    volatile off_t eofpos;      /* here's the nominal EOF point */
76    volatile off_t incrpos;     /* increment from one read to the next */
77    volatile int  doloop;       /* automatically loop at EOF? */
78
79                /* Dynamic stuff, held under locks */
80    volatile int     fillwaiting; /* is filler waiting? */
81    volatile int     drainwaiting; /* is drainer waiting? */
82    volatile int     filling;   /* is filler thread supposed to be running? */
83    volatile int     busy;      /* is filler busy reading? (if "filling" was cleared, has it noticed?) */
84
85    volatile off_t      filepos;/* file offset for next buffer to be filled*/
86    volatile int        wp;     /* next-buffer-to-be-drained (to display) index */
87    volatile int        rp;     /* next-buffer-to-be-filled (from file) index */
88
89    pthread_t        bthread;
90    pthread_mutex_t  bmut;
91    pthread_cond_t   bfillwait; /* filler waiting (due to not-yet-setup or full queue)? */
92    pthread_cond_t   bdrainwait; /* drainer wait (due to empty queue)? */
93
94};
95
96extern void bpclose( bpio_t *bpio );
97extern int bpopen( bpio_t *bpio, char *fname );
98extern int bpbfull( bpbuf_t *bpb );
99extern int bpbempty( bpbuf_t *bpb );
100extern bpio_t *bpinit( bpio_t *bpio, int nfillers, int bufsize, int readsize, int nbufseach );
101extern void bpseek( bpio_t *bpio, off_t pos );
102extern unsigned char *bpcurbuf( bpio_t *bpio );
103extern off_t bptell( bpio_t *bpio );
104extern void bpstart( bpio_t *bpio, int wrap );
105extern void bpstop( bpio_t *bpio );
106extern void bpforward( bpio_t *bpio, int fwd );
107extern void bprange( bpio_t *bpio, off_t from, off_t to );
108
109extern void *bpfiller( void *vbpb );
110extern int  bpdrain( bpio_t *bpio, int (*sink)( unsigned char *buf, int nbytes, void *arg ), void *arg );
111extern void bpsync( bpio_t *bpio );
112
113#endif
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