summaryrefslogtreecommitdiff
path: root/src/gallium/drivers/llvmpipe/lp_bin_queue.c
blob: 0fda0b5baeb1ace05edb90f51cd43dc1cc4ae37b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
/**************************************************************************
 *
 * Copyright 2009 VMware, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/


/**
 * Bin queue.  We'll use two queues.  One contains "full" bins which
 * are produced by the "setup" code.  The other contains "empty" bins
 * which are produced by the "rast" code when it finishes rendering a bin.
 */


#include "pipe/p_thread.h"
#include "lp_bin.h"
#include "lp_bin_queue.h"



#define MAX_BINS 4


/**
 * A queue of bins
 */
struct lp_bins_queue
{
   /** XXX might use a linked list here somedone, but the list will
    * probably always be pretty short.
    */
   struct lp_bins *bins[MAX_BINS];
   unsigned size;

   pipe_condvar size_change;
   pipe_mutex mutex;
};



/** Allocate a new bins queue */
struct lp_bins_queue *
lp_bins_queue_create(void)
{
   struct lp_bins_queue *queue = CALLOC_STRUCT(lp_bins_queue);
   if (queue) {
      pipe_condvar_init(queue->size_change);
      pipe_mutex_init(queue->mutex);
   }
   return queue;
}


/** Delete a new bins queue */
void
lp_bins_queue_destroy(struct lp_bins_queue *queue)
{
   pipe_condvar_destroy(queue->size_change);
   pipe_mutex_destroy(queue->mutex);
}


/** Remove first lp_bins from head of queue */
struct lp_bins *
lp_bins_dequeue(struct lp_bins_queue *queue)
{
   struct lp_bins *bins;
   unsigned i;

   pipe_mutex_lock(queue->mutex);
   while (queue->size == 0) {
      pipe_condvar_wait(queue->size_change, queue->mutex);
   }

   assert(queue->size >= 1);

   /* get head */
   bins = queue->bins[0];

   /* shift entries */
   for (i = 0; i < queue->size - 1; i++) {
      queue->bins[i] = queue->bins[i + 1];
   }

   queue->size--;

   /* signal size change */
   pipe_condvar_signal(queue->size_change);

   pipe_mutex_unlock(queue->mutex);

   return bins;
}


/** Add an lp_bins to tail of queue */
void
lp_bins_enqueue(struct lp_bins_queue *queue, struct lp_bins *bins)
{
   pipe_mutex_lock(queue->mutex);

   assert(queue->size < MAX_BINS);

   /* debug: check that bins is not already in the queue */
   if (0) {
      unsigned i;
      for (i = 0; i < queue->size; i++) {
         assert(queue->bins[i] != bins);
      }
   }

   /* add to end */
   queue->bins[queue->size++] = bins;

   /* signal size change */
   pipe_condvar_signal(queue->size_change);

   pipe_mutex_unlock(queue->mutex);
}


/** Return number of entries in the queue */
unsigned
lp_bins_queue_size(struct lp_bins_queue *queue)
{
   unsigned sz;
   pipe_mutex_lock(queue->mutex);
   sz = queue->size;
   pipe_mutex_unlock(queue->mutex);
   return sz;
}


/** Wait until the queue as 'size' entries */
void
lp_bins_queue_wait_size(struct lp_bins_queue *queue, unsigned size)
{
   pipe_mutex_lock(queue->mutex);
   while (queue->size != size) {
      pipe_condvar_wait(queue->size_change, queue->mutex);
   }
   pipe_mutex_unlock(queue->mutex);
}