lp_fence.c revision cdc920a0 
1/**************************************************************************
2 *
3 * Copyright 2009 VMware, Inc.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28
29#include "pipe/p_screen.h"
30#include "util/u_memory.h"
31#include "util/u_inlines.h"
32#include "lp_fence.h"
33
34
35struct lp_fence *
36lp_fence_create(unsigned rank)
37{
38   struct lp_fence *fence = CALLOC_STRUCT(lp_fence);
39
40   pipe_reference_init(&fence->reference, 1);
41
42   pipe_mutex_init(fence->mutex);
43   pipe_condvar_init(fence->signalled);
44
45   fence->rank = rank;
46
47   return fence;
48}
49
50
51static void
52lp_fence_destroy(struct lp_fence *fence)
53{
54   pipe_mutex_destroy(fence->mutex);
55   pipe_condvar_destroy(fence->signalled);
56   FREE(fence);
57}
58
59
60static void
61llvmpipe_fence_reference(struct pipe_screen *screen,
62                         struct pipe_fence_handle **ptr,
63                         struct pipe_fence_handle *fence)
64{
65   struct lp_fence *old = (struct lp_fence *) *ptr;
66   struct lp_fence *f = (struct lp_fence *) fence;
67
68   if (pipe_reference(&old->reference, &f->reference)) {
69      lp_fence_destroy(old);
70   }
71}
72
73
74static int
75llvmpipe_fence_signalled(struct pipe_screen *screen,
76                         struct pipe_fence_handle *fence,
77                         unsigned flag)
78{
79   struct lp_fence *f = (struct lp_fence *) fence;
80
81   return f->count == f->rank;
82}
83
84
85static int
86llvmpipe_fence_finish(struct pipe_screen *screen,
87                      struct pipe_fence_handle *fence_handle,
88                      unsigned flag)
89{
90   struct lp_fence *fence = (struct lp_fence *) fence_handle;
91
92   pipe_mutex_lock(fence->mutex);
93   while (fence->count < fence->rank) {
94      pipe_condvar_wait(fence->signalled, fence->mutex);
95   }
96   pipe_mutex_unlock(fence->mutex);
97
98   return 0;
99}
100
101
102
103
104void
105llvmpipe_init_screen_fence_funcs(struct pipe_screen *screen)
106{
107   screen->fence_reference = llvmpipe_fence_reference;
108   screen->fence_signalled = llvmpipe_fence_signalled;
109   screen->fence_finish = llvmpipe_fence_finish;
110}
111