src/gallium/drivers/llvmpipe/lp_fence.c

   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
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  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_debug.h"
  33 #include "lp_fence.h"
  34
  35
  36 struct lp_fence *
  37 lp_fence_create(unsigned rank)
  38 {
  39    struct lp_fence *fence = CALLOC_STRUCT(lp_fence);
  40
  41    pipe_reference_init(&fence->reference, 1);
  42
  43    pipe_mutex_init(fence->mutex);
  44    pipe_condvar_init(fence->signalled);
  45
  46    fence->rank = rank;
  47
  48    return fence;
  49 }
  50
  51
  52 static void
  53 lp_fence_destroy(struct lp_fence *fence)
  54 {
  55    pipe_mutex_destroy(fence->mutex);
  56    pipe_condvar_destroy(fence->signalled);
  57    FREE(fence);
  58 }
  59
  60
  61 static void
  62 llvmpipe_fence_reference(struct pipe_screen *screen,
  63                          struct pipe_fence_handle **ptr,
  64                          struct pipe_fence_handle *fence)
  65 {
  66    struct lp_fence *old = (struct lp_fence *) *ptr;
  67    struct lp_fence *f = (struct lp_fence *) fence;
  68
  69    if (pipe_reference(&old->reference, &f->reference)) {
  70       lp_fence_destroy(old);
  71    }
  72 }
  73
  74
  75 static int
  76 llvmpipe_fence_signalled(struct pipe_screen *screen,
  77                          struct pipe_fence_handle *fence,
  78                          unsigned flag)
  79 {
  80    struct lp_fence *f = (struct lp_fence *) fence;
  81
  82    return f->count == f->rank;
  83 }
  84
  85
  86 static int
  87 llvmpipe_fence_finish(struct pipe_screen *screen,
  88                       struct pipe_fence_handle *fence_handle,
  89                       unsigned flag)
  90 {
  91    struct lp_fence *fence = (struct lp_fence *) fence_handle;
  92
  93    pipe_mutex_lock(fence->mutex);
  94    while (fence->count < fence->rank) {
  95       pipe_condvar_wait(fence->signalled, fence->mutex);
  96    }
  97    pipe_mutex_unlock(fence->mutex);
  98
  99    return 0;
 100 }
 101
 102
 103 void
 104 lp_fence_signal(struct lp_fence *fence)
 105 {
 106    pipe_mutex_lock(fence->mutex);
 107
 108    fence->count++;
 109    assert(fence->count <= fence->rank);
 110
 111    LP_DBG(DEBUG_RAST, "%s count=%u rank=%u\n", __FUNCTION__,
 112           fence->count, fence->rank);
 113
 114    pipe_condvar_signal(fence->signalled);
 115
 116    pipe_mutex_unlock(fence->mutex);
 117 }
 118
 119
 120 void
 121 llvmpipe_init_screen_fence_funcs(struct pipe_screen *screen)
 122 {
 123    screen->fence_reference = llvmpipe_fence_reference;
 124    screen->fence_signalled = llvmpipe_fence_signalled;
 125    screen->fence_finish = llvmpipe_fence_finish;
 126 }