src/gallium/drivers/llvmpipe/lp_fence.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
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   7  * copy of this software and associated documentation files (the
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  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.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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  26  **************************************************************************/
  27
  28
  29 #include "pipe/p_screen.h"
  30 #include "util/u_memory.h"
  31 #include "lp_fence.h"
  32
  33
  34 struct lp_fence *
  35 lp_fence_create(unsigned rank)
  36 {
  37    struct lp_fence *fence = CALLOC_STRUCT(lp_fence);
  38
  39    pipe_reference_init(&fence->reference, 1);
  40
  41    pipe_mutex_init(fence->mutex);
  42    pipe_condvar_init(fence->signalled);
  43
  44    fence->rank = rank;
  45
  46    return fence;
  47 }
  48
  49
  50 static void
  51 lp_fence_destroy(struct lp_fence *fence)
  52 {
  53    pipe_mutex_destroy(fence->mutex);
  54    pipe_condvar_destroy(fence->signalled);
  55    FREE(fence);
  56 }
  57
  58
  59 static void
  60 llvmpipe_fence_reference(struct pipe_screen *screen,
  61                          struct pipe_fence_handle **ptr,
  62                          struct pipe_fence_handle *fence)
  63 {
  64    struct lp_fence *old = (struct lp_fence *) *ptr;
  65    struct lp_fence *f = (struct lp_fence *) fence;
  66
  67    if (pipe_reference(&old->reference, &f->reference)) {
  68       lp_fence_destroy(old);
  69    }
  70 }
  71
  72
  73 static int
  74 llvmpipe_fence_signalled(struct pipe_screen *screen,
  75                          struct pipe_fence_handle *fence,
  76                          unsigned flag)
  77 {
  78    struct lp_fence *f = (struct lp_fence *) fence;
  79
  80    return f->count == f->rank;
  81 }
  82
  83
  84 static int
  85 llvmpipe_fence_finish(struct pipe_screen *screen,
  86                       struct pipe_fence_handle *fence_handle,
  87                       unsigned flag)
  88 {
  89    struct lp_fence *fence = (struct lp_fence *) fence_handle;
  90
  91    pipe_mutex_lock(fence->mutex);
  92    while (fence->count < fence->rank) {
  93       pipe_condvar_wait(fence->signalled, fence->mutex);
  94    }
  95    pipe_mutex_unlock(fence->mutex);
  96
  97    return 0;
  98 }
  99
 100
 101
 102
 103 void
 104 llvmpipe_init_screen_fence_funcs(struct pipe_screen *screen)
 105 {
 106    screen->fence_reference = llvmpipe_fence_reference;
 107    screen->fence_signalled = llvmpipe_fence_signalled;
 108    screen->fence_finish = llvmpipe_fence_finish;
 109 }