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,
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  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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  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
  35 struct lp_fence *
  36 lp_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
  51 static void
  52 lp_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
  60 static void
  61 llvmpipe_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
  74 static int
  75 llvmpipe_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
  85 static int
  86 llvmpipe_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
 104 void
 105 llvmpipe_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 }