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  1. /*
  2.  * Mesa 3-D graphics library
  3.  *
  4.  * Copyright (C) 2012-2013 LunarG, Inc.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the "Software"),
  8.  * to deal in the Software without restriction, including without limitation
  9.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10.  * and/or sell copies of the Software, and to permit persons to whom the
  11.  * Software is furnished to do so, subject to the following conditions:
  12.  *
  13.  * The above copyright notice and this permission notice shall be included
  14.  * in all copies or substantial portions of the Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22.  * DEALINGS IN THE SOFTWARE.
  23.  *
  24.  * Authors:
  25.  *    Chia-I Wu <olv@lunarg.com>
  26.  */
  27.  
  28. #ifndef ILO_FENCE_H
  29. #define ILO_FENCE_H
  30.  
  31. #include "intel_winsys.h"
  32.  
  33. #include "ilo_core.h"
  34. #include "ilo_dev.h"
  35.  
  36. struct ilo_fence {
  37.    struct intel_bo *seq_bo;
  38. };
  39.  
  40. static inline void
  41. ilo_fence_init(struct ilo_fence *fence, const struct ilo_dev *dev)
  42. {
  43.    /* no-op */
  44. }
  45.  
  46. static inline void
  47. ilo_fence_cleanup(struct ilo_fence *fence)
  48. {
  49.    intel_bo_unref(fence->seq_bo);
  50. }
  51.  
  52. /**
  53.  * Set the sequence bo for waiting.  The fence is considered signaled when
  54.  * there is no sequence bo.
  55.  */
  56. static inline void
  57. ilo_fence_set_seq_bo(struct ilo_fence *fence, struct intel_bo *seq_bo)
  58. {
  59.    intel_bo_unref(fence->seq_bo);
  60.    fence->seq_bo = intel_bo_ref(seq_bo);
  61. }
  62.  
  63. /**
  64.  * Wait for the fence to be signaled or until \p timeout nanoseconds has
  65.  * passed.  It will wait indefinitely when \p timeout is negative.
  66.  */
  67. static inline bool
  68. ilo_fence_wait(struct ilo_fence *fence, int64_t timeout)
  69. {
  70.    return (!fence->seq_bo || intel_bo_wait(fence->seq_bo, timeout) == 0);
  71. }
  72.  
  73. #endif /* ILO_FENCE_H */
  74.