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      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 #ifndef LP_FENCE_H
     30 #define LP_FENCE_H
     31 
     32 
     33 #include "os/os_thread.h"
     34 #include "pipe/p_state.h"
     35 #include "util/u_inlines.h"
     36 
     37 
     38 struct pipe_screen;
     39 
     40 
     41 struct lp_fence
     42 {
     43    struct pipe_reference reference;
     44    unsigned id;
     45 
     46    pipe_mutex mutex;
     47    pipe_condvar signalled;
     48 
     49    boolean issued;
     50    unsigned rank;
     51    unsigned count;
     52 };
     53 
     54 
     55 struct lp_fence *
     56 lp_fence_create(unsigned rank);
     57 
     58 
     59 void
     60 lp_fence_signal(struct lp_fence *fence);
     61 
     62 boolean
     63 lp_fence_signalled(struct lp_fence *fence);
     64 
     65 void
     66 lp_fence_wait(struct lp_fence *fence);
     67 
     68 void
     69 llvmpipe_init_screen_fence_funcs(struct pipe_screen *screen);
     70 
     71 
     72 void
     73 lp_fence_destroy(struct lp_fence *fence);
     74 
     75 static inline void
     76 lp_fence_reference(struct lp_fence **ptr,
     77                    struct lp_fence *f)
     78 {
     79    struct lp_fence *old = *ptr;
     80 
     81    if (pipe_reference(&old->reference, &f->reference)) {
     82       lp_fence_destroy(old);
     83    }
     84 
     85    *ptr = f;
     86 }
     87 
     88 static inline boolean
     89 lp_fence_issued(const struct lp_fence *fence)
     90 {
     91    return fence->issued;
     92 }
     93 
     94 
     95 #endif /* LP_FENCE_H */
     96