lp_fence.h

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 * Copyright 2009 VMware, Inc.
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#ifndef LP_FENCE_H
#define LP_FENCE_H


#include "os/os_thread.h"
#include "pipe/p_state.h"
#include "util/u_inlines.h"


struct pipe_screen;


struct lp_fence
{
   struct pipe_reference reference;
   unsigned id;

   mtx_t mutex;
   cnd_t signalled;

   boolean issued;
   unsigned rank;
   unsigned count;
};


struct lp_fence *
lp_fence_create(unsigned rank);


void
lp_fence_signal(struct lp_fence *fence);

boolean
lp_fence_signalled(struct lp_fence *fence);

void
lp_fence_wait(struct lp_fence *fence);

boolean
lp_fence_timedwait(struct lp_fence *fence, uint64_t timeout);

void
llvmpipe_init_screen_fence_funcs(struct pipe_screen *screen);


void
lp_fence_destroy(struct lp_fence *fence);

static inline void
lp_fence_reference(struct lp_fence **ptr,
                   struct lp_fence *f)
{
   struct lp_fence *old = *ptr;

   if (pipe_reference(&old->reference, &f->reference)) {
      lp_fence_destroy(old);
   }
   
   *ptr = f;
}

static inline boolean
lp_fence_issued(const struct lp_fence *fence)
{
   return fence->issued;
}


#endif /* LP_FENCE_H */