[Mesa-dev] [PATCH v3 1/1] clover: Wait for requested operation if blocking flag is set

[Francisco Jerez]

Jan Vesely <jan.vesely at rutgers.edu> writes:

> v2: wait in map_buffer and map_image as well
> v3: use event::wait instead of wait (skips fence wait for hard_event)
>

Unfortunately this won't wait for the event action to be executed, only
for all dependencies of the event to become signalled, so there's a
possibility for a race condition in a multi-threaded environment.  Using
wait_signalled as I suggested earlier would address this issue.

> Signed-off-by: Jan Vesely <jan.vesely at rutgers.edu>
> ---
>  src/gallium/state_trackers/clover/api/transfer.cpp | 30 ++++++++++++++++++++--
>  1 file changed, 28 insertions(+), 2 deletions(-)
>
> diff --git a/src/gallium/state_trackers/clover/api/transfer.cpp b/src/gallium/state_trackers/clover/api/transfer.cpp
> index f7046253be..6f1ac4b931 100644
> --- a/src/gallium/state_trackers/clover/api/transfer.cpp
> +++ b/src/gallium/state_trackers/clover/api/transfer.cpp
> @@ -295,6 +295,9 @@ clEnqueueReadBuffer(cl_command_queue d_q, cl_mem d_mem, cl_bool blocking,
>                     &mem, obj_origin, obj_pitch,
>                     region));
>  
> +   if (blocking)
> +       hev().event::wait();
> +
>     ret_object(rd_ev, hev);
>     return CL_SUCCESS;
>  
> @@ -325,6 +328,9 @@ clEnqueueWriteBuffer(cl_command_queue d_q, cl_mem d_mem, cl_bool blocking,
>                     ptr, {}, obj_pitch,
>                     region));
>  
> +   if (blocking)
> +       hev().event::wait();
> +
>     ret_object(rd_ev, hev);
>     return CL_SUCCESS;
>  
> @@ -362,6 +368,9 @@ clEnqueueReadBufferRect(cl_command_queue d_q, cl_mem d_mem, cl_bool blocking,
>                     &mem, obj_origin, obj_pitch,
>                     region));
>  
> +   if (blocking)
> +       hev().event::wait();
> +
>     ret_object(rd_ev, hev);
>     return CL_SUCCESS;
>  
> @@ -399,6 +408,9 @@ clEnqueueWriteBufferRect(cl_command_queue d_q, cl_mem d_mem, cl_bool blocking,
>                     ptr, host_origin, host_pitch,
>                     region));
>  
> +   if (blocking)
> +       hev().event::wait();
> +
>     ret_object(rd_ev, hev);
>     return CL_SUCCESS;
>  
> @@ -504,6 +516,9 @@ clEnqueueReadImage(cl_command_queue d_q, cl_mem d_mem, cl_bool blocking,
>                     &img, src_origin, src_pitch,
>                     region));
>  
> +   if (blocking)
> +       hev().event::wait();
> +
>     ret_object(rd_ev, hev);
>     return CL_SUCCESS;
>  
> @@ -538,6 +553,9 @@ clEnqueueWriteImage(cl_command_queue d_q, cl_mem d_mem, cl_bool blocking,
>                     ptr, {}, src_pitch,
>                     region));
>  
> +   if (blocking)
> +       hev().event::wait();
> +
>     ret_object(rd_ev, hev);
>     return CL_SUCCESS;
>  
> @@ -667,7 +685,11 @@ clEnqueueMapBuffer(cl_command_queue d_q, cl_mem d_mem, cl_bool blocking,
>  
>     void *map = mem.resource(q).add_map(q, flags, blocking, obj_origin, region);
>  
> -   ret_object(rd_ev, create<hard_event>(q, CL_COMMAND_MAP_BUFFER, deps));
> +   auto hev = create<hard_event>(q, CL_COMMAND_MAP_BUFFER, deps);
> +   if (blocking)
> +       hev().event::wait();
> +
> +   ret_object(rd_ev, hev);
>     ret_error(r_errcode, CL_SUCCESS);
>     return map;
>  
> @@ -695,7 +717,11 @@ clEnqueueMapImage(cl_command_queue d_q, cl_mem d_mem, cl_bool blocking,
>  
>     void *map = img.resource(q).add_map(q, flags, blocking, origin, region);
>  
> -   ret_object(rd_ev, create<hard_event>(q, CL_COMMAND_MAP_IMAGE, deps));
> +   auto hev = create<hard_event>(q, CL_COMMAND_MAP_IMAGE, deps);
> +   if (blocking)
> +       hev().event::wait();
> +
> +   ret_object(rd_ev, hev);
>     ret_error(r_errcode, CL_SUCCESS);
>     return map;
>  
> -- 
> 2.13.5
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