[SYCL][PI][CUDA] Fix transfer stream reuse (#6354)

t4c1 · web-flow · commit e848c15f93bb · 2022-06-24T13:53:03.000+01:00
Fixed a bug that can cause transfer stream to be reused for compute, messing up the synchronization.
diff --git a/sycl/plugins/cuda/pi_cuda.hpp b/sycl/plugins/cuda/pi_cuda.hpp
@@ -466,7 +466,7 @@ struct _pi_queue {
   bool can_reuse_stream(pi_uint32 stream_token) {
     // stream token not associated with one of the compute streams
     if (stream_token == std::numeric_limits<pi_uint32>::max()) {
-      return true;
+      return false;
     }
     // If the command represented by the stream token was not the last command
     // enqueued to the stream we can not reuse the stream - we need to allow for

Original file line number	Diff line number	Diff line change
`@@ -466,7 +466,7 @@ struct _pi_queue {`
`466`	`466`	`bool can_reuse_stream(pi_uint32 stream_token) {`
`467`	`467`	`// stream token not associated with one of the compute streams`
`468`	`468`	`if (stream_token == std::numeric_limits<pi_uint32>::max()) {`
`469`		`- return true;`
	`469`	`+ return false;`
`470`	`470`	`}`
`471`	`471`	`// If the command represented by the stream token was not the last command`
`472`	`472`	`// enqueued to the stream we can not reuse the stream - we need to allow for`