[Openmp-commits] [openmp] [Libomptarget] Fix Nvidia offloading hanging on dataRetrieve using RPC (PR #66817)

[Shilei Tian via Openmp-commits]

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@@ -0,0 +1,22 @@
+// RUN: %libomptarget-compile-run-and-check-generic
+
+// REQUIRES: libc
+
+#include <assert.h>
+#include <stdio.h>
+
+#pragma omp declare target to(stdout)
+
+int main() {
+  int r = 0;
+// CHECK: PASS
+#pragma omp target map(from : r)
+  { r = fwrite("PASS\n", 1, sizeof("PASS\n") - 1, stdout); }
+  assert(r == sizeof("PASS\n") - 1 && "Incorrect number of bytes written");
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shiltian wrote:

The current behavior looks like all those async operations can only be "enqueued" at certain point but because the device is busy waiting for the RPC request, it didn't reach the point. As a consequence, the host side is stuck at "issuing" stage.

https://github.com/llvm/llvm-project/pull/66817