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D62398.diff
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Thu, Apr 9, 8:46 PM

D62398.diff

Index: openmp/trunk/libomptarget/deviceRTLs/nvptx/src/sync.cu
===================================================================
--- openmp/trunk/libomptarget/deviceRTLs/nvptx/src/sync.cu
+++ openmp/trunk/libomptarget/deviceRTLs/nvptx/src/sync.cu
@@ -62,6 +62,9 @@
// Barrier #1 is for synchronization among active threads.
named_sync(L1_BARRIER, threads);
}
+ } else {
+ // Still need to flush the memory per the standard.
+ __kmpc_flush(loc_ref);
} // numberOfActiveOMPThreads > 1
PRINT0(LD_SYNC, "completed kmpc_barrier\n");
}
Index: openmp/trunk/libomptarget/deviceRTLs/nvptx/test/parallel/barrier.c
===================================================================
--- openmp/trunk/libomptarget/deviceRTLs/nvptx/test/parallel/barrier.c
+++ openmp/trunk/libomptarget/deviceRTLs/nvptx/test/parallel/barrier.c
@@ -0,0 +1,37 @@
+// RUN: %compile-run-and-check
+
+#include <omp.h>
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+ int data, out, flag = 0;
+#pragma omp target teams num_teams(2) map(tofrom \
+ : out) map(to \
+ : data, flag) \
+ thread_limit(1)
+#pragma omp parallel num_threads(1)
+ {
+ if (omp_get_team_num() == 0) {
+ /* Write to the data buffer that will be read by thread in team 1 */
+ data = 42;
+/* Flush data to thread in team 1 */
+#pragma omp barrier
+ /* Set flag to release thread in team 1 */
+#pragma omp atomic write
+ flag = 1;
+ } else if (omp_get_team_num() == 1) {
+ /* Loop until we see the update to the flag */
+ int val;
+ do {
+#pragma omp atomic read
+ val = flag;
+ } while (val < 1);
+ out = data;
+#pragma omp barrier
+ }
+ }
+ // CHECK: out=42.
+ /* Value of out will be 42 */
+ printf("out=%d.\n", out);
+ return !(out == 42);
+}

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