1 files changed, 21 insertions, 0 deletions
diff --git a/gnu/llvm/lldb/packages/Python/lldbsuite/test/make/pseudo_barrier.h b/gnu/llvm/lldb/packages/Python/lldbsuite/test/make/pseudo_barrier.h
new file mode 100644
index 00000000000..e4066b72e02
--- /dev/null
+++ b/gnu/llvm/lldb/packages/Python/lldbsuite/test/make/pseudo_barrier.h
@@ -0,0 +1,21 @@
+#include <atomic>
+
+// Note that although hogging the CPU while waiting for a variable to change
+// would be terrible in production code, it's great for testing since it avoids
+// a lot of messy context switching to get multiple threads synchronized.
+
+typedef std::atomic<int> pseudo_barrier_t;
+
+#define pseudo_barrier_wait(barrier)        \
+    do                                      \
+    {                                       \
+        --(barrier);                        \
+        while ((barrier).load() > 0)        \
+            ;                               \
+    } while (0)
+
+#define pseudo_barrier_init(barrier, count) \
+    do                                      \
+    {                                       \
+        (barrier) = (count);                \
+    } while (0)