1 files changed, 61 insertions, 0 deletions
diff --git a/packages/Python/lldbsuite/test/functionalities/thread/multi_break/main.cpp b/packages/Python/lldbsuite/test/functionalities/thread/multi_break/main.cpp
new file mode 100644
index 000000000000..01f4b8f98ea7
--- /dev/null
+++ b/packages/Python/lldbsuite/test/functionalities/thread/multi_break/main.cpp
@@ -0,0 +1,61 @@
+//===-- main.cpp ------------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// This test is intended to create a situation in which a breakpoint will be
+// hit in two threads at nearly the same moment.  The expected result is that
+// the breakpoint in the second thread will be hit while the breakpoint handler
+// in the first thread is trying to stop all threads.
+
+#include <atomic>
+#include <thread>
+
+// 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.
+#define do_nothing()
+
+#define pseudo_barrier_wait(bar) \
+    --bar;                       \
+    while (bar > 0)              \
+        do_nothing();
+
+#define pseudo_barrier_init(bar, count) (bar = count)
+
+std::atomic_int g_barrier;
+
+volatile int g_test = 0;
+
+void *
+thread_func ()
+{
+    // Wait until both threads are running
+    pseudo_barrier_wait(g_barrier);
+
+    // Do something
+    g_test++;       // Set breakpoint here
+
+    // Return
+    return NULL;
+}
+
+int main ()
+{
+    // Don't let either thread do anything until they're both ready.
+    pseudo_barrier_init(g_barrier, 2);
+
+    // Create two threads
+    std::thread thread_1(thread_func);
+    std::thread thread_2(thread_func);
+
+    // Wait for the threads to finish
+    thread_1.join();
+    thread_2.join();
+
+    return 0;
+}