1 files changed, 76 insertions, 0 deletions
diff --git a/lit/ExecControl/StopHook/Inputs/stop-hook-threads.cpp b/lit/ExecControl/StopHook/Inputs/stop-hook-threads.cpp
new file mode 100644
index 000000000000..dab133d9d952
--- /dev/null
+++ b/lit/ExecControl/StopHook/Inputs/stop-hook-threads.cpp
@@ -0,0 +1,76 @@
+//===-- main.cpp ------------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <chrono>
+#include <cstdio>
+#include <mutex>
+#include <random>
+#include <thread>
+
+std::default_random_engine g_random_engine{std::random_device{}()};
+std::uniform_int_distribution<> g_distribution{0, 3000};
+
+uint32_t g_val = 0;
+
+uint32_t
+access_pool (bool flag = false)
+{
+    static std::mutex g_access_mutex;
+    if (!flag)
+        g_access_mutex.lock();
+
+    uint32_t old_val = g_val;
+    if (flag)
+        g_val = old_val + 1;
+
+    if (!flag)
+        g_access_mutex.unlock();
+    return g_val;
+}
+
+void
+thread_func (uint32_t thread_index)
+{
+    // Break here to test that the stop-hook mechanism works for multiple threads.
+    printf ("%s (thread index = %u) startng...\n", __FUNCTION__, thread_index);
+
+    uint32_t count = 0;
+    uint32_t val;
+    while (count++ < 4)
+    {
+        // random micro second sleep from zero to .3 seconds
+        int usec = g_distribution(g_random_engine);
+        printf ("%s (thread = %u) doing a usleep (%d)...\n", __FUNCTION__, thread_index, usec);
+        std::this_thread::sleep_for(std::chrono::microseconds{usec}); // Set break point at this line
+
+        if (count < 2)
+            val = access_pool ();
+        else
+            val = access_pool (true);
+
+        printf ("%s (thread = %u) after usleep access_pool returns %d (count=%d)...\n", __FUNCTION__, thread_index, val, count);
+    }
+    printf ("%s (thread index = %u) exiting...\n", __FUNCTION__, thread_index);
+}
+
+
+int main (int argc, char const *argv[])
+{
+    std::thread threads[3];
+
+    // Create 3 threads
+    for (auto &thread : threads)
+        thread = std::thread{thread_func, std::distance(threads, &thread)};
+
+    // Join all of our threads
+    for (auto &thread : threads)
+        thread.join();
+
+    return 0;
+}