Vendor import of lldb trunk r256945:

https://llvm.org/svn/llvm-project/lldb/trunk@256945

1 files changed, 50 insertions, 0 deletions

diff --git a/packages/Python/lldbsuite/test/functionalities/attach_resume/main.cpp b/packages/Python/lldbsuite/test/functionalities/attach_resume/main.cpp
new file mode 100644
index 0000000..7cf3602
--- /dev/null
+++ b/packages/Python/lldbsuite/test/functionalities/attach_resume/main.cpp
@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <fcntl.h>
+
+#include <chrono>
+#include <thread>
+
+#if defined(__linux__)
+#include <sys/prctl.h>
+#endif
+
+volatile bool debugger_flag = true; // The debugger will flip this to false
+
+void *start(void *data)
+{
+    int i;
+    size_t idx = (size_t)data;
+    for (i=0; i<30; i++)
+    {
+        if ( idx == 0 && debugger_flag)
+            std::this_thread::sleep_for(std::chrono::microseconds(1)); // Set breakpoint here
+        std::this_thread::sleep_for(std::chrono::seconds(1));
+    }
+    return 0;
+}
+
+int main(int argc, char const *argv[])
+{
+#if defined(__linux__)
+    // Immediately enable any ptracer so that we can allow the stub attach
+    // operation to succeed.  Some Linux kernels are locked down so that
+    // only an ancestor process can be a ptracer of a process.  This disables that
+    // restriction.  Without it, attach-related stub tests will fail.
+#if defined(PR_SET_PTRACER) && defined(PR_SET_PTRACER_ANY)
+    // For now we execute on best effort basis.  If this fails for
+    // some reason, so be it.
+    const int prctl_result = prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0);
+    static_cast<void> (prctl_result);
+#endif
+#endif
+
+    static const size_t nthreads = 16;
+    std::thread threads[nthreads];
+    size_t i;
+
+    for (i=0; i<nthreads; i++)
+        threads[i] = std::move(std::thread(start, (void*)i));
+
+    for (i=0; i<nthreads; i++)
+        threads[i].join();
+}