1 files changed, 60 insertions, 0 deletions
diff --git a/lldb/packages/Python/lldbsuite/test/commands/expression/no-deadlock/TestExprDoesntBlock.py b/lldb/packages/Python/lldbsuite/test/commands/expression/no-deadlock/TestExprDoesntBlock.py
new file mode 100644
index 00000000000..5b5042b63e4
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/commands/expression/no-deadlock/TestExprDoesntBlock.py
@@ -0,0 +1,60 @@
+"""
+Test that expr will time out and allow other threads to run if it blocks.
+"""
+
+from __future__ import print_function
+
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class ExprDoesntDeadlockTestCase(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    @expectedFailureAll(oslist=['freebsd'], bugnumber='llvm.org/pr17946')
+    @expectedFailureAll(
+        oslist=["windows"],
+        bugnumber="Windows doesn't have pthreads, test needs to be ported")
+    @add_test_categories(["basic_process"])
+    def test_with_run_command(self):
+        """Test that expr will time out and allow other threads to run if it blocks."""
+        self.build()
+        exe = self.getBuildArtifact("a.out")
+
+        # Create a target by the debugger.
+        target = self.dbg.CreateTarget(exe)
+        self.assertTrue(target, VALID_TARGET)
+
+        # Now create a breakpoint at source line before call_me_to_get_lock
+        # gets called.
+
+        main_file_spec = lldb.SBFileSpec("locking.c")
+        breakpoint = target.BreakpointCreateBySourceRegex(
+            'Break here', main_file_spec)
+        if self.TraceOn():
+            print("breakpoint:", breakpoint)
+        self.assertTrue(breakpoint and
+                        breakpoint.GetNumLocations() == 1,
+                        VALID_BREAKPOINT)
+
+        # Now launch the process, and do not stop at entry point.
+        process = target.LaunchSimple(
+            None, None, self.get_process_working_directory())
+        self.assertTrue(process, PROCESS_IS_VALID)
+
+        # Frame #0 should be on self.line1 and the break condition should hold.
+        from lldbsuite.test.lldbutil import get_stopped_thread
+        thread = get_stopped_thread(process, lldb.eStopReasonBreakpoint)
+        self.assertTrue(
+            thread.IsValid(),
+            "There should be a thread stopped due to breakpoint condition")
+
+        frame0 = thread.GetFrameAtIndex(0)
+
+        var = frame0.EvaluateExpression("call_me_to_get_lock()")
+        self.assertTrue(var.IsValid())
+        self.assertTrue(var.GetValueAsSigned(0) == 567)