1 files changed, 42 insertions, 0 deletions
diff --git a/libphobos/testsuite/libphobos.gc/sigmaskgc.d b/libphobos/testsuite/libphobos.gc/sigmaskgc.d
new file mode 100644
index 00000000000..eb46316d18f
--- /dev/null
+++ b/libphobos/testsuite/libphobos.gc/sigmaskgc.d
@@ -0,0 +1,42 @@
+
+// https://issues.dlang.org/show_bug.cgi?id=20256
+
+extern(C) __gshared string[] rt_options = [ "gcopt=parallel:1" ];
+
+void main()
+{
+    version (Posix)
+    {
+        import core.sys.posix.signal;
+        import core.sys.posix.unistd;
+        import core.thread;
+        import core.memory;
+
+        sigset_t m;
+        sigemptyset(&m);
+        sigaddset(&m, SIGHUP);
+
+        auto x = new int[](10000);
+        foreach (i; 0 .. 10000)
+        {
+            x ~= i;
+        }
+        GC.collect();  // GC create thread
+
+        sigprocmask(SIG_BLOCK, &m, null); // block SIGHUP from delivery to main thread
+
+        auto parent_pid = getpid();
+        auto child_pid = fork();
+        assert(child_pid >= 0);
+        if (child_pid == 0)
+        {
+            kill(parent_pid, SIGHUP); // send signal to parent
+            _exit(0);
+        }
+        // parent
+        Thread.sleep(100.msecs);
+        // if we are here, then GC threads didn't receive SIGHUP,
+        // otherwise whole process killed
+        _exit(0);
+    }
+}