Add a new watchdog timer interface. The interface does not permit handling timeouts, so

it's only really useful if you're going to crash anyways. Use it in the pretty stack trace
printer to kill the compiler if we hang while printing the stack trace.

llvm-svn: 177962

1 files changed, 32 insertions, 0 deletions

diff --git a/llvm/lib/Support/Unix/Watchdog.inc b/llvm/lib/Support/Unix/Watchdog.inc
new file mode 100644
index 00000000000..5d89c0e51b1
--- /dev/null
+++ b/llvm/lib/Support/Unix/Watchdog.inc
@@ -0,0 +1,32 @@
+//===--- Unix/Watchdog.inc - Unix Watchdog Implementation -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides the generic Unix implementation of the Watchdog class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+namespace llvm {
+  namespace sys {
+    Watchdog::Watchdog(unsigned int seconds) {
+#ifdef HAVE_UNISTD_H
+      alarm(seconds);
+#endif
+    }
+
+    Watchdog::~Watchdog() {
+#ifdef HAVE_UNISTD_H
+      alarm(0);
+#endif
+    }
+  }
+}