1 files changed, 63 insertions, 0 deletions
diff --git a/runtime/signal_catcher.h b/runtime/signal_catcher.h
new file mode 100644
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--- /dev/null
+++ b/runtime/signal_catcher.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_SRC_SIGNAL_CATCHER_H_
+#define ART_SRC_SIGNAL_CATCHER_H_
+
+#include "base/mutex.h"
+
+namespace art {
+
+class Runtime;
+class SignalSet;
+class Thread;
+
+/*
+ * A daemon thread that catches signals and does something useful. For
+ * example, when a SIGQUIT (Ctrl-\) arrives, we suspend and dump the
+ * status of all threads.
+ */
+class SignalCatcher {
+ public:
+  explicit SignalCatcher(const std::string& stack_trace_file);
+  ~SignalCatcher();
+
+  void HandleSigQuit() LOCKS_EXCLUDED(Locks::mutator_lock_,
+                                      Locks::thread_list_lock_,
+                                      Locks::thread_suspend_count_lock_);
+
+
+ private:
+  static void* Run(void* arg);
+
+  void HandleSigUsr1();
+  void Output(const std::string& s);
+  void SetHaltFlag(bool new_value);
+  bool ShouldHalt();
+  int WaitForSignal(Thread* self, SignalSet& signals);
+
+  std::string stack_trace_file_;
+
+  mutable Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
+  ConditionVariable cond_ GUARDED_BY(lock_);
+  bool halt_ GUARDED_BY(lock_);
+  pthread_t pthread_ GUARDED_BY(lock_);
+  Thread* thread_ GUARDED_BY(lock_);
+};
+
+}  // namespace art
+
+#endif  // ART_SRC_SIGNAL_CATCHER_H_