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diff --git a/libunwindstack/utils/PidUtils.h b/libunwindstack/utils/PidUtils.h
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+++ b/libunwindstack/utils/PidUtils.h
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+/*
+ * Copyright (C) 2022 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 _LIBUNWINDSTACK_UTILS_PID_UTILS_H
+#define _LIBUNWINDSTACK_UTILS_PID_UTILS_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <functional>
+
+namespace unwindstack {
+
+enum PidRunEnum : uint8_t {
+  PID_RUN_KEEP_GOING,
+  PID_RUN_PASS,
+  PID_RUN_FAIL,
+};
+
+bool Quiesce(pid_t pid);
+
+bool Attach(pid_t pid);
+
+bool Detach(pid_t pid);
+
+bool RunWhenQuiesced(pid_t pid, bool leave_attached, std::function<PidRunEnum()> fn);
+
+}  // namespace unwindstack
+
+#endif  // _LIBUNWINDSTACK_UTILS_PID_UTILS_H