Import of the watch repository from Pebble

src/fw/services/normal/persist.h

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+/*
+ * Copyright 2024 Google LLC
+ *
+ * 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.
+ */
+
+#pragma once
+
+//! Persist service
+//!
+//! The persist service manages persistent app key-value stores. A persistent
+//! store is simply a SettingsFile identified by the app's UUID. The service
+//! manages the creation, opening and deletion of persist stores so that an app
+//! and its worker can both access the same file through a single file handle
+//! and SettingsFile state object.
+//!
+//! The persist service makes no attempt to make SettingsFile reentrant; it is
+//! the caller's responsibility to enforce mutual exclusion and prevent
+//! concurrent access to the SettingsFile.
+
+#include <stdint.h>
+#include <stddef.h>
+
+#include "util/uuid.h"
+#include "process_management/app_install_types.h"
+#include "system/status_codes.h"
+
+typedef struct SettingsFile SettingsFile;
+
+
+//! Initialize the persist service.
+void persist_service_init(void);
+
+//! Lock and get the persist store for the given app.
+SettingsFile *persist_service_lock_and_get_store(const Uuid *uuid);
+
+//! Unlock the given persist store.
+void persist_service_unlock_store(SettingsFile *store);
+
+//! Call during each process's startup.
+void persist_service_client_open(const Uuid *uuid);
+
+//! Call once after proces exits to clean it up.
+void persist_service_client_close(const Uuid *uuid);
+
+//! Deletes the app's persist file.
+status_t persist_service_delete_file(const Uuid *uuid);