ftscloseFTS

ftscloseFTS is a library function used to terminate a full-text search (FTS) session or to close an FTS index, releasing resources such as memory, file handles, and locks. It is typically part of an FTS subsystem used by database engines or search libraries.

In typical implementations, it takes a single argument—the handle or reference to the FTS index instance—previously obtained from a corresponding open/initialize call (for example ftsopenFTS or ftsinit). The function may flush in-memory changes, commit any pending index updates, and ensure consistency on disk. It is designed to safely release resources and prevent further operations on the closed index.

Return value and errors: The function returns a status code or boolean indicating success; on failure it may set an error code and message to help diagnose issues such as a null handle, an index already closed, or I/O errors. Error handling often involves checking the return value and inspecting a separate error object or log.

Usage considerations: Do not use the handle after closing; ensure thread-safety when multiple threads may access the same index handle; in some environments closing may be synchronous and may block; in others it may schedule asynchronous cleanup. Proper usage typically includes closing only after all search or update operations are complete and after ensuring no further references will be used.

Example: result = ftscloseFTS(myIndex); if result indicates success, the index is closed; otherwise, errorDetail contains the failure message. Another consideration is to distinguish between a successful close and an idempotent close, where closing an already closed handle yields a non-error status.

See also: ftsopenFTS, FTS APIs, and database indexing.