0 indicates not supported.

Returns the number of nano-seconds since some fixed point in time. Only useful for computing deltas of time in one run. Default implementation simply

Returns the number of nano-seconds since some fixed point in time. Only useful for computing deltas of time in one run. Default implementation simply

Poll for completion of read IO requests. The Poll() method should call the callback functions to indicate completion of read requests. Underlying FS i

Positioned Read for direct I/O If Direct I/O enabled, offset, n, and scratch should be properly aligned

Positioned Read for direct I/O If Direct I/O enabled, offset, n, and scratch should be properly aligned

Readahead the file starting from offset by n bytes for caching.

Readahead the file starting from offset by n bytes for caching. If it's not implemented (default: `NotSupported`), RocksDB will create internal prefet

PrepareWrite performs any necessary preparation for a write before the write actually occurs. This allows for pre-allocation of space on devices wher

PrepareWrite performs any necessary preparation for a write before the write actually occurs. This allows for pre-allocation of space on devices wher

Sync a file range with disk. offset is the starting byte of the file range to be synchronized. nbytes specifies the length of the range to be synchron

Sync a file range with disk. offset is the starting byte of the file range to be synchronized. nbytes specifies the length of the range to be synchron

This API reads the requested data in FSReadRequest asynchronously. This is a asynchronous call, i.e it should return after submitting the request. Wh

Invokes the registrar function with the supplied arg for this library.

See FileSystem::RegisterDbPaths.

Release a mapping returned by a previous Lookup(). The "useful" parameter specifies whether the data was actually used or not, which may be used by th

Release a specific number of reserved threads from the specified thread pool

Create an object that writes to a file with the specified name. `WritableFile::Append()`s will append after any existing content. If the file does no

Create an object that writes to a file with the specified name. `FSWritableFile::Append()`s will append after any existing content. If the file does

Check for any warnings or errors in the operation of the cache and report them to the logger. This is intended only to be called periodically so does

Reserve available background threads in the specified thread pool.

Equivalent to Rotate(), but requires the second arg to be non-zero. On x86-64, and probably others, it's possible for this to compile to a single inst

Sanitize the FileOptions. Typically called by a FileOptions/EnvOptions copy constructor

Set the maximum configured capacity of the cache. When the new capacity is less than the old capacity and the existing usage is greater than new capac

* If rate limiting is enabled, change the file-granularity priority used in * rate-limiting writes. * * In the presence of finer-granularity

* Get and set the default pre-allocation block size for writes to * this file. If non-zero, then Allocate will be used to extend the * underlyi

* Get and set the default pre-allocation block size for writes to * this file. If non-zero, then Allocate will be used to extend the * underlyi

Continue with a different XOR key */

Indicates to upper layers which FileSystem operations mentioned in FSSupportedOps are supported by underlying FileSystem. Each bit in supported_ops ar

Arrange to remove jobs for given arg from the queue_ if they are not already scheduled. Caller is expected to have exclusive lock on arg.

See FileSystem::UnregisterDbPaths.

Wait for all threads started by StartThread to terminate.

Return a new set based on this one with the additional value(s) inserted

we roll our own

allocates, but does NOT initialize. Use in-place new constructor, e.g. T* obj = pool.allocate(); ::new (static_cast<void*>(obj)) T();

! @brief appends a decimal representation of e to buf @return a pointer to the element following the exponent. @pre -1000 < e < 1000 */

Used internally in one branch when parsing Legacy. If it fails it will clear the address to default constructed values.

Zero constructor