lib: Add file_lock_from_dotlock() The dotlock creation requires various settings, so the file-lock.h API can't easily be used to create it. But once created, it's simpler to keep all lock types in the same struct file_lock, which can be unlocked/freed once finished.

lib: file_lock_set_unlink_on_free() - Avoid unlink() if another process is waiting on the lock

lib: Add file_lock_set_close_on_free()

lib: Add file_lock_set_unlink_on_free()

lib: Add file_lock_set_path()

lib: Add file_lock_get_path() This allows getting the file path from the lock without having to preserve it separately.

lib: Add FILE_LOCK_SLOW_WARNING_MSECS environment. Log a warning if any locking takes longer than the specified number of milliseconds. This can be enabled globally with: import_environment = $import_environment FILE_LOCK_SLOW_WARNING_MSECS=1000

lib: Track how much time has been spent on waiting for locks.

lib: file_lock_try_update() comment updated. It should possibly be removed entirely from the API.

lib: Added file_lock_find() to find which process has a file locked.

lib: Added file_wait_lock_error() and file_try_lock_error()

Added file_lock_method_to_str()

Moved file lock type string parsing code to file-lock.c --HG-- branch : HEAD

Changed .h ifdef/defines to use <NAME>_H format. --HG-- branch : HEAD

Lock handling changes. Everything goes through file-lock API now and there's only a single enum listing the different lock methods. This change exposed some unneeded (or possibly even wrong?) unlock calls in index file handling which were fixed. --HG-- branch : HEAD

Naming change for function typedefs. --HG-- branch : HEAD

Locking changes triggered a bit larger cleanup :) If we have to wait for a lock longer, the client is now notified about it every 30 seconds. Also if mailbox opening fails because of lock timeout, we won't overwrite the index anymore. Finally user gets a clear error message about lock timeout instead of "internal error". --HG-- branch : HEAD

file_wait_lock() now takes timeout-parameter so one badly behaving process won't start creating tons of lock-waiting processes. --HG-- branch : HEAD

lots of cleanups. also index/datafile is now capable of staying in memory, as long as it's noticed while opening the index. --HG-- branch : HEAD