Filedescriptors create files at construction, each later access becomes
a reopen on the now existing file.
file_handle_acquire() reopens the file to gain a handle when required
and checks that the file is really the one we expected (ino and dev num)
* add 'backend' for backend global initialization/destruction
and common functions.
* WIP: 'file' acts as interface to named files, provides posix
filehandles with and acquire/release function pair.
* 'filehandle' manages posix filehandles internally, refcounted.
* WIP: 'filehandlecache' keeps unused filehandles in a MRU cache
* WIP: test for filehandle management
* improved filedescriptor test
* make registry initialization singleton, no parameters.
* remove registry init from all functions, has to be called explicitly.
* some nobug improvements
It is now possible to acquire/release filedescriptors for existing files
and files to be created.
Filedescriptors are managed in a registry by refcounts, they get
automatically destructed when the last user releases them.
We have 'File' which associates a name with a file and will be used to
offer an interface for the application.
Posix 'Filehandles' which are managed in a 'Filehandlecache' to utilize
a limited number of fd's at optimum.
Internally we use 'Filedescriptor's which manage files, mapping and all
kinds of metadata. Filedescriptors weak referenced by a registry and freed
when the last user vanishes.
LUMIERA_MUTEX_SECTION takes now a nobug flag as first argument and
a nobug resource-handle as second argument.
This change works forward for the NoBug resource tracker and
deadlock detector.
* GNU_SOURCE by default now
* improved use of ACX_PTHREAD, replaces $CC and others
* all checks for mandatory things instantly exit for now
in future this might produce an report at the end
* ported checks from scons over here
This implementation of cuckoo hashing gives guaranteed O(1)
lookup complexity and amortized O(1) insert and remove complexity.
Hash tables by default grow and shrink automatically.
It is posible to preallocate entries and turn automatic shrinking off,
taking out the memory management factors for insert and remove operations.
