Comments by tuccio - CodeProject

tuccio 24-May-11 7:54am View

well i made the assumption that no one is going to grab the lock, because i've a std::map containing locks and i access this map in mutual exclusion, so, while i've the lock on the map, no one is going to grab it, because no one can access it (i know this sounds weird and inefficient, but it's the easiest solution i've found, and i've not requirements of efficience)

of course this map mutual exclusion implies no one can access waiting variabile, so this is a kind of interlocked increment too

my point is that i've this std::map<ino_t,> to lock files on a thread base, i add locks to this map when i request lock for the file, but i need a condition to remove them safely, to avoid the map being full of useless locks

tuccio 3-Apr-11 9:20am View

you should ask my professor :D

i see you're italian, so i just paste: "Non e' consentito cioe' accesso ne' in lettura ne' in scrittura da parte di altre istanze del server tftp allo stesso file mentre il file viene scritto."

i'm expressly required to do so :/

tuccio 2-Apr-11 17:13pm View

because i'm expressly required not to allow multiple server instances to access the same files when one of them is writing

maybe i could find a way to combine flock and rwlocks safely

tuccio 2-Apr-11 12:32pm View

ok, i've been told i should use an allocator, but that looks complicated to be honest

tuccio 2-Apr-11 7:10am View

well.. how? i mean, and how can i be sure that no memory will be allocated out of my data segment? i guess that any "new" would be a problem, isn't it?

tuccio 1-Apr-11 19:15pm View

Well, maybe i could do this, but i was wondering.. can i allocate a std::map on a shared memory segment i get with shmget, or i need to implement my own data structure?

tuccio 1-Apr-11 19:13pm View

Deleted

i was wondering.. can i allocate a std::map on a shared memory segment or i have to make my own data structure?

tuccio 1-Apr-11 16:15pm View

pthread's rwlocks and mutexes require processes to share memory in order to work, that doesn't look simple to be honest

also that would require me to identify files on the filesystem, and mapping them with their own rwlock.. so i'd need a data structure to manage these locks, wouldn't i? or maybe i'm making it too complicated?

Comments by tuccio (Top 8 by date)