Writing to and reading from an array at the same time

[vasiqshair]

Would that be possible? Say, data is being written to an array "arr" from a file AND data is being read from the array "arr" into another file at the same time, literally. In general, can you call two functions at the same time?

[rapidcoder]

Yes, it is possible, however, generally it is a bad idea that two concurrent functions directly access common read-write data. What do you need that for?

[Tanatos]

I suggest you put that array in an object of some class and then add functionality to that class so that you can get some restrictions when to read/write to the array. For example you can use methods for push()-ing and pop()-ing elements out of the array. I also suggest lock() / unlock() methods so you can prevent the array from changes when you feel such would be harmful for it.
In general it's a bad idea to read and write to a common data at the same time. You can run into endless loops like:

while(you haven't reached the end) read current value and append it at the end

and other nasty stuff.

[zb0S216C]

In order to perform a read and write operation simultaneously, you need threads. Also, you would require a mutex^[1] (if you're using threads), which protects a section of resources while a thread read/writes to it.

References:
^[1]http://en.wikipedia.org/wiki/Mutual_exclusion

_Wazzak

[vasiqshair]

I am trying to simulate Process Synchronization, wherein two threads/processes would be able to access the array simultaneously and I would employ semaphores in order to synchronize the execution of the processes.