Async actions using same functions 1

[ecucurella]

Hi,

I have found a curious problem working with asyncronous call of methods !!

I will try to explain you:

- I have a class(Grib) that implements a function(GetNearData) that read some information(temperature data) in some positions in a file(from Latitude/Longitude).

- How I have to do too many read from so many files I have done 20 objects at the same time doing work and calling it trough the IAsyncResult interface

- The call to this method return by ref the data required

- The surprise was that if two objects use the same method to retrieve diferent data of the same file at the same time !! >> data returned was the same !!

There is any way to protect this error to be produced?

Thanks in advance,

cucu

 

[Mastakilla]

Hi,

you could try setting a boolean variable like "FileAvailable" then only read from it if "True", Set it to False just before starting reading it and back to True when you've finished reading it.

 

[chrissie1]

try synclock

Christiaan Baes
Belgium

"My new site" - Me

 

[ecucurella]

Hi,

Ok, this is a good solution but it could be possible that both objects looks at this variable and see that FileAvaliable=True then both set it to False and start the reading atr same time with same problem?

Who assures me that this will not happens?

I was searching another solution more polite if it exist, anyone knows it?

Thank you,

 

[chrissie1]

so synclock.

Christiaan Baes
Belgium

"My new site" - Me

 

[ecucurella]

ok, I'm looking at synclock and seams to be what i was looking for !!

Thank you

cucu