Using an array with multiple read streams + write

Question

I am not sure about that.

Using the array int []. If in my application stream A reads when stream B is written to the same array element, will everything be saved?

I would also prefer not to synchronize the block when reading - this is used in the web service, so I will not serve several clients in parallel.

Thank.

Olivie

Answer 1

No, you need to use a blocking block so that no one tries to read the array while some other process writes to it. Otherwise, you may have problems.

This is actually quite simple in C #, you can just do this:

// declare an object to use for locking
Object lockObj = new Object();

// declare the array
int[] x = new int[5];

// set the array value (thread safe operation)
public void SetArrayVal(int ndx, int val)
{
    if (ndx < 0 || ndx >= x.Length)
    {
        throw new ArgumentException("ndx was out of range", ndx);
    }    
    lock (lockObj )
    {
        x[ndx] = val;
    }
}

// get the array value (thread safe operation)
public int GetVal(int ndx)
{
    if (ndx < 0 || ndx >= x.Length)
    {
        throw new ArgumentException("ndx was out of range", ndx);
    }    
    lock (lockObj )
    {
        return x[ndx];
    }
}

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Answer 2

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Answer 3

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Answer 4

Arrays are not thread safe when reading and writing in streaming media: http://msdn.microsoft.com/en-us/library/system.array.aspx

You will need to block the array, t1.Join (); t2.Join () may work, although I'm not sure.

Answer 5

You need to block access to your array from multiple parallel threads. The easiest way is to allow access to your array using getters / seters, and then paste some lock code into it.