C# Array 2 threads read same item at same time

Question

If I have the following 2 for loops that will be run on different threads:

for (int ii = 1; ii < times.Length; ii+=2)
{
     if (times[ii] - times[ii - 1] > maxGap)
     return false;
}

for (int ii = 2; ii < times.Length; ii += 2)
{
      if (times[ii] - times[ii - 1] > maxGap)
      return false;
}

The situation could occur where both threads try to read from an item in times Array eg both threads could try and read times[1] at the same time.

Given that both threads will only ever read from these arrays, is this a problem eg could it cause my code to crash or any other unexpected negative consequences?

No. If it is read-only, then there is no problem (of course given no other thread will write, etc.). One two writes or read-write combos will cause troubles. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Jul 30, 2017 at 13:15

Chandrasekhar Raman · Accepted Answer · 2017-07-30 13:15:31Z

4

If only read operation is performed then there won't be a problem. Read and write operation together can cause a problem.

answered Jul 30, 2017 at 13:15

Chandrasekhar Raman

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1 Comment

Tanveer Badar Over a year ago

It is the shared writes which cause problems. Multiple readers are always safe. Multiple writers if they are writing to non-overlapping ranges are also safe.

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