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Is the next thread safe? 4 streams that are written to the same data structure

So, let's say I have 4 threads, and they all go through an array with 100 indices, flipping a bit of information in each index and writing back that index ...

arr[];

Thread 1:

for (int i = 0; i< 100; i+=4) { flip bits of arr[i]}

Thread 2:

for (int j = 1; j< 100; j+=4) { flip bits of arr[j]}

Thread 3:

for (int k = 2; k< 100; k+=4) { flip bits of arr[k]}

Thread 4:

for (int l = 3; l< 100; l+=4) { flip bits of arr[l]}

I'm a complete noob in concurrency, so I was wondering if this was good practice or was there another way to do this?

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