|Posted by Joseph Rushton Wakeling||PermalinkReply|
Suppose that I've got a foreach loop in which I write output to a file:
auto f = File("test.txt", "w"); f.close(); // to start with a blank file
foreach(i; iota(0, 100))
f = File("test.txt", "a");
I'm guessing it is at least potentially unsafe to parallelize the loop without also considering the file interactions:
foreach(i; parallel(iota(0, 100), 20))
f = File("test.txt", "a"); // What happens if 2 threads want to
f.writeln(i); // open this file at the same time?
... so, is there a way that I can ensure that the file appending takes place successfully but also safely in each thread? Let's assume that I don't care about the order of writing, only that it takes place.