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C# Unsafe Thread Monitoring?
How does the Monitoring class solve the unsafe thread problem in the following example:
class ThreadUnsafe {
static int val1, val2;
static void Go(){
if (val2 != 0) Console.WriteLine( val1 / val2);
val2=0;}
}
Monitor class I should say.
1 Answer
- ?Lv 56 years ago
The variable val2 is not local to the function Go(). So if more than one thread calls Go you could get a division by 0. For example:
Thread 1: Does the test "if(val2 != 0)" but then it gets swapped out, and
Thread 2: Is started, calls Go(), does the if, the write, and sets val2=0. Then Thread 2 gets swapped out and
Thread 1 is restarted, it goes to do the "Console.WriteLine(val1/val2)" but since Thread 2 set val2 to 0, it gets a divide by 0 fault.
