A data race condition is a situation where two or more running elements, such as threads and goroutines, try to take control of or modify a shared resource or a variable of a program. Strictly speaking, a data race occurs when two or more instructions access the same memory address, where at least one of them performs a write operation. If all operations are read operations, then there is no race condition.
Using the -race flag when running or building a Go source file will turn on the Go race detector, which will make the compiler create a modified version of a typical executable file. This modified version can record all access to shared variables as well as all synchronization events that take place, including calls to sync.Mutex and sync.WaitGroup. After analyzing the relevant events, the race detector prints a report that can help you to identify...
