I am trying to convert the following java statement of threads in go;
int num = 5;
Thread[] threads = new Thread[5];
for (int i = 0; i < num; i++)
{
threads[i] = new Thread(new NewClass(i));
threads[i].start();
}
for (int i = 0; i < numT; i++)
threads[i].join();
I wanted to know, how to convert this to go?
Thanks
Golang uses a concept called "goroutines" (inspired by "coroutines") instead of "threads" used by many other languages.
Your specific example looks like a common use for the sync.WaitGroup
type:
wg := sync.WaitGroup{}
for i := 0; i < 5; i++ {
wg.Add(1) // Increment the number of routines to wait for.
go func(x int) { // Start an anonymous function as a goroutine.
defer wg.Done() // Mark this routine as complete when the function returns.
SomeFunction(x)
}(i) // Avoid capturing "i".
}
wg.Wait() // Wait for all routines to complete.
Note that SomeFunction(...)
in the example can be work of any sort and will be executed concurrently with all other invocations; however, if it uses goroutines itself then it should be sure to use a similar mechanism as shown here to prevent from returning from the "SomeFunction" until it is actually done with its work.