Run NSTask synchronously - objective-c

Question

I have an .app file that I'm running through NSTask and I wish the thread to be blocked till .app execution is over.
My current code is:
NSTask *task = [[NSTask alloc] init];
task.launchPath = #"/bin/bash";
task.arguments = [NSArray arrayWithObjects:#"-c", "/usr/bin/open myApp.app", nil];
[task launch];
[task waitUntilExit]; // doesn't guarantee task will wait until exit according to docs
I know I can use NSTask.terminationHandler but since I have a lot of tasks I don't want to get into a callback hell situation (and also I don't care if everything will run sync and take some time)
(I also tried adding nohup to the execution command but it didn't made the affect i wanted.)
Is there a way to execute NSTask synchronously and wait until execution is over?

Answer 1

It seems that the problem was in the open command which executes the app and return context even if execution is not over.
I found out that open has a -W argument:
-W, --wait-apps Blocks until the used applications are closed (even if they were already running).
adding this argument solved my problem.
final code:
NSTask *task = [[NSTask alloc] init];
task.launchPath = #"/bin/bash";
task.arguments = [NSArray arrayWithObjects:#"-c", "/usr/bin/open -W myApp.app", nil];
[task launch];
[task waitUntilExit];