In short: it is almost certainly unsafe to run your code in a signal handler, and it will deadlock sometimes. However, since it can be delivered at any time, it still will be subject to async safety issues, even thought it is not a crash. Now, I will admit that my experience with signals does not include use of SIGTERM. But, will also sometimes deadlock, depending on what the thread was doing at the time. Calling unsafe functions, like NSLog, will sometimes work. If you check out "man sigaction" (note, sigaction is a much improved API over signal) you see that there are actually a very small number of functions that are safe to call from a signal handler. This is an part of a class of problems known as "async safety". Examples of things that hold locks - malloc/free, the Objective-C runtime. Second, signals interrupt a thread, and that thread can be doing anything, including holding locks. There are other, legitimate uses of signals, and installing handlers will negatively impact their behavior without very careful work. Unfortunately, there are, in fact, some major issues with the suggested approach.įirst, signal handlers are per-process. Hold down the Option key on your keyboard.įrom the File menu, select Close All, as shown below.Major credit goes to for putting work in here to come up with an answer. Here’s how to close all windows in a Mac application using a menu item: If you don’t want to use the keyboard shortcut, you can also use a menu item to close all windows on your Mac. To close all windows in an application on your Mac, press the Command, Option, and W keys, as shown below. Closing All Windows Using a Keyboard Shortcut When working on Macinstruct or taking screenshots for documentation, I can easily end the day with hundreds of windows open in the Preview application.įortunately, there’s a quick and easy way to close all of the windows in Mac application at once, without having to close each window one by one. The Preview application is my personal favorite. When you’re working in the Finder or a Mac application, the open windows can start to pile up. How to Close All Windows in a Mac Application.AirPort Apple Apps Backups Developer Education Email Hardware Internet iPad iPhone Mac Music Network Photos Security TV Weekend Wonk
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