CODEWITHSUNDEEP
windowswinapi
user382591
user382591

Reputation: 1390

Is EnumWindows thread safe

I have a very basic question : is EnumWindows thread safe ?

http://msdn.microsoft.com/en-us/library/windows/desktop/ms633497(v=vs.85).aspx

Thanks

Upvotes: 2

Views: 657

Answers (2)

Hans Passant
Hans Passant

Reputation: 942119

Not in the main thread. That was my question

Some functions from user32.dll are thread-sensitive, you can dig yourself a pretty deep hole if you call, say, SendMessage() for a custom message on a worker thread. But no, EnumWindows() has no such problem, it doesn't care whether the thread is pumping a message loop and does not rely on thread state. You do of course need to account for the possibility that the window handle you get in the callback might be for a window that was destroyed just a fraction of a second earlier, EnumWindows() does not freeze every thread of every process that created a window.

Upvotes: 3

David Heffernan
David Heffernan

Reputation: 613412

You can call EnumWindows safely from any thread. As a general rule, Windows API functions are thread safe. Exceptions to this general rule will be sign posted in a function's documentation.

Upvotes: 3

Related Questions