Normally, write will block until it has written all of the data to the file.
Let me just point out a few facts: You can actually make UI calls all you want if you set Control.
The control classes in System. Forms are not written to be thread-safe, so sometimes updating them from background threads can corrupt memory.
But if this only sometimes happens and not always, what this tells me is that it is not the calling of UI code per se, but rather the potentially unsafe collision of UI code that can cause exceptions.
To reinforce point 1, consider this: Keeping the above two points in mind, ask yourself: Show from a non-GUI thread? A completely separate Form is created and displayed; its properties do not in any way interact with any other existing GUI object; in fact, it cannot be accessed anywhere in any manner, except for one: In any case, a peek at the MessageBox.
Show method through Reflector reveals this snippet: BeginModalMessageLoop method reveals this: Show automatically marshall to the UI Thread? I am totally in agreement with MUG4N on this one. If anyone can convincingly argue that I am still mistaken here, please speak up.
In this common scenario, I sometimes see code like this: OK ; This code, as we all know, causes a little pop-up window to appear with only an OK button. Obviously I could just write my own little form that does basically exactly what MessageBox.Event-driven, non-blocking I/O with PHP.
ReactPHP is a low-level library for event-driven programming in PHP. At its core is an event loop, on top of which it provides low-level utilities, such as: Streams abstraction, async DNS resolver, network client/server, HTTP client/server and interaction with processes.
Long-delayed update I'm accepting MUG4N's answer to this question, and I also want to respond to some of the criticisms that were raised . Non-blocking I/O with regular files. Every now and them, I hear some programmer complain that a given piece of code uses blocking I/O.
The claim is typically that blocking I/O damages the responsiveness of applications, especially if it has a user interface.
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The code snippet above will configure such a descriptor for non-blocking access. If data is not available when you call read, then the system call will fail with a return value of -1 and errno is set to EAGAIN.
Notice that applying volatile doesn’t prevent a write followed by a read from being swapped, and this can create brainteasers. Joe Duffy illustrates the problem well with the following example: if Test1 and Test2 run simultaneously on different threads, it’s possible for a and b to both end up with a value of 0 (despite the use of volatile on both x and y).