Ways to implement. The Q_GLOBAL_STATIC macro creates an object that initializes itself on first use in a thread-safe manner: if multiple threads attempt to initialize the object at the same time, only one thread will proceed to initialize, while all other threads wait for completion. A class whose members are protected from such interruptions is called thread-safe. Denn statische Variablen verlieren bei Beendigung ihres Bezugsrahmens (also bei Beendigung der Funktion) nicht ihren Wert, sondern behalten diesen bei. Where a method is marked as static, then there is only ever once instance of it, but even then each thread gets its own copy of local variables. It is the job of the programmer to guarantee this won't happen. ... an uninitialized variable. All objects with static storage duration must be initialized (set to their initial values) before execution of main() starts. What you see here is not a compiler bug. ... To synchronise static methods, we need to lock the private static object variable. A normal or auto variable is destroyed when a function call where the variable was declared is over. So keep this in mind: such code is not thread safe - you can not assume that in the presence of multiple threads the function static variable will be constructed only once. As your webmethods are in classes, each call will be creating a new instance of your class. So a value which is not known at translation time cannot be used for initialization of static variables. In your example this is perfectly thread safe. In the .NET Framework, there are many primitives available that you can use to make synchronized calls to shared data. Unlike local variables and static variables, a global variable is not declared inside a function.. Properties of a global variable. Thread safety is a computer programming concept applicable to multi-threaded code. Thread-safe code only manipulates shared data structures in a manner that ensures that all threads behave properly and fulfill their design specifications without unintended interaction. Even if varialble is protected b a lock and is thread safe, performance may become worse since multiple threads may end up waiting on the lock. This is the main point I wanted to make in this post. static . Dies haben Sie dem Schlüsselwort static zu verdanken. Deshalb stellt der C-Standard einige Operatoren zur Verfügung, mit denen man das Verhalten einer Variablen weiter präzisieren kann. In either case you only have to worry if your method is accessing global/static variables. static data_type var_name = var_value; Following are some interesting facts about static variables in C. 1) A static int variable remains in memory while the program is running. Generally it is better to avoid designs where multiple threads may be writing into the same variable. scoped static initialization is now thread-safe, but it comes with a cost: Reentrancy now invokes undefined behavior.] The rule for static variables at block scope (as opposed to static variables with global scope) is that they are initialized the first time execution reaches their declaration. Damit werden für die Variable i tatsächlich die Werte 1, 2 und 3 ausgegeben. Manchmal reichen einfache Variablen, wie sie im vergangenen Kapitel behandelt werden, nicht aus, um ein Problem zu lösen. In this article, I will explain the local static and global variables in C. Basically variable defines a location name where you can put value and you can use these value whenever required in the program. A static field marked with ThreadStaticAttribute is not shared between threads. Global variables are variables declared outside a function. 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