volatile 關(guān)鍵字指示一個(gè)字段可以由多個(gè)同時(shí)執(zhí)行的線程修改。聲明為 volatile 的字段不受編譯器優(yōu)化（假定由單個(gè)線程訪問(wèn)）的限制。這樣可以確保該字段在任何時(shí)間呈現(xiàn)的都是最新的值。

volatile 修飾符通常用于由多個(gè)線程訪問(wèn)但不使用 lock 語(yǔ)句對(duì)訪問(wèn)進(jìn)行序列化的字段。

volatile 關(guān)鍵字可應(yīng)用于以下類型的字段：

• 引用類型。

• 指針類型（在不安全的上下文中）。請(qǐng)注意，雖然指針本身可以是可變的，但是它指向的對(duì)象不能是可變的。換句話說(shuō)，您無(wú)法聲明“指向可變對(duì)象的指針”。

• 整型，如 sbyte、byte、short、ushort、int、uint、char、float 和 bool。

• 具有整數(shù)基類型的枚舉類型。

• 已知為引用類型的泛型類型參數(shù)。

• IntPtr 和 UIntPtr。

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The volatile keyword indicates that a field might be modified by multiple threads that are executing at the same time. Fields that are declared volatile are not subject to compiler optimizations that assume access by a single thread. This ensures that the most up-to-date value is present in the field at all times.

The volatile modifier is usually used for a field that is accessed by multiple threads without using the lock statement to serialize access.

The volatile keyword can be applied to fields of these types:

• Reference types.

• Pointer types (in an unsafe context). Note that although the pointer itself can be volatile, the object that it points to cannot. In other words, you cannot declare a "pointer to volatile."

• Types such as sbyte, byte, short, ushort, int, uint, char, float, and bool.

• An enum type with one of the following base types: byte, sbyte, short, ushort, int, or uint.

• Generic type parameters known to be reference types.

• IntPtr and UIntPtr.

The volatile keyword can only be applied to fields of a class or struct. Local variables cannot be declared volatile.

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http://msdn.microsoft.com/en-us/library/vstudio/x13ttww7(v=vs.100).aspx

轉(zhuǎn)載于:https://www.cnblogs.com/fengye87626/p/3835006.html

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