NSOperation是基于Object-C封装的一套管理与执行线程操作的类。这个类是一个抽象类,通常情况下,我们会使用NSInvocationOperation和NSBlockOperation这两个子类进行多线程的开发,当然我们也可以写继承于NSOperation的类,封装我们自己的操作类。 1、NSOperation抽象类中提供的逻辑方法 操作开始执行 代码语
NSOperation
We're going to implement Queue using array in this article. There is few more operations supported by queue which are following.Peek − get the element at front of the queue. isFull − check if queue is full. isEmpty − check if queue is empty.Insert / Enqueue Operation...
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operation object leaves the object in the queue but notifies the object that it should abort its task as quickly as possible. For currently executing operations, this means that the operation object’s work code must check the cancellation state, stop what it is doing, and mark itself as ...
Dequeue Operation check if the queue is empty return the value pointed byFRONT increase theFRONTindex by 1 for the last element, reset the values ofFRONTandREARto -1 Enqueue and Dequeue Operations Queue Implementations in Python, Java, C, and C++ ...
OperationQueue(操作队列,api 类名为 NSOperationQueue )是 Objective-C 对象,是对 GCD 的封装。其作用非常类似于分派队列。您定义要执行的任务,然后将它们添加到 OperationQueue 中, OperationQueue 处理这些任务的调度和执行。与 GCD 一样, OperationQueue 为您处理所有线程管理,确保在系统上尽可能快速有效地执行任...
999 non standard linked in error A blocking operation was interrupted by a call to WSACancelBlockingCall A call to PInvoke function has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. (.NET 4) A callback was made on a...
in shared state. Since a queue write operation needs to read the head index it's likely that a write operation requires some cache coherency traffic to bring the head index cache line back into exclusive state. In the worst case there will be one cache line transition from shared to ...
The elements are copied onto the Queue<T> in the same order they are read by the IEnumerator<T> of the collection. This constructor is an O(n) operation, where n is the number of elements in collection. Examples The following code example demonstrates this constructor and several other met...