Threads

A thread of execution is the smallest unit of processing that can be scheduled by an operating system. The execution of threads and processes vary from one operating system to another. In most cases, a thread is comprised inside a process. Multiple threads exist under the same process and share resources such as memory. These resources were shared by different processes. In peculiar, the threads of a process share the latter are code and its context. Multiple threads in a process are like multiple cooks reading from the same cook book and following the instructions, but not necessarily from the same page.

Multithreading

Multithreading allows multiple threads to exist within the context of a single process. These threads share the resources of process but execute independently. The threaded programming model offers a useful abstraction of concurrent execution to the developers. Even so, the most important application of the technology is when it is employed to a single process to allow parallel execution on a multiprocessor system.

This reward of a multithreaded program offers it to operate more quickly on computer systems that have multiple CPUs or CPUs with multiple cores or throughout a cluster of machines. This is because the threads of the program normally contribute themselves to truly simultaneous execution. Threads may require mutually exclusive processes to keep common data from being at the same time modified or read while in the process of being modified. Careless utilization of such primitives can lead to deadlocks.

多线程的重要性：

To make better execution of an application.

Threads contribute the same address space so it saves the memory.

上下文t之间的交换hreads is usually less expensive than between processes.

线程之间的通信价格相对较低。

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