Review of Operating System Content and Operating System Content

Review of Operating System Content and Operating System Content

Thread: The thread is the execution unit in the process and the minimum unit for CPU allocation.

Components: thread stack and Kernel Object

The thread stack is the resource required to store threads.

The kernel object is a private block in the operating system. It is used to manage the current thread.

End mode: force-killing or natural exit

Exit multiple threads in the same process: Use a variable.

Exit of multiple threads in different processes: Cross-process operations can be performed using messages and events.

Thread status: Ready, executed, blocked, and killed

Inter-thread communication: Variable

Message

Thread Synchronization: To solve thread concurrency.

Synchronous method: Atomic access, using the keyword volitale

Critical section (key segment), normal mode or rotation lock, and asynchronous processing (synchronous and asynchronous)

Mutex (Kernel Object) features: the mutex is more secure. Cross-process, while the critical zone can only be in the same process

Event

Semaphores (with quantity control)