pl quiz concurency

monitor

a synchronization method which is an abstract data type used in concurrent programming to manage shared data that encapsulates the shared data and its operations to restrict access

heavyweight task

a task category which is a task that executes in their own isolated address space, they do not share memory with others

how is logical concurrency achieved

it is achieved by timesharing a lone processor, in which it may look like there were multiple threads of control, but it switches quickly between tasks

task vs subprograms

1. it may be implicitly started without a direct function call

2. a program doesnt have to wait for a task to finish

3. when a task is completed, control may not return to caller

Competition synchronization

• it is two or more tasks that must use a resource that cannot be simultaneously used, it is needed to avoid conflicts or corruption when reading/writing data

semaphore

it is a data structure consisting of a counter and a queue for storing task descriptor, it controls who can go, who has to wait, and in what order to ensure order in concurrent systems