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Only one process can execute in its critical section at a time.
Critical section. In simple terms a critical section is group of instructions statements or region of code that need to be executed atomically read this post for atomicity such as accessing a resource file input or output port global data etc. A critical section object provides synchronization similar to that provided by a mutex object except that a critical section can be used only by the threads of a single process. The entry to the critical section is handled by the wait function and it is represented as p.
Each process has a critical section where it changes common variables update tables write a table and so on. All the other processes have to wait to execute in their critical sections. The critical section is a code segment where the shared variables can be accessed.
A critical section is a segment of code which can be accessed by a signal process at a specific point of time. The portion of the program where the shared data variables or shared resources or shared data will be placed is called a critical section. Allowing the critical section to destruct with the lock still held results in undefined behavior.
The section consists of shared data resources that required to be accessed by other processes. An atomic action is required in a critical section i e. This protected section is the critical section or critical region.
It is expected that the lock is no longer held when the destructor runs. It is often safer to utilize the scoped lock construct to acquire and release a critical section object in an exception safe way. Critical section objects cannot be shared across processes.
A critical section will usually terminate in fixed time and a thread task or process will have to wait for a fixed time to enter it.
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