critical area; critical region
Computing term for a section of code or data that must be accessed by only one process at a time to avoid race conditions.
In multithreaded programs, critical areas must be properly protected.
Synonymous loanword from English 'critical section', commonly used in technical documentation alongside 危険領域.
Compound of 危険 (danger) and 領域 (area, region), likely a calque of English 'critical area' in computing contexts.