© Thomas Kunz 2000
SCE 574
205
The Critical Section Problem
äWhen a process executes
code that manipulates shared data (or resource), we say that the
process is in it’s critical
section (CS) (for that shared data)
äThe execution of
critical sections must be mutually
exclusive: at any time, only one process is allowed to execute in its
critical section (even with multiple CPUs)
äThen
each process must request the permission to
enter it’s critical section (CS)