What is a critical section and how is it implemented?
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Answer Posted / somu
Critical Section:-
In concurrent programming a critical section is a piece of
code that accesses a shared resource (data structure or
device) that must not be concurrently accessed by more than
one thread of execution. A critical section will usually
terminate in fixed time, and a thread, task or process will
only have to wait a fixed time to enter it. Some
synchronization mechanism is required at the entry and exit
of the critical section to ensure exclusive use.
for example a printer, can only be accessed by one process
at a time.
Example Code For Critical Sections with Win32 API: -
#include <windows.h>
CRITICAL_SECTION cs; /* This is the critical section
object -- once initialized, it cannot
be moved in memory */
/* Initialize the critical section -- This must be done
before locking */
InitializeCriticalSection(&cs);
/* Enter the critical section -- other threads are locked
out */
EnterCriticalSection(&cs);
/* Do some thread-safe processing! */
/* Leave the critical section -- other threads can now
EnterCriticalSection() */
LeaveCriticalSection(&cs);
/* Release system object when all finished -- usually at
the end of the cleanup code */
DeleteCriticalSection(&cs);
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