Answer / 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);

Answer / umesh

Critical Section allows you to explicitly lock any resources so that untill u release the lock no body else can able to access it. Resource can be any thing. for example a variable, or a piece of code..

We can use Either CRITICAL_SECTION structure with the help of EnterCriticalSection and LeaveCriticalSection APIs.
Or MFC wrapper, CCriticalSection type variable. which gives u lock and unlock mechanism

How do you change the properties for a tree view control that is part of the CTreeView class?

1 Answers  

---

Difference between Debug and Release versions?

4 Answers  

---

What is the difference between the ASSERT and VERIFY macros?

4 Answers  

---

Hi can anyone explain about the synchronization objects types and where we are using in the code.

1 Answers  

---

What is CALLBACK? How it work? what is the advantage of CALLBACK, please explain with an example

6 Answers  

---

visual Pogramming c++ coding for create a paint application.. (Please someone help me)

2 Answers  

---

What is the difference between the Encapsulation and Abstraction

25 Answers   HCL, Invensys, TCS, Wipro,

---

Q1. A. What is unary operator? List out the different operators involved in the unary operator. B. What is an adjust field format flag? Q2. A. Distinguish between a # include and #define. B. Can a list of string be stored within a two dimensional array? Q3. A. Explain how a pointer to function can be declared in C++? B. List the merits and demerits of declaring a nested class in C++? Q4. A. What are the syntactic rules to be avoid ambiguity in multiple inheritence? B. Explain the operation of overloading of an assignment operator. Q5. A. Explain how the virtual base class is different from the conventional base classes of the opps. B. Explain how an exception handler is defined and invoked in a Program. Q6. A. What is a binary file? List the merits and demerits of the binary file usagein C++. B. Write short notes on Text Manipulation Routines. C. Write bites in Turbo c++ Header ("Include") Files.

3 Answers   ABC, HCL, Infosys,

---

Psychic Window Technique

2 Answers   E Logic, Wild Net,

---

How to handle command line arguements from simple MFC application ?

2 Answers   TCS,

---

Which MFC function is used to display output?

9 Answers   TCS,

---

if both base and derived class have the constructors if i create an object for derive class which class constructor is executed first

10 Answers   Siemens, Symphony,

---