Skip to main content

Example 2 – Tasking in ADA

task ALARM is

entry AWAKE;

task body ALARM is

begin

loop

select

accept AWAKE;

or

delay 50.0;

SIGNAL_ALARM;

end select;

end loop;

end ALARM;


 

The above code shows that whether an operator is awake or not. If the operator is awake, then the AWAKE button is pressed every 50 sec. if not, the after a delay of 50 seconds, an ALARM will be sounded indicating the operator is away or AWAKE button is not pressed.

If the operator pressing the AWAKE button at 0 seconds or even at 49 seconds, the SIGNAL_ALARM procedure wont be executed at all. because the AWAKE button should be pressed once every 50 sec.

Comments

Popular posts from this blog

Implementing a new system call in Kernel version 2.6.32

A system call is used by application or user programs to request service from the operating systems. Since the user programs does not have direct access to the kernel whereas the OS has the direct access. OS can access the hardware through system calls only. The following files has to be modified for implementing a system call /usr/src/linux-2.6.32.5/arch/x86/kernel/syscall_table_32.S /usr/src/linux-2.6.32.5/arch/x86/include/asm/unistd_32.h /usr/src/linux-2.6.32.5/include/linux/syscalls.h /usr/src/linux-2.6.32.5/Makefile New set of files to be created Create a new directory newcall/ inside the path “ /usr/src/linux-2.6.32.5/ ” Create new files Makefile, newcall.c and put them in the /usr/src/linux-2.6.32.5/newcall/ folder Create new user files (in any folder of Linux) to test the system call testnewcall.c, testnewcall.h (created in /home/pradeepkumar ) syscall_table_32.S Find the file /usr/src/linux-2.6.32.5/arch/x86/kernel/syscall_tab

How to Access MOODLE in Intranet and Internet

When Moodle is accessed either in Intranet or internet, there will not be any issue. But occasions when the MOODLE Site has to be accessed both in the intranet and in the Internet, here is a simple trick Server Used: IBM Blade Servers Operating system: Windows Server 2008 Moodle Version: 2.4 WAMP Server is used. Number of Users: 3000 (Students) + 200 (Faculty) Open the config.php from ~/moodle/config.php include these lines $CFG->wwwroot = 'http://'.$server_id.'/vitcc'; $CFG->dataroot  = 'C:\\wamp\\moodledata'; before the following line $CFG->directorypermissions = 07xx; Restart the WAMP Server and you can Check MOODLE Site both in Internet and Intranet. The above Image tells the intranet Link and the internet link can be opened outside the campus network

Electrical Machine Design (equations)

Factors DC Machine Transformers Induction Machines Synchronous Machines Output Equation P a =C o D 2 Ln, where Pa=P/h for generators, Pa=P for motors For Single Phase Q=2.22 f B m A i K w A w d 10 -3 For Three Phase Q=3.33 f B m A i K w A w d 10 -3 Q=C o D 2 L n s KVA Input Q= HP * 0.746 / Cos f * h Q=C o D 2 L n s KVA Input Q= HP * 0.746 / Cos f * h For Turbo alternators Q=1.11B av ac K ws V a 2 L 10 -3 /n s Output Coefficient C o =B av ac* 10 -3 where Bav-magnetic loading and ac - electric loading DNA C o =11 K ws B av ac 10 -3 C o =11 K ws B av ac 10 -3 Choice of Magnetic Loading Flux Density in Teeth Frequency of Flux Reversals Size of machine DNA Magnetizing current, Flux Density, Iron loss Iron loss, Stability, Voltage Rating, Parallel Operation, Transient ShortCircuit current