Lowyat.NET: Latest topics by jenniferCT

problem with ext HDD

jenniferCT — Mon, 18 Jun 2007 10:41:35 +0800

I have this ext HDD, dont know why when I plug into my laptop, it cannot be detected....

The error state there is USB Device is not recognized.
One of the USB devices attached to this computer has malfunctioned, and Windows does not recognized it..

I dont know what's wrong and i had been trying so long, but still kenot be detected..Izzit because of the housing or internal??
Any ways so that i can retrieve my data back???

I need help in this....
Thank you....

hacked by godzilla

jenniferCT — Mon, 09 Apr 2007 17:20:44 +0800

my internet explorer got hacked by godzilla and
then whole pc hang
what is de problem???
any solution???

produce/consumer model how to design using C?

jenniferCT — Sun, 11 Mar 2007 17:58:18 +0800

I need help in C programming on how to design the produce/consumer model using semaphore.

Problem:

A gasoline station wants a program to model the delivery of gasoline from the producer and the dispensing
of gaselin by the consumers.The station is equiped with a storage tank that can be filled at a rate of 50 gallons
per second and can hold 1000 gallons of gaseline.10 pumps dispense gaseline at a rate of 5 gallons per second.
Any combination of pumps can be use in at the same time,each active pump can dispense different quantities of gaseline than
the other active pumps.When the storage reaches minimum quantity,the active pumps are taken off line and the storage tank is refilled
to its capacity.After the storage tank has been refilled,the active pumps are put back on line and continue pumping.The model displays
the starting,stopping and real-time activity is controlled by a constant(VERBOSE) with 1 indicating the real-time activity is displayed
and 0 indicating that real-time activity is not displayed.

Analysis :

The user must be able to enter the pump number and gaseline quantity at the same time that the producer is refilling the storage tank and
other pumps are active,which means that you need one thread to query the user for the pump number and gaseline quantity inputs,one thread
for producer refilling the storage tank when the inventory reaches the minimum quantity,one thread for each active pumps.The user inputs thread
can run in the main function,but the producer thread and the consumer threads will each need their own function.

Design:

1.initialize terminate,inventory,pump[] quantities and number
2.initialize mutex lock
3.launch producer thread
4.while the pump number is not -1
4.1 get the pump number
4.2 if the pump number is not -1 and the pump[number] is 0
4.2.1 get the pump amount and store it in the pump[number]
4.2.2 launch consumer thread
5.wait for active consumer threads to complete
6.set the terminate flag
7.wait for the producer thread to complete

Thank q!any clues?
or some tips?

Operating System

jenniferCT — Sun, 11 Mar 2007 17:53:54 +0800

I need help in C programming on how to design the produce/consumer model using semaphore.

Problem:

A gasoline station wants a program to model the delivery of gasoline from the producer and the dispensing
of gaselin by the consumers.The station is equiped with a storage tank that can be filled at a rate of 50 gallons
per second and can hold 1000 gallons of gaseline.10 pumps dispense gaseline at a rate of 5 gallons per second.
Any combination of pumps can be use in at the same time,each active pump can dispense different quantities of gaseline than
the other active pumps.When the storage reaches minimum quantity,the active pumps are taken off line and the storage tank is refilled
to its capacity.After the storage tank has been refilled,the active pumps are put back on line and continue pumping.The model displays
the starting,stopping and real-time activity is controlled by a constant(VERBOSE) with 1 indicating the real-time activity is displayed
and 0 indicating that real-time activity is not displayed.

Analysis :

The user must be able to enter the pump number and gaseline quantity at the same time that the producer is refilling the storage tank and
other pumps are active,which means that you need one thread to query the user for the pump number and gaseline quantity inputs,one thread
for producer refilling the storage tank when the inventory reaches the minimum quantity,one thread for each active pumps.The user inputs thread
can run in the main function,but the producer thread and the consumer threads will each need their own function.

Design:

1.initialize terminate,inventory,pump[] quantities and number
2.initialize mutex lock
3.launch producer thread
4.while the pump number is not -1
4.1 get the pump number
4.2 if the pump number is not -1 and the pump[number] is 0
4.2.1 get the pump amount and store it in the pump[number]
4.2.2 launch consumer thread
5.wait for active consumer threads to complete
6.set the terminate flag
7.wait for the producer thread to complete

Thank q!i juz need some clues / helps to start...confused!!!