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深入理解 x86/x64 的中断体系 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
... ax
mov sp, BOOT_SEG
mov si, msg1
call printmsg
sidt [old_IVT] ; save old IVT
mov cx, [old_IVT]
mov [new_IVT], cx ; limit of new IVT
mov dword [new_IVT+2], 0x8000 ; base of n...
Fastest hash for non-cryptographic uses?
...s is:
$loops = 100000;
$str = "ana are mere";
echo "<pre>";
$tss = microtime(true);
for($i=0; $i<$loops; $i++){
$x = crc32($str);
}
$tse = microtime(true);
echo "\ncrc32: \t" . round($tse-$tss, 5) . " \t" . $x;
$tss = microtime(true);
for($i=0; $i<$loops; $i++){
$x = m...
How does a debugger work?
...r will look up the process ID, and initiate the debug session via a system call; under Windows this would be DebugActiveProcess.
Once attached, the debugger will enter an event loop much like for any UI, but instead of events coming from the windowing system, the OS will generate events based on wh...
What is the difference between user and kernel modes in operating systems?
...her’s memory. If
it needs to access any of these features – it makes a call to the
underlying API. Each process started by windows except of system
process runs in user mode.
Kernel mode:
mode where all kernel programs execute (different drivers). It has
access to every resource and underly...
Performing Breadth First Search recursively
...ture of a queue and a stack are pretty much opposite, so trying to use the call stack (which is a stack, hence the name) as the auxiliary storage (a queue) is pretty much doomed to failure, unless you're doing something stupidly ridiculous with the call stack that you shouldn't be.
On the same toke...
How to reuse existing C# class definitions in TypeScript projects
...
TypeLite and T4TSs above both looked good, just picked one, TypeLite, forked it to get support for
ValueTypes,
Nullables
camelCasing (TypeScript root doc uses camels, and this goes too nice together with C#)
public fields (love clean and...
What exactly is Spring Framework for? [closed]
...
Basically Spring is a framework for dependency-injection which is a pattern that allows building very decoupled systems.
The problem
For example, suppose you need to list the users of the system and thus declare an interface ca...
Random number generator only generating one random number
...n, max);
}
}
Edit (see comments): why do we need a lock here?
Basically, Next is going to change the internal state of the Random instance. If we do that at the same time from multiple threads, you could argue "we've just made the outcome even more random", but what we are actually doing is...
Benefits of inline functions in C++?
...
while the call itself indeed matters, that's only the minor gain you get by using inline. The major gain is, that the compiler now see where pointers don't alias each other, where variables of the caller end up in the callee and so on....
Alternative to google finance api [closed]
... on
Google Code.
For beginners, you can generate a CSV with a simple API call:
http://finance.yahoo.com/d/quotes.csv?s=AAPL+GOOG+MSFT&f=sb2b3jk
(This will generate and save a CSV for AAPL, GOOG, and MSFT)
Note that you must append the format to the query string (f=..). For an overview of a...