Problem - Kevin Tafuro

On Windows, the idea is the same, and the structure of the code is similar. Here is
the same code as presented above, but implemented using the Win32 API:
#include
static DWORD WINAPI ThreadStub(LPVOID lpData) {
return 0;
}
void SpcTimeThreads(DWORD dwIterCount) {
DWORD dwThreadId;
HANDLE hThread;
while (dwIterCount--) {
if ((hThread = CreateThread(0, 0, ThreadStub, 0, 0, &dwThreadId)) != 0) {
WaitForSingleObject(hThread, INFINITE);
CloseHandle(hThread);
}
}
}
See Recipe 4.14 for several different ways to get a timestamp. We strongly recommend
that you use the most accurate method available on your platform.
See Also
Recipes 4.14, 11.19
11.23 Gathering Entropy from System State
Problem
You want to get some information that might actually change rapidly about the state
of the kernel, in the hope that you might be able to get a bit of entropy from it.
Solution
The solution is highly operating system–specific. On systems with a /proc filesystem,
you can read the contents of all the files in /proc. Otherwise, you can securely invoke
commands that have some chance of providing entropy (especially if called infrequently).
On Windows, the Performance Data Helper (PDH) API can be used to
query much of the same type of information available on Unix systems with a /proc
filesystem.
Mix any data you collect, as well as a timestamp taken after the operation completes,
into an entropy pool (see Recipe 11.19).
644 | Chapter 11: Random Numbers
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