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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...int64_t start;
uint64_t end;
int __d0;
asm volatile ("rdtsc\n\tshl $32, %%rdx\n\tor %%rdx, %0" : "=a" (start) : : "%rdx");
mutex.lock();
mutex.unlock();
asm volatile ("rdtsc\n\tshl $32, %%rdx\n\tor %%rdx, %0" : "=a" (end) : : "%rdx");
asm volatile ("\n1:\n\tdecl %%ecx\n\tjnz 1b" : "=c...
List comprehension rebinds names even after scope of comprehension. Is this right?
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– Steven Rumbalski
Nov 10 '11 at 20:32
38
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Batch file to delete files older than N days
...your Windows XP machine at %WinDir%\system32\. This is possible since the EXE is fully compatible between Windows Server 2003 and Windows XP.
Later versions of Windows and Windows Server have it installed by default.
For Windows 7 and newer (including Windows 10):
The syntax has changed a ...
Installing python module within code
... or distutils ( distribute , pip etc.) feature which allows me to just execute something like pypi.install('requests') and requests will be installed into my virtualenv.
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Purpose of ESI & EDI registers?
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edited Nov 4 '15 at 0:32
Daniel S.
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answered ...
In C/C++ what's the simplest way to reverse the order of bits in a byte?
...code.
– wilhelmtell
Apr 8 '10 at 21:32
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show 10 more comments
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How can I get the browser's scrollbar sizes?
...answered Apr 1 '14 at 6:33
Beep.exeBeep.exe
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what is faster: in_array or isset? [closed]
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David HarknessDavid Harkness
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Could not execute editor
...decided to set the full path to vi (e.g. /usr/bin/vi) rather than just the executable. Now everything works. I have to admit that I don't get it since vi is perfectly executable on its own (my $EDITOR env variable is also set to vi), but it's working and my technical karma hasn't been so great latel...
Best way to change the background color for an NSView
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When building for 64-bit or iOS or building 32-bit like 64-bit, NSRect is just another way of saying CGRect. If not, however, these are independent structs, and even though they might consist of the same members, they can never be “toll-free-bridged” as that is a t...