大约有 23,200 项符合查询结果（耗时：0.0300秒） [XML]
Why does sun.misc.Unsafe exist, and how can it be used in the real world?
...traction levels and numerous of checks. Failing the CAS is a bad in a loop esp. when the hardware decides to mispredict the branch (due to high contention) but having few more compare/branches just hurts. Park/Unpark are exposed through LockSupport not AQS (that latter is more of a lock impl. than ...
Should I use SVN or Git? [closed]
...
@Oli Would be good to update your answer (esp about Windows git client) based on the comments here and your experience. The current answer seems biased now that 2-3 years have passed since it was written.
– amit
May 16 '11 at 3:...
Is there a practical use for weak references? [duplicate]
...e quick&dirty caches via soft references but they are just unreliable, esp. w/o control over the GC and caches shall not be a driving force how to configure the GC.
– bestsss
Jan 16 '12 at 2:48
...
Parsing JSON with Unix tools
...
On the basis that some of the recommendations here (esp in the comments) suggested the use of Python, I was disappointed not to find an example.
So, here's a one liner to get a single value from some JSON data. It assumes that you are piping the data in (from somewhere) and s...
What is the fastest integer division supporting division by zero no matter what the result is?
...ype f, @function
f:
pushl %ebp
xorl %eax, %eax
movl %esp, %ebp
movl 12(%ebp), %edx
testl %edx, %edx
sete %al
addl %edx, %eax
movl 8(%ebp), %edx
movl %eax, %ecx
popl %ebp
movl %edx, %eax
sarl $31, %edx
idivl %ec...
What is the difference between a weak reference and an unowned reference?
...ned above. Check "Resolving Strong Reference Cycles for Closures" section, esp. Quote: " Swift requires you to write self.someProperty or self.someMethod() (rather than just someProperty or someMethod()) whenever you refer to a member of self within a closure. This helps you remember that it’s pos...
Can I use assert on Android devices?
... at a package level, or at a class level which enables assertions at that respective level. The flag is off by default, as a result of which the assertion checks are skipped.
I wrote the following code in my sample Activity:
public class AssertActivity extends Activity {
@Override
protected v...
How do I protect Python code? [closed]
... your secrets and trying to protect against NSA-class reverse engineering. Esp if you have a big python code base and reasons to be paranoid. ;)
– Macke
Jan 8 '16 at 8:18
...
What is the fastest way to compute sin and cos together?
...
.align 4,0x90
.globl _fsincos
_fsincos:
pushl %ebp
movl %esp, %ebp
fldl 12(%ebp)
fsincos
movl 8(%ebp), %eax
fstpl 8(%eax)
fstpl (%eax)
leave
ret $4
.subsections_via_symbols
Tada, it uses the fsincos instruction!
...
Performance of foreach, array_map with lambda and array_map with static function
...eed. It would be interesting to see the opcodes generated by this version, especially comparing with/without opcache since it does a lot of optimizations besides code caching.
– FGM
Jan 14 '17 at 16:04
...