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地图组件（高德地图） · App Inventor 2 中文网
... FillColor。
标记 还可以通过调用 地图 的 CreateMarker 方法动态创建，并使用 “Any Component” 块进行配置。
属性
锚点水平对齐
设置或获取 标记 中心相对于其图像的水平偏移量。有效值为：1（左）、2（右）...
AtomicInteger lazySet vs. set
...rve as a soft barrier costing 20 cycles on nehelem intel cpu)
on x86 (x86_64) such a barrier is much cheaper performance-wise than volatile or AtomicLong getAndAdd ,
In an one producer, one consumer queue scenario, xchg soft barrier can force the line of codes before the lazySet(sequence+1) for p...
The difference between fork(), vfork(), exec() and clone()
...
vfork is still useful in cygwin (a kernel emulating dll, that runs on top of Microsoft's Windows). cygwin can not implement an efficient fork, as the underlying OS does not have one.
– ctrl-alt-delor
May 6 '17 at 11:39
...
What is a bus error?
...nd of the allocated object.
Unaligned stack memory accesses in ARMv8 aarch64
This was mentioned at: What is a bus error? for SPARC, but here I will provide a more reproducible example.
All you need is a freestanding aarch64 program:
.global _start
_start:
asm_main_after_prologue:
/* misalign...
How many threads can a Java VM support?
...mb --> 5687 threads
32 mb --> 5662 threads
48 mb --> 5610 threads
64 mb --> 5561 threads
96 mb --> 5457 threads
128 mb --> 5357 threads
192 mb --> 5190 threads
256 mb --> 5014 threads
384 mb --> 4606 threads
512 mb --> 4202 threads
768 mb --> 3388 threads
1024 mb --&...
convert double to int
...ze of an int is always 32 bits, regardless of whether you're using a 32 or 64 bit machine.
– Joren
Nov 15 '10 at 10:15
3
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Programmatically retrieve memory usage on iPhone
...mach_task_basic_info. My guess is that this version is not compatible with 64-bit architecture, but not really sure.
– cprcrack
Oct 30 '13 at 18:16
14
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Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED
...
piggybackpiggyback
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How to find where gem files are installed
...MS VERSION: 2.1.5
- RUBY VERSION: 2.0.0 (2013-06-27 patchlevel 247) [x86_64-darwin12.4.0]
- INSTALLATION DIRECTORY: /Users/ttm/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0
- RUBY EXECUTABLE: /Users/ttm/.rbenv/versions/2.0.0-p247/bin/ruby
- EXECUTABLE DIRECTORY: /Users/ttm/.rbenv/versions/2...
Performance surprise with “as” and nullable types
...d. Hard to estimate the cost since this code is locked up inside mscorwks.dll, but hundreds of machine code instructions is likely.
The Linq OfType() extension method also uses the is operator and the cast. This is however a cast to a generic type. The JIT compiler generates a call to a helper f...