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What is a semaphore?
...is, a mutex can be used to syncronize access to a counter, file, database, etc.
A sempahore can do the same thing but supports a fixed number of simultaneous callers. For example, I can wrap my database calls in a semaphore(3) so that my multithreaded app will hit the database with at most 3 simult...
What's the difference between hard and soft floating point numbers?
...s in integer registers. You can still compile your code with a -mfpu=vfp, etc but you should use -mfloat-abi=softfp so that if the libc needs a float it is passed in a way the library understands.
The Linux kernel can support emulation of the VFP instructions. Obviously, you are better off to com...
@RequestBody and @ResponseBody annotations in Spring
...rated. Both things will be mapped easily without writing any custom parser etc.
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How to debug Ruby scripts [closed]
... pry 0.12.2 however, there are no navigation commands such as next, break, etc. Some other gems additionally provide this, see for example pry-byedebug.
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TCP vs UDP on video stream
...er used in satellite video broadcast that carry several audio, video, EPG, etc. streams. This is necessary as satellite link is not duplex communication, meaning receiver can't request re-transmission of lost packets.
When you have duplex communication available it is always better to re-transmit ...
How can I use Spring Security without sessions?
...ntainer will append ";jsessionid=..." to requests for images, stylesheets, etc, because Tomcat doesn't like to be stateless, and Spring Security will then block these assets on the first load because "the URL contained a potentially malicious String ';'".
– workerjoe
...
When do I need to use AtomicBoolean in Java?
...pent in
managing the synchronization
mechanism itself (waiting, notifying,
etc). Since the new API uses hardware
level constructs (atomic variables)
and wait and lock free algorithms to
implement thread-safety, a lot more
of CPU time is spent "doing stuff"
rather than in managing
synchronization.
no...
Understanding $.proxy() in jQuery
...ary because this is about Context in ECMAScript, the this context variable etc.)
There are three different types of "Contexts" in ECMA-/Javascript:
The global context
Function context
eval context
Every code is executed in its execution context. There is one global context and there can be many...
How to display unique records from a has_many through relationship?
..., :select => "DISTINCT products.*). In the first case, ALL records are fetched and rails removes the duplicates for you. In the later case, only non-duplicate records are fetched from the db so it might offer better performance if you have a large result set.
– mbreining
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background function in Python
... contexts when there are other "greenlets" running. Worries about locking, etc are much reduced, as there is only one thing running at a time, yet the image will continue to download whenever a blocking operation executes in the "main" context.
Depending on how much, and what kind of thing you want...