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What exactly is a reentrant function?
...bar);
return 0;
}
If the lock on mutex is not recursive, then here's what will happen, in the main thread:
main will call foo.
foo will acquire the lock.
foo will call bar, which will call foo.
the 2nd foo will try to acquire the lock, fail and wait for it to be released.
Deadlock.
Oops…
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proper hibernate annotation for byte[]
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What is the portable way to annotate a byte[] property?
It depends on what you want. JPA can persist a non annotated byte[]. From the JPA 2.0 spec:
11.1.6 Basic Annotation
The Basic annotation is the simplest
ty...
changing source on html5 video tag
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Modernizr worked like a charm for me.
What I did is that I didn't use <source>. Somehow this screwed things up, since the video only worked the first time load() was called. Instead I used the source attribute inside the video tag -> <video src="blabl...
How to for each the hashmap? [duplicate]
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I know I'm a bit late for that one, but I'll share what I did too, in case it helps someone else :
HashMap<String, HashMap> selects = new HashMap<String, HashMap>();
for(Map.Entry<String, HashMap> entry : selects.entrySet()) {
String key = entry.getKey...
Is there a REAL performance difference between INT and VARCHAR primary keys?
...ake a good point that you can avoid some number of joined queries by using what's called a natural key instead of a surrogate key. Only you can assess if the benefit of this is significant in your application.
That is, you can measure the queries in your application that are the most important t...
Is VB really case insensitive?
I'm not trying to start an argument here, but for whatever reason, it's typically stated that Visual Basic is case insensitive and C languages aren't (and somehow that is a good thing).
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Is the Javascript date object always one day off?
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Creating it as just UTC from a string would be what I'd like to do, hence why I asked "How do you "specify the correct timezone"?" regarding where you stated "you just never specified the correct time zone.". If I do new Date('2012-01-01 GMT') it still applies an offset ...
How to assign the output of a command to a Makefile variable
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Use the Make shell builtin like in MY_VAR=$(shell echo whatever)
me@Zack:~$make
MY_VAR IS whatever
me@Zack:~$ cat Makefile
MY_VAR := $(shell echo whatever)
all:
@echo MY_VAR IS $(MY_VAR)
share...
When would you use a List instead of a Dictionary?
What is the difference between a List of KeyValuePair and a Dictionary for the same types? Is there an appropriate time to use one or the other?
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Create a custom event in Java
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What if multiple threads are generating the source events, will this be synchronized properly ?
– Mike G
Nov 5 '12 at 5:18
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