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Java: notify() vs. notifyAll() all over again
...llowing sequence of events occurs - deadlock results:
STEP 1:
- P1 puts 1 char into the buffer
STEP 2:
- P2 attempts put - checks wait loop - already a char - waits
STEP 3:
- P3 attempts put - checks wait loop - already a char - waits
STEP 4:
- C1 attempts to get 1 char
- C2 attempts to get 1 c...
do { … } while (0) — what is it good for? [duplicate]
...t;}) instead of do {} while(0):
#include <stdio.h>
#define log_to_string1(str, fmt, arg...) \
do { \
sprintf(str, "%s: " fmt, "myprog", ##arg); \
} while (0)
#define log_to_string2(str, fmt, arg...) \
({ \
sprintf(str, "%s: " fmt, "myprog", ##arg); \
})
int...
Bash continuation lines
...is creates two arguments to echo and you only want one, then let's look at string concatenation. In bash, placing two strings next to each other concatenate:
$ echo "continuation""lines"
continuationlines
So a continuation line without an indent is one way to break up a string:
$ echo "continua...
Getting only response header from HTTP POST using curl
...
The Following command displays extra informations
curl -X POST http://httpbin.org/post -v > /dev/null
You can ask server to send just HEAD, instead of full response
curl -X HEAD -I http://httpbin.org/
Note: In some cases, server may send different...
How big can a user agent string get?
... the UserAgent auto-increment primary key field
Store the actual UserAgent string in a TEXT field and care not about the length
Have another UNIQUE BINARY(32) (or 64, or 128 depending on your hash length) and hash the UserAgent
Some UA strings can get obscenely long. This should spare you the worr...
What would be the Unicode character for big bullet in the middle of the character?
... font). Searching for “circle” finds many characters, too many, as the string appears in so many names. The largest simple circle is probably U+25CF BLACK CIRCLE “●”. If it’s too large U+26AB MEDIUM BLACK CIRCLE “⚫” might be suitable.
Beware that few fonts contain these characters...
Where/How to getIntent().getExtras() in an Android Fragment? [duplicate]
...
you can still use
String Item = getIntent().getExtras().getString("name");
in the fragment, you just need call getActivity() first:
String Item = getActivity().getIntent().getExtras().getString("name");
This saves you having to write som...
Can I concatenate multiple MySQL rows into one field?
...
If you want to sort hobbies in the resulting imploded string use: SELECT person_id, GROUP_CONCAT(hobbies ORDER BY hobbies ASC SEPARATOR ', ') FROM peoples_hobbies GROUP BY person_id
– Jan
Mar 8 '17 at 15:38
...
Why do some claim that Java's implementation of generics is bad?
...etrized instance. For example, if I have a class with a method foo(List<String>), I can reflectively find "String"
– oxbow_lakes
Feb 6 '09 at 16:35
...
What breaking changes are introduced in C++11?
..."abcdef", now "def"
#define _x "there"
"hello"_x // now a user-defined-string-literal. Previously, expanded _x .
New keywords: alignas, alignof, char16_t, char32_t, constexpr, decltype, noexcept, nullptr, static_assert, and thread_local
Certain integer literals larger than can be r...