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Difference between binary semaphore and mutex
... to semGive a mutex currently held by Task A, Task B's call will return an error and fail.
Mutexes always use the following sequence:
- SemTake
- Critical Section
- SemGive
Here is a simple example:
Thread A Thread B
Take Mutex
access data
... ...
std::string formatting like sprintf
... ) + 1; // Extra space for '\0'
if( size <= 0 ){ throw std::runtime_error( "Error during formatting." ); }
std::unique_ptr<char[]> buf( new char[ size ] );
snprintf( buf.get(), size, format.c_str(), args ... );
return std::string( buf.get(), buf.get() + size - 1 ); // We do...
Make sure only a single instance of a program is running
...cntl.LOCK_EX | fcntl.LOCK_NB)
already_running = False
except IOError:
already_running = True
return already_running
A lot like S.Lott's suggestion, but with the code.
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NHibernate.MappingException: No persister for: XYZ
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This was my problem also, get the same error as in Q when doing get. When trying to query all of the objects of that type, no error, just an empty result set!
– Christoph
May 18 '15 at 15:34
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Phase • Animations made easy! - Extensions - Kodular Community
...eSvVWMKMOxG1Hi82M4qOCNQ/view?usp=sharing
Let me know if you find any bugs/errors. Also, I’m open to suggestions and feature requests.
127 Likes
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How can I configure Logback to log different levels for a logger to different destinations?
...ngs with Logback filters. The below configuration will only print warn and error messages to stderr, and everything else to stdout.
logback.xml
<appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
<target>System.out</target>
<filter class="com.foo.StdOutFil...
Resolving MSB3247 - Found conflicts between different versions of the same dependent assembly
... people to actually use the Output window. Build is so much more than F5 + Error List window.
– JJS
Apr 1 '10 at 21:01
2
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Git error: “Host Key Verification Failed” when connecting to remote repository
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As I answered previously in Cloning git repo causes error - Host key verification failed. fatal: The remote end hung up unexpectedly, add the GitHub to the list of authorized hosts:
ssh-keyscan -t rsa github.com >> ~/.ssh/known_hosts
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Array.push() if does not exist?
...verywhere.
– dt192
May 30 '19 at 14:05
Thank you, saves my time.
– Mehadi Hassan
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How do you test that a Python function throws an exception?
...he assertion; using @Moe's answer above for example: self.assertRaises(TypeError, mymod.myfunc). You can find a full list of the Built-in Exceptions here: docs.python.org/3/library/exceptions.html#bltin-exceptions
– Raymond Wachaga
Feb 7 '19 at 17:51
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