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Difference between dispatch_async and dispatch_sync on serial queue?
...atch_async(_serialQueue, ^{ printf("3"); });
printf("4");
It may print 2413 or 2143 or 1234 but 1 always before 3
for this code
dispatch_sync(_serialQueue, ^{ printf("1"); });
printf("2");
dispatch_sync(_serialQueue, ^{ printf("3"); });
printf("4");
it always print 1234
Note: For first code...
Add unique constraint to combination of two columns
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edited Apr 4 '13 at 0:38
answered Apr 3 '13 at 23:56
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Why do function pointer definitions work with any number of ampersands '&' or asterisks '*'?
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answered Mar 21 at 13:17
Lewis KelseyLewis Kelsey
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Global and local variables in R
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<- does assignment in the current environment.
When you're inside a function R creates a n...
How do I run IDEA IntelliJ on Mac OS X with JDK 7?
...orks fine. Thoughts?
– 9ee1
Jan 10 '13 at 4:56
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The retina issue was fixed in Java 7u40: stackov...
What is the boundary in multipart/form-data?
... Borodin
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answered Dec 2 '13 at 5:07
Oscar MederosOscar Mederos
25....
C# Thread safe fast(est) counter
...in Salonen
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What is the difference between CascadeType.REMOVE and orphanRemoval in JPA?
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answered Sep 15 '13 at 14:18
Rahul TripathiRahul Tripathi
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how to use “AND”, “OR” for RewriteCond on Apache?
...or C ) and D )
– Pete
Oct 26 '17 at 13:48
@WillshawMedia You can do ((A and B) OR (C and D)) by splitting it into two ...
Xcode 4.5 Storyboard 'Exit'
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edited Sep 21 '13 at 18:35
answered Sep 17 '12 at 14:37
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