Java
Double-checked locking
Warning
New
Last modified: 03 December 2024Reports double-checked locking.
Double-checked locking tries to initialize a field on demand and in a thread-safe manner, while avoiding the cost of synchronization. Unfortunately it is not thread-safe when used on a field that is not declared volatile
. When using Java 1.4 or earlier, double-checked locking doesn't work even with a volatile
field. Read the article linked above for a detailed explanation of the problem.
Example of incorrect double-checked locking:
class Foo {
private Helper helper = null;
public Helper getHelper() {
if (helper == null)
synchronized(this) {
if (helper == null) helper = new Helper();
}
return helper;
}
}
// other functions and members...
}
- By ID
Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.
DoubleCheckedLocking
Inspection Details | |
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By default bundled with: | |
Can be installed with plugin: | Java, 243.23126 |
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