scala.sys
The package object scala.sys contains methods for reading
and altering core aspects of the virtual machine as well as the
world outside of it.
Type members
Classlikes
A few additional conveniences for Boolean properties.
A few additional conveniences for Boolean properties.
- Companion:
- object
- Source:
- BooleanProp.scala
A lightweight interface wrapping a property contained in some unspecified map.
A lightweight interface wrapping a property contained in some unspecified map. Generally it'll be the system properties but this is not a requirement.
See scala.sys.SystemProperties for an example usage.
- Companion:
- object
- Source:
- Prop.scala
A minimal Thread wrapper to enhance shutdown hooks.
A minimal Thread wrapper to enhance shutdown hooks. It knows how to unregister itself.
- Companion:
- object
- Source:
- ShutdownHookThread.scala
A bidirectional map wrapping the java System properties.
A bidirectional map wrapping the java System properties. Changes to System properties will be immediately visible in the map, and modifications made to the map will be immediately applied to the System properties. If a security manager is in place which prevents the properties from being read or written, the AccessControlException will be caught and discarded.
- Companion:
- object
- Source:
- SystemProperties.scala
The values in SystemProperties can be used to access and manipulate designated system properties.
The values in SystemProperties can be used to access and manipulate
designated system properties. See scala.sys.Prop for particulars.
- Example:
if (!headless.isSet) headless.enable()- Companion:
- class
- Source:
- SystemProperties.scala
Value members
Concrete methods
Register a shutdown hook to be run when the VM exits.
Register a shutdown hook to be run when the VM exits. The hook is automatically registered: the returned value can be ignored, but is available in case the Thread requires further modification. It can also be unregistered by calling ShutdownHookThread#remove().
Note that shutdown hooks are NOT guaranteed to be run.
- Value parameters:
- body
the body of code to run at shutdown
- Returns:
the Thread which will run the shutdown hook.
- See also:
- Source:
- package.scala
Returns all active thread in the current thread's thread group and subgroups.
Returns all active thread in the current thread's thread group and subgroups.
- Returns:
an IndexedSeq containing the threads.
- Source:
- package.scala
An immutable Map representing the current system environment.
An immutable Map representing the current system environment.
If lookup fails, use System.getenv(_) for case-insensitive lookup
on a certain platform. If that also fails, throw NoSuchElementException.
- Returns:
a Map containing the system environment variables.
- Source:
- package.scala
Throw a new RuntimeException with the supplied message.
Throw a new RuntimeException with the supplied message.
- Returns:
Nothing.
- Source:
- package.scala
Exit the JVM with the default status code.
Exit the JVM with the default status code.
- Returns:
Nothing.
- Source:
- package.scala
Exit the JVM with the given status code.
Exit the JVM with the given status code.
- Returns:
Nothing.
- Source:
- package.scala
A bidirectional, mutable Map representing the current system Properties.
A bidirectional, mutable Map representing the current system Properties.
- Returns:
a SystemProperties.
- See also:
- Source:
- package.scala
A convenience method to get the current Runtime instance.
A convenience method to get the current Runtime instance.
- Returns:
the result of
java.lang.Runtime.getRuntime()- Source:
- package.scala