Querying Attribute Values

Threads Module User's Guide : PART II Concurrency Packages : Chapter 3 The Threading Package : Thread Attributes : Querying Attribute Values

Use the following functions to query the corresponding attribute value:

• getConcurrencyPolicy()

• getContentionScope()

• getInheritancePolicy()

• getPriority()

• getProcessScopePriority()

• getSchedulingPolicy()

• getStackCommitSize()

• getStackReserveSize()

• getStartPolicy()

• getSystemScopePriority()

• getTimeSliceQuantum()

• getUserStackAddress()

• getUserStackSize()

These functions throw the following exceptions:

• RWTHROperationNotSupported if the attribute is not recognized or supported by the current environment

• RWTHROperationNotAvailable if the specified attribute is supported, but its value has not yet been defined with a call to the matching “set” function, and no default value is available under the current circumstances.

The process-scope and system-scope priority functions can be substituted for getPriority(), and vice-versa, as long as you define the appropriate contention scope.

Once a thread has been created and is active, you can use the following RWThread or RWThreadSelf functions to set the corresponding thread attribute value:

• getPriority()

• getProcessScopePriority()

• getSchedulingPolicy()

• getSystemScopePriority()

• getTimeSliceQuantum()

In addition to the exceptions produced by their RWThreadAttribute counterparts, these functions throw an RWTHRThreadNotActive exception if the threaded runnable instance being manipulated does not have an active thread.