Filter
Top Products
Services — Boot Services
Version 1.10 12/01/02 5-17
RestoreTPL()
Summary
Restores a task’s priority level to its previous value.
Prototype
VOID
RestoreTPL (
IN EFI_TPL OldTpl
)
Parameters
OldTpl The previous task priority level to restore (the value from a
previous, matching call to RaiseTPL()). Type EFI_TPL is
defined in the RaiseTPL()
function description.
Description
The RestoreTPL() function restores a task’s priority level to its previous value. Calls to
RestoreTPL() are matched with calls to RaiseTPL().
NOTE
If OldTpl is above the current TPL level, then the system behavior is indeterminate.
Additionally, only TPL_APPLICATION, TPL_CALLBACK, TPL_NOTIFY, and
TPL_HIGH_LEVEL
may be used. All other values are reserved for use by the firmware; using
them will result in unpredictable behavior. Good coding practice dictates that all code should
execute at its lowest possible TPL level, and the use of TPL levels above TPL_APPLICATION
must be minimized. Executing at TPL levels above TPL_APPLICATION for extended periods of
time may also result in unpredictable behavior.
Status Codes Returned
None.