Use the following functions to restore the default value, if any, for the corresponding attribute:
resetConcurrencyPolicy()
resetContentionScope()
resetInheritancePolicy()
resetPriority()
resetProcessScopePriority()
resetSchedulingPolicy()
resetStackCommitSize()
resetStackReserveSize()
resetStartPolicy()
resetSystemScopePriority()
resetTimeSliceQuantum()
resetUserStack()
These functions always succeed. If the target attribute is not supported, these functions clear any previous setting, and the appropriate default value is supplied by the underlying API.