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function [flavorNameString, priorityStruct] = MachGetPriorityFlavor
% OS X: ___________________________________________________________________
%
% MachGetPriorityFlavor returns the priority flavor mode of the main
% MATLAB thread, either 'THREAD_TIME_CONSTRAINT_POLICY' or
% 'THREAD_STANDARD_POLICY'.
%
% The second return argument, priorityStruct, is the priority struct for
% the active priority flavor mode.
%
% The priority flavor 'THREAD_PRECEDENCE_POLICY' is never returned
% because its status is implied by either 'THREAD_TIME_CONSTRAINT_POLICY'
% or 'THREAD_STANDARD_POLICY':
%
% -If flavorNameString is 'THREAD_TIME_CONSTRAINT_POLICY', then then
% 'THREAD_PRECEDENCE_POLICY'and its 'importance' parameter are ignored
% by the Mach task scheduler.
%
% -If flavorNameString is 'THREAD_STANDARD_POLICY' then the 'importance'
% parameter associated with 'THREAD_PRECEDENCE_POLICY' governs the
% relative allocation of CPU time between the main MATLAB thread and all
% other threads of the MATLAB process.
%
% MachGetPriorityFlavor probes priority using MachGetPriorityMex.
%
% OS 9: ___________________________________________________________________
%
% MachGetPriorityFlavor does not exist in OS 9.
%
% WINDOWS: ________________________________________________________________
%
% MachGetPriorityFlavor does not exist in Windows.
%
% _________________________________________________________________________
%
% see also: Priority, Rush, MachGetPriorityMex, MachSetPriorityMex,
% AUTHORS:
% Allen Ingling awi Allen.Ingling@nyu.edu
%
% HISTORY:
% 8/13/03 awi Wrote it.
% 7/16/03 awi Improved documentation. Added AssertOSX.
%Give a sensible error message and exit if this is not OSX
AssertOSX;
% Find the mode by requesting the current priority parameters of a
% particular policy flavor. If MachGetPriorityMex returns not
% the current priority paramters as requested but instead the default priority parameters
% (as indicated by the isDefault flag in the returned struct) then
% the thread is not in the specified policy flavor mode.
%
psTCP = MachGetPriorityMex('THREAD_TIME_CONSTRAINT_POLICY', 0); % 0 flag means get the current mode, 1 flag means get the default mode.
psS = MachGetPriorityMex('THREAD_STANDARD_POLICY', 0);
if ~psTCP.isDefault && psS.isDefault
flavorNameString='THREAD_TIME_CONSTRAINT_POLICY';
priorityStruct=psTCP;
return
elseif psTCP.isDefault && ~psS.isDefault
flavorNameString='THREAD_STANDARD_POLICY';
priorityStruct=psS;
return
elseif psTCP.isDefault && psS.isDefault
error('MachGetPriorityMex reports both THREAD_STANDARD_POLICY and THREAD_TIME_CONSTRAINT_POLICY modes. Internal error ?');
elseif ~psTCP.isDefault && ~psS.isDefault
error('MachGetPriorityMex reports neither THREAD_STANDARD_POLICY nor THREAD_TIME_CONSTRAINT_POLICY mode. Internal error ?');
end
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