how to  force a dsolve to timeout since it run a very long time

how to be like python set timeout then stop the function, in here , is dsolver

j = 1
for functionlistelement in functionlist0
tesks.append(asyncio.ensure_future(mappedfunc.get(functionlistelement)()))
if j > 1:
workingthreadpool(functionlistelement)
j = j + 1

loop.run_until_complete(asyncio.wait_for(tesks, 1))
loop.close()

plot3d(x^2+y^2, x = -1 .. 1, y = -1 .. 1);

i searched this 

http://www.maplesoft.com/support/helpJP/Maple/view.aspx?path=NAG/d06abc

and

DelaunayTriangulation(points) in help file

is there any example to show how to use these?

2*t*exp(t) + 2*t

would like to apply op recurively 

and output list

[2,t,exp(t),2,t]

not the same ordering every time of monomials after determinant and map sign positive and op in maple 15

sometimes i need to use Reverse or Rotate List to adjust.

why ordering is different in list of monomials?

is it caused by virus?

objectiveproc := proc(mmm)
...
return Trace(abs(M));
end proc:
with(Optimization):
i := 0:
t := 1:
Minimize(objectiveproc(x)-abs(Trace(abs(MA))));

Error, (in objectiveproc) invalid subscript selector