diff -r 5526520f323f -r 7920ca086e5c doc/images/interrupt.eps
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/images/interrupt.eps	Mon Sep 25 15:53:33 2006 +0000
@@ -0,0 +1,635 @@
+%!PS-Adobe-2.0 EPSF-2.0
+%%Title: interrupt.fig
+%%Creator: fig2dev Version 3.2 Patchlevel 4
+%%CreationDate: Mon Aug  7 13:51:08 2006
+%%For: fp@jupiter (Florian Pose)
+%%BoundingBox: 0 0 538 278
+%%Magnification: 1.0000
+%%EndComments
+/MyAppDict 100 dict dup begin def
+/$F2psDict 200 dict def
+$F2psDict begin
+$F2psDict /mtrx matrix put
+/col-1 {0 setgray} bind def
+/col0 {0.000 0.000 0.000 srgb} bind def
+/col1 {0.000 0.000 1.000 srgb} bind def
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+/col8 {0.000 0.000 0.560 srgb} bind def
+/col9 {0.000 0.000 0.690 srgb} bind def
+/col10 {0.000 0.000 0.820 srgb} bind def
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+/col30 {1.000 0.880 0.880 srgb} bind def
+/col31 {1.000 0.840 0.000 srgb} bind def
+
+end
+save
+newpath 0 278 moveto 0 0 lineto 538 0 lineto 538 278 lineto closepath clip newpath
+-12.2 386.3 translate
+1 -1 scale
+
+% This junk string is used by the show operators
+/PATsstr 1 string def
+/PATawidthshow { 	% cx cy cchar rx ry string
+  % Loop over each character in the string
+  {  % cx cy cchar rx ry char
+    % Show the character
+    dup				% cx cy cchar rx ry char char
+    PATsstr dup 0 4 -1 roll put	% cx cy cchar rx ry char (char)
+    false charpath		% cx cy cchar rx ry char
+    /clip load PATdraw
+    % Move past the character (charpath modified the
+    % current point)
+    currentpoint			% cx cy cchar rx ry char x y
+    newpath
+    moveto			% cx cy cchar rx ry char
+    % Reposition by cx,cy if the character in the string is cchar
+    3 index eq {			% cx cy cchar rx ry
+      4 index 4 index rmoveto
+    } if
+    % Reposition all characters by rx ry
+    2 copy rmoveto		% cx cy cchar rx ry
+  } forall
+  pop pop pop pop pop		% -
+  currentpoint
+  newpath
+  moveto
+} bind def
+/PATcg {
+  7 dict dup begin
+    /lw currentlinewidth def
+    /lc currentlinecap def
+    /lj currentlinejoin def
+    /ml currentmiterlimit def
+    /ds [ currentdash ] def
+    /cc [ currentrgbcolor ] def
+    /cm matrix currentmatrix def
+  end
+} bind def
+% PATdraw - calculates the boundaries of the object and
+% fills it with the current pattern
+/PATdraw {			% proc
+  save exch
+    PATpcalc			% proc nw nh px py
+    5 -1 roll exec		% nw nh px py
+    newpath
+    PATfill			% -
+  restore
+} bind def
+% PATfill - performs the tiling for the shape
+/PATfill { % nw nh px py PATfill -
+  PATDict /CurrentPattern get dup begin
+    setfont
+    % Set the coordinate system to Pattern Space
+    PatternGState PATsg
+    % Set the color for uncolored pattezns
+    PaintType 2 eq { PATDict /PColor get PATsc } if
+    % Create the string for showing
+    3 index string		% nw nh px py str
+    % Loop for each of the pattern sources
+    0 1 Multi 1 sub {		% nw nh px py str source
+	% Move to the starting location
+	3 index 3 index		% nw nh px py str source px py
+	moveto			% nw nh px py str source
+	% For multiple sources, set the appropriate color
+	Multi 1 ne { dup PC exch get PATsc } if
+	% Set the appropriate string for the source
+	0 1 7 index 1 sub { 2 index exch 2 index put } for pop
+	% Loop over the number of vertical cells
+	3 index 		% nw nh px py str nh
+	{			% nw nh px py str
+	  currentpoint		% nw nh px py str cx cy
+	  2 index oldshow	% nw nh px py str cx cy
+	  YStep add moveto	% nw nh px py str
+	} repeat		% nw nh px py str
+    } for
+    5 { pop } repeat
+  end
+} bind def
+
+% PATkshow - kshow with the current pattezn
+/PATkshow {			% proc string
+  exch bind			% string proc
+  1 index 0 get			% string proc char
+  % Loop over all but the last character in the string
+  0 1 4 index length 2 sub {
+				% string proc char idx
+    % Find the n+1th character in the string
+    3 index exch 1 add get	% string proc char char+1
+    exch 2 copy			% strinq proc char+1 char char+1 char
+    % Now show the nth character
+    PATsstr dup 0 4 -1 roll put	% string proc chr+1 chr chr+1 (chr)
+    false charpath		% string proc char+1 char char+1
+    /clip load PATdraw
+    % Move past the character (charpath modified the current point)
+    currentpoint newpath moveto
+    % Execute the user proc (should consume char and char+1)
+    mark 3 1 roll		% string proc char+1 mark char char+1
+    4 index exec		% string proc char+1 mark...
+    cleartomark			% string proc char+1
+  } for
+  % Now display the last character
+  PATsstr dup 0 4 -1 roll put	% string proc (char+1)
+  false charpath		% string proc
+  /clip load PATdraw
+  neewath
+  pop pop			% -
+} bind def
+% PATmp - the makepattern equivalent
+/PATmp {			% patdict patmtx PATmp patinstance
+  exch dup length 7 add		% We will add 6 new entries plus 1 FID
+  dict copy			% Create a new dictionary
+  begin
+    % Matrix to install when painting the pattern
+    TilingType PATtcalc
+    /PatternGState PATcg def
+    PatternGState /cm 3 -1 roll put
+    % Check for multi pattern sources (Level 1 fast color patterns)
+    currentdict /Multi known not { /Multi 1 def } if
+    % Font dictionary definitions
+    /FontType 3 def
+    % Create a dummy encoding vector
+    /Encoding 256 array def
+    3 string 0 1 255 {
+      Encoding exch dup 3 index cvs cvn put } for pop
+    /FontMatrix matrix def
+    /FontBBox BBox def
+    /BuildChar {
+	mark 3 1 roll		% mark dict char
+	exch begin
+	Multi 1 ne {PaintData exch get}{pop} ifelse  % mark [paintdata]
+	  PaintType 2 eq Multi 1 ne or
+	  { XStep 0 FontBBox aload pop setcachedevice }
+	  { XStep 0 setcharwidth } ifelse
+	  currentdict		% mark [paintdata] dict
+	  /PaintProc load	% mark [paintdata] dict paintproc
+	end
+	gsave
+	  false PATredef exec true PATredef
+	grestore
+	cleartomark		% -
+    } bind def
+    currentdict
+  end				% newdict
+  /foo exch			% /foo newlict
+  definefont			% newfont
+} bind def
+% PATpcalc - calculates the starting point and width/height
+% of the tile fill for the shape
+/PATpcalc {	% - PATpcalc nw nh px py
+  PATDict /CurrentPattern get begin
+    gsave
+	% Set up the coordinate system to Pattern Space
+	% and lock down pattern
+	PatternGState /cm get setmatrix
+	BBox aload pop pop pop translate
+	% Determine the bounding box of the shape
+	pathbbox			% llx lly urx ury
+    grestore
+    % Determine (nw, nh) the # of cells to paint width and height
+    PatHeight div ceiling		% llx lly urx qh
+    4 1 roll				% qh llx lly urx
+    PatWidth div ceiling		% qh llx lly qw
+    4 1 roll				% qw qh llx lly
+    PatHeight div floor			% qw qh llx ph
+    4 1 roll				% ph qw qh llx
+    PatWidth div floor			% ph qw qh pw
+    4 1 roll				% pw ph qw qh
+    2 index sub cvi abs			% pw ph qs qh-ph
+    exch 3 index sub cvi abs exch	% pw ph nw=qw-pw nh=qh-ph
+    % Determine the starting point of the pattern fill
+    %(px, py)
+    4 2 roll				% nw nh pw ph
+    PatHeight mul			% nw nh pw py
+    exch				% nw nh py pw
+    PatWidth mul exch			% nw nh px py
+  end
+} bind def
+
+% Save the original routines so that we can use them later on
+/oldfill	/fill load def
+/oldeofill	/eofill load def
+/oldstroke	/stroke load def
+/oldshow	/show load def
+/oldashow	/ashow load def
+/oldwidthshow	/widthshow load def
+/oldawidthshow	/awidthshow load def
+/oldkshow	/kshow load def
+
+% These defs are necessary so that subsequent procs don't bind in
+% the originals
+/fill	   { oldfill } bind def
+/eofill	   { oldeofill } bind def
+/stroke	   { oldstroke } bind def
+/show	   { oldshow } bind def
+/ashow	   { oldashow } bind def
+/widthshow { oldwidthshow } bind def
+/awidthshow { oldawidthshow } bind def
+/kshow 	   { oldkshow } bind def
+/PATredef {
+  MyAppDict begin
+    {
+    /fill { /clip load PATdraw newpath } bind def
+    /eofill { /eoclip load PATdraw newpath } bind def
+    /stroke { PATstroke } bind def
+    /show { 0 0 null 0 0 6 -1 roll PATawidthshow } bind def
+    /ashow { 0 0 null 6 3 roll PATawidthshow }
+    bind def
+    /widthshow { 0 0 3 -1 roll PATawidthshow }
+    bind def
+    /awidthshow { PATawidthshow } bind def
+    /kshow { PATkshow } bind def
+  } {
+    /fill   { oldfill } bind def
+    /eofill { oldeofill } bind def
+    /stroke { oldstroke } bind def
+    /show   { oldshow } bind def
+    /ashow  { oldashow } bind def
+    /widthshow { oldwidthshow } bind def
+    /awidthshow { oldawidthshow } bind def
+    /kshow  { oldkshow } bind def
+    } ifelse
+  end
+} bind def
+false PATredef
+% Conditionally define setcmykcolor if not available
+/setcmykcolor where { pop } {
+  /setcmykcolor {
+    1 sub 4 1 roll
+    3 {
+	3 index add neg dup 0 lt { pop 0 } if 3 1 roll
+    } repeat
+    setrgbcolor - pop
+  } bind def
+} ifelse
+/PATsc {		% colorarray
+  aload length		% c1 ... cn length
+    dup 1 eq { pop setgray } { 3 eq { setrgbcolor } { setcmykcolor
+  } ifelse } ifelse
+} bind def
+/PATsg {		% dict
+  begin
+    lw setlinewidth
+    lc setlinecap
+    lj setlinejoin
+    ml setmiterlimit
+    ds aload pop setdash
+    cc aload pop setrgbcolor
+    cm setmatrix
+  end
+} bind def
+
+/PATDict 3 dict def
+/PATsp {
+  true PATredef
+  PATDict begin
+    /CurrentPattern exch def
+    % If it's an uncolored pattern, save the color
+    CurrentPattern /PaintType get 2 eq {
+      /PColor exch def
+    } if
+    /CColor [ currentrgbcolor ] def
+  end
+} bind def
+% PATstroke - stroke with the current pattern
+/PATstroke {
+  countdictstack
+  save
+  mark
+  {
+    currentpoint strokepath moveto
+    PATpcalc				% proc nw nh px py
+    clip newpath PATfill
+    } stopped {
+	(*** PATstroke Warning: Path is too complex, stroking
+	  with gray) =
+    cleartomark
+    restore
+    countdictstack exch sub dup 0 gt
+	{ { end } repeat } { pop } ifelse
+    gsave 0.5 setgray oldstroke grestore
+  } { pop restore pop } ifelse
+  newpath
+} bind def
+/PATtcalc {		% modmtx tilingtype PATtcalc tilematrix
+  % Note: tiling types 2 and 3 are not supported
+  gsave
+    exch concat					% tilingtype
+    matrix currentmatrix exch			% cmtx tilingtype
+    % Tiling type 1 and 3: constant spacing
+    2 ne {
+	% Distort the pattern so that it occupies
+	% an integral number of device pixels
+	dup 4 get exch dup 5 get exch		% tx ty cmtx
+	XStep 0 dtransform
+	round exch round exch			% tx ty cmtx dx.x dx.y
+	XStep div exch XStep div exch		% tx ty cmtx a b
+	0 YStep dtransform
+	round exch round exch			% tx ty cmtx a b dy.x dy.y
+	YStep div exch YStep div exch		% tx ty cmtx a b c d
+	7 -3 roll astore			% { a b c d tx ty }
+    } if
+  grestore
+} bind def
+/PATusp {
+  false PATredef
+  PATDict begin
+    CColor PATsc
+  end
+} bind def
+
+% right45
+11 dict begin
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+/PatternType 1 def
+/TilingType 1 def
+/BBox [0 0 1 1] def
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+  { 20 20 true [ 20 0 0 -20 0 20 ]
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+	0020080040100080200000401000802001004002
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+     imagemask } bind
+] def
+/PaintProc {
+	pop
+	exec fill
+} def
+currentdict
+end
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+$F2psBegin
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+$F2psEnd
+rs
+end
+showpage