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5£®ÐźÅÁ¿SµÄÎïÀíÒâÒåÈçÏ£º s£¾0ʱ£¬S±íʾ¿ÉʹÓõÄ×ÊÔ´Êý»ò±íʾ¿ÉʹÓÃ×ÊÔ´µÄ½ø³ÌÊý¡£s£½0ʱ£¬±íʾÎÞ×ÊÔ´¿É¹©Ê¹Óúͱíʾ²»ÔÊÐí½ø³ÌÔÙ½øÈëÁÙ½çÇø¡£s£¼0ʱ£¬©¦S©¦±íʾµÈ´ýʹÓÃ×ÊÔ´µÄ½ø³Ì¸öÊý»ò±íʾµÈ´ý½øÈëÁÙ½çÇøµÄ½ø³Ì¸öÊý¡£
6£®Pv²Ù×÷ÊÇÖ¸ÔÚÐźÅÁ¿ÉϽøÐеÄP²Ù×÷ºÍv²Ù×÷¡£¼Ù¶¨ÐźÅÁ¿Îªs£¬ÔòP(s)ºÍv(s)µÄ¶¨ÒåÈçÏ£º Procedure p(Var s:semaphore);
begin s:=s-1; if s<0 then w(s) end; Procedure v(Var s:semaphore);
begin s:=s+1; if s<=0 then r (s) end;
ÆäÖУ¬W(s)±íʾ½«µ÷ÓÃP(s)¹ý³ÌµÄ½ø³ÌÖóɡ°µÈ´ýÐźÅÁ¿s¡±µÄ״̬£¬ÇÒ½«ÆäÅÅÈëµÈ´ý¶ÓÁС£R(s)±íʾÊÍ·ÅÒ»¸ö¡°µÈ´ýÐźÅÁ¿s¡±µÄ½ø³Ì£¬¸Ã½ø³Ì´ÓµÈ´ý¶ÓÁÐÍ˳ö²¢¼ÓÈë¾ÍÐ÷¶ÓÁÐÖÐ.
7.(1)¶Ôÿһ¸ö¹²Ïí×ÊÔ´(º¬±äÁ¿)¶¼ÒªÉèÁ¢ÐźÅÁ¿£¬»¥³âʱ¶ÔÒ»¸ö¹²Ïí×ÊÔ´ÉèÒ»¸öÐźÅÁ¿£¬Í¬²½Ê±¶ÔÒ»¸ö¹²Ïí×ÊÔ´¿ÉÄÜÒªÉèÁ½¸ö»ò¶à¸öÐźÅÁ¿£¬ÊÓÓɼ¸¸ö½ø³ÌÀ´Ê¹Óøù²Ïí±äÁ¿¶ø¶¨¡£(2)»¥³âʱÐźÅÁ¿µÄ³õÖµ¿É´óÓÚ»òµÈÓÚ1,ͬ²½Ê±£¬ÖÁÉÙÓÐÒ»¸öÐźÅÁ¿µÄ³õÖµ´óÓÚµÈÓÚ1¡£(3)Pv²Ù×÷Ò»¶¨Òª³É¶Ôµ÷Ó㬻¥³âʱÔÚÁÙ½çÇøÇ°ºó¶ÔͬһÐźÅÁ¿×÷Pv²Ù×÷£¬Í¬²½Ê±Ôò¶Ô²»Í¬µÄÐźÅÁ¿×÷Pv²Ù×÷£¬Pv²Ù×÷µÄλÖÃÒ»¶¨ÒªÕýÈ·¡£(4)¶Ô»¥³âºÍͬ²½»ìºÏÎÊÌ⣮PV²Ù×÷¿ÉÄÜ»áǶÌ×£¬¡ª°ãͬ²½µÄPv²Ù×÷ÔÚÍ⣬»¥³âµÄPv²Ù×÷ÔÚÄÚ¡£
8ͨ¹ýרÃŵÄͨÐÅ»úÖÆÊµÏÖ½ø³Ì¼ä½»»»´óÁ¿ÐÅÏ¢µÄͨÐÅ·½Ê½³ÆÎª½ø³ÌͨÐÅ¡£×î»ù±¾µÄͨÐÅÔÓïÓÐsendÔÓïºÍreceiveÔÓǰÕ߸ºÔð·¢ËÍÐżþ£¬ºóÕ߸ºÔð½ÓÊÕÐżþ¡£
9£®Ö±½ÓͨÐÅÊǹ̶¨ÔÚÒ»¶Ô½ø³Ì¼ä½øÐеÄ,¶ø¼ä½ÓͨÐÅʱÒÔÐÅÏäΪýÌåʵÏÖͨÐÅ¡£Òò´ËÔÚsendºÍreceiveÔÓïÖÐ,µÚÒ»¸ö²ÎÊý»¥²»Ïàͬ¡£Ö±½ÓͨÐÅʱ·Ö±ðΪ½ÓÊÕÕß½ø³ÌÃûºÍ·¢ËÍÕß½ø³ÌÃû,¶ø¼ä½ÓͨÇéʱ¾ùΪÐÅÏäÃû¡£ 10£®ÔÚ²ÉÓÃÏ̼߳¼ÊõµÄ²Ù×÷ϵͳÖУ¬Ïß³ÌÓë½ø³ÌµÄ¸ù±¾Çø±ðÔÚÓÚ£º½ø³ÌÊÇ×ÊÔ´µÄ·ÖÅ䵥룬¶øÏß³ÌÊǵ÷¶ÈºÍÖ´Ðе¥Î»¡£ (ËÄ)Ó¦ÓÃÌâ
1 ·ÖÎö£º±¾Ìâ¿É²Î¿¼¶ÁÕßдÕßÎÊÌ⣬Ï൱ÓÚÁ½×é¶ÁÕßʹÓÃÒ»¸ö¹²ÏíÎļþµÄ»¥³âÎÊÌâ¡£¶Ô¹²Ïí×ÊÔ´AB·¶ÎÉèÒ»¸öÐźÅÁ¿s£¬¶ÔA¡¢BÁ½¶ËµÄ¹²Ïí¼ÆÊýÆ÷cAºÍcBÓ¦ÉèÁ½¸öÐźÅÁ¿sAºÍSB¡£ËùÉè¼ÆµÄ³ÌÐò¶ÎÈçÏ£º BEGIN s,sa,ab: semaphore; ca,cb:integer; s:=1; sa:=1; sb:=1; Cobegin
Process car-ai;{I=1,2,¡¡}
Begin p(sa); ca:=ca+1; if ca=1 then p(s); v(sa); {ʹÐźŵÆA¶ËÂÌ£¬B¶Ëºì,³µÁ¾´ÓA¶ËÊ»ÈëAB¶Î}
p(sa); ca:=ca-1; if ca=0 then begin {A,BÁ½¶Ë¶¼ÁÁºìµÆ2·ÖÖÓ} v(s) end; end; Process car-bj;{j=1,2,¡¡}
Begin p(sb); cb:=cb+1; if cb=1 then p(s); v(sb); {ʹÐźŵÆB¶ËÂÌ£¬A¶Ëºì£»³µÁ¾´ÓB¶ËÊ»ÈëAB¶Î}
p(sb); cb:=cb-1; if cb=0 then begin {A,BÁ½¶Ë¶¼ÁÁºìµÆ2·ÖÖÓ} v(s) end; end; coend; end;
2·ÖÎö£º´ËÌâÀàËÆÓÚÁ½¸öÉú²úÕßÏû·ÑÕßÎÊÌâ¡£²ÉÑù¹ý³ÌÏ൱ÓÚÉú²úÕߣ¬×ª»»¹ý³ÌÏ൱ÓÚÏû·ÑÕߣ¬ÏÔʾ¹ý³ÌΪÏû·ÑÕߣ¬¶ø×ª»»¹ý³Ì»¹³äµ±Éú²úÕß¡£Îª´ËÉèÁ¢Èý¸öÐźÅÁ¿£ºSS±íʾ²É¼¯µÄ΢µçѹֵÄÜ·ñ´æÈ뻺³åÇø,³õֵΪ1£»Sc±íʾ»º³åÇøÖÐÊÇ·ñÓÐ΢µçѹֵҪת»»³ÉζÈÖµ£¬,³õֵΪ0£»sD±íʾ»º³åÇøÊÇ·ñÓÐζÈÖµÒªÏÔʾ£¬³õֵΪ0¡£½â¾ö´Ëͬ²½ÎÊÌâµÄ³ÌÐò¶ÎΪ£º
BEGIN ss,sc,sd: semaphore; buffer : integer; ss:=1; sc:=0; sd:=0; Cobegin
Process sample;
Begin L1: get a sample; p(ss); buffer:= sample; v(sc); goto L1 end; Process convert;
Begin L2: p(sc); take a sample from buffer; convert the sample to temperature; buffer:= temperature; v(sd); goto L2 end; Process display;
Begin L3: p(sd); take a temperature from buffer; v(ss); display the temperature; goto L3 end; Coend; end;
3£®·ÖÎö£º±¾ÌâÒ²¿É¿´×÷ÊÇÁ½¸öÉú²úÕßÏû·ÑÕßÎÊÌâ¡£Reader½ø³ÌΪÉú²úÕߣ¬Executor½ø³Ì¼ÈÊÇÏû·ÑÕßÓÖÊÇÉú²úÕߣ¬Printer½ø³ÌΪÏû·ÑÕߣ¬ÓÉÓÚÕâÀïÓÐÁ½¸ö»º³åÇø£¬ËùÒÔÒªÉèËĸöÐźÅÁ¿£ºsR±íʾÊÇ·ñÄܰÑÊý¾Ý´æÈ뻺³åÇøB1£¬³õֵΪ1£»SEl±íʾ»º³åÇøBlÖÐÊÇ·ñÒÑ´æÓÐÊý¾Ý¿É¹©´¦Àí£¬³õֵΪ0£»SE2±íʾÊÇ·ñ°Ñ´¦Àí¹ýµÄÊý¾Ý´æÈ뻺³åÇøB2£¬³õֵΪ1£»sP±íʾ»º³åÇøB2ÖÐÊÇ·ñÒÑ´æÓÐÊý¾Ý¿É¹©´òÓ¡£¬³õֵΪ0¡£ÓÃPv²Ù×÷¹ÜÀíÕâÈý¸ö²¢·¢½ø³ÌµÄ³ÌÐòÈçÏ£º
BEGIN sr,se1,se2,sp: semaphore; b1,b2 : integer; sr:=1; se1:=0; sp:=0; se2:=1; Cobegin Process reader; Var number:integer;
Begin L1: read a number ; p(sr); b1:= number; v(se1); goto L1 end; Process executor; Var number2:integer;
Begin L2: p(se1); take a number from b1; v(sr); process the number to number2; p(se2); b2:= number2; v(sp); goto L2 end; Process printer;
Begin L3: p(sp); take a number from b2; v(se2); print the number; goto L3 end; Coend; end;
4£®ÉèÉú²úÕßÏû·ÑÕß½ø³ÌÒªÉèÁ¢µÄ¹«ÓÃÐÅÏäB£¬¼ÙÉèÏÖÔÚÐÅÏäÖзÅÒ»·â³õʼÐżþ£¬±íʾÎïÆ·ÒÑÈ¡×ß¡£Óýø³ÌͨÐŹÜÀíÉú²úÕßÏû·ÑÕßÎÊÌâµÄ³ÌÐòÈçÏ£º begin ¡.. PROCESS Producer; ¡¡
L1: Produce a product; L2: receive(B,H);
If {xÖÐûÓбíʾÎïÆ·ÒÑÈ¡×ß} then go to L2
else begin {×éÖ¯»ØÐÅM,MÖк¬²úÆ·Íê³É´æ·ÅµØµã£¬²úƷ˵Ã÷£¬¹æ¸ñ£¬¼Û¸ñµÈ} send(B,M); end; goto L1 end;
PROCESS consumer; ¡¡
L 3£ºreceive(B£¬Y);
If {YÖбíʾ²úÆ·ÒÑÍê³É} then begin {°´ÐżþÖеØÖ·È¡³ö±ÈÎïÆ·, ×éÖ¯»ØÐÅM£»»ØÐÅÖбíʾÎïÆ·ÒÑÈ¡×ߣ¬²¢·´Ó³¶Ô²úÆ·µÄÆÀ¼ÛºÍ´¦ÀíÇé¿ö} send(B£¬m); goto L3; end; ¡¡. End; end;
µÚ¾ÅÕ ËÀËø Á·Ï°Ìâ (Ò»)µ¥ÏîÑ¡ÔñÌâ
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2£®ËÀËøµÄ·ÀÖ¹ÊǸù¾Ý( )²ÉÈ¡´ëʩʵÏֵġ£ A£®ÅäÖÃ×ã¹»µÄϵͳ×ÊÔ´ B£®Ê¹½ø³ÌµÄÍÆ½øË³ÐòºÏÀí C£®ÆÆ»µ²úÉúËÀËøµÄËĸö±ØÒªÌõ¼þÖ®Ò» D£®·Àֹϵͳ½øÈë²»°²È«×´Ì¬
3£®²ÉÓð´Ðò·ÖÅä×ÊÔ´µÄ²ßÂÔ¿ÉÒÔ·ÀÖ¹ËÀËø£®ÕâÊÇÀûÓÃÁËʹ( )Ìõ¼þ²»³ÉÁ¢¡£ A£®»¥³âʹÓÃ×ÊÔ´ BÑ»·µÈ´ý×ÊÔ´ c£®²»¿ÉÇÀ¶á×ÊÔ´ D£®Õ¼Óв¢µÈ´ý×ÊÔ´
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