{"id":791,"date":"2007-12-10T15:55:00","date_gmt":"2007-12-10T15:55:00","guid":{"rendered":"\/post\/1386\/09\/19\/daa9d8a7d8b1d8a8d8b1d8af-Lock-Statement"},"modified":"2007-12-10T15:55:00","modified_gmt":"2007-12-10T15:55:00","slug":"%da%a9%d8%a7%d8%b1%d8%a8%d8%b1%d8%af-lock-statement","status":"publish","type":"post","link":"https:\/\/mesbahi.net\/fa\/blog\/1386\/09\/19\/%da%a9%d8%a7%d8%b1%d8%a8%d8%b1%d8%af-lock-statement\/","title":{"rendered":"\u06a9\u0627\u0631\u0628\u0631\u062f Lock Statement"},"content":{"rendered":"![\"c\"](\"http:\/\/mesbahi.net\/fa\/wp-content\/uploads\/sites\/3\/pictures\/migration\/WindowsLiveWriter\/LockStatement_E00B\/c_3.png\")
\u06cc\u06a9\u06cc \u0627\u0632 \u062e\u0635\u0648\u0635\u06cc\u0627\u062a \u062c\u0627\u0644\u0628\u06cc \u06a9\u0647 \u062f\u0631 \u0627\u06a9\u062b\u0631 \u0628\u0631\u0646\u0627\u0645\u0647 \u0646\u0648\u06cc\u0633 \u0647\u0627\u06cc \u0627\u06cc\u0631\u0627\u0646\u06cc \u062f\u06cc\u062f\u0647 \u0645\u06cc\u0634\u0647 \u0627\u06cc\u0646\u0647 \u06a9\u0647 \u0647\u0645\u0647 \u0686\u06cc\u0632 \u0631\u0648 \u062f\u0631 \u062d\u0627\u0644\u062a \u0627\u06cc\u062f\u0647 \u0622\u0644 \u062f\u0631 \u0646\u0638\u0631 \u0645\u06cc \u06af\u06cc\u0631\u0646 \u0648 \u0628\u0647 \u0647\u0645\u06cc\u0646 \u062f\u0644\u06cc\u0644 \u062f\u0631 \u0646\u0631\u0645 \u0627\u0641\u0632\u0627\u0631 \u0647\u0627\u06cc \u062a\u0648\u0644\u06cc\u062f \u062f\u0627\u062e\u0644 \u0639\u0644\u0627\u0648\u0647 \u0628\u0631 \u0645\u0633\u0627\u0626\u0644\u06cc \u0645\u062b\u0644 \u0646\u0627\u062f\u06cc\u062f\u0647 \u06af\u0631\u0641\u062a\u0646 \u0634\u06cc\u0621 \u06af\u0631\u0627\u06cc\u06cc \u0648… exception handling \u0631\u0648 \u0645\u06cc\u0634\u0647 \u06cc\u06a9\u06cc \u0627\u0632 \u06cc\u062a\u06cc\u0645 \u062a\u0631\u06cc\u0646 \u0645\u0648\u0636\u0648\u0639\u0627\u062a \u067e\u0631\u0648\u0633\u0647 \u062a\u0648\u0644\u06cc\u062f \u062f\u0631 \u0646\u0638\u0631 \u06af\u0631\u0641\u062a. <\/p>\n
\u062f\u0631 \u0637\u0648\u0644 \u062f\u0648\u0631\u0627\u0646\u06cc \u06a9\u0647 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u0634\u0627\u0648\u0631\u062f\u0631 \u06a9\u0646\u0627\u0631 \u062a\u06cc\u0645 \u0647\u0627 \u06a9\u0627\u0631 \u0645\u06cc\u06a9\u0646\u0645 \u0628\u0647 \u06a9\u0631\u0627\u062a \u062f\u06cc\u062f\u0647 \u0627\u0645 \u06a9\u0647 \u0646\u0631\u0645 \u0627\u0641\u0632\u0627\u0631 \u062f\u0686\u0627\u0631 \u0645\u0634\u06a9\u0644 \u0634\u062f\u0647 \u0627\u0648\u0646\u0645 \u0628\u0647 \u062e\u0627\u0637\u0631 \u0639\u062f\u0645 \u067e\u06cc\u0634 \u0628\u06cc\u0646\u06cc \u062e\u0637\u0627\u0647\u0627 \u06cc\u0627 \u0645\u0648\u0627\u0631\u062f \u062e\u0627\u0635\u06cc \u06a9\u0647 \u062f\u0631 \u062d\u06cc\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0627\u0631\u0628\u0631 \u067e\u06cc\u0634 \u0645\u06cc\u0627\u062f. \u06cc\u06a9\u06cc \u0627\u0632 \u0627\u0645\u06a9\u0627\u0646\u0627\u062a #C \u06a9\u0647 \u0645\u062a\u0627\u0633\u0641\u0627\u0646\u0647 \u06a9\u0645\u062a\u0631 \u0627\u0632\u0634 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc\u0634\u0647 Lock \u06a9\u0631\u062f\u0646 \u0622\u0628\u062c\u06a9\u062a \u0647\u0627\u0633\u062a. <\/p>\n
Lock \u0686\u06cc\u0633\u062a \u061f \u0648 \u0686\u0631\u0627 Lock \u061f
Lock \u0645\u0648\u062c\u0628 \u0627\u0637\u0645\u06cc\u0646\u0627\u0646 \u0627\u0632 \u0639\u062f\u0645 \u0627\u0645\u06a9\u0627\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u062a\u0631\u062f\u0647\u0627 (Thread) \u0627\u0632 \u0642\u0637\u0639\u0647 \u06a9\u062f\u06cc \u0645\u06cc \u0634\u0648\u062f \u06a9\u0647 \u062f\u0631 \u0648\u0636\u0639\u06cc\u062a \u0628\u062d\u0631\u0627\u0646\u06cc \u0628\u0647 \u0633\u0631 \u0645\u06cc \u0628\u0631\u062f (\u0648\u0636\u0639\u06cc\u062a \u0628\u062d\u0631\u0627\u0646\u06cc \u062a\u0639\u0628\u06cc\u0631 \u062e\u0648\u062f \u0645\u0627\u06cc\u06a9\u0631\u0648\u0633\u0627\u0641\u062a\u0647\u060c \u0628\u0647 \u0639\u0628\u0627\u0631\u062a \u062f\u06cc\u06af\u0631 \u06a9\u062f\u06cc \u06a9\u0647 \u0628\u0627\u06cc\u062f Block \u0628\u0645\u0648\u0646\u0647 \u062a\u0627 \u0648\u0636\u0639\u06cc\u062a\u0634 \u0645\u0634\u062e\u0635 \u0634\u0647) . Lock \u06a9\u0631\u062f\u0646 \u0622\u0628\u062c\u06a9\u062a \u0628\u0627\u0639\u062b \u0627\u0646\u062a\u0638\u0627\u0631 \u0648 \u06cc\u0627 \u0628\u0644\u0648\u06a9\u0647 \u0634\u062f\u0646 \u062a\u0631\u062f\u06cc \u06a9\u0647 \u0645\u06cc \u062e\u0648\u0627\u0647\u062f \u0627\u0632 \u0622\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u062f\u060c \u062a\u0627 \u0632\u0645\u0627\u0646 \u0622\u0632\u0627\u062f \u0634\u062f\u0646 \u0622\u0628\u062c\u06a9\u062a \u0645\u06cc \u0634\u0648\u062f. <\/p>\n
\u0645\u062b\u0627\u0644 \u0632\u06cc\u0631 \u0645\u0648\u0636\u0648\u0639 \u0631\u0648 \u0628\u0647 \u0635\u0648\u0631\u062a \u06a9\u0627\u0645\u0644\u0627 \u06a9\u0627\u0631\u0628\u0631\u062f\u06cc \u062e\u0648\u0627\u0647\u062f \u062f\u0627\u062f : <\/p>\n
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1:<\/span> \/\/ Lock \u0645\u062b\u0627\u0644<\/span><\/pre>\n 2:<\/span> using<\/span> System;<\/pre>\n 3:<\/span> using<\/span> System.Threading;<\/pre>\n 4:<\/span> <\/pre>\n 5:<\/span> class<\/span> Account<\/pre>\n 6:<\/span> {<\/pre>\n 7:<\/span> private<\/span> Object thisLock = new<\/span> Object();<\/pre>\n 8:<\/span> int<\/span> balance;<\/pre>\n 9:<\/span> <\/pre>\n 10:<\/span> Random r = new<\/span> Random();<\/pre>\n 11:<\/span> <\/pre>\n 12:<\/span> public<\/span> Account(int<\/span> initial)<\/pre>\n 13:<\/span> {<\/pre>\n 14:<\/span> balance = initial;<\/pre>\n 15:<\/span> }<\/pre>\n 16:<\/span> <\/pre>\n 17:<\/span> int<\/span> Withdraw(int<\/span> amount)<\/pre>\n 18:<\/span> {<\/pre>\n 19:<\/span> <\/pre>\n 20:<\/span> \/\/ \u0627\u06cc\u0646 \u0634\u0631\u0637 \u0647\u0631\u06af\u0632 \u0628\u0631\u0642\u0631\u0627\u0631 \u0646\u062e\u0648\u0627\u0647\u062f \u0634\u062f \u0645\u06af\u0631 \u0627\u06cc\u0646\u06a9\u0647 \u0628\u062e\u0634 \u0644\u0627\u06a9 \u0641\u0639\u0627\u0644 \u0634\u0648\u062f<\/span><\/pre>\n 21:<\/span> <\/pre>\n 22:<\/span> if<\/span> (balance < 0)<\/pre>\n 23:<\/span> {<\/pre>\n 24:<\/span> throw<\/span> new<\/span> Exception("Negative Balance"<\/span>);<\/pre>\n 25:<\/span> }<\/pre>\n 26:<\/span> <\/pre>\n 27:<\/span> \/\/ \u062a\u0627\u062b\u06cc\u0631 \u0644\u0627\u06a9 \u0631\u0627 \u062f\u0631 \u062e\u0637\u0648\u0637 \u0628\u0639\u062f \u062e\u0648\u0627\u0647\u06cc\u062f \u062f\u06cc\u062f<\/span><\/pre>\n 28:<\/span> <\/pre>\n 29:<\/span> lock<\/span>(thisLock)<\/pre>\n 30:<\/span> {<\/pre>\n 31:<\/span> if<\/span> (balance >= amount)<\/pre>\n 32:<\/span> {<\/pre>\n 33:<\/span> Console.WriteLine("Balance before Withdrawal : "<\/span> + balance);<\/pre>\n 34:<\/span> Console.WriteLine("Amount to Withdraw : -"<\/span> + amount);<\/pre>\n 35:<\/span> balance = balance - amount;<\/pre>\n 36:<\/span> Console.WriteLine("Balance after Withdrawal : "<\/span> + balance);<\/pre>\n 37:<\/span> return<\/span> amount;<\/pre>\n 38:<\/span> }<\/pre>\n 39:<\/span> else<\/span><\/pre>\n 40:<\/span> {<\/pre>\n 41:<\/span> return<\/span> 0; \/\/ \u062a\u0631\u0627\u06a9\u0646\u0634 \u0631\u062f \u062e\u0648\u0627\u0647\u062f \u0634\u062f<\/span><\/pre>\n 42:<\/span> }<\/pre>\n 43:<\/span> }<\/pre>\n 44:<\/span> }<\/pre>\n 45:<\/span> <\/pre>\n 46:<\/span> public<\/span> void<\/span> DoTransactions()<\/pre>\n 47:<\/span> {<\/pre>\n 48:<\/span> for<\/span> (int<\/span> i = 0; i < 100; i++)<\/pre>\n 49:<\/span> {<\/pre>\n 50:<\/span> Withdraw(r.Next(1, 100));<\/pre>\n 51:<\/span> }<\/pre>\n 52:<\/span> }<\/pre>\n 53:<\/span> }<\/pre>\n 54:<\/span> <\/pre>\n 55:<\/span> class<\/span> Test<\/pre>\n 56:<\/span> {<\/pre>\n 57:<\/span> static<\/span> void<\/span> Main()<\/pre>\n 58:<\/span> {<\/pre>\n 59:<\/span> Thread[] threads = new<\/span> Thread[10];<\/pre>\n 60:<\/span> Account acc = new<\/span> Account(1000);<\/pre>\n 61:<\/span> for<\/span> (int<\/span> i = 0; i < 10; i++)<\/pre>\n 62:<\/span> {<\/pre>\n 63:<\/span> Thread t = new<\/span> Thread(new<\/span> ThreadStart(acc.DoTransactions));<\/pre>\n 64:<\/span> threads[i] = t;<\/pre>\n 65:<\/span> }<\/pre>\n 66:<\/span> for<\/span> (int<\/span> i = 0; i < 10; i++)<\/pre>\n 67:<\/span> {<\/pre>\n 68:<\/span> threads[i].Start();<\/pre>\n 69:<\/span> }<\/pre>\n 70:<\/span> }<\/pre>\n 71:<\/span> }<\/pre>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n