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批踢踢實業坊 ask 板
[請問] 軟體的互斥鎖問題
Jul 11th 2013, 23:15, by luxylu

作者luxylu ( 露西露 )

站內ask

標題[請問] 軟體的互斥鎖問題

時間Thu Jul 11 23:15:33 2013

/* program 1 */ turn = 1; Q1 = TRUE; while (turn == 1 && Q2 == TRUE); Critical Section; Q1 = FALSE; /* program 2 */ turn = 2; Q2 = TRUE; while (turn == 2 && Q1 == TRUE); Critical Section; Q2 = FALSE; 這兩個程式用一個processor執行下，會有互斥以進入Critical section時 請問什麼情況下此互斥鎖會失效呢？ 查過了Dekker演算法但看不懂如何操作 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.109.41.16

→ Raist:...一定要問這種高難度的問題來質疑我的智商嗎??? (淚奔~) 07/11 23:24

→ luxylu:我也不想阿.....已經查了三天資料還是看不懂 07/11 23:28

推 wuliou:有第三個process更改了turn的值? 07/11 23:32

→ wuliou:或是碰到非atomic指令? 07/11 23:32

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