code:wakeup - ikarishinjieva/unixV6-code-analyze-chs GitHub Wiki

2109

2110 /*

2111 * Wake up all processes sleeping on chan.

2112 */

2113 wakeup(chan)

2114 {

2115     register struct proc *p;

2116     register c, i;

2117

2118     c = chan;

2119     p = &proc[0];

2120     i = NPROC;

• NPROC为proc数组的大小,值为50,定义见param.h 的0144行

2121     do {

2122               if(p->p_wchan == c) {

2123                    setrun(p);

2124               }

2125               p++;

2126     } while(--i);

2127 }

• 遍历proc数组,遇到因为chan而睡眠的进程时将其置为就绪状态

2128 /* -------------------------*/

• 睡眠原因
• 睡眠优先级

• code:sleep
• code:setrun
• code:exec
• code:exit
• code:stime
• code:clock
• code:stop
• code:ptrace
• code:procxmt
• code:xswap
• code:brelse
• code:iodone
• code:swap
• code:physio
• code:closef
• code:alloc
• code:free
• code:ialloc
• code:readp
• code:writep
• code:prele
• code:klxint
• code:flushtty
• code:ttyinput