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Kernel as a monitor

running. ready. CPU. Kernel as a monitor. signal (sem2). wait (sem2). sem2. wait (sem1). signal (sem1). sem1. suspend. resume. suspend. create. kill. pid qkey qnext qprev. 0. 1. 2 25 33 4. 3. 4 14 2 32.

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Kernel Queues

pid qkey qnext qprev. 0. 1. 2 25 33 4. 3. 4 14 2 32. 5. NPROC - 1. NPROC. Head at 32 MININT 4 ^. Tail at 33 MAXINT ^ 2. Queue as a linked list. Head = 32. Tail = 33. 4.

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mem.h

mem.h. #define roundew(x) ( (3 + (WORD)(x)) & (~3) ) #define truncew(x) ( ((WORD)(x)) & (~3) ) #define getstk(n) getmem(n) #define freestk(b,s) freemem(b,s) typedef struct mblock { struct mblock *mnext; word mlen; } MBLOCK; #define end endaddr /* avoid C library conflict */

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Struct pentry - PowerPoint PPT Presentation

Kernel as a monitor

Kernel Queues

mem.h