c2be104821
on SENDREC system calls. To be done: resource (buffer pool) management; make it structurally impossible to run out of buffers.
149 lines
6.3 KiB
C
Executable file
149 lines
6.3 KiB
C
Executable file
#ifndef PROC_H
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#define PROC_H
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/* Here is the declaration of the process table. It contains the process'
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* registers, memory map, accounting, and message send/receive information.
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* Many assembly code routines reference fields in it. The offsets to these
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* fields are defined in the assembler include file sconst.h. When changing
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* 'proc', be sure to change sconst.h to match.
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*
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* Changes:
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* May 24, 2005 new field for pending notifications (Jorrit N. Herder)
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* Nov 10, 2004 separated process types/ priorities (Jorrit N. Herder)
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* Sep 24, 2004 one timer per type of alarm (Jorrit N. Herder)
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* May 01, 2004 new p_sendmask to protect syscalls (Jorrit N. Herder)
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*/
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#include <minix/com.h>
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#include "protect.h"
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#include "const.h"
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struct proc {
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struct stackframe_s p_reg; /* process' registers saved in stack frame */
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#if (CHIP == INTEL)
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reg_t p_ldt_sel; /* selector in gdt with ldt base and limit */
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struct segdesc_s p_ldt[2+NR_REMOTE_SEGS]; /* CS, DS and remote segments */
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#endif /* (CHIP == INTEL) */
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#if (CHIP == M68000)
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/* M68000 specific registers and FPU details go here. */
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#endif /* (CHIP == M68000) */
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reg_t *p_stguard; /* stack guard word */
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proc_nr_t p_nr; /* number of this process (for fast access) */
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struct mem_map p_memmap[NR_LOCAL_SEGS]; /* local memory map (T, D, S) */
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struct far_mem p_farmem[NR_REMOTE_SEGS]; /* remote memory map */
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char p_flags; /* SENDING, RECEIVING, etc. */
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char p_type; /* task, system, driver, server, user, idle */
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char p_priority; /* scheduling priority */
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clock_t user_time; /* user time in ticks */
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clock_t sys_time; /* sys time in ticks */
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clock_t child_utime; /* cumulative user time of children */
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clock_t child_stime; /* cumulative sys time of children */
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timer_t p_signalrm; /* signal alarm timer */
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timer_t p_flagalrm; /* flag alarm timer */
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timer_t p_syncalrm; /* synchronous alarm timer */
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struct proc *p_nextready; /* pointer to next ready process */
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struct notification *p_ntf_q; /* queue of pending notifications */
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struct proc *p_caller_q; /* head of list of procs wishing to send */
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struct proc *p_q_link; /* link to next proc wishing to send */
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message *p_messbuf; /* pointer to message buffer */
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proc_nr_t p_getfrom; /* from whom does process want to receive? */
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proc_nr_t p_sendto; /* to whom does process want to send? */
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send_mask_t p_sendmask; /* mask indicating to whom proc may send */
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sigset_t p_pending; /* bit map for pending signals */
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unsigned p_pendcount; /* count of pending and unfinished signals */
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char p_name[PROC_NAME_LEN]; /* name of the process, including \0 */
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#if ENABLE_K_DEBUGGING
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int p_ready, p_found;
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#endif
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};
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/* Guard word for task stacks. */
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#define STACK_GUARD ((reg_t) (sizeof(reg_t) == 2 ? 0xBEEF : 0xDEADBEEF))
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/* Bits for p_flags in proc[]. A process is runnable iff p_flags == 0. */
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#define NO_MAP 0x01 /* keeps unmapped forked child from running */
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#define SENDING 0x02 /* process blocked trying to SEND */
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#define RECEIVING 0x04 /* process blocked trying to RECEIVE */
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#define PENDING 0x10 /* set when inform() of signal pending */
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#define SIG_PENDING 0x20 /* keeps to-be-signalled proc from running */
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#define P_STOP 0x40 /* set when process is being traced */
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/* Values for p_type. Non-negative values represent active process types.
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* Process types are important to model inter-process relationships. When
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* MINIX is shutdown, all system services are notified in order of possible
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* dependencies, so that, e.g., the FS can rely on drivers to synchronize.
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*/
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#define P_RESERVED -2 /* slot is not in use, but reserved */
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#define P_NONE -1 /* slot is not in use, and free */
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#define P_TASK 0 /* kernel process */
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#define P_SYSTEM 1 /* low-level system service */
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#define P_DRIVER 2 /* device driver */
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#define P_SERVER 3 /* system service outside the kernel */
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#define P_USER 4 /* user process */
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#define P_IDLE 5 /* idle process */
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/* Scheduling priorities for p_priority. Values must start at zero and
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* increment. Priorities of system services can be set in the task table.
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* Task, user, and idle priorities are fixed; the rest can be selected.
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*/
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#define PPRI_TASK 0 /* reserved for kernel tasks */
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#define PPRI_HIGHER 1
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#define PPRI_HIGH 2
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#define PPRI_NORMAL 3
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#define PPRI_LOW 4
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#define PPRI_LOWER 5
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#define PPRI_USER 6 /* reserved for user processes */
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#define PPRI_IDLE 7 /* only IDLE process goes here */
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#define NR_SCHED_QUEUES 8 /* MUST equal minimum priority + 1 */
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/* Magic process table addresses. */
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#define BEG_PROC_ADDR (&proc[0])
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#define BEG_USER_ADDR (&proc[NR_TASKS])
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#define END_PROC_ADDR (&proc[NR_TASKS + NR_PROCS])
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#define NIL_PROC ((struct proc *) 0)
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#define isidlehardware(n) ((n) == IDLE || (n) == HARDWARE)
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#define isokprocn(n) ((unsigned) ((n) + NR_TASKS) < NR_PROCS + NR_TASKS)
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#define isokprocp(p) ((p) >= BEG_PROC_ADDR && (p) < END_PROC_ADDR)
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#define isoksrc_dst(n) (isokprocn(n) || (n) == ANY)
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#define isalive(n) (proc_addr(n)->p_type > P_NONE)
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#define isalivep(p) ((p)->p_type > P_NONE)
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#define isrxhardware(n) ((n) == ANY || (n) == HARDWARE)
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#define isreservedp(p) ((p)->p_type == P_RESERVED)
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#define isemptyp(p) ((p)->p_type == P_NONE)
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#define istaskp(p) ((p)->p_type == P_TASK)
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#define isdriverp(p) ((p)->p_type == P_DRIVER)
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#define isserverp(p) ((p)->p_type == P_SERVER)
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#define isuserp(p) ((p)->p_type == P_USER)
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#define isuser(n) (proc_addr(n)->p_type == P_USER)
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#define isidlep(p) ((p)->p_type == P_IDLE)
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#define cproc_addr(n) (&(proc + NR_TASKS)[(n)])
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#define proc_addr(n) (pproc_addr + NR_TASKS)[(n)]
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#define proc_nr(p) ((p)->p_nr)
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#define iskernelp(p) ((p)->p_nr < 0)
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#define iskernel(n) ((n) == CLOCK || (n) == SYSTASK)
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/* The process table and pointers to process table slots. The pointers allow
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* faster access because now a process entry can be found by indexing the
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* pproc_addr array, while accessing an element i requires a multiplication
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* with sizeof(struct proc) to determine the address.
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*/
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EXTERN struct proc proc[NR_TASKS + NR_PROCS]; /* process table */
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EXTERN struct proc *pproc_addr[NR_TASKS + NR_PROCS];
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EXTERN struct proc *bill_ptr; /* ptr to process to bill for clock ticks */
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EXTERN struct proc *rdy_head[NR_SCHED_QUEUES]; /* ptrs to ready list headers */
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EXTERN struct proc *rdy_tail[NR_SCHED_QUEUES]; /* ptrs to ready list tails */
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#endif /* PROC_H */
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