198c976f7e
that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
115 lines
4.6 KiB
C
Executable file
115 lines
4.6 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 all process
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* data, including registers, flags, scheduling priority, memory map,
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* accounting, message passing (IPC) information, and so on.
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*
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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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* struct proc, be sure to change sconst.h to match.
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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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#include "priv.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
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#if (CHIP == M68000)
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/* M68000 specific registers and FPU details go here. */
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#endif
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proc_nr_t p_nr; /* number of this process (for fast access) */
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struct priv *p_priv; /* system privileges structure */
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char p_rts_flags; /* SENDING, RECEIVING, etc. */
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char p_priority; /* current scheduling priority */
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char p_max_priority; /* maximum scheduling priority */
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char p_quantum_size; /* quantum size in ticks */
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char p_sched_ticks; /* number of scheduling ticks left */
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char p_full_quantums; /* number of full quantums left */
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struct mem_map p_memmap[NR_LOCAL_SEGS]; /* memory map (T, D, S) */
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clock_t p_user_time; /* user time in ticks */
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clock_t p_sys_time; /* sys time in ticks */
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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 passed 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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sigset_t p_pending; /* bit map for pending kernel signals */
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char p_name[P_NAME_LEN]; /* name of the process, including \0 */
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#if DEBUG_SCHED_CHECK
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int p_ready, p_found;
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#endif
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};
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/* Bits for the runtime flags. A process is runnable iff p_rts_flags == 0. */
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#define SLOT_FREE 0x01 /* process slot is free */
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#define NO_MAP 0x02 /* keeps unmapped forked child from running */
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#define SENDING 0x04 /* process blocked trying to SEND */
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#define RECEIVING 0x08 /* process blocked trying to RECEIVE */
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#define SIGNALED 0x10 /* set when new kernel signal arrives */
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#define SIG_PENDING 0x20 /* unready while signal being processed */
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#define P_STOP 0x40 /* set when process is being traced */
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#define NO_PRIV 0x80 /* privilege structure not yet initialized */
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/* Scheduling priorities for p_priority. Values must start at zero (highest
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* priority) and increment. Priorities of the processes in the boot image can
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* be set in table.c.
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*/
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#define NR_SCHED_QUEUES 16 /* MUST equal minimum priority + 1 */
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#define TASK_Q 0 /* highest, reserved for kernel tasks */
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#define MAX_USER_Q 8 /* highest priority for user processes */
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#define USER_Q 11 /* user default (should correspond to nice 0) */
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#define MIN_USER_Q 14 /* minimum priority for user processes */
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#define IDLE_Q 15 /* lowest, only IDLE process goes here */
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/* Each queue has a maximum number of full quantums associated with it. */
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#define QUANTUMS(q) (NR_SCHED_QUEUES - (q))
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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 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 isokprocn(n) ((unsigned) ((n) + NR_TASKS) < NR_PROCS + NR_TASKS)
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#define isemptyn(n) isemptyp(proc_addr(n))
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#define isemptyp(p) ((p)->p_rts_flags == SLOT_FREE)
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#define iskernelp(p) iskerneln((p)->p_nr)
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#define iskerneln(n) ((n) < 0)
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#define isuserp(p) isusern((p)->p_nr)
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#define isusern(n) ((n) >= 0)
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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 *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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