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Ignore whitespace Rev 37 → Rev 38

/shark/trunk/kernel/modules/posix.c
20,11 → 20,11
 
/**
------------
CVS : $Id: posix.c,v 1.3 2002-11-11 08:32:06 pj Exp $
CVS : $Id: posix.c,v 1.4 2003-01-07 17:07:50 pj Exp $
 
File: $File$
Revision: $Revision: 1.3 $
Last update: $Date: 2002-11-11 08:32:06 $
Revision: $Revision: 1.4 $
Last update: $Date: 2003-01-07 17:07:50 $
------------
 
This file contains the scheduling module compatible with POSIX
63,6 → 63,7
#include <kernel/descr.h>
#include <kernel/var.h>
#include <kernel/func.h>
#include <kernel/trace.h>
 
/*+ Status used in the level +*/
#define POSIX_READY MODULE_STATUS_BASE
88,53 → 89,11
 
} POSIX_level_des;
 
static char *POSIX_status_to_a(WORD status)
{
if (status < MODULE_STATUS_BASE)
return status_to_a(status);
 
switch (status) {
case POSIX_READY: return "POSIX_Ready";
default : return "POSIX_Unknown";
}
}
 
static int POSIX_level_accept_task_model(LEVEL l, TASK_MODEL *m)
{
if (m->pclass == NRT_PCLASS || m->pclass == (NRT_PCLASS | l))
return 0;
else
return -1;
}
 
static int POSIX_level_accept_guest_model(LEVEL l, TASK_MODEL *m)
{
return -1;
}
 
static void POSIX_level_status(LEVEL l)
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
PID p;
 
kern_printf("Slice: %d \n", lev->slice);
 
for (p=0; p<MAX_PROC; p++)
if (proc_table[p].task_level == l && proc_table[p].status != POSIX_READY
&& proc_table[p].status != FREE )
kern_printf("Pid: %d\t Name: %20s Prio: %3d Status: %s\n",
p,proc_table[p].name,
lev->priority[p],
POSIX_status_to_a(proc_table[p].status));
 
}
 
 
/* This is not efficient but very fair :-)
The need of all this stuff is because if a task execute a long time
due to (shadow!) priority inheritance, then the task shall go to the
tail of the queue many times... */
static PID POSIX_level_scheduler(LEVEL l)
static PID POSIX_public_scheduler(LEVEL l)
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
 
166,19 → 125,15
}
}
 
static int POSIX_level_guarantee(LEVEL l, bandwidth_t *freebandwidth)
static int POSIX_public_create(LEVEL l, PID p, TASK_MODEL *m)
{
/* the POSIX level always guarantee... the function is defined because
there can be an aperiodic server at a level with less priority than
the POSIX that need guarantee (e.g., a TBS server) */
return 1;
}
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
NRT_TASK_MODEL *nrt;
 
if (m->pclass != NRT_PCLASS) return -1;
if (m->level != 0 && m->level != l) return -1;
 
static int POSIX_task_create(LEVEL l, PID p, TASK_MODEL *m)
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
NRT_TASK_MODEL *nrt = (NRT_TASK_MODEL *)m;
nrt = (NRT_TASK_MODEL *)m;
 
/* the task state is set at SLEEP by the general task_create */
 
223,20 → 178,8
return 0; /* OK */
}
 
static void POSIX_task_detach(LEVEL l, PID p)
static void POSIX_public_dispatch(LEVEL l, PID p, int nostop)
{
/* the POSIX level doesn't introduce any new field in the TASK_MODEL
so, all detach stuffs are done by the task_create
The task state is set at FREE by the general task_create */
}
 
static int POSIX_task_eligible(LEVEL l, PID p)
{
return 0; /* if the task p is chosen, it is always eligible */
}
 
static void POSIX_task_dispatch(LEVEL l, PID p, int nostop)
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
 
/* the task state is set EXE by the scheduler()
245,7 → 188,7
iq_extract(p, &lev->ready[lev->priority[p]]);
}
 
static void POSIX_task_epilogue(LEVEL l, PID p)
static void POSIX_public_epilogue(LEVEL l, PID p)
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
 
266,7 → 209,7
proc_table[p].status = POSIX_READY;
}
 
static void POSIX_task_activate(LEVEL l, PID p)
static void POSIX_public_activate(LEVEL l, PID p)
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
 
278,19 → 221,17
return;
}
 
ll_gettime(TIME_EXACT, &proc_table[p].request_time);
 
/* Insert task in the correct position */
proc_table[p].status = POSIX_READY;
iq_insertlast(p,&lev->ready[lev->priority[p]]);
}
 
static void POSIX_task_insert(LEVEL l, PID p)
static void POSIX_public_unblock(LEVEL l, PID p)
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
 
/* Similar to POSIX_task_activate, but we don't check in what state
the task is and we don't set the request_time */
the task is */
 
/* Insert task in the coPOSIXect position */
proc_table[p].status = POSIX_READY;
297,7 → 238,7
iq_insertlast(p,&lev->ready[lev->priority[p]]);
}
 
static void POSIX_task_extract(LEVEL l, PID p)
static void POSIX_public_block(LEVEL l, PID p)
{
/* Extract the running task from the level
. we have already extract it from the ready queue at the dispatch time.
309,13 → 250,12
*/
}
 
static void POSIX_task_endcycle(LEVEL l, PID p)
static int POSIX_public_message(LEVEL l, PID p, void *m)
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
 
if (lev->nact[p] > 0) {
/* continue!!!! */
ll_gettime(TIME_EXACT, &proc_table[p].request_time);
lev->nact[p]--;
iq_insertfirst(p,&lev->ready[lev->priority[p]]);
proc_table[p].status = POSIX_READY;
322,9 → 262,14
}
else
proc_table[p].status = SLEEP;
 
jet_update_endcycle(); /* Update the Jet data... */
trc_logevent(TRC_ENDCYCLE,&exec_shadow); /* tracer stuff */
 
return 0;
}
 
static void POSIX_task_end(LEVEL l, PID p)
static void POSIX_public_end(LEVEL l, PID p)
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
 
335,46 → 280,6
iq_priority_insert(p,&freedesc);
}
 
static void POSIX_task_sleep(LEVEL l, PID p)
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
lev->nact[p] = 0;
proc_table[p].status = SLEEP;
}
 
 
 
static int POSIX_guest_create(LEVEL l, PID p, TASK_MODEL *m)
{ kern_raise(XINVALID_GUEST,exec_shadow); return 0; }
 
static void POSIX_guest_detach(LEVEL l, PID p)
{ kern_raise(XINVALID_GUEST,exec_shadow); }
 
static void POSIX_guest_dispatch(LEVEL l, PID p, int nostop)
{ kern_raise(XINVALID_GUEST,exec_shadow); }
 
static void POSIX_guest_epilogue(LEVEL l, PID p)
{ kern_raise(XINVALID_GUEST,exec_shadow); }
 
static void POSIX_guest_activate(LEVEL l, PID p)
{ kern_raise(XINVALID_GUEST,exec_shadow); }
 
static void POSIX_guest_insert(LEVEL l, PID p)
{ kern_raise(XINVALID_GUEST,exec_shadow); }
 
static void POSIX_guest_extract(LEVEL l, PID p)
{ kern_raise(XINVALID_GUEST,exec_shadow); }
 
static void POSIX_guest_endcycle(LEVEL l, PID p)
{ kern_raise(XINVALID_GUEST,exec_shadow); }
 
static void POSIX_guest_end(LEVEL l, PID p)
{ kern_raise(XINVALID_GUEST,exec_shadow); }
 
static void POSIX_guest_sleep(LEVEL l, PID p)
{ kern_raise(XINVALID_GUEST,exec_shadow); }
 
 
/* Registration functions */
 
/*+ This init function install the "main" task +*/
405,7 → 310,7
if (p == NIL)
printk("\nPanic!!! can't create main task...\n");
 
POSIX_task_activate(lev,p);
POSIX_public_activate(lev,p);
}
 
 
413,7 → 318,7
TIME slice the slice for the Round Robin queue
int createmain 1 if the level creates the main task 0 otherwise
struct multiboot_info *mb used if createmain specified +*/
void POSIX_register_level(TIME slice,
LEVEL POSIX_register_level(TIME slice,
int createmain,
struct multiboot_info *mb,
int prioritylevels)
425,53 → 330,23
 
printk("POSIX_register_level\n");
 
/* request an entry in the level_table */
l = level_alloc_descriptor();
l = level_alloc_descriptor(sizeof(POSIX_level_des));
 
printk(" alloco descrittore %d %d\n",l,(int)sizeof(POSIX_level_des));
lev = (POSIX_level_des *)level_table[l];
 
/* alloc the space needed for the POSIX_level_des */
lev = (POSIX_level_des *)kern_alloc(sizeof(POSIX_level_des));
 
printk(" lev=%d\n",(int)lev);
 
/* update the level_table with the new entry */
level_table[l] = (level_des *)lev;
 
/* fill the standard descriptor */
strncpy(lev->l.level_name, POSIX_LEVELNAME, MAX_LEVELNAME);
lev->l.level_code = POSIX_LEVEL_CODE;
lev->l.level_version = POSIX_LEVEL_VERSION;
lev->l.public_scheduler = POSIX_public_scheduler;
lev->l.public_create = POSIX_public_create;
lev->l.public_end = POSIX_public_end;
lev->l.public_dispatch = POSIX_public_dispatch;
lev->l.public_epilogue = POSIX_public_epilogue;
lev->l.public_activate = POSIX_public_activate;
lev->l.public_unblock = POSIX_public_unblock;
lev->l.public_block = POSIX_public_block;
lev->l.public_message = POSIX_public_message;
 
lev->l.level_accept_task_model = POSIX_level_accept_task_model;
lev->l.level_accept_guest_model = POSIX_level_accept_guest_model;
lev->l.level_status = POSIX_level_status;
lev->l.level_scheduler = POSIX_level_scheduler;
lev->l.level_guarantee = POSIX_level_guarantee;
 
lev->l.task_create = POSIX_task_create;
lev->l.task_detach = POSIX_task_detach;
lev->l.task_eligible = POSIX_task_eligible;
lev->l.task_dispatch = POSIX_task_dispatch;
lev->l.task_epilogue = POSIX_task_epilogue;
lev->l.task_activate = POSIX_task_activate;
lev->l.task_insert = POSIX_task_insert;
lev->l.task_extract = POSIX_task_extract;
lev->l.task_endcycle = POSIX_task_endcycle;
lev->l.task_end = POSIX_task_end;
lev->l.task_sleep = POSIX_task_sleep;
 
lev->l.guest_create = POSIX_guest_create;
lev->l.guest_detach = POSIX_guest_detach;
lev->l.guest_dispatch = POSIX_guest_dispatch;
lev->l.guest_epilogue = POSIX_guest_epilogue;
lev->l.guest_activate = POSIX_guest_activate;
lev->l.guest_insert = POSIX_guest_insert;
lev->l.guest_extract = POSIX_guest_extract;
lev->l.guest_endcycle = POSIX_guest_endcycle;
lev->l.guest_end = POSIX_guest_end;
lev->l.guest_sleep = POSIX_guest_sleep;
 
/* fill the POSIX descriptor part */
for (i = 0; i < MAX_PROC; i++)
lev->nact[i] = -1;
491,6 → 366,8
 
if (createmain)
sys_atrunlevel(POSIX_call_main,(void *) l, RUNLEVEL_INIT);
 
return l;
}
 
/*+ this function forces the running task to go to his queue tail;
499,13 → 376,6
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
 
if (l < 0 || l >= sched_levels)
return -1;
 
if (level_table[l]->level_code != POSIX_LEVEL_CODE ||
level_table[l]->level_version != POSIX_LEVEL_VERSION )
return -1;
 
if (proc_table[exec_shadow].task_level != l)
return -1;
 
536,13 → 406,6
returns ENOSYS or ESRCH if there are problems +*/
int POSIX_getschedparam(LEVEL l, PID p, int *policy, int *priority)
{
if (l < 0 || l >= sched_levels)
return ENOSYS;
 
if (level_table[l]->level_code != POSIX_LEVEL_CODE ||
level_table[l]->level_version != POSIX_LEVEL_VERSION )
return ENOSYS;
 
if (p<0 || p>= MAX_PROC || proc_table[p].status == FREE)
return ESRCH;
 
564,13 → 427,6
{
POSIX_level_des *lev = (POSIX_level_des *)(level_table[l]);
 
if (l < 0 || l >= sched_levels)
return ENOSYS;
 
if (level_table[l]->level_code != POSIX_LEVEL_CODE ||
level_table[l]->level_version != POSIX_LEVEL_VERSION )
return ENOSYS;
 
if (p<0 || p>= MAX_PROC || proc_table[p].status == FREE)
return ESRCH;