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Fixed bad boundary condition, support for asynchronous I/O.

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This commit is contained in:
Philip Homburg 2007-04-23 14:23:37 +00:00
parent c7a7c0cb17
commit 47233bdf30
1 changed files with 14 additions and 3 deletions
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17
kernel/system.c
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@ -211,10 +211,14 @@ int proc_type; /* system or user process flag */
if (proc_type == SYS_PROC) { /* find a new slot */
for (sp = BEG_PRIV_ADDR; sp < END_PRIV_ADDR; ++sp)
if (sp->s_proc_nr == NONE && sp->s_id != USER_PRIV_ID) break;
if (sp->s_proc_nr != NONE) return(ENOSPC);
if (sp >= END_PRIV_ADDR) return(ENOSPC);
rc->p_priv = sp; /* assign new slot */
rc->p_priv->s_proc_nr = proc_nr(rc); /* set association */
rc->p_priv->s_flags = SYS_PROC; /* mark as privileged */
/* Clear some fields */
sp->s_asyntab= -1;
sp->s_asynsize= 0;
} else {
rc->p_priv = &priv[USER_PRIV_ID]; /* use shared slot */
rc->p_priv->s_proc_nr = INIT_PROC_NR; /* set association */
@ -291,6 +295,9 @@ int sig_nr; /* signal to be sent, 1 to _NSIG */
*/
register struct proc *rp;
if (proc_nr == PM_PROC_NR)
panic("cause_sig: PM gets signal", NO_NUM);
/* Check if the signal is already pending. Process it otherwise. */
rp = proc_addr(proc_nr);
if (! sigismember(&rp->p_pending, sig_nr)) {
@ -476,6 +483,12 @@ register struct proc *rc; /* slot of process to clean up */
/* Make sure that the exiting process is no longer scheduled. */
RTS_LOCK_SET(rc, NO_ENDPOINT);
if (priv(rc)->s_flags & SYS_PROC)
{
if (priv(rc)->s_asynsize)
kprintf("clear_endpoint: clearing s_asynsize\n");
priv(rc)->s_asynsize= 0;
}
/* If the process happens to be queued trying to send a
* message, then it must be removed from the message queues.
@ -529,5 +542,3 @@ register struct proc *rc; /* slot of process to clean up */
}
}
}