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RS crash recovery support.

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This commit is contained in:
Cristiano Giuffrida
2010-07-06 22:05:21 +00:00
parent e920c1e1df
commit 1f8dbed029
21 changed files with 429 additions and 200 deletions
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42
kernel/system.c
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@@ -14,6 +14,7 @@
* get_priv: assign privilege structure to user or system process
* set_sendto_bit: allow a process to send messages to a new target
* unset_sendto_bit: disallow a process from sending messages to a target
* fill_sendto_mask: fill the target mask of a given process
* send_sig: send a signal directly to a system process
* cause_sig: take action to cause a signal to occur via a signal mgr
* sig_delay_done: tell PM that a process is not sending
@@ -333,19 +334,35 @@ PUBLIC void unset_sendto_bit(const struct proc *rp, int id)
unset_sys_bit(priv_addr(id)->s_ipc_to, priv_id(rp));
}
/*===========================================================================*
* fill_sendto_mask *
*===========================================================================*/
PUBLIC void fill_sendto_mask(const struct proc *rp, int mask)
{
int i;
for (i=0; i < NR_SYS_PROCS; i++) {
if (mask & (1 << i))
set_sendto_bit(rp, i);
else
unset_sendto_bit(rp, i);
}
}
/*===========================================================================*
* send_sig *
*===========================================================================*/
PUBLIC void send_sig(endpoint_t proc_nr, int sig_nr)
PUBLIC void send_sig(endpoint_t ep, int sig_nr)
{
/* Notify a system process about a signal. This is straightforward. Simply
* set the signal that is to be delivered in the pending signals map and
* send a notification with source SYSTEM.
*/
register struct proc *rp;
int proc_nr;
if(!isokprocn(proc_nr) || isemptyn(proc_nr))
panic("send_sig to empty process: %d", proc_nr);
if(!isokendpt(ep, &proc_nr) || isemptyn(proc_nr))
panic("send_sig to empty process: %d", ep);
rp = proc_addr(proc_nr);
(void) sigaddset(&priv(rp)->s_sig_pending, sig_nr);
@@ -372,19 +389,32 @@ int sig_nr; /* signal to be sent */
* only called when a user process causes a CPU exception and from the kernel
* process level, which runs to completion.
*/
register struct proc *rp;
register struct proc *rp, *sig_mgr_rp;
endpoint_t sig_mgr;
int sig_mgr_proc_nr;
/* Lookup signal manager. */
rp = proc_addr(proc_nr);
sig_mgr = priv(rp)->s_sig_mgr;
if(sig_mgr == SELF) sig_mgr = rp->p_endpoint;
/* If the target is the signal manager of itself, send the signal directly. */
if(rp->p_endpoint == sig_mgr) {
if(SIGS_IS_LETHAL(sig_nr)) {
/* If the signal is lethal, see if a backup signal manager exists. */
sig_mgr = priv(rp)->s_bak_sig_mgr;
if(sig_mgr != NONE && isokendpt(sig_mgr, &sig_mgr_proc_nr)) {
priv(rp)->s_sig_mgr = sig_mgr;
priv(rp)->s_bak_sig_mgr = NONE;
sig_mgr_rp = proc_addr(sig_mgr_proc_nr);
RTS_UNSET(sig_mgr_rp, RTS_NO_PRIV);
cause_sig(proc_nr, sig_nr); /* try again with the new sig mgr. */
return;
}
/* We are out of luck. Time to panic. */
proc_stacktrace(rp);
panic("cause_sig: signal manager gets lethal signal %d for itself",
sig_nr);
panic("cause_sig: sig manager %d gets lethal signal %d for itself",
rp->p_endpoint, sig_nr);
}
(void) sigaddset(&priv(rp)->s_sig_pending, sig_nr);
send_sig(rp->p_endpoint, SIGKSIGSM);