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Kernel: fix notification delivery to non-ANY receivers

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David van Moolenbroek 2011-01-07 17:04:43 +00:00
parent 561acfb618
commit efca30b081
1 changed files with 25 additions and 12 deletions
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37
kernel/proc.c
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@ -796,8 +796,7 @@ PRIVATE int mini_receive(struct proc * caller_ptr,
*/
register struct proc **xpp;
sys_map_t *map;
bitchunk_t *chunk;
int i, r, src_id, src_proc_nr, src_p;
int i, r, src_id, found, src_proc_nr, src_p;
assert(!(caller_ptr->p_misc_flags & MF_DELIVERMSG));
@ -823,24 +822,38 @@ PRIVATE int mini_receive(struct proc * caller_ptr,
/* Check if there are pending notifications, except for SENDREC. */
if (! (caller_ptr->p_misc_flags & MF_REPLY_PEND)) {
map = &priv(caller_ptr)->s_notify_pending;
for (chunk=&map->chunk[0]; chunk<&map->chunk[NR_SYS_CHUNKS]; chunk++) {
endpoint_t hisep;
/* Find a pending notification from the requested source. */
if (! *chunk) continue; /* no bits in chunk */
for (i=0; ! (*chunk & (1<<i)); ++i) {} /* look up the bit */
src_id = (chunk - &map->chunk[0]) * BITCHUNK_BITS + i;
if (src_id >= NR_SYS_PROCS) break; /* out of range */
/* Either check a specific bit in the pending notifications mask, or
* find the first bit set in it (if any), depending on whether the
* receive was called on a specific source endpoint.
*/
if (src_p != ANY) {
src_id = nr_to_id(src_p);
found = get_sys_bit(*map, src_id);
} else {
for (src_id = 0; src_id < NR_SYS_PROCS; src_id += BITCHUNK_BITS) {
if (get_sys_bits(*map, src_id) != 0) {
while (!get_sys_bit(*map, src_id)) src_id++;
break;
}
}
found = (src_id < NR_SYS_PROCS);
}
if (found) {
endpoint_t hisep;
src_proc_nr = id_to_nr(src_id); /* get source proc */
#if DEBUG_ENABLE_IPC_WARNINGS
if(src_proc_nr == NONE) {
printf("mini_receive: sending notify from NONE\n");
}
#endif
if (src_e!=ANY && src_p != src_proc_nr) continue;/* source not ok */
*chunk &= ~(1 << i); /* no longer pending */
unset_sys_bit(*map, src_id); /* no longer pending */
/* Found a suitable source, deliver the notification message. */
hisep = proc_addr(src_proc_nr)->p_endpoint;