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o Teach vm_map_delete() to respect the "in-transition" flag

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on a vm_map_entry by sleeping until the flag is cleared.

Submitted by:	tegge
This commit is contained in:
Alan Cox 2002-06-11 05:24:22 +00:00
parent e98d6424af
commit 73b2bace26
1 changed files with 31 additions and 0 deletions
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31
sys/vm/vm_map.c
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@ -2374,6 +2374,37 @@ vm_map_delete(vm_map_t map, vm_offset_t start, vm_offset_t end)
vm_offset_t s, e;
vm_pindex_t offidxstart, offidxend, count;
/*
* Wait for wiring or unwiring of an entry to complete.
*/
if ((entry->eflags & MAP_ENTRY_IN_TRANSITION) != 0) {
unsigned int last_timestamp;
vm_offset_t saved_start;
vm_map_entry_t tmp_entry;
saved_start = entry->start;
entry->eflags |= MAP_ENTRY_NEEDS_WAKEUP;
last_timestamp = map->timestamp;
(void) vm_map_unlock_and_wait(map, FALSE);
vm_map_lock(map);
if (last_timestamp + 1 != map->timestamp) {
/*
* Look again for the entry because the map was
* modified while it was unlocked.
* Specifically, the entry may have been
* clipped, merged, or deleted.
*/
if (!vm_map_lookup_entry(map, saved_start,
&tmp_entry))
entry = tmp_entry->next;
else {
entry = tmp_entry;
vm_map_clip_start(map, entry,
saved_start);
}
}
continue;
}
vm_map_clip_end(map, entry, end);
s = entry->start;