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Make the man page reflec t the code a bit better.

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Specifically, note the condition of the memory on initial
and subsequent allocations is different.
This commit is contained in:
julian 2001-12-14 19:19:31 +00:00
parent f7af5c6f92
commit 9e5d1d1b57
1 changed files with 11 additions and 2 deletions
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13
share/man/man9/zone.9
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@ -63,8 +63,11 @@ The zone allocator keeps track of which items are in use and which
aren't, and provides functions for allocating items from the zone and
for releasing them back (which makes them available for later use).
.Pp
The zone allocator stores state information inside the items proper,
so structures that will be managed by the zone allocator must reserve
The zone allocator stores state information inside the items proper
while they are not allocated,
so structures that will be managed by the zone allocator
and wish to use the type stable property of zones by leaving some fields
pre-filled between allocations, must reserve
two pointers at the very beginning for internal use by the zone
allocator, as follows:
.Bd -literal
@ -75,6 +78,12 @@ struct my_item {
};
.Ed
.Pp
Alternatively they should assume those entries corrupted
after each allocation. After the first allocation of an item,
it will have been cleared to zeroes, however subsequent allocations
will retain the contents as of the last free, with the exception of the
fields mentioned above.
.Pp
Zones are created in one of two fashions, depending how far along the
boot process is.
.Pp