Implement talloc_pool()

A talloc pool is a chunk of memory that can be used as a context for further
talloc calls. Allocations with the pool as the parent just chew from that
memory by incrementing a pointer. If the talloc pool is full, then we fall back
to the normal system-level malloc(3) to get memory.

The use case for talloc pools is the transient memory that is used for handling
a single SMB request. Incrementing a pointer will be way faster than any malloc
implementation.

There is a downside of this: If you use talloc_steal() to move something out of
the pool, the whole pool memory is kept around until the last object inside the
pool is freed. So if you talloc_free() the pool, it might happen that the
memory is freed later. So don't hang anything off a talloc pool that should
live long.

Volker
(This used to be commit 60ef9a84f0bd18d48e453c08aa420d17275e0881)

1 files changed, 1 insertions, 0 deletions

diff --git a/source4/lib/talloc/talloc.h b/source4/lib/talloc/talloc.h
index e103391681..5431971655 100644
--- a/source4/lib/talloc/talloc.h
+++ b/source4/lib/talloc/talloc.h
@@ -116,6 +116,7 @@ typedef void TALLOC_CTX;
 
 /* The following definitions come from talloc.c  */
 void *_talloc(const void *context, size_t size);
+void *talloc_pool(const void *context, size_t size);
 void _talloc_set_destructor(const void *ptr, int (*destructor)(void *));
 int talloc_increase_ref_count(const void *ptr);
 size_t talloc_reference_count(const void *ptr);