diff options
Diffstat (limited to 'manual/memory.texi')
| -rw-r--r-- | manual/memory.texi | 24 |
1 files changed, 2 insertions, 22 deletions
diff --git a/manual/memory.texi b/manual/memory.texi index a3ecc0df7c..92f041ae4d 100644 --- a/manual/memory.texi +++ b/manual/memory.texi @@ -1370,19 +1370,6 @@ should make sure to restore all the hooks to their previous value. When coming back from the recursive call, all the hooks should be resaved since a hook might modify itself. -@comment malloc.h -@comment GNU -@defvar __malloc_initialize_hook -The value of this variable is a pointer to a function that is called -once when the malloc implementation is initialized. This is a weak -variable, so it can be overridden in the application with a definition -like the following: - -@smallexample -void (*@var{__malloc_initialize_hook}) (void) = my_init_hook; -@end smallexample -@end defvar - An issue to look out for is the time at which the malloc hook functions can be safely installed. If the hook functions call the malloc-related functions recursively, it is necessary that malloc has already properly @@ -1393,11 +1380,6 @@ are assigned to @emph{before} the very first @code{malloc} call has completed, because otherwise a chunk obtained from the ordinary, un-hooked malloc may later be handed to @code{__free_hook}, for example. -In both cases, the problem can be solved by setting up the hooks from -within a user-defined function pointed to by -@code{__malloc_initialize_hook}---then the hooks will be set up safely -at the right time. - Here is an example showing how to use @code{__malloc_hook} and @code{__free_hook} properly. It installs a function that prints out information every time @code{malloc} or @code{free} is called. We just @@ -1413,11 +1395,8 @@ static void my_init_hook (void); static void *my_malloc_hook (size_t, const void *); static void my_free_hook (void*, const void *); -/* Override initializing hook from the C library. */ -void (*__malloc_initialize_hook) (void) = my_init_hook; - static void -my_init_hook (void) +my_init (void) @{ old_malloc_hook = __malloc_hook; old_free_hook = __free_hook; @@ -1465,6 +1444,7 @@ my_free_hook (void *ptr, const void *caller) main () @{ + my_init (); @dots{} @} @end smallexample |