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Checks for compiler supported atomic operations comes from client_t.h.
An example usage of this change can be found in adding reference
counting to "struct auth_cache_entry" in http://review.gluster.org/11023
Basic usage looks like this:
#include "refcount.h"
struct my_struct {
GF_REF_DECL;
... /* more members */
}
void my_destructor (void *data)
{
struct my_struct *my_ptr = (struct my_struct *) data;
... /* do some more cleanups */
GF_FREE (my_ptr);
}
void init_ptr (struct parent *parent)
{
struct my_struct *my_ptr = malloc (sizeof (struct my_struct));
GF_REF_INIT (my_ptr, my_destructor); /* refcount is set to 1 */
... /* my_ptr probably gets added to some parent structure */
parent_add_ptr (parent, my_ptr);
}
void do_something (struct parent *parent)
{
struct my_struct *my_ptr = NULL;
/* likely need to lock parent, depends on its access pattern */
my_ptr = parent_remove_first_ptr (parent);
/* unlock parent */
... /* do something */
GF_REF_PUT (my_ptr); /* calls my_destructor on refcount = 0 */
}
URL: http://thread.gmane.org/gmane.comp.file-systems.gluster.devel/11202
Change-Id: Idb98a5861a44c31676108ed8876db12c320912ef
BUG: 1228157
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/11022
Reviewed-by: Xavier Hernandez <xhernandez@datalab.es>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
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