table of contents
CK_EPOCH_CALL(3) | Library Functions Manual | CK_EPOCH_CALL(3) |
NAME¶
ck_epoch_call
—
defer function execution until a grace period
LIBRARY¶
Concurrency Kit (libck, -lck)
SYNOPSIS¶
#include
<ck_epoch.h>
typedef struct ck_epoch_entry
ck_epoch_entry_t;
typedef void ck_epoch_cb_t(ck_epoch_entry_t *);
void
ck_epoch_call
(ck_epoch_record_t
*record, ck_epoch_entry_t
*entry, ck_epoch_cb_t
*function);
DESCRIPTION¶
The
ck_epoch_call
(3)
function will defer the execution of the function pointed to by
function until a grace-period has been detected in
epoch. The function will be provided the pointer
specified by entry. The function will execute at some
time in the future via calls to
ck_epoch_reclaim
(3),
ck_epoch_barrier
(3)
or
ck_epoch_poll
(3).
EXAMPLE¶
#include <ck_epoch.h> #include <ck_stack.h> #include <stdlib.h> /* * epoch was previously initialized with ck_epoch_init. */ ck_epoch_t *epoch; struct object { int value; ck_epoch_entry_t epoch_entry; }; static struct object *global; CK_EPOCH_CONTAINER(struct object, epoch_entry, object_container) void destroy_object(ck_epoch_entry_t *e) { struct object *o = object_container(e); free(o); return; } void function(void) { ck_epoch_record_t *record; struct object *n; record = malloc(sizeof *record); ck_epoch_register(&epoch, record); n = malloc(sizeof *n); if (n == NULL) return; n->value = 1; /* * We are using an epoch section here because there are multiple * writers. It is also an option to use other forms of blocking * write-side synchronization such as mutexes. */ ck_epoch_begin(record); n = ck_pr_fas_ptr(&global, n); ck_epoch_end(record); /* Defer destruction of previous object. */ ck_epoch_call(record, &n->epoch_entry, destroy_object); /* Poll epoch sub-system in non-blocking manner. */ ck_epoch_poll(record); return; }
RETURN VALUES¶
This function has no return value.
ERRORS¶
The object pointed to by record must have
been previously registered via
ck_epoch_register
(3).
SEE ALSO¶
ck_epoch_init(3), ck_epoch_register(3), ck_epoch_unregister(3), ck_epoch_recycle(3), ck_epoch_poll(3), ck_epoch_synchronize(3), ck_epoch_reclaim(3), ck_epoch_barrier(3), ck_epoch_begin(3), ck_epoch_end(3)
Additional information available at http://concurrencykit.org/
September 2, 2012 |