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CK_EPOCH_BARRIER(3) | Library Functions Manual | CK_EPOCH_BARRIER(3) |
NAME¶
ck_epoch_barrier
—
block until a grace period and all callbacks have been
dispatched
LIBRARY¶
Concurrency Kit (libck, -lck)
SYNOPSIS¶
#include
<ck_epoch.h>
void
ck_epoch_barrier
(ck_epoch_record_t
*record);
DESCRIPTION¶
The
ck_epoch_barrier
(3)
function will block the caller until a grace period has been detected,
according to the semantics of epoch reclamation. Any objects requiring safe
memory reclamation which are logically deleted are safe for physical
deletion following a call to
ck_epoch_barrier
(3). This
function will also dispatch all callbacks associated with
epoch that were previously scheduled via
ck_epoch_call
(3).
EXAMPLE¶
#include <ck_epoch.h> #include <ck_stack.h> #include <stdlib.h> /* * epoch was previously initialized with ck_epoch_init. * stack was previously initialized with ck_stack_init. */ ck_epoch_t *epoch; ck_stack_t *stack; void function(void) { ck_epoch_record_t *record; ck_stack_entry_t *s; record = malloc(sizeof *record); ck_epoch_register(&epoch, record); /* * We are using an epoch section here to guarantee no * nodes in the stack are deleted while we are dereferencing * them. This is needed here because there are multiple writers. * If there was only one thread popping from the this stack, * then there is no need to ck_epoch_begin/ck_epoch_end. */ ck_epoch_begin(record); /* Logically delete an object. */ s = ck_stack_pop_upmc(stack); ck_epoch_end(record); /* * Wait until no threads could possibly have a reference to the * object we just popped (assume all threads are simply executing * ck_stack_pop_upmc). */ ck_epoch_barrier(record); /* It is now safe to physically delete the object. */ free(s); return; }
RETURN VALUES¶
This function has no return value.
ERRORS¶
Behavior is undefined if the object pointed to by
epoch is not a valid epoch object. 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_call(3), ck_epoch_begin(3), ck_epoch_end(3)
Additional information available at http://concurrencykit.org/
September 2, 2012 |