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Man Pages


Manual Reference Pages  -  CK_EPOCH_CALL (3)

NAME

ck_epoch_call - defer function execution until a grace period

CONTENTS

Library
Synopsis
Description
Example
Return Values
Errors
See Also

LIBRARY

Concurrency Kit (libck, -lck)

SYNOPSIS


.In 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/

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