bt_get.c File Reference

#include <sys/types.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include "../include/db.h"
#include "btree.h"

Include dependency graph for bt_get.c:

Go to the source code of this file.

Functions
int	__bt_get (DB *dbp, const DBT *key, DBT *data, u_int flags) const

Function Documentation

__bt_get()

int __bt_get	(	DB *	dbp,
		const DBT *	key,
		DBT *	data,
		u_int	flags
	)		const

Definition at line 63 of file bt_get.c.

References __bt_ret(), __bt_search(), B_DB_LOCK, _btree::bt_mp, _btree::bt_pinned, _btree::bt_rdata, errno, F_ISSET, __db::internal, mpool_put(), NULL, _epg::page, RET_ERROR, RET_SPECIAL, and status.

Referenced by __bt_open().

{
   BTREE *t;
   EPG *e;
   int exact, status;

   t = dbp->internal;

   /* Toss any page pinned across calls. */
   if (t->bt_pinned != NULL) {
      mpool_put(t->bt_mp, t->bt_pinned, 0);
      t->bt_pinned = NULL;
   }

   /* Get currently doesn't take any flags. */
   if (flags) {
      errno = EINVAL;
      return (RET_ERROR);
   }

   if ((e = __bt_search(t, key, &exact)) == NULL)
      return (RET_ERROR);
   if (!exact) {
      mpool_put(t->bt_mp, e->page, 0);
      return (RET_SPECIAL);
   }

   status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0);

   /*
    * If the user is doing concurrent access, we copied the
    * key/data, toss the page.
    */
   if (F_ISSET(t, B_DB_LOCK))
      mpool_put(t->bt_mp, e->page, 0);
   else
      t->bt_pinned = e->page;
   return (status);
}