Initial revision

CVS patchset: 5630
CVS date: 2002/08/14 16:31:49

1 files changed, 75 insertions, 0 deletions

diff --git a/db/examples_c/ex_apprec/ex_apprec_template b/db/examples_c/ex_apprec/ex_apprec_template
new file mode 100644
index 000000000..e67ccb6d8
--- /dev/null
+++ b/db/examples_c/ex_apprec/ex_apprec_template
@@ -0,0 +1,75 @@
+#include "db_config.h"
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#include <string.h>
+#endif
+
+#include "db_int.h"
+#include "dbinc/db_page.h"
+#include "dbinc/ex_apprec.h"
+#include "dbinc/log.h"
+
+/*
+ * ex_apprec_mkdir_recover --
+ *	Recovery function for mkdir.
+ *
+ * PUBLIC: int ex_apprec_mkdir_recover
+ * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
+ */
+int
+ex_apprec_mkdir_recover(dbenv, dbtp, lsnp, op, info)
+	DB_ENV *dbenv;
+	DBT *dbtp;
+	DB_LSN *lsnp;
+	db_recops op;
+	void *info;
+{
+	ex_apprec_mkdir_args *argp;
+	DB *file_dbp;
+	DBC *dbc;
+	DB_MPOOLFILE *mpf;
+	PAGE *pagep;
+	int cmp_n, cmp_p, modified, ret;
+
+	REC_PRINT(ex_apprec_mkdir_print);
+	REC_INTRO(ex_apprec_mkdir_read, 1);
+
+	if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0)
+		if (DB_REDO(op)) {
+			if ((ret = mpf->get(mpf,
+			    &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
+				goto out;
+		} else {
+			*lsnp = argp->prev_lsn;
+			ret = 0;
+			goto out;
+		}
+
+	modified = 0;
+	cmp_n = log_compare(lsnp, &LSN(pagep));
+
+	/*
+	 * Use this when there is something like "pagelsn" in the argp
+	 * structure.  Sometimes, you might need to compare meta-data
+	 * lsn's instead.
+	 *
+	 * cmp_p = log_compare(&LSN(pagep), argp->pagelsn);
+	 */
+	if (cmp_p == 0 && DB_REDO(op)) {
+		/* Need to redo update described. */
+		modified = 1;
+	} else if (cmp_n == 0 && !DB_REDO(op)) {
+		/* Need to undo update described. */
+		modified = 1;
+	}
+	if (ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0))
+		goto out;
+
+	*lsnp = argp->prev_lsn;
+	ret = 0;
+
+out:	REC_CLOSE;
+}
+