source3/include/g_lock.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3    global locks based on dbwrap and messaging
   4    Copyright (C) 2009 by Volker Lendecke
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #ifndef _G_LOCK_H_
  21 #define _G_LOCK_H_
  22
  23 #include "dbwrap/dbwrap.h"
  24
  25 struct g_lock_ctx;
  26 struct messaging_context;
  27
  28 enum g_lock_type {
  29         G_LOCK_READ,
  30         G_LOCK_WRITE,
  31         G_LOCK_UPGRADE,
  32         G_LOCK_DOWNGRADE,
  33 };
  34
  35 struct g_lock_ctx *g_lock_ctx_init_backend(
  36         TALLOC_CTX *mem_ctx,
  37         struct messaging_context *msg,
  38         struct db_context **backend);
  39 struct g_lock_ctx *g_lock_ctx_init(TALLOC_CTX *mem_ctx,
  40                                    struct messaging_context *msg);
  41
  42 struct tevent_req *g_lock_lock_send(TALLOC_CTX *mem_ctx,
  43                                     struct tevent_context *ev,
  44                                     struct g_lock_ctx *ctx,
  45                                     TDB_DATA key,
  46                                     enum g_lock_type type);
  47 NTSTATUS g_lock_lock_recv(struct tevent_req *req);
  48 NTSTATUS g_lock_lock(struct g_lock_ctx *ctx, TDB_DATA key,
  49                      enum g_lock_type lock_type, struct timeval timeout);
  50 NTSTATUS g_lock_unlock(struct g_lock_ctx *ctx, TDB_DATA key);
  51
  52 NTSTATUS g_lock_write_data(struct g_lock_ctx *ctx, TDB_DATA key,
  53                            const uint8_t *buf, size_t buflen);
  54
  55 int g_lock_locks(struct g_lock_ctx *ctx,
  56                  int (*fn)(TDB_DATA key, void *private_data),
  57                  void *private_data);
  58 NTSTATUS g_lock_dump(struct g_lock_ctx *ctx,
  59                      TDB_DATA key,
  60                      void (*fn)(struct server_id exclusive,
  61                                 size_t num_shared,
  62                                 struct server_id *shared,
  63                                 const uint8_t *data,
  64                                 size_t datalen,
  65                                 void *private_data),
  66                      void *private_data);
  67
  68 #endif