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 = 0,
  30         G_LOCK_WRITE = 1,
  31 };
  32
  33 struct g_lock_rec {
  34         enum g_lock_type lock_type;
  35         struct server_id pid;
  36 };
  37
  38 struct g_lock_ctx *g_lock_ctx_init(TALLOC_CTX *mem_ctx,
  39                                    struct messaging_context *msg);
  40
  41 struct tevent_req *g_lock_lock_send(TALLOC_CTX *mem_ctx,
  42                                     struct tevent_context *ev,
  43                                     struct g_lock_ctx *ctx,
  44                                     TDB_DATA key,
  45                                     enum g_lock_type type);
  46 NTSTATUS g_lock_lock_recv(struct tevent_req *req);
  47 NTSTATUS g_lock_lock(struct g_lock_ctx *ctx, TDB_DATA key,
  48                      enum g_lock_type lock_type, struct timeval timeout);
  49 NTSTATUS g_lock_unlock(struct g_lock_ctx *ctx, TDB_DATA key);
  50
  51 NTSTATUS g_lock_write_data(struct g_lock_ctx *ctx, TDB_DATA key,
  52                            const uint8_t *buf, size_t buflen);
  53
  54 NTSTATUS g_lock_do(TDB_DATA key, enum g_lock_type lock_type,
  55                    struct timeval timeout,
  56                    void (*fn)(void *private_data), void *private_data);
  57
  58 int g_lock_locks(struct g_lock_ctx *ctx,
  59                  int (*fn)(TDB_DATA key, void *private_data),
  60                  void *private_data);
  61 NTSTATUS g_lock_dump(struct g_lock_ctx *ctx, TDB_DATA key,
  62                      void (*fn)(const struct g_lock_rec *locks,
  63                                 size_t num_locks,
  64                                 const uint8_t *data,
  65                                 size_t datalen,
  66                                 void *private_data),
  67                      void *private_data);
  68
  69 #endif