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46e8e0cd7e
Same concept as dbwrap_watched_watch_send/recv: Get informed if the underlying data of a record changes. This utilizes the watched database that g_lock is based upon anyway. To avoid spurious wakeups by pure g_lock operations this patch adds a sequence number for the data that is stored in the g_lock data field. Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/*
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Unix SMB/CIFS implementation.
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global locks based on dbwrap and messaging
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Copyright (C) 2009 by Volker Lendecke
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _G_LOCK_H_
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#define _G_LOCK_H_
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#include "dbwrap/dbwrap.h"
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struct g_lock_ctx;
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struct messaging_context;
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enum g_lock_type {
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G_LOCK_READ,
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G_LOCK_WRITE,
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G_LOCK_UPGRADE,
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G_LOCK_DOWNGRADE,
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};
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struct g_lock_ctx *g_lock_ctx_init_backend(
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TALLOC_CTX *mem_ctx,
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struct messaging_context *msg,
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struct db_context **backend);
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struct g_lock_ctx *g_lock_ctx_init(TALLOC_CTX *mem_ctx,
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struct messaging_context *msg);
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struct tevent_req *g_lock_lock_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct g_lock_ctx *ctx,
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TDB_DATA key,
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enum g_lock_type type);
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NTSTATUS g_lock_lock_recv(struct tevent_req *req);
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NTSTATUS g_lock_lock(struct g_lock_ctx *ctx, TDB_DATA key,
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enum g_lock_type lock_type, struct timeval timeout);
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NTSTATUS g_lock_unlock(struct g_lock_ctx *ctx, TDB_DATA key);
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NTSTATUS g_lock_write_data(struct g_lock_ctx *ctx, TDB_DATA key,
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const uint8_t *buf, size_t buflen);
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int g_lock_locks(struct g_lock_ctx *ctx,
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int (*fn)(TDB_DATA key, void *private_data),
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void *private_data);
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NTSTATUS g_lock_dump(struct g_lock_ctx *ctx,
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TDB_DATA key,
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void (*fn)(struct server_id exclusive,
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size_t num_shared,
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struct server_id *shared,
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const uint8_t *data,
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size_t datalen,
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void *private_data),
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void *private_data);
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struct tevent_req *g_lock_watch_data_send(
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TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct g_lock_ctx *ctx,
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TDB_DATA key,
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struct server_id blocker);
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NTSTATUS g_lock_watch_data_recv(
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struct tevent_req *req,
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bool *blockerdead,
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struct server_id *blocker);
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#endif
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