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1be6d849ab
This simplifies the g_lock implementation. The new implementation tries to acquire a lock. If that fails due to a lock conflict, wait for the g_lock record to change. Upon change, just try again. The old logic had to cope with pending records and an ugly hack into ctdb itself. As a bonus, we now get a really clean async g_lock_lock_send/recv that can asynchronously wait for a global lock. This would have been almost impossible to do without the dbwrap_record_watch infrastructure.
55 lines
1.7 KiB
C
55 lines
1.7 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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enum g_lock_type {
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G_LOCK_READ = 0,
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G_LOCK_WRITE = 1,
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};
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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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NTSTATUS g_lock_lock(struct g_lock_ctx *ctx, const char *name,
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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, const char *name);
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NTSTATUS g_lock_get(struct g_lock_ctx *ctx, const char *name,
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struct server_id *pid);
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NTSTATUS g_lock_do(const char *name, enum g_lock_type lock_type,
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struct timeval timeout,
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void (*fn)(void *private_data), void *private_data);
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int g_lock_locks(struct g_lock_ctx *ctx,
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int (*fn)(const char *name, void *private_data),
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void *private_data);
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NTSTATUS g_lock_dump(struct g_lock_ctx *ctx, const char *name,
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int (*fn)(struct server_id pid,
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enum g_lock_type lock_type,
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void *private_data),
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void *private_data);
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#endif
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