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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #ifndef _SYS_TXG_IMPL_H
     27 #define	_SYS_TXG_IMPL_H
     28 
     29 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     30 
     31 #include <sys/spa.h>
     32 #include <sys/txg.h>
     33 
     34 #ifdef	__cplusplus
     35 extern "C" {
     36 #endif
     37 
     38 struct tx_cpu {
     39 	kmutex_t	tc_lock;
     40 	kcondvar_t	tc_cv[TXG_SIZE];
     41 	uint64_t	tc_count[TXG_SIZE];
     42 	char		tc_pad[16];
     43 };
     44 
     45 typedef struct tx_state {
     46 	tx_cpu_t	*tx_cpu;	/* protects right to enter txg	*/
     47 	kmutex_t	tx_sync_lock;	/* protects tx_state_t */
     48 	krwlock_t	tx_suspend;
     49 	uint64_t	tx_open_txg;	/* currently open txg id */
     50 	uint64_t	tx_quiesced_txg; /* quiesced txg waiting for sync */
     51 	uint64_t	tx_syncing_txg;	/* currently syncing txg id */
     52 	uint64_t	tx_synced_txg;	/* last synced txg id */
     53 
     54 	uint64_t	tx_sync_txg_waiting; /* txg we're waiting to sync */
     55 	uint64_t	tx_quiesce_txg_waiting; /* txg we're waiting to open */
     56 
     57 	kcondvar_t	tx_sync_more_cv;
     58 	kcondvar_t	tx_sync_done_cv;
     59 	kcondvar_t	tx_quiesce_more_cv;
     60 	kcondvar_t	tx_quiesce_done_cv;
     61 	kcondvar_t	tx_timeout_cv;
     62 	kcondvar_t	tx_exit_cv;	/* wait for all threads to exit */
     63 
     64 	uint8_t		tx_threads;	/* number of threads */
     65 	uint8_t		tx_exiting;	/* set when we're exiting */
     66 
     67 	kthread_t	*tx_sync_thread;
     68 	kthread_t	*tx_quiesce_thread;
     69 	kthread_t	*tx_timelimit_thread;
     70 } tx_state_t;
     71 
     72 #ifdef	__cplusplus
     73 }
     74 #endif
     75 
     76 #endif	/* _SYS_TXG_IMPL_H */
     77