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OpenZFS provides a library called tpool which implements thread pools for user space applications. Porting this library means the zpool utility no longer needs to borrow the kernel mutex and taskq interfaces from libzpool. This code was updated to use the tpool library which behaves in a very similar fashion. Porting libtpool was relatively straight forward and minimal modifications were needed. The core changes were: * Fully convert the library to use pthreads. * Updated signal handling. * lmalloc/lfree converted to calloc/free * Implemented portable pthread_attr_clone() function. Finally, update the build system such that libzpool.so is no longer linked in to zfs(8), zpool(8), etc. All that is required is libzfs to which the zcommon soures were added (which is the way it always should have been). Removing the libzpool dependency resulted in several build issues which needed to be resolved. * Moved zfeature support to module/zcommon/zfeature_common.c * Moved ratelimiting to to module/zfs/zfs_ratelimit.c * Moved get_system_hostid() to lib/libspl/gethostid.c * Removed use of cmn_err() in zcommon source * Removed dprintf_setup() call from zpool_main.c and zfs_main.c * Removed highbit() and lowbit() * Removed unnecessary library dependencies from Makefiles * Removed fletcher-4 kstat in user space * Added sha2 support explicitly to libzfs * Added highbit64() and lowbit64() to zpool_util.c Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #6442
94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _THREAD_POOL_IMPL_H
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#define _THREAD_POOL_IMPL_H
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#include <thread_pool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Thread pool implementation definitions.
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* See <thread_pool.h> for interface declarations.
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*/
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/*
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* FIFO queued job
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*/
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typedef struct tpool_job tpool_job_t;
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struct tpool_job {
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tpool_job_t *tpj_next; /* list of jobs */
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void (*tpj_func)(void *); /* function to call */
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void *tpj_arg; /* its argument */
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};
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/*
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* List of active threads, linked through their stacks.
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*/
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typedef struct tpool_active tpool_active_t;
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struct tpool_active {
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tpool_active_t *tpa_next; /* list of active threads */
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pthread_t tpa_tid; /* active thread id */
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};
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/*
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* The thread pool.
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*/
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struct tpool {
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tpool_t *tp_forw; /* circular list of all thread pools */
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tpool_t *tp_back;
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pthread_mutex_t tp_mutex; /* protects the pool data */
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pthread_cond_t tp_busycv; /* synchronization in tpool_dispatch */
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pthread_cond_t tp_workcv; /* synchronization with workers */
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pthread_cond_t tp_waitcv; /* synchronization in tpool_wait() */
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tpool_active_t *tp_active; /* threads performing work */
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tpool_job_t *tp_head; /* FIFO job queue */
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tpool_job_t *tp_tail;
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pthread_attr_t tp_attr; /* attributes of the workers */
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int tp_flags; /* see below */
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uint_t tp_linger; /* seconds before idle workers exit */
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int tp_njobs; /* number of jobs in job queue */
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int tp_minimum; /* minimum number of worker threads */
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int tp_maximum; /* maximum number of worker threads */
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int tp_current; /* current number of worker threads */
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int tp_idle; /* number of idle workers */
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};
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/* tp_flags */
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#define TP_WAIT 0x01 /* waiting in tpool_wait() */
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#define TP_SUSPEND 0x02 /* pool is being suspended */
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#define TP_DESTROY 0x04 /* pool is being destroyed */
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#define TP_ABANDON 0x08 /* pool is abandoned (auto-destroy) */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _THREAD_POOL_IMPL_H */
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