projects / mirror_zfs.git / blame
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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 | /* | |
| 23 | * Copyright 2008 Sun Microsystems, Inc. All rights reserved. | |
| 24 | * Use is subject to license terms. | |
| 25 | */ | |
| 26 | ||
| 27 | #ifndef _THREAD_POOL_IMPL_H | |
| 28 | #define _THREAD_POOL_IMPL_H | |
| 29 | ||
| 30 | #include <thread_pool.h> | |
| 31 | ||
| 32 | #ifdef __cplusplus | |
| 33 | extern "C" { | |
| 34 | #endif | |
| 35 | ||
| 36 | /* | |
| 37 | * Thread pool implementation definitions. | |
| 38 | * See <thread_pool.h> for interface declarations. | |
| 39 | */ | |
| 40 | ||
| 41 | /* | |
| 42 | * FIFO queued job | |
| 43 | */ | |
| 44 | typedef struct tpool_job tpool_job_t; | |
| 45 | struct tpool_job { | |
| 46 | tpool_job_t *tpj_next; /* list of jobs */ | |
| 47 | void (*tpj_func)(void *); /* function to call */ | |
| 48 | void *tpj_arg; /* its argument */ | |
| 49 | }; | |
| 50 | ||
| 51 | /* | |
| 52 | * List of active threads, linked through their stacks. | |
| 53 | */ | |
| 54 | typedef struct tpool_active tpool_active_t; | |
| 55 | struct tpool_active { | |
| 56 | tpool_active_t *tpa_next; /* list of active threads */ | |
| 57 | pthread_t tpa_tid; /* active thread id */ | |
| 58 | }; | |
| 59 | ||
| 60 | /* | |
| 61 | * The thread pool. | |
| 62 | */ | |
| 63 | struct tpool { | |
| 64 | tpool_t *tp_forw; /* circular list of all thread pools */ | |
| 65 | tpool_t *tp_back; | |
| 66 | pthread_mutex_t tp_mutex; /* protects the pool data */ | |
| 67 | pthread_cond_t tp_busycv; /* synchronization in tpool_dispatch */ | |
| 68 | pthread_cond_t tp_workcv; /* synchronization with workers */ | |
| 69 | pthread_cond_t tp_waitcv; /* synchronization in tpool_wait() */ | |
| 70 | tpool_active_t *tp_active; /* threads performing work */ | |
| 71 | tpool_job_t *tp_head; /* FIFO job queue */ | |
| 72 | tpool_job_t *tp_tail; | |
| 73 | pthread_attr_t tp_attr; /* attributes of the workers */ | |
| 74 | int tp_flags; /* see below */ | |
| 75 | uint_t tp_linger; /* seconds before idle workers exit */ | |
| 76 | int tp_njobs; /* number of jobs in job queue */ | |
| 77 | int tp_minimum; /* minimum number of worker threads */ | |
| 78 | int tp_maximum; /* maximum number of worker threads */ | |
| 79 | int tp_current; /* current number of worker threads */ | |
| 80 | int tp_idle; /* number of idle workers */ | |
| 81 | }; | |
| 82 | ||
| 83 | /* tp_flags */ | |
| 84 | #define TP_WAIT 0x01 /* waiting in tpool_wait() */ | |
| 85 | #define TP_SUSPEND 0x02 /* pool is being suspended */ | |
| 86 | #define TP_DESTROY 0x04 /* pool is being destroyed */ | |
| 87 | #define TP_ABANDON 0x08 /* pool is abandoned (auto-destroy) */ | |
| 88 | ||
| 89 | #ifdef __cplusplus | |
| 90 | } | |
| 91 | #endif | |
| 92 | ||
| 93 | #endif /* _THREAD_POOL_IMPL_H */ |