lib/libtpool/thread_pool_impl.h

   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 */