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[FreeBSD/releng/9.2.git] / contrib / ofed / management / opensm / complib / cl_threadpool.c
1 /*
2  * Copyright (c) 2004-2007 Voltaire, Inc. All rights reserved.
3  * Copyright (c) 2002-2005 Mellanox Technologies LTD. All rights reserved.
4  * Copyright (c) 1996-2003 Intel Corporation. All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  *
34  */
35
36 /*
37  * Abstract:
38  *      Implementation of thread pool.
39  *
40  */
41
42 #if HAVE_CONFIG_H
43 #  include <config.h>
44 #endif                          /* HAVE_CONFIG_H */
45
46 #include <stdlib.h>
47 #include <string.h>
48 #include <pthread.h>
49 #include <complib/cl_threadpool.h>
50
51 static void cleanup_mutex(void *arg)
52 {
53         pthread_mutex_unlock(&((cl_thread_pool_t *) arg)->mutex);
54 }
55
56 static void *thread_pool_routine(void *context)
57 {
58         cl_thread_pool_t *p_thread_pool = (cl_thread_pool_t *) context;
59
60         do {
61                 pthread_mutex_lock(&p_thread_pool->mutex);
62                 pthread_cleanup_push(cleanup_mutex, p_thread_pool);
63                 while (!p_thread_pool->events)
64                         pthread_cond_wait(&p_thread_pool->cond,
65                                           &p_thread_pool->mutex);
66                 p_thread_pool->events--;
67                 pthread_cleanup_pop(1);
68                 /* The event has been signalled.  Invoke the callback. */
69                 (*p_thread_pool->pfn_callback) (p_thread_pool->context);
70         } while (1);
71
72         return NULL;
73 }
74
75 cl_status_t
76 cl_thread_pool_init(IN cl_thread_pool_t * const p_thread_pool,
77                     IN unsigned count,
78                     IN void (*pfn_callback) (void *),
79                     IN void *context, IN const char *const name)
80 {
81         int i;
82
83         CL_ASSERT(p_thread_pool);
84         CL_ASSERT(pfn_callback);
85
86         memset(p_thread_pool, 0, sizeof(*p_thread_pool));
87
88         if (!count)
89                 count = cl_proc_count();
90
91         pthread_mutex_init(&p_thread_pool->mutex, NULL);
92         pthread_cond_init(&p_thread_pool->cond, NULL);
93
94         p_thread_pool->events = 0;
95
96         p_thread_pool->pfn_callback = pfn_callback;
97         p_thread_pool->context = context;
98
99         p_thread_pool->tid = calloc(count, sizeof(*p_thread_pool->tid));
100         if (!p_thread_pool->tid) {
101                 cl_thread_pool_destroy(p_thread_pool);
102                 return CL_INSUFFICIENT_MEMORY;
103         }
104
105         p_thread_pool->running_count = count;
106
107         for (i = 0; i < count; i++) {
108                 if (pthread_create(&p_thread_pool->tid[i], NULL,
109                                    thread_pool_routine, p_thread_pool) < 0) {
110                         cl_thread_pool_destroy(p_thread_pool);
111                         return CL_INSUFFICIENT_RESOURCES;
112                 }
113         }
114
115         return (CL_SUCCESS);
116 }
117
118 void cl_thread_pool_destroy(IN cl_thread_pool_t * const p_thread_pool)
119 {
120         int i;
121
122         CL_ASSERT(p_thread_pool);
123
124         for (i = 0; i < p_thread_pool->running_count; i++)
125                 if (p_thread_pool->tid[i])
126                         pthread_cancel(p_thread_pool->tid[i]);
127
128         for (i = 0; i < p_thread_pool->running_count; i++)
129                 if (p_thread_pool->tid[i])
130                         pthread_join(p_thread_pool->tid[i], NULL);
131
132         p_thread_pool->running_count = 0;
133         pthread_cond_destroy(&p_thread_pool->cond);
134         pthread_mutex_destroy(&p_thread_pool->mutex);
135
136         p_thread_pool->events = 0;
137 }
138
139 cl_status_t cl_thread_pool_signal(IN cl_thread_pool_t * const p_thread_pool)
140 {
141         int ret;
142         CL_ASSERT(p_thread_pool);
143         pthread_mutex_lock(&p_thread_pool->mutex);
144         p_thread_pool->events++;
145         ret = pthread_cond_signal(&p_thread_pool->cond);
146         pthread_mutex_unlock(&p_thread_pool->mutex);
147         return ret;
148 }