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[FreeBSD/releng/10.2.git] / contrib / ofed / management / opensm / complib / cl_event.c
1 /*
2  * Copyright (c) 2004, 2005 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 #if HAVE_CONFIG_H
37 #  include <config.h>
38 #endif                          /* HAVE_CONFIG_H */
39
40 #include <complib/cl_event.h>
41 #include <complib/cl_debug.h>
42 #include <sys/time.h>
43 #include <sys/errno.h>
44
45 void cl_event_construct(IN cl_event_t * p_event)
46 {
47         CL_ASSERT(p_event);
48
49         p_event->state = CL_UNINITIALIZED;
50 }
51
52 cl_status_t
53 cl_event_init(IN cl_event_t * const p_event, IN const boolean_t manual_reset)
54 {
55         CL_ASSERT(p_event);
56
57         cl_event_construct(p_event);
58
59         pthread_cond_init(&p_event->condvar, NULL);
60         pthread_mutex_init(&p_event->mutex, NULL);
61         p_event->signaled = FALSE;
62         p_event->manual_reset = manual_reset;
63         p_event->state = CL_INITIALIZED;
64
65         return (CL_SUCCESS);
66 }
67
68 void cl_event_destroy(IN cl_event_t * const p_event)
69 {
70         CL_ASSERT(cl_is_state_valid(p_event->state));
71
72         /* Destroy only if the event was constructed */
73         if (p_event->state == CL_INITIALIZED) {
74                 pthread_cond_broadcast(&p_event->condvar);
75                 pthread_cond_destroy(&p_event->condvar);
76                 pthread_mutex_destroy(&p_event->mutex);
77         }
78
79         p_event->state = CL_UNINITIALIZED;
80 }
81
82 cl_status_t cl_event_signal(IN cl_event_t * const p_event)
83 {
84         /* Make sure that the event was started */
85         CL_ASSERT(p_event->state == CL_INITIALIZED);
86
87         pthread_mutex_lock(&p_event->mutex);
88         p_event->signaled = TRUE;
89         /* Wake up one or all depending on whether the event is auto-resetting. */
90         if (p_event->manual_reset)
91                 pthread_cond_broadcast(&p_event->condvar);
92         else
93                 pthread_cond_signal(&p_event->condvar);
94
95         pthread_mutex_unlock(&p_event->mutex);
96
97         return (CL_SUCCESS);
98 }
99
100 cl_status_t cl_event_reset(IN cl_event_t * const p_event)
101 {
102         /* Make sure that the event was started */
103         CL_ASSERT(p_event->state == CL_INITIALIZED);
104
105         pthread_mutex_lock(&p_event->mutex);
106         p_event->signaled = FALSE;
107         pthread_mutex_unlock(&p_event->mutex);
108
109         return (CL_SUCCESS);
110 }
111
112 cl_status_t
113 cl_event_wait_on(IN cl_event_t * const p_event,
114                  IN const uint32_t wait_us, IN const boolean_t interruptible)
115 {
116         cl_status_t status;
117         int wait_ret;
118         struct timespec timeout;
119         struct timeval curtime;
120
121         /* Make sure that the event was Started */
122         CL_ASSERT(p_event->state == CL_INITIALIZED);
123
124         pthread_mutex_lock(&p_event->mutex);
125
126         /* Return immediately if the event is signalled. */
127         if (p_event->signaled) {
128                 if (!p_event->manual_reset)
129                         p_event->signaled = FALSE;
130
131                 pthread_mutex_unlock(&p_event->mutex);
132                 return (CL_SUCCESS);
133         }
134
135         /* If just testing the state, return CL_TIMEOUT. */
136         if (wait_us == 0) {
137                 pthread_mutex_unlock(&p_event->mutex);
138                 return (CL_TIMEOUT);
139         }
140
141         if (wait_us == EVENT_NO_TIMEOUT) {
142                 /* Wait for condition variable to be signaled or broadcast. */
143                 if (pthread_cond_wait
144                     (&p_event->condvar, &p_event->mutex))
145                         status = CL_NOT_DONE;
146                 else
147                         status = CL_SUCCESS;
148         } else {
149                 /* Get the current time */
150                 if (gettimeofday(&curtime, NULL) == 0) {
151                         timeout.tv_sec = curtime.tv_sec + (wait_us / 1000000);
152                         timeout.tv_nsec =
153                             (curtime.tv_usec + (wait_us % 1000000)) * 1000;
154
155                         wait_ret = pthread_cond_timedwait(&p_event->condvar,
156                                                           &p_event->mutex,
157                                                           &timeout);
158                         if (wait_ret == 0)
159                                 status =
160                                     (p_event->
161                                      signaled ? CL_SUCCESS : CL_NOT_DONE);
162                         else if (wait_ret == ETIMEDOUT)
163                                 status = CL_TIMEOUT;
164                         else
165                                 status = CL_NOT_DONE;
166                 } else {
167                         status = CL_ERROR;
168                 }
169         }
170         if (!p_event->manual_reset)
171                 p_event->signaled = FALSE;
172
173         pthread_mutex_unlock(&p_event->mutex);
174         return (status);
175 }