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
45void cl_event_construct(IN cl_event_t * p_event)
46{
47	CL_ASSERT(p_event);
48
49	p_event->state = CL_UNINITIALIZED;
50}
51
52cl_status_t
53cl_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
68void 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
82cl_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
100cl_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
112cl_status_t
113cl_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}
176