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1 /* Copyright (c) 2013,2015 The Linux Foundation. All rights reserved.
2  *
3  * Redistribution and use in source and binary forms, with or without
4  * modification, are permitted provided that the following conditions are
5  * met:
6  *     * Redistributions of source code must retain the above copyright
7  *       notice, this list of conditions and the following disclaimer.
8  *     * Redistributions in binary form must reproduce the above
9  *       copyright notice, this list of conditions and the following
10  *       disclaimer in the documentation and/or other materials provided
11  *       with the distribution.
12  *     * Neither the name of The Linux Foundation, nor the names of its
13  *       contributors may be used to endorse or promote products derived
14  *       from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
23  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
25  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
26  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  */
29 
30 #ifndef __LOC_DELAY_H__
31 #define __LOC_DELAY_H__
32 
33 #ifdef __cplusplus
34 extern "C" {
35 #endif /* __cplusplus */
36 #include <stddef.h>
37 
38 /*
39     user_data: client context pointer, passthrough. Originally received
40                from calling client when loc_timer_start() is called.
41     result:    0 if timer successfully timed out; else timer failed.
42 */
43 typedef void (*loc_timer_callback)(void *user_data, int32_t result);
44 
45 
46 /*
47     delay_msec:         timeout value for the timer.
48     cb_func:            callback function pointer, implemented by client.
49                         Can not be NULL.
50     user_data:          client context pointer, passthrough.  Will be
51                         returned when loc_timer_callback() is called.
52     wakeOnExpire:       true if to wake up CPU (if sleeping) upon timer
53                                 expiration and notify the client.
54                         false if to wait until next time CPU wakes up (if
55                                  sleeping) and then notify the client.
56     Returns the handle, which can be used to stop the timer
57                         NULL, if timer start fails (e.g. if cb_func is NULL).
58 */
59 void* loc_timer_start(uint64_t delay_msec,
60                       loc_timer_callback cb_func,
61                       void *user_data,
62                       bool wake_on_expire=false);
63 
64 /*
65     handle becomes invalid upon the return of the callback
66 */
67 void loc_timer_stop(void*& handle);
68 
69 #ifdef __cplusplus
70 }
71 #endif /* __cplusplus */
72 
73 #endif //__LOC_DELAY_H__
74