1 /**************************************************************************
2 *
3 * Copyright 2008-2010 VMware, Inc.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 /**
29 * @file
30 * OS independent time-manipulation functions.
31 *
32 * @author Jose Fonseca <jfonseca@vmware.com>
33 */
34
35 #ifndef _OS_TIME_H_
36 #define _OS_TIME_H_
37
38
39 #include "pipe/p_config.h"
40
41 #if defined(PIPE_OS_UNIX)
42 # include <unistd.h> /* usleep */
43 #endif
44
45 #include "pipe/p_compiler.h"
46
47
48 #ifdef __cplusplus
49 extern "C" {
50 #endif
51
52
53 /*
54 * Get the current time in microseconds from an unknown base.
55 */
56 int64_t
57 os_time_get(void);
58
59
60 /*
61 * Sleep.
62 */
63 #if defined(PIPE_OS_UNIX)
64 #define os_time_sleep(_usecs) usleep(_usecs)
65 #else
66 void
67 os_time_sleep(int64_t usecs);
68 #endif
69
70
71 /*
72 * Helper function for detecting time outs, taking in account overflow.
73 *
74 * Returns true if the current time has elapsed beyond the specified interval.
75 */
76 static INLINE boolean
os_time_timeout(int64_t start,int64_t end,int64_t curr)77 os_time_timeout(int64_t start,
78 int64_t end,
79 int64_t curr)
80 {
81 if(start <= end)
82 return !(start <= curr && curr < end);
83 else
84 return !((start <= curr) || (curr < end));
85 }
86
87
88 #ifdef __cplusplus
89 }
90 #endif
91
92 #endif /* _OS_TIME_H_ */
93