1 /*
2 Copyright (c) 2011-2016 mingw-w64 project
3
4 Permission is hereby granted, free of charge, to any person obtaining a
5 copy of this software and associated documentation files (the "Software"),
6 to deal in the Software without restriction, including without limitation
7 the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 and/or sell copies of the Software, and to permit persons to whom the
9 Software is furnished to do so, subject to the following conditions:
10
11 The above copyright notice and this permission notice shall be included in
12 all copies or substantial portions of the Software.
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20 DEALINGS IN THE SOFTWARE.
21 */
22
23 #include "pthread.h"
24 #include "windows.h"
25 #include "misc.h"
26
_pthread_time_in_ms(void)27 unsigned long long _pthread_time_in_ms(void)
28 {
29 FILETIME ft;
30
31 GetSystemTimeAsFileTime(&ft);
32 return (((unsigned long long)ft.dwHighDateTime << 32) + ft.dwLowDateTime
33 - 0x19DB1DED53E8000ULL) / 10000ULL;
34 }
35
_pthread_time_in_ms_from_timespec(const struct timespec * ts)36 unsigned long long _pthread_time_in_ms_from_timespec(const struct timespec *ts)
37 {
38 unsigned long long t = (unsigned long long) ts->tv_sec * 1000LL;
39 /* The +999999 is here to ensure that the division always rounds up */
40 t += (unsigned long long) (ts->tv_nsec + 999999) / 1000000;
41
42 return t;
43 }
44
_pthread_rel_time_in_ms(const struct timespec * ts)45 unsigned long long _pthread_rel_time_in_ms(const struct timespec *ts)
46 {
47 unsigned long long t1 = _pthread_time_in_ms_from_timespec(ts);
48 unsigned long long t2 = _pthread_time_in_ms();
49
50 /* Prevent underflow */
51 if (t1 < t2) return 0;
52 return t1 - t2;
53 }
54
55 static unsigned long long
_pthread_get_tick_count(long long * frequency)56 _pthread_get_tick_count (long long *frequency)
57 {
58 #if defined (_WIN32_WINNT) && (_WIN32_WINNT >= _WIN32_WINNT_VISTA)
59 (void) frequency; /* unused */
60 return GetTickCount64 ();
61 #else
62 LARGE_INTEGER freq, timestamp;
63
64 if (*frequency == 0)
65 {
66 if (QueryPerformanceFrequency (&freq))
67 *frequency = freq.QuadPart;
68 else
69 *frequency = -1;
70 }
71
72 if (*frequency > 0 && QueryPerformanceCounter (×tamp))
73 return timestamp.QuadPart / (*frequency / 1000);
74
75 /* Fallback */
76 return GetTickCount ();
77 #endif
78 }
79
80 /* A wrapper around WaitForSingleObject() that ensures that
81 * the wait function does not time out before the time
82 * actually runs out. This is needed because WaitForSingleObject()
83 * might have poor accuracy, returning earlier than expected.
84 * On the other hand, returning a bit *later* than expected
85 * is acceptable in a preemptive multitasking environment.
86 */
87 unsigned long
_pthread_wait_for_single_object(void * handle,unsigned long timeout)88 _pthread_wait_for_single_object (void *handle, unsigned long timeout)
89 {
90 DWORD result;
91 unsigned long long start_time, end_time;
92 unsigned long wait_time;
93 long long frequency = 0;
94
95 if (timeout == INFINITE || timeout == 0)
96 return WaitForSingleObject ((HANDLE) handle, (DWORD) timeout);
97
98 start_time = _pthread_get_tick_count (&frequency);
99 end_time = start_time + timeout;
100 wait_time = timeout;
101
102 do
103 {
104 unsigned long long current_time;
105
106 result = WaitForSingleObject ((HANDLE) handle, (DWORD) wait_time);
107 if (result != WAIT_TIMEOUT)
108 break;
109
110 current_time = _pthread_get_tick_count (&frequency);
111 if (current_time >= end_time)
112 break;
113
114 wait_time = (DWORD) (end_time - current_time);
115 } while (TRUE);
116
117 return result;
118 }
119
120 /* A wrapper around WaitForMultipleObjects() that ensures that
121 * the wait function does not time out before the time
122 * actually runs out. This is needed because WaitForMultipleObjects()
123 * might have poor accuracy, returning earlier than expected.
124 * On the other hand, returning a bit *later* than expected
125 * is acceptable in a preemptive multitasking environment.
126 */
127 unsigned long
_pthread_wait_for_multiple_objects(unsigned long count,void ** handles,unsigned int all,unsigned long timeout)128 _pthread_wait_for_multiple_objects (unsigned long count, void **handles, unsigned int all, unsigned long timeout)
129 {
130 DWORD result;
131 unsigned long long start_time, end_time;
132 unsigned long wait_time;
133 long long frequency = 0;
134
135 if (timeout == INFINITE || timeout == 0)
136 return WaitForMultipleObjects ((DWORD) count, (HANDLE *) handles, all, (DWORD) timeout);
137
138 start_time = _pthread_get_tick_count (&frequency);
139 end_time = start_time + timeout;
140 wait_time = timeout;
141
142 do
143 {
144 unsigned long long current_time;
145
146 result = WaitForMultipleObjects ((DWORD) count, (HANDLE *) handles, all, (DWORD) wait_time);
147 if (result != WAIT_TIMEOUT)
148 break;
149
150 current_time = _pthread_get_tick_count (&frequency);
151 if (current_time >= end_time)
152 break;
153
154 wait_time = (DWORD) (end_time - current_time);
155 } while (TRUE);
156
157 return result;
158 }
159