1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/* Win32 code for gpr synchronization support. */
#include <grpc/support/port_platform.h>
#ifdef GPR_WINDOWS
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/time.h>
void gpr_mu_init(gpr_mu *mu) {
InitializeCriticalSection(&mu->cs);
mu->locked = 0;
}
void gpr_mu_destroy(gpr_mu *mu) { DeleteCriticalSection(&mu->cs); }
void gpr_mu_lock(gpr_mu *mu) {
EnterCriticalSection(&mu->cs);
GPR_ASSERT(!mu->locked);
mu->locked = 1;
}
void gpr_mu_unlock(gpr_mu *mu) {
mu->locked = 0;
LeaveCriticalSection(&mu->cs);
}
int gpr_mu_trylock(gpr_mu *mu) {
int result = TryEnterCriticalSection(&mu->cs);
if (result) {
if (mu->locked) { /* This thread already holds the lock. */
LeaveCriticalSection(&mu->cs); /* Decrement lock count. */
result = 0; /* Indicate failure */
}
mu->locked = 1;
}
return result;
}
/*----------------------------------------*/
void gpr_cv_init(gpr_cv *cv) { InitializeConditionVariable(cv); }
void gpr_cv_destroy(gpr_cv *cv) {
/* Condition variables don't need destruction in Win32. */
}
int gpr_cv_wait(gpr_cv *cv, gpr_mu *mu, gpr_timespec abs_deadline) {
int timeout = 0;
DWORD timeout_max_ms;
mu->locked = 0;
if (gpr_time_cmp(abs_deadline, gpr_inf_future(abs_deadline.clock_type)) ==
0) {
SleepConditionVariableCS(cv, &mu->cs, INFINITE);
} else {
abs_deadline = gpr_convert_clock_type(abs_deadline, GPR_CLOCK_REALTIME);
gpr_timespec now = gpr_now(abs_deadline.clock_type);
int64_t now_ms = (int64_t)now.tv_sec * 1000 + now.tv_nsec / 1000000;
int64_t deadline_ms =
(int64_t)abs_deadline.tv_sec * 1000 + abs_deadline.tv_nsec / 1000000;
if (now_ms >= deadline_ms) {
timeout = 1;
} else {
if ((deadline_ms - now_ms) >= INFINITE) {
timeout_max_ms = INFINITE - 1;
} else {
timeout_max_ms = (DWORD)(deadline_ms - now_ms);
}
timeout = (SleepConditionVariableCS(cv, &mu->cs, timeout_max_ms) == 0 &&
GetLastError() == ERROR_TIMEOUT);
}
}
mu->locked = 1;
return timeout;
}
void gpr_cv_signal(gpr_cv *cv) { WakeConditionVariable(cv); }
void gpr_cv_broadcast(gpr_cv *cv) { WakeAllConditionVariable(cv); }
/*----------------------------------------*/
static void *dummy;
struct run_once_func_arg {
void (*init_function)(void);
};
static BOOL CALLBACK run_once_func(gpr_once *once, void *v, void **pv) {
struct run_once_func_arg *arg = v;
(*arg->init_function)();
return 1;
}
void gpr_once_init(gpr_once *once, void (*init_function)(void)) {
struct run_once_func_arg arg;
arg.init_function = init_function;
InitOnceExecuteOnce(once, run_once_func, &arg, &dummy);
}
#endif /* GPR_WINDOWS */
|
