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
|
/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/* 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 */
|
