1 /*
2 *
3 * Copyright 2015 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19 /* Win32 code for gpr synchronization support. */
20
21 #include <grpc/support/port_platform.h>
22
23 #if defined(GPR_WINDOWS) && !defined(GPR_ABSEIL_SYNC) && \
24 !defined(GPR_CUSTOM_SYNC)
25
26 #include <grpc/support/log.h>
27 #include <grpc/support/sync.h>
28 #include <grpc/support/time.h>
29
gpr_mu_init(gpr_mu * mu)30 void gpr_mu_init(gpr_mu* mu) {
31 InitializeCriticalSection(&mu->cs);
32 mu->locked = 0;
33 }
34
gpr_mu_destroy(gpr_mu * mu)35 void gpr_mu_destroy(gpr_mu* mu) { DeleteCriticalSection(&mu->cs); }
36
gpr_mu_lock(gpr_mu * mu)37 void gpr_mu_lock(gpr_mu* mu) {
38 EnterCriticalSection(&mu->cs);
39 GPR_ASSERT(!mu->locked);
40 mu->locked = 1;
41 }
42
gpr_mu_unlock(gpr_mu * mu)43 void gpr_mu_unlock(gpr_mu* mu) {
44 mu->locked = 0;
45 LeaveCriticalSection(&mu->cs);
46 }
47
gpr_mu_trylock(gpr_mu * mu)48 int gpr_mu_trylock(gpr_mu* mu) {
49 int result = TryEnterCriticalSection(&mu->cs);
50 if (result) {
51 if (mu->locked) { /* This thread already holds the lock. */
52 LeaveCriticalSection(&mu->cs); /* Decrement lock count. */
53 result = 0; /* Indicate failure */
54 }
55 mu->locked = 1;
56 }
57 return result;
58 }
59
60 /*----------------------------------------*/
61
gpr_cv_init(gpr_cv * cv)62 void gpr_cv_init(gpr_cv* cv) { InitializeConditionVariable(cv); }
63
gpr_cv_destroy(gpr_cv * cv)64 void gpr_cv_destroy(gpr_cv* cv) {
65 /* Condition variables don't need destruction in Win32. */
66 }
67
gpr_cv_wait(gpr_cv * cv,gpr_mu * mu,gpr_timespec abs_deadline)68 int gpr_cv_wait(gpr_cv* cv, gpr_mu* mu, gpr_timespec abs_deadline) {
69 int timeout = 0;
70 DWORD timeout_max_ms;
71 mu->locked = 0;
72 if (gpr_time_cmp(abs_deadline, gpr_inf_future(abs_deadline.clock_type)) ==
73 0) {
74 SleepConditionVariableCS(cv, &mu->cs, INFINITE);
75 } else {
76 abs_deadline = gpr_convert_clock_type(abs_deadline, GPR_CLOCK_REALTIME);
77 gpr_timespec now = gpr_now(abs_deadline.clock_type);
78 int64_t now_ms = (int64_t)now.tv_sec * 1000 + now.tv_nsec / 1000000;
79 int64_t deadline_ms =
80 (int64_t)abs_deadline.tv_sec * 1000 + abs_deadline.tv_nsec / 1000000;
81 if (now_ms >= deadline_ms) {
82 timeout = 1;
83 } else {
84 if ((deadline_ms - now_ms) >= INFINITE) {
85 timeout_max_ms = INFINITE - 1;
86 } else {
87 timeout_max_ms = (DWORD)(deadline_ms - now_ms);
88 }
89 timeout = (SleepConditionVariableCS(cv, &mu->cs, timeout_max_ms) == 0 &&
90 GetLastError() == ERROR_TIMEOUT);
91 }
92 }
93 mu->locked = 1;
94 return timeout;
95 }
96
gpr_cv_signal(gpr_cv * cv)97 void gpr_cv_signal(gpr_cv* cv) { WakeConditionVariable(cv); }
98
gpr_cv_broadcast(gpr_cv * cv)99 void gpr_cv_broadcast(gpr_cv* cv) { WakeAllConditionVariable(cv); }
100
101 /*----------------------------------------*/
102
103 static void* phony;
104 struct run_once_func_arg {
105 void (*init_function)(void);
106 };
run_once_func(gpr_once * once,void * v,void ** pv)107 static BOOL CALLBACK run_once_func(gpr_once* once, void* v, void** pv) {
108 struct run_once_func_arg* arg = (struct run_once_func_arg*)v;
109 (*arg->init_function)();
110 return 1;
111 }
112
gpr_once_init(gpr_once * once,void (* init_function)(void))113 void gpr_once_init(gpr_once* once, void (*init_function)(void)) {
114 struct run_once_func_arg arg;
115 arg.init_function = init_function;
116 InitOnceExecuteOnce(once, run_once_func, &arg, &phony);
117 }
118
119 #endif /* defined(GPR_WINDOWS) && !defined(GPR_ABSEIL_SYNC) && \
120 !defined(GPR_CUSTOM_SYNC) */
121