| /* |
| * |
| * 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 = (struct run_once_func_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 */ |