diff options
Diffstat (limited to 'src/core/lib/support/sync_windows.cc')
-rw-r--r-- | src/core/lib/support/sync_windows.cc | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/src/core/lib/support/sync_windows.cc b/src/core/lib/support/sync_windows.cc new file mode 100644 index 0000000000..008c5aecba --- /dev/null +++ b/src/core/lib/support/sync_windows.cc @@ -0,0 +1,118 @@ +/* + * + * 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 */ |