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/*
*
* 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_WIN32
#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) == 0) {
SleepConditionVariableCS(cv, &mu->cs, INFINITE);
} else {
gpr_timespec now = gpr_now();
gpr_int64 now_ms = now.tv_sec * 1000 + now.tv_nsec / 1000000;
gpr_int64 deadline_ms =
abs_deadline.tv_sec * 1000 + abs_deadline.tv_nsec / 1000000;
if (now_ms >= deadline_ms) {
timeout = 1;
} else {
timeout_max_ms = (DWORD)min(deadline_ms - now_ms, INFINITE - 1);
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_WIN32 */
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