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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/common/condition_variable.h>
#include <aws/common/clock.h>
#include <aws/common/mutex.h>
#include <windows.h>
#define AWSCV_TO_WINDOWS(pCV) (PCONDITION_VARIABLE) & (pCV)->condition_handle
int aws_condition_variable_init(struct aws_condition_variable *condition_variable) {
/* Ensure our condition variable and Windows' condition variables are the same size */
AWS_STATIC_ASSERT(sizeof(CONDITION_VARIABLE) == sizeof(condition_variable->condition_handle));
AWS_PRECONDITION(condition_variable);
InitializeConditionVariable(AWSCV_TO_WINDOWS(condition_variable));
condition_variable->initialized = true;
return AWS_OP_SUCCESS;
}
void aws_condition_variable_clean_up(struct aws_condition_variable *condition_variable) {
AWS_PRECONDITION(condition_variable);
AWS_ZERO_STRUCT(*condition_variable);
}
int aws_condition_variable_notify_one(struct aws_condition_variable *condition_variable) {
AWS_PRECONDITION(condition_variable && condition_variable->initialized);
WakeConditionVariable(AWSCV_TO_WINDOWS(condition_variable));
return AWS_OP_SUCCESS;
}
int aws_condition_variable_notify_all(struct aws_condition_variable *condition_variable) {
AWS_PRECONDITION(condition_variable && condition_variable->initialized);
WakeAllConditionVariable(AWSCV_TO_WINDOWS(condition_variable));
return AWS_OP_SUCCESS;
}
int aws_condition_variable_wait(struct aws_condition_variable *condition_variable, struct aws_mutex *mutex) {
AWS_PRECONDITION(condition_variable && condition_variable->initialized);
AWS_PRECONDITION(mutex && mutex->initialized);
if (SleepConditionVariableSRW(AWSCV_TO_WINDOWS(condition_variable), AWSMUTEX_TO_WINDOWS(mutex), INFINITE, 0)) {
return AWS_OP_SUCCESS;
}
return aws_raise_error(AWS_ERROR_COND_VARIABLE_ERROR_UNKNOWN);
}
int aws_condition_variable_wait_for(
struct aws_condition_variable *condition_variable,
struct aws_mutex *mutex,
int64_t time_to_wait) {
AWS_PRECONDITION(condition_variable && condition_variable->initialized);
AWS_PRECONDITION(mutex && mutex->initialized);
DWORD time_ms = (DWORD)aws_timestamp_convert(time_to_wait, AWS_TIMESTAMP_NANOS, AWS_TIMESTAMP_MILLIS, NULL);
if (SleepConditionVariableSRW(AWSCV_TO_WINDOWS(condition_variable), AWSMUTEX_TO_WINDOWS(mutex), time_ms, 0)) {
return AWS_OP_SUCCESS;
}
return aws_raise_error(AWS_ERROR_COND_VARIABLE_TIMED_OUT);
}
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