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#ifndef AWS_COMMON_CLOCK_H
#define AWS_COMMON_CLOCK_H
/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/common/common.h>
#include <aws/common/math.h>
AWS_PUSH_SANE_WARNING_LEVEL
enum aws_timestamp_unit {
AWS_TIMESTAMP_SECS = 1,
AWS_TIMESTAMP_MILLIS = 1000,
AWS_TIMESTAMP_MICROS = 1000000,
AWS_TIMESTAMP_NANOS = 1000000000,
};
AWS_EXTERN_C_BEGIN
/**
* Converts 'timestamp' from unit 'convert_from' to unit 'convert_to', if the units are the same then 'timestamp' is
* returned. If 'remainder' is NOT NULL, it will be set to the remainder if convert_from is a more precise unit than
* convert_to. To avoid unnecessary branching, 'remainder' is not zero initialized in this function, be sure to set it
* to 0 first if you care about that kind of thing. If conversion would lead to integer overflow, the timestamp
* returned will be the highest possible time that is representable, i.e. UINT64_MAX.
*/
AWS_STATIC_IMPL uint64_t aws_timestamp_convert(
uint64_t timestamp,
enum aws_timestamp_unit convert_from,
enum aws_timestamp_unit convert_to,
uint64_t *remainder);
/**
* More general form of aws_timestamp_convert that takes arbitrary frequencies rather than the timestamp enum.
*/
AWS_STATIC_IMPL uint64_t
aws_timestamp_convert_u64(uint64_t ticks, uint64_t old_frequency, uint64_t new_frequency, uint64_t *remainder);
/**
* Get ticks in nanoseconds (usually 100 nanosecond precision) on the high resolution clock (most-likely TSC). This
* clock has no bearing on the actual system time. On success, timestamp will be set.
*/
AWS_COMMON_API
int aws_high_res_clock_get_ticks(uint64_t *timestamp);
/**
* Get ticks in nanoseconds (usually 100 nanosecond precision) on the system clock. Reflects actual system time via
* nanoseconds since unix epoch. Use with care since an inaccurately set clock will probably cause bugs. On success,
* timestamp will be set.
*/
AWS_COMMON_API
int aws_sys_clock_get_ticks(uint64_t *timestamp);
#ifndef AWS_NO_STATIC_IMPL
# include <aws/common/clock.inl>
#endif /* AWS_NO_STATIC_IMPL */
AWS_EXTERN_C_END
AWS_POP_SANE_WARNING_LEVEL
#endif /* AWS_COMMON_CLOCK_H */
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