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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/common/clock.h>
#include <time.h>
static const uint64_t NS_PER_SEC = 1000000000;
#if defined(CLOCK_MONOTONIC_RAW)
# define HIGH_RES_CLOCK CLOCK_MONOTONIC_RAW
#else
# define HIGH_RES_CLOCK CLOCK_MONOTONIC
#endif
/* This entire compilation branch has two goals. First, prior to OSX Sierra, clock_gettime does not exist on OSX, so we
* already need to branch on that. Second, even if we compile on a newer OSX, which we will always do for bindings (e.g.
* python, dotnet, java etc...), we have to worry about the same lib being loaded on an older version, and thus, we'd
* get linker errors at runtime. To avoid this, we do a dynamic load
* to keep the function out of linker tables and only use the symbol if the current running process has access to the
* function. */
#if defined(__MACH__)
# include <AvailabilityMacros.h>
# include <aws/common/thread.h>
# include <dlfcn.h>
# include <sys/time.h>
static int s_legacy_get_time(uint64_t *timestamp) {
struct timeval tv;
int ret_val = gettimeofday(&tv, NULL);
if (ret_val) {
return aws_raise_error(AWS_ERROR_CLOCK_FAILURE);
}
uint64_t secs = (uint64_t)tv.tv_sec;
uint64_t u_secs = (uint64_t)tv.tv_usec;
*timestamp = (secs * NS_PER_SEC) + (u_secs * 1000);
return AWS_OP_SUCCESS;
}
# if MAC_OS_X_VERSION_MAX_ALLOWED >= 101200
static aws_thread_once s_thread_once_flag = AWS_THREAD_ONCE_STATIC_INIT;
static int (*s_gettime_fn)(clockid_t clock_id, struct timespec *tp) = NULL;
static void s_do_osx_loads(void *user_data) {
(void)user_data;
s_gettime_fn = (int (*)(clockid_t clock_id, struct timespec * tp)) dlsym(RTLD_DEFAULT, "clock_gettime");
}
int aws_high_res_clock_get_ticks(uint64_t *timestamp) {
aws_thread_call_once(&s_thread_once_flag, s_do_osx_loads, NULL);
int ret_val = 0;
if (s_gettime_fn) {
struct timespec ts;
ret_val = s_gettime_fn(HIGH_RES_CLOCK, &ts);
if (ret_val) {
return aws_raise_error(AWS_ERROR_CLOCK_FAILURE);
}
uint64_t secs = (uint64_t)ts.tv_sec;
uint64_t n_secs = (uint64_t)ts.tv_nsec;
*timestamp = (secs * NS_PER_SEC) + n_secs;
return AWS_OP_SUCCESS;
}
return s_legacy_get_time(timestamp);
}
int aws_sys_clock_get_ticks(uint64_t *timestamp) {
aws_thread_call_once(&s_thread_once_flag, s_do_osx_loads, NULL);
int ret_val = 0;
if (s_gettime_fn) {
struct timespec ts;
ret_val = s_gettime_fn(CLOCK_REALTIME, &ts);
if (ret_val) {
return aws_raise_error(AWS_ERROR_CLOCK_FAILURE);
}
uint64_t secs = (uint64_t)ts.tv_sec;
uint64_t n_secs = (uint64_t)ts.tv_nsec;
*timestamp = (secs * NS_PER_SEC) + n_secs;
return AWS_OP_SUCCESS;
}
return s_legacy_get_time(timestamp);
}
# else
int aws_high_res_clock_get_ticks(uint64_t *timestamp) {
return s_legacy_get_time(timestamp);
}
int aws_sys_clock_get_ticks(uint64_t *timestamp) {
return s_legacy_get_time(timestamp);
}
# endif /* MAC_OS_X_VERSION_MAX_ALLOWED >= 101200 */
/* Everywhere else, just link clock_gettime in directly */
#else
int aws_high_res_clock_get_ticks(uint64_t *timestamp) {
int ret_val = 0;
struct timespec ts;
ret_val = clock_gettime(HIGH_RES_CLOCK, &ts);
if (ret_val) {
return aws_raise_error(AWS_ERROR_CLOCK_FAILURE);
}
uint64_t secs = (uint64_t)ts.tv_sec;
uint64_t n_secs = (uint64_t)ts.tv_nsec;
*timestamp = (secs * NS_PER_SEC) + n_secs;
return AWS_OP_SUCCESS;
}
int aws_sys_clock_get_ticks(uint64_t *timestamp) {
int ret_val = 0;
struct timespec ts;
ret_val = clock_gettime(CLOCK_REALTIME, &ts);
if (ret_val) {
return aws_raise_error(AWS_ERROR_CLOCK_FAILURE);
}
uint64_t secs = (uint64_t)ts.tv_sec;
uint64_t n_secs = (uint64_t)ts.tv_nsec;
*timestamp = (secs * NS_PER_SEC) + n_secs;
return AWS_OP_SUCCESS;
}
#endif /* defined(__MACH__) */
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