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Merge #19436

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19436: cpp11-compat: thread::sleep_for in microseconds r=benpicco a=kfessel

### Contribution description

after reviewing #19369  i found that there is a conversion to nanoseconds just to convert it to microseconds some instrunctions later for ztimer64_usec to handle it this removes one of the conversions (convert once direct to microseconds)

### Testing procedure

run the cpp tests

### Issues/PRs references

#19369

Co-authored-by: Karl Fessel <karl.fessel@ovgu.de>
This commit is contained in:
bors[bot] 2023-04-17 18:20:28 +00:00 committed by GitHub
commit 2b6dc6471e
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2 changed files with 17 additions and 14 deletions
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24
sys/cpp11-compat/include/riot/thread.hpp
View File

@ -172,9 +172,9 @@ inline thread_id get_id() noexcept { return thread_id{thread_getpid()}; }
inline void yield() noexcept { thread_yield(); }
/**
* @brief Puts the current thread to sleep.
* @param[in] ns Duration to sleep in nanoseconds.
* @param[in] us Duration to sleep in microseconds.
*/
void sleep_for(const std::chrono::nanoseconds& ns);
void sleep_for(const std::chrono::microseconds& us);
/**
* @brief Puts the current thread to sleep.
* @param[in] sleep_duration The duration to sleep.
@ -182,18 +182,22 @@ void sleep_for(const std::chrono::nanoseconds& ns);
template <class Rep, class Period>
void sleep_for(const std::chrono::duration<Rep, Period>& sleep_duration) {
using namespace std::chrono;
if (sleep_duration > std::chrono::duration<Rep, Period>::zero()) {
constexpr std::chrono::duration<long double> max = nanoseconds::max();
nanoseconds ns;
if (sleep_duration > sleep_duration.zero()) {
constexpr duration<long double> max = microseconds::max();
microseconds us;
if (sleep_duration < max) {
ns = duration_cast<nanoseconds>(sleep_duration);
if (ns < sleep_duration) {
++ns;
us = duration_cast<microseconds>(sleep_duration);
if (us.count() == 0) {
// wait at least 1
us = microseconds(1);
}
if (us < sleep_duration) {
++us;
}
} else {
ns = nanoseconds::max();
us = microseconds::max();
}
sleep_for(ns);
sleep_for(us);
}
}
/**

7
sys/cpp11-compat/thread.cpp
View File

@ -68,11 +68,10 @@ unsigned thread::hardware_concurrency() noexcept {
namespace this_thread {
void sleep_for(const chrono::nanoseconds& ns) {
void sleep_for(const chrono::microseconds& us) {
using namespace chrono;
if (ns > nanoseconds::zero()) {
ztimer64_sleep(ZTIMER64_USEC,
static_cast<uint64_t>(duration_cast<microseconds>(ns).count()));
if (us > microseconds::zero()) {
ztimer64_sleep(ZTIMER64_USEC, us.count());
}
}