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Release Cosmopolitan v3.6.0

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This release is an atomic upgrade to GCC 14.1.0 with C23 and C++23
This commit is contained in:
Justine Tunney 2024-07-23 03:16:17 -07:00
parent 62ace3623a
commit 5660ec4741
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GPG key ID: BE714B4575D6E328
1585 changed files with 117353 additions and 271644 deletions
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42
third_party/libcxx/__thread/poll_with_backoff.h vendored
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@ -10,7 +10,6 @@
#ifndef _LIBCPP___THREAD_POLL_WITH_BACKOFF_H
#define _LIBCPP___THREAD_POLL_WITH_BACKOFF_H
#include <__availability>
#include <__chrono/duration.h>
#include <__chrono/high_resolution_clock.h>
#include <__config>
@ -26,31 +25,31 @@ static _LIBCPP_CONSTEXPR const int __libcpp_polling_count = 64;
// Polls a thread for a condition given by a predicate, and backs off based on a backoff policy
// before polling again.
//
// - __f is the "test function" that should return true if polling succeeded, and false if it failed.
// - __poll is the "test function" that should return true if polling succeeded, and false if it failed.
//
// - __bf is the "backoff policy", which is called with the duration since we started polling. It should
// - __backoff is the "backoff policy", which is called with the duration since we started polling. It should
// return false in order to resume polling, and true if polling should stop entirely for some reason.
// In general, backoff policies sleep for some time before returning control to the polling loop.
//
// - __max_elapsed is the maximum duration to try polling for. If the maximum duration is exceeded,
// the polling loop will return false to report a timeout.
template<class _Fn, class _BFn>
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI
bool __libcpp_thread_poll_with_backoff(_Fn&& __f, _BFn&& __bf, chrono::nanoseconds __max_elapsed = chrono::nanoseconds::zero()) {
auto const __start = chrono::high_resolution_clock::now();
for (int __count = 0;;) {
if (__f())
return true; // _Fn completion means success
if (__count < __libcpp_polling_count) {
__count += 1;
continue;
}
chrono::nanoseconds const __elapsed = chrono::high_resolution_clock::now() - __start;
if (__max_elapsed != chrono::nanoseconds::zero() && __max_elapsed < __elapsed)
return false; // timeout failure
if (__bf(__elapsed))
return false; // _BFn completion means failure
template <class _Poll, class _Backoff>
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI bool __libcpp_thread_poll_with_backoff(
_Poll&& __poll, _Backoff&& __backoff, chrono::nanoseconds __max_elapsed = chrono::nanoseconds::zero()) {
auto const __start = chrono::high_resolution_clock::now();
for (int __count = 0;;) {
if (__poll())
return true; // __poll completion means success
if (__count < __libcpp_polling_count) {
__count += 1;
continue;
}
chrono::nanoseconds const __elapsed = chrono::high_resolution_clock::now() - __start;
if (__max_elapsed != chrono::nanoseconds::zero() && __max_elapsed < __elapsed)
return false; // timeout failure
if (__backoff(__elapsed))
return false; // __backoff completion means failure
}
}
// A trivial backoff policy that always immediately returns the control to
@ -60,10 +59,7 @@ bool __libcpp_thread_poll_with_backoff(_Fn&& __f, _BFn&& __bf, chrono::nanosecon
// so this should most likely only be used on single-threaded systems where there
// are no other threads to compete with.
struct __spinning_backoff_policy {
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
bool operator()(chrono::nanoseconds const&) const {
return false;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool operator()(chrono::nanoseconds const&) const { return false; }
};
_LIBCPP_END_NAMESPACE_STD