84 lines
2.1 KiB
C++
84 lines
2.1 KiB
C++
/* Stack allocation implementation for coroutine contexts.
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* For Windows systems only, other implementations are stored elsewhere.
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*
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* This file is part of libostd. See COPYING.md for futher information.
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*/
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#include "ostd/platform.hh"
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#ifndef OSTD_PLATFORM_WIN32
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# error "Incorrect platform"
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#endif
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#include <cstddef>
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#include <cstdlib>
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#include <new>
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#include <mutex>
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#include "ostd/context_stack.hh"
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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namespace ostd {
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namespace detail {
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OSTD_EXPORT void *stack_alloc(std::size_t sz) {
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void *p = VirtualAlloc(0, sz, MEM_COMMIT, PAGE_READWRITE);
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if (!p) {
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throw std::bad_alloc{};
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}
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return p;
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}
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OSTD_EXPORT void stack_free(void *p, std::size_t) noexcept {
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VirtualFree(p, 0, MEM_RELEASE);
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}
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OSTD_EXPORT std::size_t stack_main_size() noexcept {
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/* 4 MiB for Windows... */
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}
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OSTD_EXPORT void stack_protect(void *p, std::size_t sz) noexcept {
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DWORD oo;
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VirtualProtect(p, sz, PAGE_READWRITE | PAGE_GUARD, &oo);
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}
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/* used by stack traits */
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inline void ctx_pagesize(std::size_t *s) noexcept {
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SYSTEM_INFO si;
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GetSystemInfo(&si);
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*s = std::size_t(si.dwPageSize);
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}
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} /* namespace detail */
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OSTD_EXPORT bool stack_traits::is_unbounded() noexcept {
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return true;
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}
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OSTD_EXPORT std::size_t stack_traits::page_size() noexcept {
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static std::size_t size = 0;
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static std::once_flag fl;
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std::call_once(fl, detail::ctx_pagesize, &size);
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return size;
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}
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OSTD_EXPORT std::size_t stack_traits::minimum_size() noexcept {
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/* no func on Windows, sane default of 8 KiB */
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return 8 * 1024;
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}
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OSTD_EXPORT std::size_t stack_traits::maximum_size() noexcept {
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/* value is technically undefined when is_unbounded() is
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* true, just default to 1 GiB so we actually return something
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*/
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return 1024 * 1024 * 1024;
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}
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OSTD_EXPORT std::size_t stack_traits::default_size() noexcept {
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/* no func on Windows either, default to 64 KiB */
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return 8 * 8 * 1024;
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}
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} /* namespace ostd */
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