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authorcyfraeviolae <cyfraeviolae>2024-04-03 03:17:55 -0400
committercyfraeviolae <cyfraeviolae>2024-04-03 03:17:55 -0400
commit12cf076118570eebbff08c6b3090e0d4798447a1 (patch)
tree3ba25e17e3c3a5e82316558ba3864b955919ff72 /venv/lib/python3.11/site-packages/greenlet/TGreenletGlobals.cpp
parentc45662ff3923b34614ddcc8feb9195541166dcc5 (diff)
no venv
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--- a/venv/lib/python3.11/site-packages/greenlet/TGreenletGlobals.cpp
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-/* -*- indent-tabs-mode: nil; tab-width: 4; -*- */
-/**
- * Implementation of GreenletGlobals.
- *
- * Format with:
- * clang-format -i --style=file src/greenlet/greenlet.c
- *
- *
- * Fix missing braces with:
- * clang-tidy src/greenlet/greenlet.c -fix -checks="readability-braces-around-statements"
-*/
-#ifndef T_GREENLET_GLOBALS
-#define T_GREENLET_GLOBALS
-
-#include "greenlet_refs.hpp"
-#include "greenlet_exceptions.hpp"
-#include "greenlet_thread_support.hpp"
-#include "greenlet_thread_state.hpp"
-
-namespace greenlet {
-
-// This encapsulates what were previously module global "constants"
-// established at init time.
-// This is a step towards Python3 style module state that allows
-// reloading.
-//
-// In an earlier iteration of this code, we used placement new to be
-// able to allocate this object statically still, so that references
-// to its members don't incur an extra pointer indirection.
-// But under some scenarios, that could result in crashes at
-// shutdown because apparently the destructor was getting run twice?
-class GreenletGlobals
-{
-
-public:
- const greenlet::refs::ImmortalEventName event_switch;
- const greenlet::refs::ImmortalEventName event_throw;
- const greenlet::refs::ImmortalException PyExc_GreenletError;
- const greenlet::refs::ImmortalException PyExc_GreenletExit;
- const greenlet::refs::ImmortalObject empty_tuple;
- const greenlet::refs::ImmortalObject empty_dict;
- const greenlet::refs::ImmortalString str_run;
- Mutex* const thread_states_to_destroy_lock;
- greenlet::cleanup_queue_t thread_states_to_destroy;
-
- GreenletGlobals() :
- event_switch("switch"),
- event_throw("throw"),
- PyExc_GreenletError("greenlet.error"),
- PyExc_GreenletExit("greenlet.GreenletExit", PyExc_BaseException),
- empty_tuple(Require(PyTuple_New(0))),
- empty_dict(Require(PyDict_New())),
- str_run("run"),
- thread_states_to_destroy_lock(new Mutex())
- {}
-
- ~GreenletGlobals()
- {
- // This object is (currently) effectively immortal, and not
- // just because of those placement new tricks; if we try to
- // deallocate the static object we allocated, and overwrote,
- // we would be doing so at C++ teardown time, which is after
- // the final Python GIL is released, and we can't use the API
- // then.
- // (The members will still be destructed, but they also don't
- // do any deallocation.)
- }
-
- void queue_to_destroy(ThreadState* ts) const
- {
- // we're currently accessed through a static const object,
- // implicitly marking our members as const, so code can't just
- // call push_back (or pop_back) without casting away the
- // const.
- //
- // Do that for callers.
- greenlet::cleanup_queue_t& q = const_cast<greenlet::cleanup_queue_t&>(this->thread_states_to_destroy);
- q.push_back(ts);
- }
-
- ThreadState* take_next_to_destroy() const
- {
- greenlet::cleanup_queue_t& q = const_cast<greenlet::cleanup_queue_t&>(this->thread_states_to_destroy);
- ThreadState* result = q.back();
- q.pop_back();
- return result;
- }
-};
-
-}; // namespace greenlet
-
-static const greenlet::GreenletGlobals* mod_globs;
-
-#endif // T_GREENLET_GLOBALS