95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
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/* -*- indent-tabs-mode: nil; tab-width: 4; -*- */
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/**
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* Implementation of GreenletGlobals.
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*
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* Format with:
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* clang-format -i --style=file src/greenlet/greenlet.c
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*
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*
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* Fix missing braces with:
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* clang-tidy src/greenlet/greenlet.c -fix -checks="readability-braces-around-statements"
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*/
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#ifndef T_GREENLET_GLOBALS
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#define T_GREENLET_GLOBALS
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#include "greenlet_refs.hpp"
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#include "greenlet_exceptions.hpp"
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#include "greenlet_thread_support.hpp"
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#include "greenlet_thread_state.hpp"
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namespace greenlet {
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// This encapsulates what were previously module global "constants"
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// established at init time.
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// This is a step towards Python3 style module state that allows
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// reloading.
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//
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// In an earlier iteration of this code, we used placement new to be
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// able to allocate this object statically still, so that references
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// to its members don't incur an extra pointer indirection.
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// But under some scenarios, that could result in crashes at
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// shutdown because apparently the destructor was getting run twice?
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class GreenletGlobals
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{
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public:
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const greenlet::refs::ImmortalEventName event_switch;
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const greenlet::refs::ImmortalEventName event_throw;
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const greenlet::refs::ImmortalException PyExc_GreenletError;
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const greenlet::refs::ImmortalException PyExc_GreenletExit;
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const greenlet::refs::ImmortalObject empty_tuple;
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const greenlet::refs::ImmortalObject empty_dict;
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const greenlet::refs::ImmortalString str_run;
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Mutex* const thread_states_to_destroy_lock;
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greenlet::cleanup_queue_t thread_states_to_destroy;
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GreenletGlobals() :
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event_switch("switch"),
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event_throw("throw"),
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PyExc_GreenletError("greenlet.error"),
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PyExc_GreenletExit("greenlet.GreenletExit", PyExc_BaseException),
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empty_tuple(Require(PyTuple_New(0))),
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empty_dict(Require(PyDict_New())),
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str_run("run"),
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thread_states_to_destroy_lock(new Mutex())
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{}
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~GreenletGlobals()
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{
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// This object is (currently) effectively immortal, and not
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// just because of those placement new tricks; if we try to
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// deallocate the static object we allocated, and overwrote,
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// we would be doing so at C++ teardown time, which is after
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// the final Python GIL is released, and we can't use the API
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// then.
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// (The members will still be destructed, but they also don't
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// do any deallocation.)
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}
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void queue_to_destroy(ThreadState* ts) const
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{
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// we're currently accessed through a static const object,
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// implicitly marking our members as const, so code can't just
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// call push_back (or pop_back) without casting away the
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// const.
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//
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// Do that for callers.
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greenlet::cleanup_queue_t& q = const_cast<greenlet::cleanup_queue_t&>(this->thread_states_to_destroy);
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q.push_back(ts);
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}
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ThreadState* take_next_to_destroy() const
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{
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greenlet::cleanup_queue_t& q = const_cast<greenlet::cleanup_queue_t&>(this->thread_states_to_destroy);
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ThreadState* result = q.back();
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q.pop_back();
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return result;
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}
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};
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}; // namespace greenlet
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static const greenlet::GreenletGlobals* mod_globs;
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#endif // T_GREENLET_GLOBALS
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