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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