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/* -*- indent-tabs-mode: nil; tab-width: 4; -*- */
/**
* Implementation of greenlet::MainGreenlet.
*
* 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"
*/
#include "greenlet_greenlet.hpp"
#include "greenlet_thread_state.hpp"
// Protected by the GIL. Incremented when we create a main greenlet,
// in a new thread, decremented when it is destroyed.
static Py_ssize_t G_TOTAL_MAIN_GREENLETS;
namespace greenlet {
greenlet::PythonAllocator<MainGreenlet> MainGreenlet::allocator;
void* MainGreenlet::operator new(size_t UNUSED(count))
{
return allocator.allocate(1);
}
void MainGreenlet::operator delete(void* ptr)
{
return allocator.deallocate(static_cast<MainGreenlet*>(ptr),
1);
}
MainGreenlet::MainGreenlet(PyGreenlet* p, ThreadState* state)
: Greenlet(p, StackState::make_main()),
_self(p),
_thread_state(state)
{
G_TOTAL_MAIN_GREENLETS++;
}
MainGreenlet::~MainGreenlet()
{
G_TOTAL_MAIN_GREENLETS--;
this->tp_clear();
}
ThreadState*
MainGreenlet::thread_state() const noexcept
{
return this->_thread_state;
}
void
MainGreenlet::thread_state(ThreadState* t) noexcept
{
assert(!t);
this->_thread_state = t;
}
BorrowedGreenlet
MainGreenlet::self() const noexcept
{
return BorrowedGreenlet(this->_self.borrow());
}
const BorrowedMainGreenlet
MainGreenlet::main_greenlet() const
{
return this->_self;
}
BorrowedMainGreenlet
MainGreenlet::find_main_greenlet_in_lineage() const
{
return BorrowedMainGreenlet(this->_self);
}
bool
MainGreenlet::was_running_in_dead_thread() const noexcept
{
return !this->_thread_state;
}
OwnedObject
MainGreenlet::g_switch()
{
try {
this->check_switch_allowed();
}
catch (const PyErrOccurred&) {
this->release_args();
throw;
}
switchstack_result_t err = this->g_switchstack();
if (err.status < 0) {
// XXX: This code path is untested, but it is shared
// with the UserGreenlet path that is tested.
return this->on_switchstack_or_initialstub_failure(
this,
err,
true, // target was me
false // was initial stub
);
}
return err.the_new_current_greenlet->g_switch_finish(err);
}
int
MainGreenlet::tp_traverse(visitproc visit, void* arg)
{
if (this->_thread_state) {
// we've already traversed main, (self), don't do it again.
int result = this->_thread_state->tp_traverse(visit, arg, false);
if (result) {
return result;
}
}
return Greenlet::tp_traverse(visit, arg);
}
const OwnedObject&
MainGreenlet::run() const
{
throw AttributeError("Main greenlets do not have a run attribute.");
}
void
MainGreenlet::run(const BorrowedObject UNUSED(nrun))
{
throw AttributeError("Main greenlets do not have a run attribute.");
}
void
MainGreenlet::parent(const BorrowedObject raw_new_parent)
{
if (!raw_new_parent) {
throw AttributeError("can't delete attribute");
}
throw AttributeError("cannot set the parent of a main greenlet");
}
const OwnedGreenlet
MainGreenlet::parent() const
{
return OwnedGreenlet(); // null becomes None
}
}; // namespace greenlet
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