bpy_threads.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <Python.h>
 
#include "../BPY_extern.hh"
 
BPy_ThreadStatePtr BPY_thread_save()
{
  /* Use `_PyThreadState_UncheckedGet()` instead of `PyThreadState_Get()`, to avoid a fatal error
   * issued when a thread state is nullptr (the thread state can be nullptr when quitting Blender).
   *
   * `PyEval_SaveThread()` will release the GIL, so this thread has to have the GIL to begin with
   * or badness will ensue. */
  if (_PyThreadState_UncheckedGet() && PyGILState_Check()) {
    return (BPy_ThreadStatePtr)PyEval_SaveThread();
  }
  return nullptr;
}
 
void BPY_thread_restore(BPy_ThreadStatePtr tstate)
{
  if (tstate) {
    PyEval_RestoreThread((PyThreadState *)tstate);
  }
}