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fc63e2906b
Most of the commands can only be called if we have the GIL: retrieve it. Add a controlled type to automatically retrieve/free the GIL. Lock every call using Py_INCREF/Py_DECREF. Change-Id: I8989fcb3eacf6aedbb90056469536144a2795a3f
67 lines
3.3 KiB
Ada
67 lines
3.3 KiB
Ada
------------------------------------------------------------------------------
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-- G N A T C O L L --
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-- --
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-- Copyright (C) 2003-2021, AdaCore --
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-- --
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-- This library is free software; you can redistribute it and/or modify it --
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-- under terms of the GNU General Public License as published by the Free --
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-- Software Foundation; either version 3, or (at your option) any later --
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-- version. This library is distributed in the hope that it will be useful, --
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
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-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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------------------------------------------------------------------------------
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-- Subprograms to manipulate GIL state and wrapper to simplify such
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-- operations in Ada code.
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with Ada.Finalization;
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package GNATCOLL.Python.State is
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type Ada_GIL_Lock is new Ada.Finalization.Limited_Controlled with private;
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-- This type is a wrapper around PyGILState_Ensure/Release, to avoid
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-- manual call to release, especially in the case of an exception.
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type PyGILState_STATE is private;
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PyGILState_LOCKED : constant PyGILState_STATE;
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PyGILState_UNLOCKED : constant PyGILState_STATE;
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function PyGILState_Ensure return PyGILState_STATE;
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pragma Import (C, PyGILState_Ensure, "ada_PyGILState_Ensure");
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-- Ensure that the current thread is ready to call the Python C API
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-- regardless of the current state of Python, or of the global
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-- interpreter lock. This may be called as many times as desired by a
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-- thread as long as each call is matched with a call to
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-- PyGILState_Release().
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procedure PyGILState_Release (State : PyGILState_STATE);
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pragma Import (C, PyGILState_Release, "ada_PyGILState_Release");
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-- Release any resources previously acquired. After this call, Python's
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-- state will be the same as it was prior to the corresponding
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-- PyGILState_Ensure().
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private
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overriding procedure Initialize (Self : in out Ada_GIL_Lock);
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overriding procedure Finalize (Self : in out Ada_GIL_Lock);
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type Ada_GIL_Lock is new Ada.Finalization.Limited_Controlled with record
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State : PyGILState_STATE;
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end record;
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type PyGILState_STATE is new Integer;
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PyGILState_LOCKED : constant PyGILState_STATE := 0;
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PyGILState_UNLOCKED : constant PyGILState_STATE := 1;
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end GNATCOLL.Python.State;
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