1. 01 Feb, 2013 1 commit
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  3. 29 Jan, 2013 1 commit
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  5. 27 Jan, 2013 11 commits
  6. 26 Jan, 2013 15 commits
  7. 25 Jan, 2013 1 commit
    • Matěj Laitl's avatar
      Fix calling an "except +" cpp function in a nogil function · 6eb0745f
      Matěj Laitl authored
      For a source:
      |cdef extern from "<foo>":
      |    cdef void foo_cpp() nogil except +
      |
      |cdef call_foo() nogil:
      |    foo_cpp()
      
      We used to generate something like this to actually call foo_cpp() in call_foo():
      |try{foo_cpp();}
      |catch(...) {
      |  Py_BLOCK_THREADS; __Pyx_CppExn2PyErr(); Py_UNBLOCK_THREADS
      |  `code.error_goto(self.pos))`
      |}
      
      where Py_BLOCK_THREADS expands to "PyEval_RestoreThread(_save);".
      __Pyx_CppExn2PyErr() (and alternatives, see SimpleCallNode) calls CPython A API
      methods so it needs to be guarded in a nogil environment.
      
      One problem is that "PyThreadState *_save" is only declared by "with nogil:"
      block, so a .cpp file that doesn't compile is generated for the above code.
      
      However, I think the real issue is that Py_(UN)BLOCK_THREADS is inappropriate
      here, as it isn't allowed to be called recursively and is valid only directly
      in a Py_BEGIN_ALLOW_THREADS ... Py_END_ALLOW_THREADS. IMO PyGILState_Ensure()
      and PyGILState_Release() (through `code.put_ensure_gil()` and a friend) is the
      correct thing to call here as it is allowed to be called recursively and
      actually ensures the current thread can call CPython C API.
      
      This patch does exactly this (and it breaks the generated code to multiple
      lines as it would be way too long otherwise), plus it extends the
      cpp_exceptions_nogil.pyx test with above example that doesn't compile with this
      fix not applied.
      
      Note that we explicitly pass declare_gilstate=True to put_ensure_gil(), as
      PyGILState_Ensure() docs state that recursive calls to it must not share the
      PyGILState_STATE. C++-style declaring a variable inside a block should be
      no-problem here, as try{} .. catch() is obviously valid only in a C++ code.
      
      --HG--
      extra : transplant_source : %AA%F3%BDk%FE%F9%01%7F%8C%A4n%5E%DA4%97%A5%D9%AF%D60
      6eb0745f
  8. 26 Jan, 2013 1 commit