[Pyrex] too much work in c function

[Bryan Weingarten]

i use mozilla thunderbird as my mail/newsreader.    when i post code 
using the format  "text only".   the line endings in my code is all 
messed up when i see my own posting.   so i post with the format  "Rich 
Text (HTML) only".   now i can see my posts as i sent them, but greg 
says it's all messed up in his reader.  i'm now sending this with the 
format "Plain and Rich (HTML) Text".

---


 i'm still working on this problem where the following code is called 
from a wxPython GUI.  i have a test program that contains two buttons.  
one button calls the play method of the following class and plays an mp3 
file.  the second button is brings up a simple message dialog.   the 
problem is the when the following play method is called and the music is 
playing, you are unable to press the button to display the message 
dialog.   essentially, the GUI app is frozen until the play of the mp3 
file is finished.   i thought the PyEval_SaveThread and 
PyEval_RestoreThread would work, but not only does it not work,  the app 
crashes when you press the button the display the message dialog.  as 
suggested by simon i looked at the dsptools, but i wasn't able to get 
anything working with my app.  following is my code with the Thread 
functions added .  i've tested this with the default _callback as well 
as a callback from the calling python script.  in both cases the app 
just  hangs after the music is finished playing. i'm also not able to 
press the message dialog button while the play is happening.   what i 
was trying to accomplish is giving back control to python while the c 
code is busy, but obviously this is completely wrong.

bryan


cdef extern from "Python.h":    
    ctypedef struct PyThreadState         
    PyThreadState *  PyEval_SaveThread()
    void PyEval_RestoreThread(PyThreadState *)

cdef PyThreadState *_thread

default_callback = eval('lambda *args: 1')

cdef class Play:
    def play(self, callback=None):
        global _thread
       
        if not callback:
            callback = default_callback       
       
        self.callback = callback                               
        mpgedit_play_set_status_callback(self.ctx, _callback_wrapper, 
<void*>callback)                                   
        more = True
        _thread = NULL
        while(more):
            _thread = PyEval_SaveThread()
            more = mpgedit_play_frame(self.ctx)
        if _thread:
            PyEval_RestoreThread(_thread)
            _thread = NULL           

cdef int _callback_wrapper(void *callback, long sec, long msec) except 
*:     
    global _thread
    PyEval_RestoreThread(_thread)
    _thread = NULL
    return (<object>callback)(sec, msec)
   

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