Re: [Matplotlib-users] matplotlib with Qt4 backend
Thanks!
I can confirm the patches fixes the issue on my computer.
Celil
On Thu, Nov 12, 2009 at 9:33 AM, Jouni K. Seppänen wrote:
> Celil Rufat writes:
>
> > However, when I try one of the Qt4 examles:
> [...]
> > File
> >
> "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py",
> > line 303, in get_fontconfig_fonts
> > status, output = commands.getstatusoutput("fc-list file")
> > File
> >
> "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/commands.py",
> > line 56, in getstatusoutput
> > text = pipe.read()
> > IOError: [Errno 4] Interrupted system call
>
> I believe the attached patch (already committed to the trunk) should fix
> this on Python 2.6, but I don't have a Qt installation to try it out
> with. Can you try this on your system?
>
> --
> Jouni K. Seppänen
> http://www.iki.fi/jks
>
>
>
> --
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
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Re: [Matplotlib-users] matplotlib with Qt4 backend
On 2009-11-12 16:44 PM, Andrew Straw wrote:
> Robert Kern wrote:
>> On 2009-11-12 12:05 PM, Andrew Straw wrote:
>>
>>> Celil Rufat wrote:
>>>
I just installed matplotlib on Snow Leopard 10.6 with the Qt4 backend
(via macports). However, when I try one of the Qt4 examles:
python
/opt/local/share/py26-matplotlib/examples/user_interfaces/embedding_in_qt4.py
IOError: [Errno 4] Interrupted system call
Any ideas on what could be causing this?
>>> Out of curiosity, does anyone know where the signal interrupting the
>>> system call is originating? Is this a standard communication mechanism
>>> within Qt4? (I have never used Qt4.) I'm interested in knowing about OSS
>>> that use signals as a means of across-thread or across-process
>>> communication.
>>>
>>
>> This problem arises when signal handlers are installed, not necessarily when
>> a
>> signal itself is sent (dtrace doesn't detect any).
> Hmm, but a system call isn't going to get interrupted and return EINTR
> by any means other than a signal. So the OP must have had a signal
> interrupting the call and it must have come from somewhere. Or... am I
> wrong?
Well, SIGCHLD is sent by the OS when the child process completes. There is a
SIGCHLD handler registered in ./src/corelib/io/qprocess_unix.cpp . I'm not sure
how to avoid it, though.
I think I can verify this now:
$ really dtrace -n 'proc:::signal-handle /pid==$target/ { ustack();
printf("Signal: %d\n", arg0);}' -c "python application.py"
dtrace: description 'proc:::signal-handle ' matched 2 probes
Traceback (most recent call last):
File "application.py", line 247, in
commands.getstatusoutput( "otool -L %s | grep libedit" % _rl.__file__ )
File
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/commands.py",
line 54, in getstatusoutput
text = pipe.read()
IOError: [Errno 4] Interrupted system call
dtrace: pid 47973 has exited
CPU IDFUNCTION:NAME
1 18577sendsig:signal-handle
libSystem.B.dylib`read+0xa
libSystem.B.dylib`__srefill+0x127
libSystem.B.dylib`fread+0x9f
0x1c2d9b
0x23affa
0x23bde1
0x23c7fa
0x23c907
0x260d37
0x2610e3
0x26f855
python`0x1f82
python`0x1ea9
0x2
Signal: 20
$ python -c "import signal;print signal.SIGCHLD"
20
So it is getting SIGCHLD. I think my previous probes weren't getting signals
from the OS itself.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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Re: [Matplotlib-users] matplotlib with Qt4 backend
Robert Kern wrote: > On 2009-11-12 12:05 PM, Andrew Straw wrote: > >> Celil Rufat wrote: >> >>> I just installed matplotlib on Snow Leopard 10.6 with the Qt4 backend >>> (via macports). However, when I try one of the Qt4 examles: >>> >>> python >>> /opt/local/share/py26-matplotlib/examples/user_interfaces/embedding_in_qt4.py >>> >>> >>> IOError: [Errno 4] Interrupted system call >>> >>> Any ideas on what could be causing this? >>> >> Out of curiosity, does anyone know where the signal interrupting the >> system call is originating? Is this a standard communication mechanism >> within Qt4? (I have never used Qt4.) I'm interested in knowing about OSS >> that use signals as a means of across-thread or across-process >> communication. >> > > This problem arises when signal handlers are installed, not necessarily when > a > signal itself is sent (dtrace doesn't detect any). Hmm, but a system call isn't going to get interrupted and return EINTR by any means other than a signal. So the OP must have had a signal interrupting the call and it must have come from somewhere. Or... am I wrong? > PyQt4 doesn't do it, but I > think something in QApplication does. I really don't know what, though. Here > are > the files that call signal(3) or sigaction(3): > > ./src/3rdparty/freetype/src/tools/ftrandom/ftrandom.c > ./src/3rdparty/phonon/qt7/quicktimevideoplayer.mm > ./src/3rdparty/sqlite/shell.c > ./src/3rdparty/webkit/JavaScriptCore/jsc.cpp > ./src/corelib/io/qfilesystemwatcher_dnotify.cpp > ./src/corelib/io/qprocess_unix.cpp > ./src/corelib/kernel/qcrashhandler.cpp > ./src/corelib/kernel/qeventdispatcher_unix.cpp > ./src/gui/embedded/qwindowsystem_qws.cpp > ./src/gui/embedded/qwssignalhandler.cpp > ./tools/qvfb/main.cpp > > It's not obvious to me that any of these are activated on OS X (the > qcrashhandler.cpp file is intriguing, but it only seems to be used in the X11 > QApplication). dtrace doesn't actually show either signal(3) or sigaction(3) > being called at all. Actually, running a program under dtrace while probing > those functions makes the problem go away. Sometimes. > Ahh, a fun Heisenbug. OK, well if I decide to look for programs that use signals as a means of communication, I'll investigate Qt further. I asked because there's a proprietary library I'm forced to use that does communicate internally with signals. It's a real pain, however, because it means anything else in that process also gets hit with signals and so system calls must be EINTR safe. -Andrew -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] matplotlib with Qt4 backend
On 2009-11-12 12:05 PM, Andrew Straw wrote: > Celil Rufat wrote: >> I just installed matplotlib on Snow Leopard 10.6 with the Qt4 backend >> (via macports). However, when I try one of the Qt4 examles: >> >> python >> /opt/local/share/py26-matplotlib/examples/user_interfaces/embedding_in_qt4.py >> >> >> IOError: [Errno 4] Interrupted system call >> >> Any ideas on what could be causing this? > Out of curiosity, does anyone know where the signal interrupting the > system call is originating? Is this a standard communication mechanism > within Qt4? (I have never used Qt4.) I'm interested in knowing about OSS > that use signals as a means of across-thread or across-process > communication. This problem arises when signal handlers are installed, not necessarily when a signal itself is sent (dtrace doesn't detect any). PyQt4 doesn't do it, but I think something in QApplication does. I really don't know what, though. Here are the files that call signal(3) or sigaction(3): ./src/3rdparty/freetype/src/tools/ftrandom/ftrandom.c ./src/3rdparty/phonon/qt7/quicktimevideoplayer.mm ./src/3rdparty/sqlite/shell.c ./src/3rdparty/webkit/JavaScriptCore/jsc.cpp ./src/corelib/io/qfilesystemwatcher_dnotify.cpp ./src/corelib/io/qprocess_unix.cpp ./src/corelib/kernel/qcrashhandler.cpp ./src/corelib/kernel/qeventdispatcher_unix.cpp ./src/gui/embedded/qwindowsystem_qws.cpp ./src/gui/embedded/qwssignalhandler.cpp ./tools/qvfb/main.cpp It's not obvious to me that any of these are activated on OS X (the qcrashhandler.cpp file is intriguing, but it only seems to be used in the X11 QApplication). dtrace doesn't actually show either signal(3) or sigaction(3) being called at all. Actually, running a program under dtrace while probing those functions makes the problem go away. Sometimes. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] matplotlib with Qt4 backend
Celil Rufat wrote: > I just installed matplotlib on Snow Leopard 10.6 with the Qt4 backend > (via macports). However, when I try one of the Qt4 examles: > > python > /opt/local/share/py26-matplotlib/examples/user_interfaces/embedding_in_qt4.py > > > IOError: [Errno 4] Interrupted system call > > Any ideas on what could be causing this? Out of curiosity, does anyone know where the signal interrupting the system call is originating? Is this a standard communication mechanism within Qt4? (I have never used Qt4.) I'm interested in knowing about OSS that use signals as a means of across-thread or across-process communication. -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] matplotlib with Qt4 backend
Celil Rufat writes:
> However, when I try one of the Qt4 examles:
[...]
> File
> "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py",
> line 303, in get_fontconfig_fonts
> status, output = commands.getstatusoutput("fc-list file")
> File
> "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/commands.py",
> line 56, in getstatusoutput
> text = pipe.read()
> IOError: [Errno 4] Interrupted system call
I believe the attached patch (already committed to the trunk) should fix
this on Python 2.6, but I don't have a Qt installation to try it out
with. Can you try this on your system?
--
Jouni K. Seppänen
http://www.iki.fi/jks
Index: lib/matplotlib/font_manager.py
===
--- lib/matplotlib/font_manager.py (revision 7951)
+++ lib/matplotlib/font_manager.py (working copy)
@@ -42,7 +42,7 @@
see license/LICENSE_TTFQUERY.
"""
-import os, sys, glob
+import os, sys, glob, subprocess
try:
set
except NameError:
@@ -292,16 +292,12 @@
grab all of the fonts the user wants to be made available to
applications, without needing knowing where all of them reside.
"""
-try:
-import commands
-except ImportError:
-return {}
-
fontext = get_fontext_synonyms(fontext)
fontfiles = {}
-status, output = commands.getstatusoutput("fc-list file")
-if status == 0:
+pipe = subprocess.Popen(['fc-list', '', 'file'], stdout=subprocess.PIPE)
+output = pipe.communicate()[0]
+if pipe.returncode == 0:
for line in output.split('\n'):
fname = line.split(':')[0]
if (os.path.splitext(fname)[1][1:] in fontext and
@@ -1244,11 +1240,11 @@
import re
def fc_match(pattern, fontext):
-import commands
fontexts = get_fontext_synonyms(fontext)
ext = "." + fontext
-status, output = commands.getstatusoutput('fc-match -sv "%s"' % pattern)
-if status == 0:
+pipe = subprocess.Popen(['fc-match', '-sv', pattern], stdout=subprocess.PIPE)
+output = pipe.communicate()[0]
+if pipe.returncode == 0:
for match in _fc_match_regex.finditer(output):
file = match.group(1)
if os.path.splitext(file)[1][1:] in fontexts:
--
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[Matplotlib-users] matplotlib with Qt4 backend
I just installed matplotlib on Snow Leopard 10.6 with the Qt4 backend (via
macports). However, when I try one of the Qt4 examles:
python
/opt/local/share/py26-matplotlib/examples/user_interfaces/embedding_in_qt4.py
I get the following error message:
Traceback (most recent call last):
File
"/opt/local/share/py26-matplotlib/examples/user_interfaces/embedding_in_qt4.py",
line 70, in update_figure
self.draw()
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_qt4agg.py",
line 130, in draw
FigureCanvasAgg.draw(self)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_agg.py",
line 314, in draw
self.figure.draw(self.renderer)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py",
line 46, in draw_wrapper
draw(artist, renderer, *kl)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/figure.py",
line 773, in draw
for a in self.axes: a.draw(renderer)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py",
line 46, in draw_wrapper
draw(artist, renderer, *kl)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axes.py",
line 1735, in draw
a.draw(renderer)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py",
line 46, in draw_wrapper
draw(artist, renderer, *kl)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py",
line 742, in draw
tick.draw(renderer)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py",
line 46, in draw_wrapper
draw(artist, renderer, *kl)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py",
line 196, in draw
self.label1.draw(renderer)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/text.py",
line 515, in draw
bbox, info = self._get_layout(renderer)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/text.py",
line 272, in _get_layout
'lp', self._fontproperties, ismath=False)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_agg.py",
line 158, in get_text_width_height_descent
font = self._get_agg_font(prop)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_agg.py",
line 195, in _get_agg_font
fname = findfont(prop)
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py",
line 1308, in findfont
_rebuild()
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py",
line 1292, in _rebuild
fontManager = FontManager()
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py",
line 984, in __init__
self.ttffiles = findSystemFonts(paths) + findSystemFonts()
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py",
line 341, in findSystemFonts
for f in get_fontconfig_fonts(fontext):
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py",
line 303, in get_fontconfig_fonts
status, output = commands.getstatusoutput("fc-list file")
File
"/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/commands.py",
line 56, in getstatusoutput
text = pipe.read()
IOError: [Errno 4] Interrupted system call
Any ideas on what could be causing this?
celil
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