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Re: [platform-swt-dev] SWT produce a VM failure on a GC.getFontMetrics() call.

I've asked this very question on this mailing list in the past and I think the answer was "NO".
 
Question: Is SWT supposed NOT to crash (somehow, by refcounting used resources or whatnot) if user accidentally disposes a resource which is still selected somewhere, like a font in a GC?
 
Answer: It is OK to crash.
 
Has something changed recently?
 
 
----- Original Message -----
From: "Mike Wilson" <Mike_Wilson@xxxxxxxxxx>
To: <platform-swt-dev@xxxxxxxxxxx>
Sent: Friday, October 08, 2004 5:48 PM
Subject: Re: [platform-swt-dev] SWT produce a VM failure on a GC.getFontMetrics() call.

> True, but that does excuse the fact that SWT crashed. Seems like another
> place where an isDisposed check is needed.
>
> McQ.
>
>
>
>
> Arnaud De Muyser <
ademuyser@xxxxxxxxxx>
> Sent by:
platform-swt-dev-admin@xxxxxxxxxxx
> 10/08/04 09:03
> Please respond to
> platform-swt-dev
>
>
> To
>
platform-swt-dev@xxxxxxxxxxx
> cc
>
> Subject
> Re: [platform-swt-dev] SWT produce a VM failure on a GC.getFontMetrics()
> call.
>
>
>
>
>
>
>
> Seek in it before sent mail .... Sorry.
>
> This is due to the following situation:
>
> Font font = new Font( ... );
> gc.setFont( font );
> font.dispose();
> gc.getFontMetrics() => core.
>
> The right think is to not dispose font after set it in a gc ...
>
>
>
> Arnaud De
Muyser/France/IBM@IBMFR
> Sent by:
platform-swt-dev-admin@xxxxxxxxxxx
> 10/08/2004 02:37 PM
>
> Please respond to
> platform-swt-dev
>
>
> To
>
platform-swt-dev@xxxxxxxxxxx
> cc
>
> Subject
> [platform-swt-dev] SWT produce a VM failure on a GC.getFontMetrics() call.
>
>
>
>
>
>
>
>
>
> Does anyone have already seen this kind of joke ?
> Using Eclipse SDK 3.0.1 on a Linux Suse.
> Thanks for your help.
> Arnaud.
>
>
> ** (<unknown>:668): CRITICAL **: file pango-fontmap.c: line 126
> (pango_font_map_load_fontset): assertion
> `pango_font_description_get_family (desc) != NULL' failed
>
> ** (<unknown>:668): CRITICAL **: file pango-fontset.c: line 101
> (pango_fontset_get_metrics): assertion `fontset != NULL' failed
>
> (<unknown>:668): GLib-GObject-CRITICAL **: file gobject.c: line 1337
> (g_object_unref): assertion `G_IS_OBJECT (object)' failed
>
> ** (<unknown>:668): CRITICAL **: file fonts.c: line 1206
> (pango_font_metrics_get_ascent): assertion `metrics != NULL' failed
>
> ** (<unknown>:668): CRITICAL **: file fonts.c: line 1226
> (pango_font_metrics_get_descent): assertion `metrics != NULL' failed
>
> ** (<unknown>:668): CRITICAL **: file fonts.c: line 1245
> (pango_font_metrics_get_approximate_char_width): assertion `metrics !=
> NULL' failed
>
> ** (<unknown>:668): CRITICAL **: file fonts.c: line 1182
> (pango_font_metrics_unref): assertion `metrics != NULL' failed
>
> ** (<unknown>:668): CRITICAL **: file pango-fontmap.c: line 126
> (pango_font_map_load_fontset): assertion
> `pango_font_description_get_family (desc) != NULL' failed
>
> ** (<unknown>:668): CRITICAL **: file pango-fontset.c: line 101
> (pango_fontset_get_metrics): assertion `fontset != NULL' failed
>
> (<unknown>:668): GLib-GObject-CRITICAL **: file gobject.c: line 1337
> (g_object_unref): assertion `G_IS_OBJECT (object)' failed
>
> ** (<unknown>:668): CRITICAL **: file fonts.c: line 1206
> (pango_font_metrics_get_ascent): assertion `metrics != NULL' failed
>
> ** (<unknown>:668): CRITICAL **: file fonts.c: line 1226
> (pango_font_metrics_get_descent): assertion `metrics != NULL' failed
>
> ** (<unknown>:668): CRITICAL **: file fonts.c: line 1245
> (pango_font_metrics_get_approximate_char_width): assertion `metrics !=
> NULL' failed
>
> ** (<unknown>:668): CRITICAL **: file fonts.c: line 1182
> (pango_font_metrics_unref): assertion `metrics != NULL' failed
>
> An unexpected exception has been detected in native code outside the VM.
> Unexpected Signal : 11 occurred at PC=0x400E49DF
> Function=strlen+0xF
> Library=/lib/libc.so.6
>
> Current Java thread:
>        at org.eclipse.swt.internal.gtk.OS.pango_context_get_metrics(Native
> Method)
>        - locked <0x4831db20> (a java.lang.Class)
>        at org.eclipse.swt.graphics.GC.getFontMetrics(GC.java:1472)
>                at ....
>
> and Sun's VM (1.4.2) produce a core file ...
>
> _______________________________________________
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>
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