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Top Forums Programming A simple C program query ... Post 302569259 by Praveen_218 on Sunday 30th of October 2011 12:07:01 PM
Old 10-30-2011
Imagine that the lock is already taken, then following cases arise:
1) What if the task is not the same (which is possible and ext3_write_super() is callable concurrently (via VFS) from different kernel thread contexts which is writing on a same file system (on different volumes or same one for different writes).

In this case using sb->s_dirt in anyway is wrong.

2) Even if it's the same task which has taken lock before calling ext3_write_super() the if() block should test if (mutex_trylock(&sb->s_lock) == 0) instead of if (mutex_trylock(&sb->s_lock) != 0) .

By testing for if (mutex_trylock(&sb->s_lock) != 0) ; on new lock just taken it's calling BUG() which is designed to dump core only.
 

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XmScrollVisible(library call)											     XmScrollVisible(library call)

NAME
XmScrollVisible -- A ScrolledWindow function that makes an invisible descendant of a ScrolledWindow work area visible SYNOPSIS
#include <Xm/ScrolledW.h> void XmScrollVisible( Widget scrollw_widget, Widget widget, Dimension left_right_margin, Dimension top_bottom_margin); DESCRIPTION
XmScrollVisible makes an obscured or partially obscured widget or gadget descendant of a ScrolledWindow work area visible. The function re- positions the work area and sets the specified margins between the widget and the nearest viewport boundary. The widget's location relative to the viewport determines whether one or both of the margins must be adjusted. This function requires that the XmNscrollingPolicy of the ScrolledWindow widget be set to XmAUTOMATIC. scrollw_widget Specifies the ID of the ScrolledWindow widget whose work area window contains an obscured descendant. widget Specifies the ID of the widget to be made visible. left_right_margin Specifies the margin to establish between the left or right edge of the widget and the associated edge of the viewport. This margin is established only if the widget must be moved horizontally to make it visible. top_bottom_margin Specifies the margin to establish between the top or bottom edge of the widget and the associated edge of the viewport. This margin is established only if the widget must be moved vertically to make it visible. For a complete definition of ScrolledWindow and its associated resources, see XmScrolledWindow(3) RELATED
XmScrolledWindow(3). XmScrollVisible(library call)
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