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| Maemo Launcher |
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| 来源:
ChinaUnix博客 日期：
2008.03.13 21:07 (共有条评论) 我要评论 |
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Maemo Launcher
Maemo launcher launches all applications on the maemo platform. It is
there to speed up application startup by sharing some of the
initialization data of an application startup. Maemo Launcher is
composed of two parts: (i) the maemo-invoker, which is executed by
D-BUS daemon or scripts to start the given (application) service, and
(ii) maemo-launcher, a server that has initialized most of the data
used by the applications.
The maemo-invoker asks maemo-launcher to start the actual
application. Use of maemo launcher requires that application is
compiled as a shared library. There's a set of helper Debian package
rules which make an application to “automatically” use maemo-invoker
when given suitable build options. As a result, the application binary
name is linked to maemo-invoker and application (library) binary name
has .launch extension. By default the invoker will wait until the
maemo-launcher tells it that the application has exited so that it can
return the correct return value for the caller.
The maemo-launcher is a server process that has initialized
most of the data used by the applications, such as Glib types, Gtk
theme and some Gtk widget classes. When it's asked by maemo-invoker to
start an application, instead of executing the application binary, it
will dl-load that as a shared library, fork and call main(). With fork,
the initialized data is handled as copy-on-write, i.e. shared until
it's modified. If the application exits abnormally, maemo-launcher
notifies Desktop so that Desktop can inform user about it.
Because prelinking doesn't work with dl-loaded libraries, maemo
Launcher cannot speed up starting of applications where library linking
has larger effect on the startup time than AF library initializations.
It can still save memory though.
本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u1/49742/showart_495626.html
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