8/12/2019 hw4hw4hw4hw4hw4hw4hw4hw4hw4hw4hw4hw4hw4hw4hw4
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Operating Systems
HW Assignment #4
In this assignment, you will have to extend/refator the !logging
system" you have developed in the
assignment # to inlude some additional features$ %he new logging
system will support &oth file
and ''()&ased logging with relevant funtionality pa*ed into
+s$
-$ (irst, you have to develop two +s with the same set of
exported funtions &ut with a &it
different funtionality$ %he +s .alled mmflog$dll and
filelog$dll0 should implement funtions
for logging using ''( and dis* file storage respetively$ %he +s
will exported following
funtions1
HA2+3 Startogging .5%S%6 logname,
+WO6+ dwogSi7e,
+WO6+ dw%imeout0
a$ %his funtion will &e used &y writers and readers to
initiali7e ''( or (ile)&ased log file
&$ HA2+3 is 8 &it value .typedef 9OI+ HA2+30 that
represents the log instane$ :se .HA2+30)- return value to for an
error
d$ dw%imeout to use for all synhroni7ations waits
9OI+ Stopogging.HA2+3 hog0
a$ %his funtion is used &y writers and the viewer to stop
logging and to free all unneeded
resoures .handles, memory ,files0
&$ Aepts handle to a log file previously o&tained from
Startogging funtion
+WO6+ Writeog3ntry.HA2+3 hog0
a$ %his funtion is used &y writers to write a log entry
&$ 6eturns a se;uene num&er of suessfully written log
entry
? pog3ntry0
a$ %his funtion is used &y the viewer to read log entry
&$ If there is no log entries, the funtion should return
false .does not wait if log file is
empty0
$ O=32%6> is defined as strut @+WO6+ dw%ime+WO6+ dwSB2 +WO6+
dwI+,
+WO6+ dwSumC
HA2+3 =etogWaitO&Det.HA2+3 hog0
a$ %his funtion is used &y the viewer proess to o&tain a
handle for a win8 waita&le
o&Det .e$g$ semaphore0 that is signaled when there are log
entries in the log file
8$ A proess .e$g$ writer proess0 should load one of these +s
a&ove at run time depending on
the ommand line argument it reeives$ In order to ma*e it easy
for all future developers to use
this funtionality, you will need to wrap the + loading proess
into another + .glog$dll0
whih will &e lin*ed to exeuta&les using ompile time
&inding$ %his !generali7ed log" +
should export following set of funtions1
