09-20-2008
Creating an array to hold posix thread ids: Only dynamic array works
I am facing a strange error while creating posix threads:
Given below are two snippets of code, the first one works whereas the second one gives a garbage value in the output.
Snippet 1
This works:
--------------
int *threadids;
threadids = (int *) malloc (num_threads * sizeof(int));
for(i = 0; i<num_threads; i++)
threadids[i] = i;
for(i=0; i<num_threads; i++)
pthread_create(&threads[i], NULL, pthread_init, &threadids[i]);
.
.
void *pthread_init(void *threadid)
{
int tid;
tid = (int)(*(int *)threadid));
printf("Thread id is %d", tid);
pthread_exit(NULL);
}
Output: Thread id is 0
--------------
Snippet 2
This doesn't work:
--------------
int threadids[num_threads];
for(i = 0; i<num_threads; i++)
threadids[i] = i;
.
.
.
Output: Thread id is 634800
--------------
As you can see, the only difference is in the way the array threadids is declared. But the second snippet gives a garbage value.
I will be glad if someone points out whats going wrong with the first snippet. Thanks.
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geo::googleearth::pluggable::base
Geo::GoogleEarth::Pluggable::Base(3pm) User Contributed Perl Documentation Geo::GoogleEarth::Pluggable::Base(3pm)
NAME
Geo::GoogleEarth::Pluggable::Base - Geo::GoogleEarth::Pluggable Base package
SYNOPSIS
use base qw{Geo::GoogleEarth::Pluggable::Base};
DESCRIPTION
The is the base of all Geo::GoogleEarth::Pluggable packages.
USAGE
CONSTRUCTOR
new
my $document = Geo::GoogleEarth::Pluggable->new(key1=>value1,
key2=>[value=>{opt1=>val1}],
key3=>{value=>{opt2=>val2}});
METHODS
document
Always returns the document object. Every object should know what document it is in.
name
Sets or returns the name property.
my $name=$folder->name;
$placemark->name("New Name");
$document->name("New Name");
description
Sets or returns the description property.
my $description=$folder->description;
$placemark->description("New Description");
$document->description("New Description");
Snippet
Returns the Snippet used in the Snippet XML element or a Placemark. The default Snippet from Google Earth is to use the first line of the
description however this package defaults to a zero line Snippet.
Snippet is rendered with maxLines as the length of the array ref and the content joined with new lines.
Typical use
$document->Point(Snippet=>"Line 1");
$document->Point(Snippet=>["Line 1", "Line 2"]);
Extended used
my $snippet=$placemark->Snippet; #[] always array reference
$placemark->Snippet([]); #default
$placemark->Snippet(["line 1", "line 2", "line 3"]);
$placemark->Snippet("My Snippet Text"); #folded into array reference.
$placemark->Snippet("line 1", "line 2", "line 3"); #folded into array reference
lookat
Sets or returns a Geo::GoogleEarth::Pluggable::LookAt object
BUGS
Please log on RT and send to the geo-perl email list.
SUPPORT
DavisNetworks.com supports all Perl applications including this package.
AUTHOR
Michael R. Davis (mrdvt92)
CPAN ID: MRDVT
COPYRIGHT
This program is free software licensed under the...
The BSD License
The full text of the license can be found in the LICENSE file included with this module.
SEE ALSO
Geo::GoogleEarth::Pluggable creates a GoogleEarth Document.
perl v5.14.2 2011-06-26 Geo::GoogleEarth::Pluggable::Base(3pm)