Programming Forums > Application Development > C

nannu · May 5th, 2008, 5:56 PM

Fairly new to programming. Any advice would be appreciated.
Thanks in advance

OK, I am using Microsoft Visual C++ for all of my C++ programming. We have done some very basic code just to get an overview of what is going on. I have found some code below, this code is pretty long compared to what we have done as we skimmed over the programs. But in MS Visual C++ how would I put this into the program.

THREADS:

 c Syntax (Toggle Plain Text) 
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
 
int myglobal;
 
void *thread_function(void *arg) {
int i,j;
for ( i=0; i<20; i++ ) {
j=myglobal;
j=j+1;
printf(".");
fflush(stdout);
sleep(1);
myglobal=j;
}
return NULL;
}
 
int main(void) {
 
pthread_t mythread;
int i;
 
if ( pthread_create( &mythread, NULL, thread_function, NULL) ) {
printf("error creating thread.");
abort();
}
 
for ( i=0; i<20; i++) {
myglobal=myglobal+1;
printf("o");
fflush(stdout);
sleep(1);
}
 
if ( pthread_join ( mythread, NULL ) ) {
printf("error joining thread.");
abort();
}
 
printf("\nmyglobal equals %d\n",myglobal);
 
exit(0);
}
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>

int myglobal;

void *thread_function(void *arg) {
int i,j;
for ( i=0; i<20; i++ ) {
j=myglobal;
j=j+1;
printf(".");
fflush(stdout);
sleep(1);
myglobal=j;
}
return NULL;
}

int main(void) {

pthread_t mythread;
int i;

if ( pthread_create( &mythread, NULL, thread_function, NULL) ) {
printf("error creating thread.");
abort();
}

for ( i=0; i<20; i++) {
myglobal=myglobal+1;
printf("o");
fflush(stdout);
sleep(1);
}

if ( pthread_join ( mythread, NULL ) ) {
printf("error joining thread.");
abort();
}

printf("\nmyglobal equals %d\n",myglobal);

exit(0);
}

OK what I am doing is when I open up the project I create the work space and give it a name. Now when I copy this code into the project and click compile, I get 1 error saying "Cannot open include file: 'pthread.h': No such file or directory". Now I know that in C++ you can have are .cpp file and a .h file. Now how can I prevent this from happening. I tried changing it up a little. I created a header file and pasted this part in it:

 c Syntax (Toggle Plain Text) 
#include <iostream>
//#include <FK2008Sample2.h>
 
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <FK2008Sample>
int myglobal;
 
void *thread_function(void *arg) {
int i,j;
for ( i=0; i<20; i++ ) {
j=myglobal;
j=j+1;
printf(".");
fflush(stdout);
sleep(1);
myglobal=j;
}
return NULL;
}
#include <iostream>
//#include <FK2008Sample2.h>

#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <FK2008Sample>
int myglobal;

void *thread_function(void *arg) {
int i,j;
for ( i=0; i<20; i++ ) {
j=myglobal;
j=j+1;
printf(".");
fflush(stdout);
sleep(1);
myglobal=j;
}
return NULL;
}

and then I created a .cpp file and pasted this in it:
using namespace std;

 c Syntax (Toggle Plain Text) 
int main(void) {
 
pthread_t mythread;
int i;
 
if ( pthread_create( &mythread, NULL, thread_function, NULL) ) {
printf("error creating thread.");
abort();
}
 
for ( i=0; i<20; i++) {
myglobal=myglobal+1;
printf("o");
fflush(stdout);
sleep(1);
}
 
if ( pthread_join ( mythread, NULL ) ) {
printf("error joining thread.");
abort();
}
 
printf("\nmyglobal equals %d\n",myglobal);
 
exit(0);
 
}
int main(void) {

pthread_t mythread;
int i;

if ( pthread_create( &mythread, NULL, thread_function, NULL) ) {
printf("error creating thread.");
abort();
}

for ( i=0; i<20; i++) {
myglobal=myglobal+1;
printf("o");
fflush(stdout);
sleep(1);
}

if ( pthread_join ( mythread, NULL ) ) {
printf("error joining thread.");
abort();
}

printf("\nmyglobal equals %d\n",myglobal);

exit(0);

}

But I am still getting errors: I know I am making a silly mistake that will probably take a second to change.

Thanks in advance

The Dark · May 5th, 2008, 6:57 PM

pthread.h is a posix (linux/unix) include file. It is not included in Visual C++. For threading under Visual C++, you would need to use something like the _beginthreadex function, which is in process.h. It might be easier to search for a different sample, rather than trying to convert this program to be compilable under Visual C++. There is a sample program here: http://simplesamples.info/Windows/_beginthreadex.php that I found using Google.

nannu · May 5th, 2008, 7:11 PM

Thank you very much Sir. I appreciate the help

BstrucT · May 7th, 2008, 8:09 AM

Just a little question guys...

Can the printf() function be used in C++ as well as in C?
Or is only 'cout' allowed in C++?

This is probably a dumb question but I know a lot of C syntax can be used in C++.

The Dark · May 7th, 2008, 8:23 AM

Yes, you can use printf in c++.

Alias · May 7th, 2008, 8:36 AM

Why mix C and C++? That's just unprofessional, not to mention ugly.

BstrucT · May 8th, 2008, 12:11 AM

Thanks Alias, wasn't planning on mixing the two though, just wanted to know wether some of C syntax could be compatible with C++.
But thanks for the heads up man.

I started out with C, then did some Visual C#, and am now just familiarizing myself a bit with C++ syntax as most seems to be more or less the same as C, but I guess that will all change once I reach the OOP section of the tutorials I am busy with.
Oooh, and pointers.

May 5th, 2008, 5:56 PM	#1
nannu Newbie Join Date: Apr 2008 Posts: 19 Rep Power: 0	Setting up Fairly new to programming. Any advice would be appreciated. Thanks in advance OK, I am using Microsoft Visual C++ for all of my C++ programming. We have done some very basic code just to get an overview of what is going on. I have found some code below, this code is pretty long compared to what we have done as we skimmed over the programs. But in MS Visual C++ how would I put this into the program. THREADS: c Syntax (Toggle Plain Text) #include <pthread.h> #include <stdlib.h> #include <unistd.h> #include <stdio.h> int myglobal; void thread_function(void arg) { int i,j; for ( i=0; i<20; i++ ) { j=myglobal; j=j+1; printf("."); fflush(stdout); sleep(1); myglobal=j; } return NULL; } int main(void) { pthread_t mythread; int i; if ( pthread_create( &mythread, NULL, thread_function, NULL) ) { printf("error creating thread."); abort(); } for ( i=0; i<20; i++) { myglobal=myglobal+1; printf("o"); fflush(stdout); sleep(1); } if ( pthread_join ( mythread, NULL ) ) { printf("error joining thread."); abort(); } printf("\nmyglobal equals %d\n",myglobal); exit(0); } #include <pthread.h> #include <stdlib.h> #include <unistd.h> #include <stdio.h> int myglobal; void thread_function(void arg) { int i,j; for ( i=0; i<20; i++ ) { j=myglobal; j=j+1; printf("."); fflush(stdout); sleep(1); myglobal=j; } return NULL; } int main(void) { pthread_t mythread; int i; if ( pthread_create( &mythread, NULL, thread_function, NULL) ) { printf("error creating thread."); abort(); } for ( i=0; i<20; i++) { myglobal=myglobal+1; printf("o"); fflush(stdout); sleep(1); } if ( pthread_join ( mythread, NULL ) ) { printf("error joining thread."); abort(); } printf("\nmyglobal equals %d\n",myglobal); exit(0); } OK what I am doing is when I open up the project I create the work space and give it a name. Now when I copy this code into the project and click compile, I get 1 error saying "Cannot open include file: 'pthread.h': No such file or directory". Now I know that in C++ you can have are .cpp file and a .h file. Now how can I prevent this from happening. I tried changing it up a little. I created a header file and pasted this part in it: c Syntax (Toggle Plain Text) #include <iostream> //#include <FK2008Sample2.h> #include <pthread.h> #include <stdlib.h> #include <unistd.h> #include <stdio.h> #include <FK2008Sample> int myglobal; void thread_function(void arg) { int i,j; for ( i=0; i<20; i++ ) { j=myglobal; j=j+1; printf("."); fflush(stdout); sleep(1); myglobal=j; } return NULL; } #include <iostream> //#include <FK2008Sample2.h> #include <pthread.h> #include <stdlib.h> #include <unistd.h> #include <stdio.h> #include <FK2008Sample> int myglobal; void thread_function(void arg) { int i,j; for ( i=0; i<20; i++ ) { j=myglobal; j=j+1; printf("."); fflush(stdout); sleep(1); myglobal=j; } return NULL; } and then I created a .cpp file and pasted this in it: using namespace std; c Syntax (Toggle Plain Text) int main(void) { pthread_t mythread; int i; if ( pthread_create( &mythread, NULL, thread_function, NULL) ) { printf("error creating thread."); abort(); } for ( i=0; i<20; i++) { myglobal=myglobal+1; printf("o"); fflush(stdout); sleep(1); } if ( pthread_join ( mythread, NULL ) ) { printf("error joining thread."); abort(); } printf("\nmyglobal equals %d\n",myglobal); exit(0); } int main(void) { pthread_t mythread; int i; if ( pthread_create( &mythread, NULL, thread_function, NULL) ) { printf("error creating thread."); abort(); } for ( i=0; i<20; i++) { myglobal=myglobal+1; printf("o"); fflush(stdout); sleep(1); } if ( pthread_join ( mythread, NULL ) ) { printf("error joining thread."); abort(); } printf("\nmyglobal equals %d\n",myglobal); exit(0); } But I am still getting errors: I know I am making a silly mistake that will probably take a second to change. Thanks in advance Last edited by Ancient Dragon; May 5th, 2008 at 8:15 PM. Reason: add code tags

May 5th, 2008, 6:57 PM	#2
The Dark Expert Programmer Join Date: Jun 2005 Posts: 810 Rep Power: 4	Re: Setting up pthread.h is a posix (linux/unix) include file. It is not included in Visual C++. For threading under Visual C++, you would need to use something like the _beginthreadex function, which is in process.h. It might be easier to search for a different sample, rather than trying to convert this program to be compilable under Visual C++. There is a sample program here: http://simplesamples.info/Windows/_beginthreadex.php that I found using Google.

May 5th, 2008, 7:11 PM	#3
nannu Newbie Join Date: Apr 2008 Posts: 19 Rep Power: 0	Re: Setting up Thank you very much Sir. I appreciate the help

May 7th, 2008, 8:09 AM	#4
BstrucT Hobbyist Programmer Join Date: Dec 2007 Location: Durban, South-Africa Posts: 118 Rep Power: 1	Re: Setting up Just a little question guys... Can the printf() function be used in C++ as well as in C? Or is only 'cout' allowed in C++? This is probably a dumb question but I know a lot of C syntax can be used in C++. __________________ >BstrucT

May 7th, 2008, 8:23 AM	#5
The Dark Expert Programmer Join Date: Jun 2005 Posts: 810 Rep Power: 4	Re: Setting up Yes, you can use printf in c++.

May 7th, 2008, 8:36 AM	#6
Alias Newbie Join Date: Oct 2007 Posts: 29 Rep Power: 0	Re: Setting up Why mix C and C++? That's just unprofessional, not to mention ugly.

May 8th, 2008, 12:11 AM	#7
BstrucT Hobbyist Programmer Join Date: Dec 2007 Location: Durban, South-Africa Posts: 118 Rep Power: 1	Re: Setting up Thanks Alias, wasn't planning on mixing the two though, just wanted to know wether some of C syntax could be compatible with C++. But thanks for the heads up man. I started out with C, then did some Visual C#, and am now just familiarizing myself a bit with C++ syntax as most seems to be more or less the same as C, but I guess that will all change once I reach the OOP section of the tutorials I am busy with. Oooh, and pointers. __________________ >BstrucT

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Programming Forums > Application Development > C

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