errors compiling c++

[jiggyup]

hi ,

i just installed ubuntu so i can learn more about programming
im currently trying to program in c++, using gedit and ive made sure that ive got both make and g++ installed

however when i try to compile a source file i get A LOT of errors, when i know the program is synatically correct. here is an example of some errors

/usr/include/c++/4.0.2/fstream:667: error: no type named ‘int_type’ in ‘struct std::char_traits<wchar_t>’
/usr/include/c++/4.0.2/fstream:669: error: no type named ‘off_type’ in ‘struct std::char_traits<wchar_t>’

what exactly is wrong here? any help appreciated

thanks

[toojays]

It would help if you posted the command which you are using to compile, as well as a small example of the code which can be used to reproduce this.

[jiggyup]

sure

im using this command to compile

g++ lab3.cpp -o lab3 -lpthread

and in the code just trying to create threads
i didnt include the thread functions or header files

int main(int argc, char* argv[]) {
pthread_t server;

//initialize integer values numInputs, numAlive, max_cpu_queue
int numInputs = argc - 2;
numAlive = numInputs;
int max_cpu_queue = atoi(argv[1]);

//initialize array of threads, one per input file
pthread_t threads[numInputs];
cout << "threads initialized" << endl;

//initialize servicing thread and error checking
pthread_create(&server, NULL, service_function, NULL);
pthread_join(server,NULL);
cout << "servicer ready" << endl;

//create array for the threads using input files
for (int i=0; i<numInputs; i++) {
int st = pthread_create(&threads[i], NULL, thread_function, (void*)argv[i+2]);
pthread_join(threads[i],NULL);
if (st!=0)
printf("pthread_create failed with status: %d\n",st);
}
}

[LordHunter317]

Need to post the entire file.

[jiggyup]

sure, here's what ive got

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include <fstream>
using namespace std;

//prototype for thread and service functions
void* thread_function(void *arg);
void* service_function(void *arg);

//prototype for queue functions
void queue_function(void);
void swap(int& x, int& y);

//mutex intializer
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

//shared states
int numAlive; //number currently 'alive' threads
int queue[10]; //scheduling queue

int main(int argc, char* argv[]) {
pthread_t server;

//initialize integer values numInputs, numAlive, max_cpu_queue
int numInputs = argc - 2;
numAlive = numInputs;
int max_cpu_queue = atoi(argv[1]);

//initialize array of threads, one per input file
pthread_t threads[numInputs];
cout << "threads initialized" << endl;

//initialize servicing thread and error checking
pthread_create(&server, NULL, service_function, NULL);
pthread_join(server,NULL);
cout << "servicer ready" << endl;

//create array for the threads using input files
for (int i=0; i<numInputs; i++) {
int st = pthread_create(&threads[i], NULL, thread_function, (void*)argv[i+2]);
pthread_join(threads[i],NULL);
if (st!=0)
printf("pthread_create failed with status: %d\n",st);
}
}

void* thread_function(void* arg) {
//using input, open input file
//while not at the end of file, try to put job in queue by lockgin mutex then inserting number
//if job in queue, wait
//after eof, lock mutex decrement numAlive unlock
//exit
return NULL;
}

void* service_function(void* arg) {
//using minimum item, 'run' the job
return NULL;
}

[jiggyup]

my first errors that i get are

g++: o-: No such file or directory
g++: lab3: No such file or directory
lab3.cpp:1:21: error: pthread.h: No such file or directory
lab3.cpp:2:19: error: stdio.h: No such file or directory
lab3.cpp:3:20: error: stdlib.h: No such file or directory

followed up by, probably over 1000 more lines of errors of the form i specified in the first thread,

i've already tried reinstalling g++ and make,
what could be going wrong here?

[toojays]

Ah, you are missing the C library headers. Install the build-essential package, that will pull in everything you need.

[toojays]

By the way, the first two errors would only come up if you wrote "o-" instead of "-o" in your command line.

[jiggyup]

ahhi see

i ran the apt-get and now everything is working fine

thanks much