Multithreading using pthread in C++ with shared variables
- by Saviour Self
I'm new to threading (and C/C++ for that matter), and I'm attempting to use multiple threads to access shared variables.
In the main, I've created a variable char inputarray[100];
Thread 1: This thread will be reading data from stdin in 2 byte bursts, and appending them to the inputarray. (input by feeding a file in)
Thread 2: This thread will be reading data 1 byte at a time, performing a calculation, and putting its data into an output array.
Thread 3: This thread will be outputting data from the output array in 2 byte bursts. (stdout)
I've attempted the input part and got it working by passing a struct, but would like to do it without using a struct, but it has been giving me problems.
If I can get input down, I'm sure I'll be able to use a similar strategy to complete output. Any help would be greatly appreciated.
Below is a rough template for the input thread.
#include <stdio.h>
#include <pthread.h>
using namespace std;
void* input(void* arg) {
char reading[3];
fread(reading,1,2,stdin);
//append to char inputarray[]..???
}
int main() {
char inputarray[100];
pthread_t t1;
pthread_create(&t1, NULL, &input, &inputarray);
void *result;
pthread_join(t1,&result);
return 0;
}
