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Full Discussion: Threads help
Top Forums Programming Threads help Post 302316547 by smurf2 on Friday 15th of May 2009 11:28:49 AM
Old 05-15-2009
Threads help

Hello! I started studying studying about POSIX Threads a few days ago... so I am a little confused and I would appreciate some help!

I isolated this code... and I wonder if I could use threads in it!

Code:
#include <unistd.h>
#endif

#include <math.h>
//#include "main.h"
#include <sys/time.h>
#include <time.h>


#define TEMPRANGE 100.0
#define ROOMTEMP 0.0

volatile double ***before;
volatile double ***after;

// x-axis
const int cols = 240;
// y-axis
const int rows = 80;
// z-axis
const int faces = 8;


int main(int argc, char** argv){

  char buffer[30];
  struct timeval tv;
  time_t curtime;

  gettimeofday(&tv, NULL); 
  curtime=tv.tv_sec;

  strftime(buffer,30,"%m-%d-%Y  %T.",localtime(&curtime));
  printf("%s%ld\n",buffer,tv.tv_usec);

    int i, j, k;
    before = (volatile double ***) malloc((cols + 2) * sizeof(double **));
    after = (volatile double ***) malloc((cols + 2) * sizeof(double **));

    for(i = 0; i < cols + 2; i++){
        before[i] = (volatile double **) malloc((rows + 2) * sizeof(double *));
        after[i] = (volatile double **) malloc((rows + 2) * sizeof(double *));
    }

    for(i = 0; i < cols + 2; i++){
        for(j = 0; j < rows + 2; j++){
            before[i][j] = (volatile double *) malloc((faces + 2) * sizeof(double));
            after[i][j] = (volatile double *) malloc((faces + 2) * sizeof(double));
        }
    }

    for(i = 0; i < cols + 2; i++){
        for(j = 0; j < rows + 2; j++){
            for(k = 0; k < faces + 2; k++){
                before[i][j][k] = ROOMTEMP;
                after[i][j][k] = ROOMTEMP;
            }
        }
    }

    char buffer1[30];
  time_t curtime1;
  gettimeofday(&tv, NULL); 
  curtime1=tv.tv_sec;

  strftime(buffer1,30,"%m-%d-%Y  %T.",localtime(&curtime1));
  printf("%s%ld\n",buffer1,tv.tv_usec);

}

I was thinking of putting the three for loops in 3 different threads and keep in the main the other code and use pthread_join in main for each one of the 3 threads. I hope you understand my way of thinking... Am I thinking right?
Thank you in advance!
 

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Portable Threads Abstraction Classes(3)                                Coin                                Portable Threads Abstraction Classes(3)

NAME
Portable Threads Abstraction Classes - Classes class SbBarrier The SbBarrier class implements the 'barrier' multi-thread synchronization technique. A barrier is a synchronization mechanism that is used for blocking threads as they enter the barrier until a given number of threads are blocked, at which point all the threads are released again. " class SbCondVar A class for synchronizing access to global variables. Condition variables are used to protect global variables in an environment where multiple threads are running concurrently. " class SbFifo A class for managing a pointer first-in, first-out queue. class SbMutex A basic class for managing a mutex. This class provides a portable framework around the mutex interface of the underlying native thread-handling toolkit. " class SbThreadAutoLock Simple convenience class for locking access to a function. This class provides a simple convenience mechanism for automatically locking access to a function that is not re-entrant. " class SbRWMutex class SbStorage The SbStorage class manages thread-local memory. This class manages thread-local memory. When different threads access the memory an SbStorage object manages, they will receive different memory blocks back. " class SbTypedStorage< Type > The SbTypedStorage class manages generic thread-local memory. This class manages thread-local memory. When different threads access the memory an SbTypedStorage object manages, they will receive different memory blocks back. " class SbThread A class for managing threads. This class provides a portable framework around the tasks of instantiating, starting, stopping and joining threads. " Detailed Description Coin implements a set of abstractions over the native threads data types that can be portably used across all the platforms Coin has been ported to. Author Generated automatically by Doxygen for Coin from the source code. Version 3.1.3 Wed May 23 2012 Portable Threads Abstraction Classes(3)
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