hay try this cpp code to thread member functions!!!!!
as u know threads are called by simple calling a static function.
but member functions are restricted to the scope of an object as they access on variables within an object specific environment.
so one of the best way to do this is a JAVA style generic threading architecture- i hav provided a simple code here---njoy!!!!!
~~~~~~~~~~~~~~~~~~~~~
Code:
#include<iostream>
#include<pthread.h>
#include<sys/types.h>
using namespace std;
// this class is used to make generic calls to the run function
// in any object which have been inherited from object class
class Object
{
public:
virtual void run(){}
};
// now we will create an executer non member function
//which can call the run function of any Object class instance
void* executer(void* param)
{
Object *obj=(Object*)param;
obj->run();
// this will definitely call the run function associated with the object obj
// from this general function--the rest i guess u can figure out!
}
//now we will create the threading framework
class thread : public Object
{
pthread_t thid;
int ret;
public:
void start();
void join();
};
// this member function will call the run function of the derived class
void thread::start()
{
ret=pthread_create(&thid,NULL,executer,(void*)this);
}
// this is to join the object threads
void thread::join()
{
pthread_join(thid,NULL);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// thats all thats required for the basic one
// now we use the above code...
// if we have to call a member function of a class
// we inherit it from the class thread and call the derived calss object //start function
// the run function will get executed as a thread!!!! just as java does it
// note that only the run function is threadable here
// further modifications is up to u - this is only the base
// by the way i hav not provided nything for synchronisation-give it where
//required, alogo to pass arg to threads, calling functions other than the //run() etc....
// as an example of the above frame work we shall see a small example
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class multicount : public thread
{
char *name;
public:
multicount(char n[])
{
name=n;
}
void run();
};
void multicount::run()
{
for(int i=0;i<10000;i++)
{
cout<<"\n"<<name<<" : "<<i;
}
}
int main()
{
// we first create 3 instances(objects) of multicount a,b,c
multicount a("thread1"),b("thread2"),c("thread3");
// then we call the a.start() of object a to create a thread for doing
// a.run() and similarly for others
a.start();
b.start();
c.start();
// finally we wait for all threads to join
a.join();
b.join();
c.join();
//creating such frameworks greatly reduces programming difficulty with
// OOP
// see how eazy the thread operations became with the simple
//architecture
return 0;
}
Last edited by Franklin52; 12-27-2008 at 07:30 AM..
Reason: adding code tags
Here is simple code for multithreading in POSIX:
void* simplethread(void* arg)
{
printf("Hello World\n");
}
int main(void)
{
pthread_t id;
pthread_create(&id, NULL, simplethread, NULL);
return 0;
}
Whether the new thread will run or not depends on the OS. Tricky ... (5 Replies)
Hello
My problem goes like this:
I have used Pthread_create, and I have tryed to create 2 proccess but nothing happens! It does not even matter what the function im trying to create do. It is if im trying to activate an empty function. This is my code.
Any help will be highly appreciated.... (1 Reply)
Im trying to run an application i compiled (iperf) and i get an error telling me that it cant create the pthread. when i ran the ./configuration one of the things it checked was for pthreads which came back ok.
Im not really sure where to even start to resolve this. i have been unable to find... (5 Replies)
I try to compile a sample c code in fedora eclipse 3.2 as managed makefile using pthread library,it shows some error on pthread functions.Error is of undefined reference to pthread.Anybody guide me to solve this problem.
Thanking you (1 Reply)
Hi guys.
H was learning posix threads in C with anjuta IDE. it gives me
undefined reference to `pthread_create'
I know i should compile it like:
gcc -lpthread main.c
how should i import this configuration in anjuta so i can compile inside it? (2 Replies)
The prototype for pthread_create function is like this:-
int pthread_create(pthread_t *thread,pthread_attr_t *attr,void *(*start routine),void *arg);
Q.1 .Why the return type of the start_routine must be void*??
Q.2. Why should we pass arg by converting into void * only ??
Thank You (3 Replies)
Hi,
I'm trying to do my homework assignment but I am having trouble using the pthread_create fucntion.
Here is my code________________
//Alicia Johnson
//sum_pid program
//creates n number of threads. These threads create a random number
//then adds the number to a global array. Then... (1 Reply)
Suppose I have a simple program main() with a global varibale int x=0.
int x = 0;
main()
{
print("%d\n",x);
}
I want to create two threads/process which must access this variable x in sync.
Which one will be better threads( pthread_create ) or process( fork )?
If I go with fork() then... (1 Reply)
Discussion started by: rupeshkp728
1 Replies
LEARN ABOUT DEBIAN
threads
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)