How to pass parameters to the thread functions beginthread and pthread_create

1. Pass a single parameter: directly pass the pointer to the parameter.

/* ----------------------- Beginthread. c ----------------------------*/
# Include <process. h>

Void doubleNum (void * arg)
{
Int * arg = (int *) arg;
* Arg = (* arg) * 2;
}
Void main ()
{
Int arg = 0;
_ Beginthread (doubleNum, 0, (void *) & arg );
}
/* ----------------------- Pthread_create.c ----------------------------*/
# Include <pthread. h>

Void doubleNum (void * arg)
{
Int * arg = (int *) arg;
* Arg = (* arg) * 2;
}
Void main ()
{
Int arg = 0;
Pthread_t thread;
Pthread_create (& thread, 0, doubleNum, (void *) & arg );
Pthread_join (thread, NULL );
}

2. Pass multiple parameters: Define a struct containing all parameters and pass a pointer to the struct.

 

/* ----------------------- StructAndFunc. h ----------------------------*/

# Include <stdio. h>
Struct threadparam
{
Int * arg1;
Char [5] arg2;
}
Void doubleNum (void * arg)
{
Int * arg1 = (threadparam *) arg-> arg1;
Char * arg2 = (threadparam *) arg-> arg2;
Printf ("integer: % d char array: % s \ n", * arg1, arg2 );
}

/* ----------------------- Beginthread. c ----------------------------*/
# Include <process. h>
# Include <StructAndFunc. h>
Void main ()
{
Int integer = 5;
Char [5] array = {a, B, c, d, e };
Threadparam * param = new threadparam ();
Param-> arg1 = & interger;
Param-> arg2 = array;
HANDLE m_hThread = (HANDLE) _ beginthread (doubleNum, 0, (void *) threadparam );
}
/* ----------------------- Pthread_create.c ----------------------------*/
# Include <pthread. h>
# Include <StructAndFunc. h>
Void main ()
{
Int integer = 5;
Char [5] array = {a, B, c, d, e };
Threadparam * param = new threadparam ();
Param-> arg1 = & interger;
Param-> arg2 = array;
Pthread_t thread;
Pthread_create (& thread, 0, doubleNum, (void *) param );
Pthread_join (thread, NULL );
}
Ps. The above code is not tested, and some minor syntax errors may exist.