Vraag6

/**

 * Implementation of test cases using atomic and non-atomic cmpxchg.

 *

 * Author: Andreas Sandberg

 *

 */



#include "lab3.h"



#include "lab3_asm.h"



static volatile int32_t x = 0;



static void

increase(int thread, int iterations, volatile int *data)

{

	int i;

	for (i = 0;  i< iterations; i++){

		while(asm_cmpxchg_int32((int32_t*)&x, 0, 1));

		asm_inc_int32((int32_t*)data);

		x=0;

	}

        /* TASK: Implement a loop that increments *data by 1 using

         * non-atomic compare and exchange instructions. See lab3_asm.h.

         */

}



static void

decrease(int thread, int iterations, volatile int *data)

{

	int i;

	for(i = 0; i < iterations ; i++){

		while(asm_cmpxchg_int32((int32_t*)&x, 0, 1));

		asm_dec_int32((int32_t*)data);

		x=0;

	}



        /* TASK: Implement a loop that decrements *data by 1 using

         * non-atomic compare and exchange instructions. See lab3_asm.h.

         */

}





static void

increase_atomic(int thread, int iterations, volatile int *data)

{

	int i;

	for (i = 0;  i< iterations; i++){

		while(asm_atomic_cmpxchg_int32((int32_t*)&x, 0, 1));

		asm_atomic_inc_int32((int32_t*)data);

		x=0;

	}



        /* TASK: Implement a loop that increments *data by 1 using

         * atomic compare and exchange instructions. See lab3_asm.h.

         */

}



static void

decrease_atomic(int thread, int iterations, volatile int *data)

{

	int i;

	for (i = 0;  i< iterations; i++){

		while(asm_atomic_cmpxchg_int32((int32_t*)&x, 0, 1));

		asm_atomic_inc_int32((int32_t*)data);

		x=0;

	}

        /* TASK: Implement a loop that decrements *data by 1 using

         * atomic compare and exchange instructions. See lab3_asm.h.

         */

}



test_impl_t test_impl_cmpxchg_no_atomic = {

        .name = "cmpxchg_no_atomic",

        .desc = "Modify a shared variable using compare and exchange",



        .num_threads = 2,

        .test = { &increase, &decrease }

};



test_impl_t test_impl_cmpxchg_atomic = {

        .name = "cmpxchg_atomic",

        .desc = "Modify a shared variable using atomic compare and exchange",



        .num_threads = 2,

        .test = { &increase_atomic, &decrease_atomic }

};



/*

 * Local Variables:

 * mode: c

 * c-basic-offset: 8

 * indent-tabs-mode: nil

 * c-file-style: "linux"

 * End:

 */