source: doc/theses/colby_parsons_MMAth/benchmarks/mutex_stmt/cfa/rand.cfa @ 21f4dff

#include <locks.hfa>
#include <mutex_stmt.hfa>
#include <stdio.h>
#include <stdlib.h>

#include "../bench.h"

test_spinlock LOCKS;

test_spinlock ** lock_arr;

inline void locks( size_t * arr ) {
    if (num_locks == 2) {
        mutex( *lock_arr[arr[0]], *lock_arr[arr[1]] ) {}
    } else if (num_locks == 4) {
        mutex( *lock_arr[arr[0]], *lock_arr[arr[1]], *lock_arr[arr[2]], *lock_arr[arr[3]] ) {}
    } else if (num_locks == 8) {
        mutex( *lock_arr[arr[0]], *lock_arr[arr[1]], *lock_arr[arr[2]], *lock_arr[arr[3]], *lock_arr[arr[4]], *lock_arr[arr[5]], *lock_arr[arr[6]], *lock_arr[arr[7]] ) {}
    }
}

bool done = false;
uint64_t total = 0;
size_t num_gen = 100; // number of rand orderings per thd
size_t ** rand_arrs;

// generate repeatable orderings for each experiment
void gen_orders() {
    rand_arrs = aalloc( threads );
    for ( i; threads )
        rand_arrs[i] = aalloc( num_locks * num_gen );

    size_t work_arr[num_locks];

    for ( i; num_locks )
        work_arr[i] = i;

    size_t curr_idx;
    for ( i; threads ) {
        state = i;
        curr_idx = 0;
        for ( j; num_gen ) {
            for ( size_t k = num_locks; k > 0; k-- ) {
                size_t rand_idx = next_int() % k; // choose one of remaining elems in work_arr
                rand_arrs[i][curr_idx] = work_arr[rand_idx];
                curr_idx++;

                // swap chosen elem to end so it isn't picked again
                size_t temp = work_arr[rand_idx];
                work_arr[rand_idx] = work_arr[k - 1];
                work_arr[k - 1] = temp;
            }
        }
        
    }
}

thread worker { size_t * my_arr; };
static inline void ?{}( worker & this, cluster & clu, size_t id ) {
    ((thread &)this){ clu };
    this.my_arr = rand_arrs[id];
}

void main( worker & w ) with(w) {
    uint64_t count = 0;
    while (true) {
        locks( my_arr + (count % num_gen) * num_locks ); // go to start of next sequence of locks
        count++;
        if (done) break;
    }
    __atomic_add_fetch(&total, count, __ATOMIC_SEQ_CST);
}
    
int main( int argc, char * argv[] ) {
        BENCH_START()
    if ( num_locks == -1 ) { printf("must pass # of locks to program!\n"); exit( EXIT_FAILURE ); }
    cluster clus;
    processor * proc[threads];
    for ( i; threads ) // create procs
        (*(proc[i] = alloc())){clus};

    lock_arr = aalloc( num_locks );

    if (num_locks >= 2) {
        lock_arr[0] = &l1; lock_arr[1] = &l2;
    }
    if (num_locks >= 4) {
        lock_arr[2] = &l3; lock_arr[3] = &l4;
    }
    if (num_locks == 8) {
        lock_arr[4] = &l5; lock_arr[5] = &l6; lock_arr[6] = &l7; lock_arr[7] = &l8;
    }

    gen_orders();

    worker * w[threads];
    for ( i; threads ) // create threads
        (*(w[i] = alloc())){ clus, i };
    
    sleep( 10`s );
    done = true;

    for ( i; threads ) // delete threads
        delete(w[i]);

    for ( i; threads ) // delete procs
        delete(proc[i]);

    for ( i; threads )
        adelete(rand_arrs[i]);
    adelete(rand_arrs);

    adelete(lock_arr);
    
        printf( "%lu\n", total );
}

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