source: proiecte/swift/trunk/test/fibo_stack_2spawns.c @ 176

/*
 * swift_context.c
 *
 * (c) 2009 Ionut Rosoiu <ionut.rosoiu@gmail.com>
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include "swift.h"

int N;

typedef struct fibo_data {
        int n;
        int *r;
        // sync related
        swift_size_t sync_frames_remaining;
        char _pad[SWIFT_CACHE_LINE_SIZE - sizeof(swift_size_t)];
} fibo_data_t;

/* forward declaration for the fibo() */
void fibo(swift_thread_t *thread, swift_frame_t *frame);


/* void fibo(int r, shared_w int* r) */
void fibo(swift_thread_t *thread, swift_frame_t *frame) {
        fibo_data_t *data = frame->private_data;
        swift_status_t status;
        swift_size_t n;

        SWIFT_LOG_FRAME_INFO_STR("\nfibo() ", thread, frame);

        if (data->n < 2) {
                *data->r = data->n;
                data->sync_frames_remaining = 0;

        } else {
                // fibo(n-1) data
                swift_frame_t frame1;
                fibo_data_t data1;

                // fibo(n-2) data
                swift_frame_t frame2;
                fibo_data_t data2;

                int r1, r2;

                /* spawn fibo(n-1, r1); */
                frame1.closure = fibo;
                frame1.flags = 0;
#ifdef LOGGING_ON
                frame1.creator_id = thread->id;
                frame1.dbg = data->n - 1;
#endif
                data1.n = data->n - 1;
                data1.r = &r1;
                frame1.private_data = &data1;

                SWIFT_WRITE_FRAME_INFO((&frame1), thread->id, 'f', thread->frame_no++);
                // sync related
                frame1.dependencies_frame = NULL;
                frame1.sync_frames_remaining = &data->sync_frames_remaining;

                /* spawn fibo(n-2, r2); */
                frame2.closure = fibo;
                frame2.flags = 0;
#ifdef LOGGING_ON
                frame2.creator_id = thread->id;
                frame2.dbg = data->n - 2;
#endif

                data2.n = data->n - 2;
                data2.r = &r2;
                frame2.private_data = &data2;

                SWIFT_WRITE_FRAME_INFO((&frame2), thread->id, 'f', thread->frame_no++);
                frame2.dependencies_frame = NULL;
                frame2.sync_frames_remaining = &data->sync_frames_remaining;

                // wait for 1,2 to finish
                data->sync_frames_remaining = 2;

                // add 1 & 2 in the workque
                swift_deque_push(&thread->workque, &frame1, &status);
                swift_deque_push(&thread->workque, &frame2, &status);

                while ((n = SWIFT_ATOMIC_READ(data->sync_frames_remaining))) {
                        SWIFT_LOG(INFO, "[%d] %s rem=%d c=%d f=%c.%d (%d)\n", thread->id, "@sync", n,
                                                                          SWIFT_PROC(frame->info), SWIFT_FRAME_NAME(frame->info),
                                                                          frame->dbg, SWIFT_FRAME_ID(frame->info));
                        swift_scheduler_execute(thread);
                }

                *data->r = r1 + r2;
        }

        SWIFT_LOG(INFO, "[%d] __fibo(%d)=%d\n", thread->id, data->n, *data->r);

        if (SWIFT_FRAME_IS_END_PARALLEL(frame)) {
                SWIFT_LOG(INFO, "[%d] END_PARALLEL!!!\n", thread->id);
                thread->stop = 1;
        }

        swift_signal_frame_done(thread, frame);
        swift_frame_done(thread->context, thread, frame);
}

void* thread_start(void *arg) {
        swift_thread_t *thread = arg;
        int i = 0;

        SWIFT_LOG(INFO, "_____started thread %d\n", thread->id);

        //while (i++ <= N) {
                //swift_scheduler_execute(thread, &status);
        //}

        while(!thread->stop) {
                swift_scheduler_execute(thread);
        }

        // inform all other threads that they must stop
        for (i=0; i<thread->context->thread_num; i++) {
                thread->context->threads[i].stop = 1;
        }


        SWIFT_LOG(INFO, "_____finished thread %d: %d frames processed\n", thread->id, thread->stats);
        printf("_____finished thread %d: %d frames processed\n", thread->id, thread->stats);

        return arg;
}

int main(int argc, char **argv) {
        swift_context_t context;
        swift_frame_t *frame;
        swift_status_t status;
        fibo_data_t *data;
        int i, r;
        int nthreads, n;

        if (argc != 3) {
                fprintf(stderr, "usage: %s Nthreads N\n", argv[0]);
                abort();
        }

        nthreads = strtol(argv[1], NULL, 10);
        n = strtol(argv[2], NULL, 10);
        N = n;

        SWIFT_LOG(INFO, "Started nthreads=%d n=%d\n", nthreads, n);

        /* initialize the context */
        swift_context_init(&context, nthreads);

        /* push the first frame */
        frame = (swift_frame_t*) swift_malloc(&context.threads[0], sizeof(swift_frame_t) + sizeof(fibo_data_t));
        SWIFT_FRAME_SET_END_PARALLEL(frame);
        frame->closure = fibo;
#ifdef LOGGING_ON
        frame->dbg = n;
        frame->creator_id = 0;
#endif

        data = (fibo_data_t*) ((char*)frame + sizeof(swift_frame_t));
        data->n = n;
        data->r = &r;
        frame->private_data = data;

        SWIFT_WRITE_FRAME_INFO(frame, 0, 'f', context.threads[0].frame_no++);
        SWIFT_LOG_FRAME_INFO((&context.threads[0]), frame);

        // no wait frame
        frame->dependencies_no = 0;
        frame->dependencies_frame = NULL;
        frame->sync_frames_remaining = &data->sync_frames_remaining; // doesn't matter

        swift_deque_push(&context.threads[0].workque, frame, &status);
        SWIFT_LOG(INFO, "pushed first frame\n");


        /* start the threads */
        for (i=0; i<nthreads; i++) {
                swift_thread_start(&context.threads[i], thread_start);
        }

        /* wait for the threads to finish */
        for (i=0; i<nthreads; i++) {
                SWIFT_LOG(INFO, "_____waiting %d\n", i);
                swift_thread_wait(&context.threads[i]);
                SWIFT_LOG(INFO, "_____waiting %d done\n", i);
        }

        /* check the result */
        printf("computed result for fibo(%d)=%d\n", n, r);
        swift_context_destroy(&context);

        return 0;
}