/* -*- mode: C; c-basic-offset: 4 -*- */

/* verify that get_and_pin waits while a prefetch block is pending */
#include "includes.h"
#include "test.h"

static void
flush (CACHEFILE f __attribute__((__unused__)),
       CACHEKEY k  __attribute__((__unused__)),
       void *v     __attribute__((__unused__)),
       void *e     __attribute__((__unused__)),
       long s      __attribute__((__unused__)),
       BOOL w      __attribute__((__unused__)),
       BOOL keep   __attribute__((__unused__)),
       BOOL c      __attribute__((__unused__))
       ) {
    assert(w == FALSE);
}

static int
fetch (CACHEFILE f        __attribute__((__unused__)),
       CACHEKEY k         __attribute__((__unused__)),
       u_int32_t fullhash __attribute__((__unused__)),
       void **value       __attribute__((__unused__)),
       long *sizep        __attribute__((__unused__)),
       void *extraargs    __attribute__((__unused__))
       ) {

    sleep(10);

    *value = 0;
    *sizep = 1;

    return 0;
}

static uint64_t tdelta_usec(struct timeval *tend, struct timeval *tstart) {
    uint64_t t = tend->tv_sec * 1000000 + tend->tv_usec;
    t -= tstart->tv_sec * 1000000 + tstart->tv_usec;
    return t;
}

static void cachetable_prefetch_maybegetandpin_test (void) {
    const int test_limit = 1;
    int r;
    CACHETABLE ct;
    r = toku_create_cachetable(&ct, test_limit, ZERO_LSN, NULL_LOGGER); assert(r == 0);
    char fname1[] = __FILE__ "test1.dat";
    unlink(fname1);
    CACHEFILE f1;
    r = toku_cachetable_openf(&f1, ct, fname1, fname1, O_RDWR|O_CREAT, S_IRWXU|S_IRWXG|S_IRWXO); assert(r == 0);

    struct timeval tstart;
    gettimeofday(&tstart, NULL);

    // prefetch block 0. this will take 10 seconds.
    CACHEKEY key = make_blocknum(0);
    u_int32_t fullhash = toku_cachetable_hash(f1, make_blocknum(0));
    r = toku_cachefile_prefetch(f1, key, fullhash, flush, fetch, 0);
    toku_cachetable_verify(ct);

    // verify that get_and_pin waits while the prefetch is in progress
    void *v = 0;
    long size = 0;
    r = toku_cachetable_get_and_pin(f1, key, fullhash, &v, &size, flush, fetch, NULL);
    assert(r == 0 && v == 0 && size == 1);

    struct timeval tend; 
    gettimeofday(&tend, NULL);

    assert(tdelta_usec(&tend, &tstart) >= 10000000); 
    
    toku_cachetable_verify(ct);

    r = toku_cachetable_unpin(f1, key, fullhash, CACHETABLE_CLEAN, 1);
    assert(r == 0);
    toku_cachetable_verify(ct);

    r = toku_cachefile_close(&f1, 0, FALSE, ZERO_LSN); assert(r == 0 && f1 == 0);
    r = toku_cachetable_close(&ct); assert(r == 0 && ct == 0);
}

int
test_main(int argc, const char *argv[]) {
    default_parse_args(argc, argv);
    cachetable_prefetch_maybegetandpin_test();
    return 0;
}