/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id: cachetable-simple-verify.cc 52748 2013-01-31 21:12:42Z leifwalsh $"
#ident "Copyright (c) 2007-2012 Tokutek Inc.  All rights reserved."

#include "test.h"



//
// This test verifies that if a node is pinned by a thread
// doing get_and_pin_nonblocking while another thread is trying
// to unpin_and_remove it, that nothing bad happens.
//

CACHEFILE f1;
PAIR p1;
PAIR p2;


static int
fetch_one(CACHEFILE f        __attribute__((__unused__)),
       PAIR UU(p),
       int UU(fd),
       CACHEKEY k         __attribute__((__unused__)),
       uint32_t fullhash __attribute__((__unused__)),
       void **value       __attribute__((__unused__)),
       void **dd     __attribute__((__unused__)),
       PAIR_ATTR *sizep        __attribute__((__unused__)),
       int  *dirtyp,
       void *extraargs    __attribute__((__unused__))
       ) {
    *dirtyp = 0;
    *value = NULL;
    *sizep = make_pair_attr(8);
    assert(k.b == 1);
    p1 = p;
    return 0;
}

static int
fetch_two (CACHEFILE f        __attribute__((__unused__)),
       PAIR UU(p),
       int UU(fd),
       CACHEKEY k         __attribute__((__unused__)),
       uint32_t fullhash __attribute__((__unused__)),
       void **value       __attribute__((__unused__)),
       void **dd     __attribute__((__unused__)),
       PAIR_ATTR *sizep        __attribute__((__unused__)),
       int  *dirtyp,
       void *extraargs    __attribute__((__unused__))
       ) {
    *dirtyp = 0;
    *value = NULL;
    *sizep = make_pair_attr(8);
    assert(k.b == 2);
    p2 = p;
    return 0;
}

toku_pthread_t unpin_and_remove_tid;

static void *unpin_and_remove_one(void *UU(arg)) {
    int r = toku_cachetable_unpin_and_remove(
        f1, 
        p1, 
        NULL, 
        NULL
        );
    assert_zero(r);
    return arg;
}

static void
unpin_two (void* UU(v)) {
    int r = toku_cachetable_unpin_ct_prelocked_no_flush(
        f1,
        p2,
        CACHETABLE_DIRTY,
        make_pair_attr(8)
        );
    assert_zero(r);

    // at this point, we have p1 pinned, want to start a thread to do an unpin_and_remove
    // on p1    
    r = toku_pthread_create(
        &unpin_and_remove_tid, 
        NULL, 
        unpin_and_remove_one, 
        NULL
        ); 
    assert_zero(r);
    // sleep to give a chance for the unpin_and_remove to get going
    usleep(512*1024);
}

static void *repin_one(void *UU(arg)) {
    CACHETABLE_WRITE_CALLBACK wc = def_write_callback(NULL);
    struct unlockers unlockers = {true, unpin_two, NULL, NULL};
    void* v1;
    long s1;
    int r = toku_cachetable_get_and_pin_nonblocking(
        f1,
        make_blocknum(1),
        1,
        &v1,
        &s1,
        wc,
        def_fetch,
        def_pf_req_callback,
        def_pf_callback,
        PL_WRITE_EXPENSIVE,
        NULL,
        &unlockers
        );
    assert(r == TOKUDB_TRY_AGAIN);
    return arg;
}



static void
cachetable_test (void) {
    const int test_limit = 1000;
    int r;
    toku_pair_list_set_lock_size(2); // set two bucket mutexes
    CACHETABLE ct;
    toku_cachetable_create(&ct, test_limit, ZERO_LSN, NULL_LOGGER);
    const char *fname1 = TOKU_TEST_FILENAME;
    unlink(fname1);
    r = toku_cachetable_openf(&f1, ct, fname1, O_RDWR|O_CREAT, S_IRWXU|S_IRWXG|S_IRWXO); assert(r == 0);

    void* v1;
    long s1;
    CACHETABLE_WRITE_CALLBACK wc = def_write_callback(NULL);

    // bring pairs 1 and 2 into memory, then unpin
    r = toku_cachetable_get_and_pin(f1, make_blocknum(1), 1, &v1, &s1, wc, fetch_one, def_pf_req_callback, def_pf_callback, true, NULL);
    assert_zero(r);
    r = toku_cachetable_get_and_pin(f1, make_blocknum(2), 2, &v1, &s1, wc, fetch_two, def_pf_req_callback, def_pf_callback, true, NULL);
    assert_zero(r);


    toku_pthread_t tid1;
    r = toku_pthread_create(&tid1, NULL, repin_one, NULL); 
    assert_zero(r);

    void *ret;
    r = toku_pthread_join(tid1, &ret); 
    assert_zero(r);
    r = toku_pthread_join(unpin_and_remove_tid, &ret); 
    assert_zero(r);

    toku_cachetable_verify(ct);
    toku_cachefile_close(&f1, false, ZERO_LSN);
    toku_cachetable_close(&ct);
}

int
test_main(int argc, const char *argv[]) {
    default_parse_args(argc, argv);
    // test ought to run bunch of times in hope of hitting bug
    uint32_t num_test_runs = 1;
    for (uint32_t i = 0; i < num_test_runs; i++) {
        if (verbose) {
            printf("starting test run %" PRIu32 " \n", i);
        }
        cachetable_test();
    }
    return 0;
}