#ident "$Id: cachetable-simple-verify.c 34757 2011-09-14 19:12:42Z leifwalsh $"
#ident "Copyright (c) 2007-2011 Tokutek Inc.  All rights reserved."
#include "includes.h"
#include "test.h"

CACHETABLE ct;

//
// This test exposed a bug (#3970) caught only by Valgrind.
// freed memory was being accessed by toku_cachetable_unpin_and_remove
//

static void
flush (CACHEFILE f __attribute__((__unused__)),
       int UU(fd),
       CACHEKEY k  __attribute__((__unused__)),
       void *v     __attribute__((__unused__)),
       void *e     __attribute__((__unused__)),
       long s      __attribute__((__unused__)),
       long* new_size      __attribute__((__unused__)),
       BOOL w      __attribute__((__unused__)),
       BOOL keep   __attribute__((__unused__)),
       BOOL c      __attribute__((__unused__))
       ) {
}

static int
fetch (CACHEFILE f        __attribute__((__unused__)),
       int UU(fd),
       CACHEKEY k         __attribute__((__unused__)),
       u_int32_t fullhash __attribute__((__unused__)),
       void **value       __attribute__((__unused__)),
       long *sizep        __attribute__((__unused__)),
       int  *dirtyp,
       void *extraargs    __attribute__((__unused__))
       ) {
  *dirtyp = 0;
  *value = NULL;
  *sizep = 8;
  return 0;
}

static void 
pe_est_callback(
    void* UU(brtnode_pv), 
    long* bytes_freed_estimate, 
    enum partial_eviction_cost *cost, 
    void* UU(write_extraargs)
    )
{
    *bytes_freed_estimate = 0;
    *cost = PE_CHEAP;
}

static int 
pe_callback (
    void *brtnode_pv __attribute__((__unused__)), 
    long bytes_to_free __attribute__((__unused__)), 
    long* bytes_freed, 
    void* extraargs __attribute__((__unused__))
    ) 
{
    *bytes_freed = bytes_to_free;
    return 0;
}

static BOOL pf_req_callback(void* UU(brtnode_pv), void* UU(read_extraargs)) {
  return FALSE;
}

static int pf_callback(void* UU(brtnode_pv), void* UU(read_extraargs), int UU(fd), long* UU(sizep)) {
  assert(FALSE);
}


CACHEFILE f1;

static void
unlock_test_fun (void *v) {
    assert(v == NULL);
    // CT lock is held
    int r = toku_cachetable_unpin_ct_prelocked_no_flush(f1, make_blocknum(2), 2, CACHETABLE_CLEAN, 100);
    assert(r==0);
}

static void fake_ydb_lock(void) {
}

static void fake_ydb_unlock(void) {
}


static void
run_test (void) {
    const int test_limit = 20;
    int r;
    ct = NULL;
    r = toku_create_cachetable(&ct, test_limit, ZERO_LSN, NULL_LOGGER); assert(r == 0);
    char fname1[] = __FILE__ "test1.dat";
    unlink(fname1);
    f1 = NULL;
    r = toku_cachetable_openf(&f1, ct, fname1, O_RDWR|O_CREAT, S_IRWXU|S_IRWXG|S_IRWXO); assert(r == 0);
    
    void* v1;
    void* v2;
    long s1;
    long s2;
    
    r = toku_cachetable_get_and_pin(f1, make_blocknum(1), 1, &v1, &s1, flush, fetch, pe_est_callback, pe_callback, pf_req_callback, pf_callback, NULL, NULL);
    r = toku_cachetable_unpin(f1, make_blocknum(1), 1, CACHETABLE_CLEAN, 8); assert(r==0);

    for (int i = 0; i < 20; i++) {
        r = toku_cachetable_get_and_pin(f1, make_blocknum(2), 2, &v2, &s2, flush, fetch, pe_est_callback, pe_callback, pf_req_callback, pf_callback, NULL, NULL);
        r = toku_cachetable_unpin(f1, make_blocknum(2), 2, CACHETABLE_CLEAN, 8); assert(r==0);
    }

    //
    // so at this point, we have 16 bytes in the cachetable that has a limit of 20 bytes
    // block 2 has been touched much more than block 1, so if one had to be evicted,
    // it would be block 2
    //


    // pin 1 and 2
    r = toku_cachetable_get_and_pin(f1, make_blocknum(1), 1, &v2, &s2, flush, fetch, pe_est_callback, pe_callback, pf_req_callback, pf_callback, NULL, NULL);
    r = toku_cachetable_begin_checkpoint(ct, NULL);
    // mark nodes as pending a checkpoint, so that get_and_pin_nonblocking on block 1 will return TOKUDB_TRY_AGAIN
    r = toku_cachetable_unpin(f1, make_blocknum(1), 1, CACHETABLE_CLEAN, 8); assert(r==0);

    r = toku_cachetable_get_and_pin(f1, make_blocknum(2), 2, &v2, &s2, flush, fetch, pe_est_callback, pe_callback, pf_req_callback, pf_callback, NULL, NULL);
    // now we try to pin 1, and it should get evicted out from under us
    struct unlockers foo;
    foo.extra = NULL;
    foo.locked = TRUE;
    foo.f = unlock_test_fun;
    foo.next = NULL;
    r = toku_cachetable_get_and_pin_nonblocking(
        f1,
        make_blocknum(1),
        1,
        &v1,
        &s1,
        flush,
        fetch,
        pe_est_callback,
        pe_callback,
        pf_req_callback,
        pf_callback,
        NULL,
        NULL,
        &foo
        );
    assert(r==TOKUDB_TRY_AGAIN);
    
    r = toku_cachetable_end_checkpoint(
        ct, 
        NULL, 
        fake_ydb_lock,
        fake_ydb_unlock,
        NULL,
        NULL
        );
    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); lazy_assert_zero(r);
    
    
}

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