/*-
 * Public Domain 2014-present MongoDB, Inc.
 * Public Domain 2008-2014 WiredTiger, Inc.
 *
 * This is free and unencumbered software released into the public domain.
 *
 * Anyone is free to copy, modify, publish, use, compile, sell, or
 * distribute this software, either in source code form or as a compiled
 * binary, for any purpose, commercial or non-commercial, and by any
 * means.
 *
 * In jurisdictions that recognize copyright laws, the author or authors
 * of this software dedicate any and all copyright interest in the
 * software to the public domain. We make this dedication for the benefit
 * of the public at large and to the detriment of our heirs and
 * successors. We intend this dedication to be an overt act of
 * relinquishment in perpetuity of all present and future rights to this
 * software under copyright law.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "thread.h"

static void print_stats(u_int);
static WT_THREAD_RET reader(void *);
static WT_THREAD_RET writer(void *);

typedef struct {
    char *name; /* object name */
    u_int nops; /* Thread op count */

    WT_RAND_STATE rnd; /* RNG */

    int remove; /* cursor.remove */
    int update; /* cursor.update */
    int reads;  /* cursor.search */
} INFO;

static INFO *run_info;

/*
 * rw_start --
 *     TODO: Add a comment describing this function.
 */
void
rw_start(u_int readers, u_int writers)
{
    struct timeval start, stop;
    wt_thread_t *tids;
    double seconds;
    u_int i, name_index, offset, total_nops;

    tids = NULL; /* Keep GCC 4.1 happy. */
    total_nops = 0;

    /* Create per-thread structures. */
    run_info = dcalloc((size_t)(readers + writers), sizeof(*run_info));
    tids = dcalloc((size_t)(readers + writers), sizeof(*tids));

    /* Create the files and load the initial records. */
    for (i = 0; i < writers; ++i) {
        if (i == 0 || multiple_files) {
            run_info[i].name = dmalloc(64);
            testutil_check(__wt_snprintf(run_info[i].name, 64, FNAME, (int)i));

            /* Vary by orders of magnitude */
            if (vary_nops)
                run_info[i].nops = WT_MAX(1000, max_nops >> i);
            load(run_info[i].name);
        } else
            run_info[i].name = run_info[0].name;

        /* Setup op count if not varying ops. */
        if (run_info[i].nops == 0)
            run_info[i].nops = max_nops;
        total_nops += run_info[i].nops;
    }

    /* Setup the reader configurations */
    for (i = 0; i < readers; ++i) {
        offset = i + writers;
        if (multiple_files) {
            run_info[offset].name = dmalloc(64);
            /* Have readers read from tables with writes. */
            name_index = i % writers;
            testutil_check(__wt_snprintf(run_info[offset].name, 64, FNAME, (int)name_index));

            /* Vary by orders of magnitude */
            if (vary_nops)
                run_info[offset].nops = WT_MAX(1000, max_nops >> name_index);
        } else
            run_info[offset].name = run_info[0].name;

        /* Setup op count if not varying ops. */
        if (run_info[offset].nops == 0)
            run_info[offset].nops = max_nops;
        total_nops += run_info[offset].nops;
    }

    (void)gettimeofday(&start, NULL);

    /* Create threads. */
    for (i = 0; i < readers; ++i)
        testutil_check(__wt_thread_create(NULL, &tids[i], reader, (void *)(uintptr_t)i));
    for (; i < readers + writers; ++i)
        testutil_check(__wt_thread_create(NULL, &tids[i], writer, (void *)(uintptr_t)i));

    /* Wait for the threads. */
    for (i = 0; i < readers + writers; ++i)
        testutil_check(__wt_thread_join(NULL, &tids[i]));

    (void)gettimeofday(&stop, NULL);
    seconds = (stop.tv_sec - start.tv_sec) + (stop.tv_usec - start.tv_usec) * 1e-6;
    fprintf(stderr, "timer: %.2lf seconds (%d ops/second)\n", seconds,
      (int)(((readers + writers) * total_nops) / seconds));

    /* Verify the files. */
    for (i = 0; i < readers + writers; ++i) {
        verify(run_info[i].name);
        if (!multiple_files)
            break;
    }

    /* Output run statistics. */
    print_stats(readers + writers);

    /* Free allocated memory. */
    for (i = 0; i < readers + writers; ++i) {
        free(run_info[i].name);
        if (!multiple_files)
            break;
    }

    free(run_info);
    free(tids);
}

/*
 * reader_op --
 *     Read operation.
 */
static inline void
reader_op(WT_SESSION *session, WT_CURSOR *cursor, INFO *s)
{
    WT_ITEM *key, _key;
    size_t len;
    uint64_t keyno;
    int ret;
    char keybuf[64];

    key = &_key;

    keyno = __wt_random(&s->rnd) % nkeys + 1;
    if (ftype == ROW) {
        testutil_check(__wt_snprintf_len_set(keybuf, sizeof(keybuf), &len, "%017" PRIu64, keyno));
        key->data = keybuf;
        key->size = (uint32_t)len;
        cursor->set_key(cursor, key);
    } else
        cursor->set_key(cursor, keyno);
    if ((ret = cursor->search(cursor)) != 0 && ret != WT_NOTFOUND)
        testutil_die(ret, "cursor.search");
    if (log_print)
        testutil_check(
          session->log_printf(session, "Reader Thread %p key %017" PRIu64, pthread_self(), keyno));
}

/*
 * reader --
 *     Reader thread start function.
 */
static WT_THREAD_RET
reader(void *arg)
{
    INFO *s;
    WT_CURSOR *cursor;
    WT_SESSION *session;
    u_int i;
    int id;
    char tid[128];

    id = (int)(uintptr_t)arg;
    s = &run_info[id];
    testutil_check(__wt_thread_str(tid, sizeof(tid)));
    __wt_random_init(&s->rnd);

    printf(" read thread %2d starting: tid: %s, file: %s\n", id, tid, s->name);

    __wt_yield(); /* Get all the threads created. */

    if (session_per_op) {
        for (i = 0; i < s->nops; ++i, ++s->reads, __wt_yield()) {
            testutil_check(conn->open_session(conn, NULL, NULL, &session));
            testutil_check(session->open_cursor(session, s->name, NULL, NULL, &cursor));
            reader_op(session, cursor, s);
            testutil_check(session->close(session, NULL));
        }
    } else {
        testutil_check(conn->open_session(conn, NULL, NULL, &session));
        testutil_check(session->open_cursor(session, s->name, NULL, NULL, &cursor));
        for (i = 0; i < s->nops; ++i, ++s->reads, __wt_yield())
            reader_op(session, cursor, s);
        testutil_check(session->close(session, NULL));
    }

    printf(" read thread %2d stopping: tid: %s, file: %s\n", id, tid, s->name);

    return (WT_THREAD_RET_VALUE);
}

/*
 * writer_op --
 *     Write operation.
 */
static inline void
writer_op(WT_SESSION *session, WT_CURSOR *cursor, INFO *s)
{
    WT_ITEM *key, _key, *value, _value;
    size_t len;
    uint64_t keyno;
    int ret;
    char keybuf[64], valuebuf[64];

    key = &_key;
    value = &_value;

    keyno = __wt_random(&s->rnd) % nkeys + 1;
    if (ftype == ROW) {
        testutil_check(__wt_snprintf_len_set(keybuf, sizeof(keybuf), &len, "%017" PRIu64, keyno));
        key->data = keybuf;
        key->size = (uint32_t)len;
        cursor->set_key(cursor, key);
    } else
        cursor->set_key(cursor, keyno);
    if (keyno % 5 == 0) {
        ++s->remove;
        if ((ret = cursor->remove(cursor)) != 0 && ret != WT_NOTFOUND)
            testutil_die(ret, "cursor.remove");
    } else {
        ++s->update;
        value->data = valuebuf;
        if (ftype == FIX)
            cursor->set_value(cursor, 0x10);
        else {
            testutil_check(
              __wt_snprintf_len_set(valuebuf, sizeof(valuebuf), &len, "XXX %37" PRIu64, keyno));
            value->size = (uint32_t)len;
            cursor->set_value(cursor, value);
        }
        testutil_check(cursor->update(cursor));
    }
    if (log_print)
        testutil_check(
          session->log_printf(session, "Writer Thread %p key %017" PRIu64, pthread_self(), keyno));
}

/*
 * writer --
 *     Writer thread start function.
 */
static WT_THREAD_RET
writer(void *arg)
{
    INFO *s;
    WT_CURSOR *cursor;
    WT_SESSION *session;
    u_int i;
    int id;
    char tid[128];

    id = (int)(uintptr_t)arg;
    s = &run_info[id];
    testutil_check(__wt_thread_str(tid, sizeof(tid)));
    __wt_random_init(&s->rnd);

    printf("write thread %2d starting: tid: %s, file: %s\n", id, tid, s->name);

    __wt_yield(); /* Get all the threads created. */

    if (session_per_op) {
        for (i = 0; i < s->nops; ++i, __wt_yield()) {
            testutil_check(conn->open_session(conn, NULL, NULL, &session));
            testutil_check(session->open_cursor(session, s->name, NULL, NULL, &cursor));
            writer_op(session, cursor, s);
            testutil_check(session->close(session, NULL));
        }
    } else {
        testutil_check(conn->open_session(conn, NULL, NULL, &session));
        testutil_check(session->open_cursor(session, s->name, NULL, NULL, &cursor));
        for (i = 0; i < s->nops; ++i, __wt_yield())
            writer_op(session, cursor, s);
        testutil_check(session->close(session, NULL));
    }

    printf("write thread %2d stopping: tid: %s, file: %s\n", id, tid, s->name);

    return (WT_THREAD_RET_VALUE);
}

/*
 * print_stats --
 *     Display reader/writer thread stats.
 */
static void
print_stats(u_int nthreads)
{
    INFO *s;
    u_int id;

    s = run_info;
    for (id = 0; id < nthreads; ++id, ++s)
        printf("%3u: read %6d, remove %6d, update %6d\n", id, s->reads, s->remove, s->update);
}