~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2009 Sun Microsystems

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; version 2 of the License.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

/*

  Just a test application for threads.

  */

#include "config.h"

#include "azio.h"

#include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <sys/mman.h>

#include <fcntl.h>

#include <sys/time.h>

#include <pthread.h>

#include <string.h>                             /* Pull in memset() */

#ifndef __WIN__

#include <sys/wait.h>

#endif

#ifdef __WIN__

#define srandom  srand

#define random   rand

#define snprintf _snprintf

#endif

#include "azio.h"

#define DEFAULT_INITIAL_LOAD 10000

#define DEFAULT_EXECUTE_SECONDS 120

#define TEST_FILENAME "concurrency_test.az"

#define HUGE_STRING_LENGTH 8192

/* Global Thread counter */

unsigned int thread_counter;

pthread_mutex_t counter_mutex;

pthread_cond_t count_threshhold;

unsigned int master_wakeup;

pthread_mutex_t sleeper_mutex;

pthread_cond_t sleep_threshhold;

static bool timer_alarm= false;

pthread_mutex_t timer_alarm_mutex;

pthread_cond_t timer_alarm_threshold;

pthread_mutex_t row_lock;

/* Prototypes */

extern "C" {

  void *run_concurrent_task(void *p);

  void *timer_thread(void *p);

}

void scheduler(az_method use_aio);

void create_data_file(azio_stream *write_handler, uint64_t rows);

unsigned int write_row(azio_stream *s);

typedef struct thread_context_st thread_context_st;

struct thread_context_st {

  unsigned int how_often_to_write;

  uint64_t counter;

  az_method use_aio;

  azio_stream *writer;

};

/* Use this for string generation */

static const char ALPHANUMERICS[]=

  "0123456789ABCDEFGHIJKLMNOPQRSTWXYZabcdefghijklmnopqrstuvwxyz";

#define ALPHANUMERICS_SIZE (sizeof(ALPHANUMERICS)-1)

static void get_random_string(char *buffer, size_t size)

{

  char *buffer_ptr= buffer;

  while (--size)

    *buffer_ptr++= ALPHANUMERICS[random() % ALPHANUMERICS_SIZE];

  *buffer_ptr++= ALPHANUMERICS[random() % ALPHANUMERICS_SIZE];

}

int main(int argc, char *argv[])

{

  unsigned int method;

  drizzled::internal::my_init();

  MY_INIT(argv[0]);

  if (argc > 1)

    exit(1);

  srandom(time(NULL));

  pthread_mutex_init(&counter_mutex, NULL);

  pthread_cond_init(&count_threshhold, NULL);

  pthread_mutex_init(&sleeper_mutex, NULL);

  pthread_cond_init(&sleep_threshhold, NULL);

  pthread_mutex_init(&timer_alarm_mutex, NULL);

  pthread_cond_init(&timer_alarm_threshold, NULL);

  pthread_mutex_init(&row_lock, NULL);

  for (method= AZ_METHOD_BLOCK; method < AZ_METHOD_MAX; method++)

    scheduler((az_method)method);

  (void)pthread_mutex_destroy(&counter_mutex);

  (void)pthread_cond_destroy(&count_threshhold);

  (void)pthread_mutex_destroy(&sleeper_mutex);

  (void)pthread_cond_destroy(&sleep_threshhold);

  pthread_mutex_destroy(&timer_alarm_mutex);

  pthread_cond_destroy(&timer_alarm_threshold);

  pthread_mutex_destroy(&row_lock);

  return 0;

}

void scheduler(az_method use_aio)

{

  unsigned int x;

  uint64_t total;

  azio_stream writer_handle;

  thread_context_st *context;

  pthread_t mainthread;            /* Thread descriptor */

  pthread_attr_t attr;          /* Thread attributes */

  pthread_attr_init(&attr);

  pthread_attr_setdetachstate(&attr,

                              PTHREAD_CREATE_DETACHED);

  pthread_mutex_lock(&counter_mutex);

  thread_counter= 0;

  create_data_file(&writer_handle, DEFAULT_INITIAL_LOAD);

  pthread_mutex_lock(&sleeper_mutex);

  master_wakeup= 1;

  pthread_mutex_unlock(&sleeper_mutex);

  context= (thread_context_st *)malloc(sizeof(thread_context_st) * DEFAULT_CONCURRENCY);

  memset(context, 0, sizeof(thread_context_st) * DEFAULT_CONCURRENCY);

  if (!context)

  {

    fprintf(stderr, "Could not allocate memory for context\n");

    exit(1);

  }

  for (x= 0; x < DEFAULT_CONCURRENCY; x++)

  {

    context[x].how_often_to_write= random()%1000;

    context[x].writer= &writer_handle;

    context[x].counter= 0;

    context[x].use_aio= use_aio;

    /* now you create the thread */

    if (pthread_create(&mainthread, &attr, run_concurrent_task,

                       (void *)context) != 0)

    {

      fprintf(stderr,"Could not create thread\n");

      exit(1);

    }

    thread_counter++;

  }

  if (DEFAULT_EXECUTE_SECONDS)

  {

    time_t opt_timer_length= DEFAULT_EXECUTE_SECONDS;

    pthread_mutex_lock(&timer_alarm_mutex);

    timer_alarm= true;

    pthread_mutex_unlock(&timer_alarm_mutex);

    if (pthread_create(&mainthread, &attr, timer_thread,

                       (void *)&opt_timer_length) != 0)

    {

      fprintf(stderr,"%s: Could not create timer thread\n", drizzled::internal::my_progname);

      exit(1);

    }

  }

  pthread_mutex_unlock(&counter_mutex);

  pthread_attr_destroy(&attr);

  pthread_mutex_lock(&sleeper_mutex);

  master_wakeup= 0;

  pthread_mutex_unlock(&sleeper_mutex);

  pthread_cond_broadcast(&sleep_threshhold);

  /*

    We loop until we know that all children have cleaned up.

  */

  pthread_mutex_lock(&counter_mutex);

  while (thread_counter)

  {

    struct timespec abstime;

    memset(&abstime, 0, sizeof(struct timespec));

    abstime.tv_sec= 1;

    pthread_cond_timedwait(&count_threshhold, &counter_mutex, &abstime);

  }

  pthread_mutex_unlock(&counter_mutex);

  for (total= x= 0; x < DEFAULT_CONCURRENCY; x++)

    total+= context[x].counter;

  free(context);

  azclose(&writer_handle);

  printf("Read %"PRIu64" rows\n", total);

}

void *timer_thread(void *p)

{

  time_t *timer_length= (time_t *)p;

  struct timespec abstime;

  /*

    We lock around the initial call in case were we in a loop. This

    also keeps the value properly syncronized across call threads.

  */

  pthread_mutex_lock(&sleeper_mutex);

  while (master_wakeup)

  {

    pthread_cond_wait(&sleep_threshhold, &sleeper_mutex);

  }

  pthread_mutex_unlock(&sleeper_mutex);

  set_timespec(abstime, *timer_length);

  pthread_mutex_lock(&timer_alarm_mutex);

  pthread_cond_timedwait(&timer_alarm_threshold, &timer_alarm_mutex, &abstime);

  pthread_mutex_unlock(&timer_alarm_mutex);

  pthread_mutex_lock(&timer_alarm_mutex);

  timer_alarm= false;

  pthread_mutex_unlock(&timer_alarm_mutex);

  return 0;

}

void *run_concurrent_task(void *p)

{

  thread_context_st *context= (thread_context_st *)p;

  uint64_t count;

  int ret;

  int error;

  azio_stream reader_handle;

  if (!(ret= azopen(&reader_handle, TEST_FILENAME, O_RDONLY,

                    context->use_aio)))

  {

    printf("Could not open test file\n");

    return 0;

  }

  pthread_mutex_lock(&sleeper_mutex);

  while (master_wakeup)

  {

    pthread_cond_wait(&sleep_threshhold, &sleeper_mutex);

  }

  pthread_mutex_unlock(&sleeper_mutex);

  /* Do Stuff */

  count= 0;

  while (1)

  {

    azread_init(&reader_handle);

    while ((ret= azread_row(&reader_handle, &error)))

      context->counter++;

    if (count % context->how_often_to_write)

    {

      write_row(context->writer);

    }

    /* If the timer is set, and the alarm is not active then end */

    if (timer_alarm == false)

      break;

  }

  pthread_mutex_lock(&counter_mutex);

  thread_counter--;

  pthread_cond_signal(&count_threshhold);

  pthread_mutex_unlock(&counter_mutex);

  azclose(&reader_handle);

  return NULL;

}

void create_data_file(azio_stream *write_handler, uint64_t rows)

{

  int ret;

  uint64_t x;

  if (!(ret= azopen(write_handler, TEST_FILENAME, O_CREAT|O_RDWR|O_TRUNC,

                    AZ_METHOD_BLOCK)))

  {

    printf("Could not create test file\n");

    exit(1);

  }

  for (x= 0; x < rows; x++)

    write_row(write_handler);

  azflush(write_handler, Z_SYNC_FLUSH);

}

unsigned int write_row(azio_stream *s)

{

  size_t length;

  char buffer[HUGE_STRING_LENGTH];

  length= random() % HUGE_STRING_LENGTH;

  /* Avoid zero length strings */

  length++;

  get_random_string(buffer, length);

  pthread_mutex_lock(&row_lock);

  azwrite_row(s, buffer, length);

  pthread_mutex_unlock(&row_lock);

  return 0;

}