mariadb/mysys/my_os2cond.c

/* Copyright (C) Yuri Dario & 2000 MySQL AB
   All the above parties has a full, independent copyright to
   the following code, including the right to use the code in
   any manner without any demands from the other parties.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; version 2
   of the License.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA */

/*****************************************************************************
** The following is a simple implementation of posix conditions
*****************************************************************************/

#undef SAFE_MUTEX                       /* Avoid safe_mutex redefinitions */
#include "mysys_priv.h"
#if defined(THREAD) && defined(OS2)
#include <m_string.h>
#include <process.h>
#include <sys/timeb.h>

int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
{
  cond->waiting= 0;
  /* Warp3 FP29 or Warp4 FP4 or better required */
  if (DosCreateEventSem(NULL, &cond->semaphore, 0x0800, 0))
    return ENOMEM;
  return 0;
}

int pthread_cond_destroy(pthread_cond_t *cond)
{
  for (;;)
  {
    APIRET rc;
    if ((rc= DosCloseEventSem(cond->semaphore)) != 301)
      return rc ? EINVAL : 0;
    DosPostEventSem(cond->semaphore);
  }
}


int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
  int rval= 0;
  cond->waiting++;
  if (mutex)
    pthread_mutex_unlock(mutex);
  if (DosWaitEventSem(cond->semaphore, SEM_INDEFINITE_WAIT))
    rval= EINVAL;
  if (mutex)
    pthread_mutex_lock(mutex);
  cond->waiting--;
  return rval;
}

int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
                           struct timespec *abstime)
{
  struct timeb curtime;
  int result;
  long timeout;
  int rval= 0;

  _ftime(&curtime);
  timeout= ((long) (abstime->ts_sec - curtime.time) * 1000L +
            (long) ((abstime->ts_nsec / 1000) - curtime.millitm) / 1000L);
  if (timeout < 0)                              /* Some safety */
    timeout= 0L;

  cond->waiting++;

  if (mutex)
    pthread_mutex_unlock(mutex);
  if (DosWaitEventSem(cond->semaphore, timeout) != 0)
    rval= ETIMEDOUT;
  if (mutex)
    pthread_mutex_lock(mutex);

  cond->waiting--;

  return rval;
}


int pthread_cond_signal(pthread_cond_t *cond)
{
  /* Bring the next thread off the condition queue: */
  DosPostEventSem(cond->semaphore);
  return 0;
}


int pthread_cond_broadcast(pthread_cond_t *cond)
{
  int i;
  /* Enter a loop to bring all threads off the condition queue */
  for (i= cond->waiting; i--;)
    DosPostEventSem(cond->semaphore);
  return 0;
}


int pthread_attr_init(pthread_attr_t *connect_att)
{
  connect_att->dwStackSize= 0;
  connect_att->dwCreatingFlag= 0;
  connect_att->priority= 0;
  return 0;
}

int pthread_attr_setstacksize(pthread_attr_t *connect_att, DWORD stack)
{
  connect_att->dwStackSize= stack;
  return 0;
}

int pthread_attr_setprio(pthread_attr_t *connect_att, int priority)
{
  connect_att->priority= priority;
  return 0;
}

int pthread_attr_destroy(pthread_attr_t *connect_att)
{
  bzero((gptr) connect_att, sizeof(*connect_att));
  return 0;
}

/****************************************************************************
** Fix localtime_r() to be a bit safer
****************************************************************************/

struct tm *localtime_r(const time_t *timep, struct tm *tmp)
{
  if (*timep == (time_t) - 1)                   /* This will crash win32 */
  {
    bzero(tmp, sizeof(*tmp));
  }
  else
  {
    struct tm *res= localtime(timep);
    if (!res)                                   /* Wrong date */
    {
      bzero(tmp, sizeof(*tmp));                 /* Keep things safe */
      return 0;
    }
    *tmp= *res;
  }
  return tmp;
}
#endif                                          /* __WIN__ */