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; either
   version 2 of the License, or (at your option) any later version.

   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)
{
   APIRET	   rc = 0;
   HEV		   event;
   cond->waiting=0;
   /* Warp3 FP29 or Warp4 FP4 or better required */
   rc = DosCreateEventSem( NULL, &cond->semaphore, 0x0800, 0);
   if (rc)
      return ENOMEM;

  return 0;
}

int pthread_cond_destroy(pthread_cond_t *cond)
{
   APIRET   rc;

   do {
      rc = DosCloseEventSem(cond->semaphore);
      if (rc == 301) DosPostEventSem(cond->semaphore);
   } while (rc == 301);
   if (rc)
      return EINVAL;

	return 0;
}


int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
   APIRET   rc;
   int	    rval;

   rval = 0;
   cond->waiting++;

   if (mutex) pthread_mutex_unlock(mutex);

   rc = DosWaitEventSem(cond->semaphore,SEM_INDEFINITE_WAIT);
   if (rc != 0)
      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;
   APIRET   rc;
   int	    rval;

   _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;

   rval = 0;
   cond->waiting++;

   if (mutex) pthread_mutex_unlock(mutex);

   rc = DosWaitEventSem(cond->semaphore, timeout);
   if (rc != 0)
      rval = ETIME;

   if (mutex) pthread_mutex_lock(mutex);

   cond->waiting--;

   return rval;
}


int pthread_cond_signal(pthread_cond_t *cond)
{
   APIRET   rc;

   /* Bring the next thread off the condition queue: */
   rc = DosPostEventSem(cond->semaphore);
   return 0;
}


int pthread_cond_broadcast(pthread_cond_t *cond)
{
   int	    i;
   APIRET   rc;

		/*
		 * Enter a loop to bring all threads off the
		 * condition queue:
		 */
   i = cond->waiting;
   while (i--) rc = 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__ */