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/* Copyright (C) 2000 MySQL AB
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*****************************************************************************
** The following is a simple implementation of posix conditions
*****************************************************************************/
#if defined(_WIN32)
#undef SAFE_MUTEX /* Avoid safe_mutex redefinitions */
#include "mysys_priv.h"
#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;
InitializeCriticalSection(&cond->lock_waiting);
cond->events[SIGNAL]= CreateEvent(NULL, /* no security */
FALSE, /* auto-reset event */
FALSE, /* non-signaled initially */
NULL); /* unnamed */
/* Create a manual-reset event. */
cond->events[BROADCAST]= CreateEvent(NULL, /* no security */
TRUE, /* manual-reset */
FALSE, /* non-signaled initially */
NULL); /* unnamed */
cond->broadcast_block_event= CreateEvent(NULL, /* no security */
TRUE, /* manual-reset */
TRUE, /* signaled initially */
NULL); /* unnamed */
if( cond->events[SIGNAL] == NULL ||
cond->events[BROADCAST] == NULL ||
cond->broadcast_block_event == NULL )
return ENOMEM;
return 0;
}
int pthread_cond_destroy(pthread_cond_t *cond)
{
DeleteCriticalSection(&cond->lock_waiting);
if (CloseHandle(cond->events[SIGNAL]) == 0 ||
CloseHandle(cond->events[BROADCAST]) == 0 ||
CloseHandle(cond->broadcast_block_event) == 0)
return EINVAL;
return 0;
}
int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
return pthread_cond_timedwait(cond,mutex,NULL);
}
int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
struct timespec *abstime)
{
int result;
long timeout;
union ft64 now;
if( abstime != NULL )
{
GetSystemTimeAsFileTime(&now.ft);
/*
Calculate time left to abstime
- subtract start time from current time(values are in 100ns units)
- convert to millisec by dividing with 10000
*/
timeout= (long)((abstime->tv.i64 - now.i64) / 10000);
/* Don't allow the timeout to be negative */
if (timeout < 0)
timeout= 0L;
/*
Make sure the calucated timeout does not exceed original timeout
value which could cause "wait for ever" if system time changes
*/
if (timeout > abstime->max_timeout_msec)
timeout= abstime->max_timeout_msec;
}
else
{
/* No time specified; don't expire */
timeout= INFINITE;
}
/*
Block access if previous broadcast hasn't finished.
This is just for safety and should normally not
affect the total time spent in this function.
*/
WaitForSingleObject(cond->broadcast_block_event, INFINITE);
EnterCriticalSection(&cond->lock_waiting);
cond->waiting++;
LeaveCriticalSection(&cond->lock_waiting);
LeaveCriticalSection(mutex);
result= WaitForMultipleObjects(2, cond->events, FALSE, timeout);
EnterCriticalSection(&cond->lock_waiting);
cond->waiting--;
if (cond->waiting == 0)
{
/*
We're the last waiter to be notified or to stop waiting, so
reset the manual event.
*/
/* Close broadcast gate */
ResetEvent(cond->events[BROADCAST]);
/* Open block gate */
SetEvent(cond->broadcast_block_event);
}
LeaveCriticalSection(&cond->lock_waiting);
EnterCriticalSection(mutex);
return result == WAIT_TIMEOUT ? ETIMEDOUT : 0;
}
int pthread_cond_signal(pthread_cond_t *cond)
{
EnterCriticalSection(&cond->lock_waiting);
if(cond->waiting > 0)
SetEvent(cond->events[SIGNAL]);
LeaveCriticalSection(&cond->lock_waiting);
return 0;
}
int pthread_cond_broadcast(pthread_cond_t *cond)
{
EnterCriticalSection(&cond->lock_waiting);
/*
The mutex protect us from broadcasting if
there isn't any thread waiting to open the
block gate after this call has closed it.
*/
if(cond->waiting > 0)
{
/* Close block gate */
ResetEvent(cond->broadcast_block_event);
/* Open broadcast gate */
SetEvent(cond->events[BROADCAST]);
}
LeaveCriticalSection(&cond->lock_waiting);
return 0;
}
int pthread_attr_init(pthread_attr_t *connect_att)
{
connect_att->dwStackSize = 0;
connect_att->dwCreatingFlag = 0;
return 0;
}
int pthread_attr_setstacksize(pthread_attr_t *connect_att,DWORD stack)
{
connect_att->dwStackSize=stack;
return 0;
}
int pthread_attr_destroy(pthread_attr_t *connect_att)
{
bzero((uchar*) 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__ */
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