diff options
Diffstat (limited to 'externals/mysql/mysys/my_wincond.c')
| -rw-r--r-- | externals/mysql/mysys/my_wincond.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/externals/mysql/mysys/my_wincond.c b/externals/mysql/mysys/my_wincond.c new file mode 100644 index 00000000000..862eafce435 --- /dev/null +++ b/externals/mysql/mysys/my_wincond.c @@ -0,0 +1,222 @@ +/* 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__ */ |