dep/mysqllite/include/my_no_pthread.h

   1 /* Copyright (C) 2000 MySQL AB
   2
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; version 2 of the License.
   6
   7    This program is distributed in the hope that it will be useful,
   8    but WITHOUT ANY WARRANTY; without even the implied warranty of
   9    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10    GNU General Public License for more details.
  11
  12    You should have received a copy of the GNU General Public License
  13    along with this program; if not, write to the Free Software
  14    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  15
  16
  17 #if !defined(_my_no_pthread_h) && !defined(THREAD)
  18 #define _my_no_pthread_h
  19
  20
  21 /*
  22   This block is to access some thread-related type definitions
  23   even in builds which do not need thread functions,
  24   as some variables (based on these types) are declared
  25   even in non-threaded builds.
  26   Case in point: 'mf_keycache.c'
  27 */
  28 #if defined(__WIN__)
  29 #else /* Normal threads */
  30 #include <pthread.h>
  31
  32 #endif /* defined(__WIN__) */
  33
  34
  35 /*
  36   This undefs some pthread mutex locks when one isn't using threads
  37   to make thread safe code, that should also work in single thread
  38   environment, easier to use.
  39 */
  40 #define pthread_mutex_init(A,B)
  41 #define pthread_mutex_lock(A)
  42 #define pthread_mutex_unlock(A)
  43 #define pthread_mutex_destroy(A)
  44 #define my_rwlock_init(A,B)
  45 #define rw_rdlock(A)
  46 #define rw_wrlock(A)
  47 #define rw_unlock(A)
  48 #define rwlock_destroy(A)
  49
  50 typedef int my_pthread_once_t;
  51 #define MY_PTHREAD_ONCE_INIT 0
  52 #define MY_PTHREAD_ONCE_DONE 1
  53
  54 #define my_pthread_once(C,F) do { \
  55     if (*(C) != MY_PTHREAD_ONCE_DONE) { F(); *(C)= MY_PTHREAD_ONCE_DONE; } \
  56   } while(0)
  57
  58 #endif