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MySQL 5.1: mysql/src/5.1-dbg/include/atomic/rwlock.h Source File

mysql/src/5.1-dbg/include/atomic/rwlock.h

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00001 /* Copyright (C) 2006 MySQL AB
00002 
00003    This program is free software; you can redistribute it and/or modify
00004    it under the terms of the GNU General Public License as published by
00005    the Free Software Foundation; either version 2 of the License, or
00006    (at your option) any later version.
00007 
00008    This program is distributed in the hope that it will be useful,
00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011    GNU General Public License for more details.
00012 
00013    You should have received a copy of the GNU General Public License
00014    along with this program; if not, write to the Free Software
00015    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
00016 
00017 typedef struct {pthread_rwlock_t rw;} my_atomic_rwlock_t;
00018 
00019 #ifdef MY_ATOMIC_MODE_DUMMY
00020 /*
00021   the following can never be enabled by ./configure, one need to put #define in
00022   a source to trigger the following warning. The resulting code will be broken,
00023   it only makes sense to do it to see now test_atomic detects broken
00024   implementations (another way is to run a UP build on an SMP box).
00025 */
00026 #warning MY_ATOMIC_MODE_DUMMY and MY_ATOMIC_MODE_RWLOCKS are incompatible
00027 #define my_atomic_rwlock_destroy(name)
00028 #define my_atomic_rwlock_init(name)
00029 #define my_atomic_rwlock_rdlock(name)
00030 #define my_atomic_rwlock_wrlock(name)
00031 #define my_atomic_rwlock_rdunlock(name)
00032 #define my_atomic_rwlock_wrunlock(name)
00033 #define MY_ATOMIC_MODE "dummy (non-atomic)"
00034 #else
00035 #define my_atomic_rwlock_destroy(name)     pthread_rwlock_destroy(& (name)->rw)
00036 #define my_atomic_rwlock_init(name)        pthread_rwlock_init(& (name)->rw, 0)
00037 #define my_atomic_rwlock_rdlock(name)      pthread_rwlock_rdlock(& (name)->rw)
00038 #define my_atomic_rwlock_wrlock(name)      pthread_rwlock_wrlock(& (name)->rw)
00039 #define my_atomic_rwlock_rdunlock(name)    pthread_rwlock_unlock(& (name)->rw)
00040 #define my_atomic_rwlock_wrunlock(name)    pthread_rwlock_unlock(& (name)->rw)
00041 #define MY_ATOMIC_MODE "rwlocks"
00042 #endif
00043 
00044 #define make_atomic_add_body(S)     int ## S sav; sav= *a; *a+= v; v=sav;
00045 #define make_atomic_swap_body(S)    int ## S sav; sav= *a; *a= v; v=sav;
00046 #define make_atomic_cas_body(S)     if ((ret= (*a == *cmp))) *a= set; else *cmp=*a;
00047 #define make_atomic_load_body(S)    ret= *a;
00048 #define make_atomic_store_body(S)   *a= v;
00049
Generated on Sat Sep 9 00:49:49 2006 for MySQL 5.1 by  doxygen 1.4.7