diff options
Diffstat (limited to 'include/atomic/rwlock.h')
| -rw-r--r-- | include/atomic/rwlock.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/include/atomic/rwlock.h b/include/atomic/rwlock.h new file mode 100644 index 00000000000..12d0dd3f069 --- /dev/null +++ b/include/atomic/rwlock.h @@ -0,0 +1,49 @@ +/* Copyright (C) 2006 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; either version 2 of the License, or + (at your option) any later version. + + 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 */ + +typedef struct {pthread_rwlock_t rw;} my_atomic_rwlock_t; + +#ifdef MY_ATOMIC_MODE_DUMMY +/* + the following can never be enabled by ./configure, one need to put #define in + a source to trigger the following warning. The resulting code will be broken, + it only makes sense to do it to see now test_atomic detects broken + implementations (another way is to run a UP build on an SMP box). +*/ +#warning MY_ATOMIC_MODE_DUMMY and MY_ATOMIC_MODE_RWLOCKS are incompatible +#define my_atomic_rwlock_destroy(name) +#define my_atomic_rwlock_init(name) +#define my_atomic_rwlock_rdlock(name) +#define my_atomic_rwlock_wrlock(name) +#define my_atomic_rwlock_rdunlock(name) +#define my_atomic_rwlock_wrunlock(name) +#define MY_ATOMIC_MODE "dummy (non-atomic)" +#else +#define my_atomic_rwlock_destroy(name) pthread_rwlock_destroy(& (name)->rw) +#define my_atomic_rwlock_init(name) pthread_rwlock_init(& (name)->rw, 0) +#define my_atomic_rwlock_rdlock(name) pthread_rwlock_rdlock(& (name)->rw) +#define my_atomic_rwlock_wrlock(name) pthread_rwlock_wrlock(& (name)->rw) +#define my_atomic_rwlock_rdunlock(name) pthread_rwlock_unlock(& (name)->rw) +#define my_atomic_rwlock_wrunlock(name) pthread_rwlock_unlock(& (name)->rw) +#define MY_ATOMIC_MODE "rwlocks" +#endif + +#define make_atomic_add_body(S) int ## S sav; sav= *a; *a+= v; v=sav; +#define make_atomic_swap_body(S) int ## S sav; sav= *a; *a= v; v=sav; +#define make_atomic_cas_body(S) if ((ret= (*a == *cmp))) *a= set; else *cmp=*a; +#define make_atomic_load_body(S) ret= *a; +#define make_atomic_store_body(S) *a= v; + |