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48 lines
2.2 KiB
C
48 lines
2.2 KiB
C
/* Copyright (C) 2006 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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typedef struct {pthread_rwlock_t rw;} my_atomic_rwlock_t;
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#ifdef MY_ATOMIC_MODE_DUMMY
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/*
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the following can never be enabled by ./configure, one need to put #define in
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a source to trigger the following warning. The resulting code will be broken,
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it only makes sense to do it to see now test_atomic detects broken
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implementations (another way is to run a UP build on an SMP box).
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*/
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#warning MY_ATOMIC_MODE_DUMMY and MY_ATOMIC_MODE_RWLOCKS are incompatible
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#define my_atomic_rwlock_destroy(name)
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#define my_atomic_rwlock_init(name)
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#define my_atomic_rwlock_rdlock(name)
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#define my_atomic_rwlock_wrlock(name)
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#define my_atomic_rwlock_rdunlock(name)
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#define my_atomic_rwlock_wrunlock(name)
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#define MY_ATOMIC_MODE "dummy (non-atomic)"
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#else
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#define my_atomic_rwlock_destroy(name) pthread_rwlock_destroy(& (name)->rw)
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#define my_atomic_rwlock_init(name) pthread_rwlock_init(& (name)->rw, 0)
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#define my_atomic_rwlock_rdlock(name) pthread_rwlock_rdlock(& (name)->rw)
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#define my_atomic_rwlock_wrlock(name) pthread_rwlock_wrlock(& (name)->rw)
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#define my_atomic_rwlock_rdunlock(name) pthread_rwlock_unlock(& (name)->rw)
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#define my_atomic_rwlock_wrunlock(name) pthread_rwlock_unlock(& (name)->rw)
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#define MY_ATOMIC_MODE "rwlocks"
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#endif
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#define make_atomic_add_body(S) int ## S sav; sav= *a; *a+= v; v=sav;
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#define make_atomic_swap_body(S) int ## S sav; sav= *a; *a= v; v=sav;
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#define make_atomic_cas_body(S) if ((ret= (*a == *cmp))) *a= set; else *cmp=*a;
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#define make_atomic_load_body(S) ret= *a;
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#define make_atomic_store_body(S) *a= v;
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