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915cebdd53
tablockman: fixed a bug in finding a blocker lock mysys/my_getsystime.c: this is no longer true storage/maria/lockman.h: post-review fixes storage/maria/tablockman.h: post-review fixes storage/maria/unittest/lockman-t.c: post-review fixes storage/maria/unittest/lockman1-t.c: post-review fixes storage/maria/unittest/lockman2-t.c: post-review fixes include/my_atomic.h: moved intptr definition to my_global.h storage/maria/tablockman.c: post-review fixes BUILD/SETUP.sh: add -DMY_LF_EXTRA_DEBUG to debug builds include/atomic/nolock.h: suppress warning include/my_global.h: suppress warning mysys/lf_alloc-pin.c: post-review fixes mysys/lf_dynarray.c: post-review fixes mysys/lf_hash.c: post-review fixes storage/maria/trnman.c: suppress warning include/lf.h: post-review fix
181 lines
4.7 KiB
C
181 lines
4.7 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; either version 2 of the License, or
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(at your option) any later version.
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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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/*
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This header defines five atomic operations:
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my_atomic_add#(&var, what)
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add 'what' to *var, and return the old value of *var
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my_atomic_fas#(&var, what)
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'Fetch And Store'
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store 'what' in *var, and return the old value of *var
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my_atomic_cas#(&var, &old, new)
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'Compare And Swap'
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if *var is equal to *old, then store 'new' in *var, and return TRUE
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otherwise store *var in *old, and return FALSE
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my_atomic_load#(&var)
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return *var
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my_atomic_store#(&var, what)
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store 'what' in *var
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'#' is substituted by a size suffix - 8, 16, 32, or ptr
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(e.g. my_atomic_add8, my_atomic_fas32, my_atomic_casptr).
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NOTE This operations are not always atomic, so they always must be
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enclosed in my_atomic_rwlock_rdlock(lock)/my_atomic_rwlock_rdunlock(lock)
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or my_atomic_rwlock_wrlock(lock)/my_atomic_rwlock_wrunlock(lock).
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Hint: if a code block makes intensive use of atomic ops, it make sense
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to take/release rwlock once for the whole block, not for every statement.
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On architectures where these operations are really atomic, rwlocks will
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be optimized away.
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*/
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#ifndef my_atomic_rwlock_init
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#define intptr void *
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#ifndef MY_ATOMIC_MODE_RWLOCKS
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#include "atomic/nolock.h"
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#endif
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#ifndef make_atomic_cas_body
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#include "atomic/rwlock.h"
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#endif
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#ifndef make_atomic_add_body
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#define make_atomic_add_body(S) \
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int ## S tmp=*a; \
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while (!my_atomic_cas ## S(a, &tmp, tmp+v)); \
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v=tmp;
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#endif
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#ifdef HAVE_INLINE
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#define make_atomic_add(S) \
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STATIC_INLINE int ## S my_atomic_add ## S( \
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int ## S volatile *a, int ## S v) \
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{ \
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make_atomic_add_body(S); \
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return v; \
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}
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#define make_atomic_fas(S) \
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STATIC_INLINE int ## S my_atomic_fas ## S( \
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int ## S volatile *a, int ## S v) \
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{ \
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make_atomic_fas_body(S); \
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return v; \
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}
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#define make_atomic_cas(S) \
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STATIC_INLINE int my_atomic_cas ## S(int ## S volatile *a, \
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int ## S *cmp, int ## S set) \
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{ \
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int8 ret; \
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make_atomic_cas_body(S); \
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return ret; \
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}
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#define make_atomic_load(S) \
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STATIC_INLINE int ## S my_atomic_load ## S(int ## S volatile *a) \
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{ \
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int ## S ret; \
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make_atomic_load_body(S); \
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return ret; \
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}
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#define make_atomic_store(S) \
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STATIC_INLINE void my_atomic_store ## S( \
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int ## S volatile *a, int ## S v) \
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{ \
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make_atomic_store_body(S); \
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}
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#else /* no inline functions */
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#define make_atomic_add(S) \
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extern int ## S my_atomic_add ## S(int ## S volatile *a, int ## S v);
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#define make_atomic_fas(S) \
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extern int ## S my_atomic_fas ## S(int ## S volatile *a, int ## S v);
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#define make_atomic_cas(S) \
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extern int my_atomic_cas ## S(int ## S volatile *a, int ## S *cmp, int ## S set);
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#define make_atomic_load(S) \
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extern int ## S my_atomic_load ## S(int ## S volatile *a);
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#define make_atomic_store(S) \
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extern void my_atomic_store ## S(int ## S volatile *a, int ## S v);
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#endif
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make_atomic_cas( 8)
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make_atomic_cas(16)
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make_atomic_cas(32)
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make_atomic_cas(ptr)
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make_atomic_add( 8)
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make_atomic_add(16)
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make_atomic_add(32)
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make_atomic_load( 8)
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make_atomic_load(16)
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make_atomic_load(32)
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make_atomic_load(ptr)
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make_atomic_store( 8)
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make_atomic_store(16)
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make_atomic_store(32)
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make_atomic_store(ptr)
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make_atomic_fas( 8)
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make_atomic_fas(16)
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make_atomic_fas(32)
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make_atomic_fas(ptr)
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#ifdef _atomic_h_cleanup_
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#include _atomic_h_cleanup_
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#undef _atomic_h_cleanup_
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#endif
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#undef make_atomic_add
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#undef make_atomic_cas
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#undef make_atomic_load
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#undef make_atomic_store
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#undef make_atomic_fas
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#undef make_atomic_add_body
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#undef make_atomic_cas_body
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#undef make_atomic_load_body
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#undef make_atomic_store_body
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#undef make_atomic_fas_body
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#undef intptr
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#ifndef LF_BACKOFF
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#define LF_BACKOFF (1)
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#endif
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#define MY_ATOMIC_OK 0
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#define MY_ATOMIC_NOT_1CPU 1
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extern int my_atomic_initialize();
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#endif
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