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Diffstat (limited to 'externals/mysql/my_atomic.h')
| -rw-r--r-- | externals/mysql/my_atomic.h | 254 |
1 files changed, 0 insertions, 254 deletions
diff --git a/externals/mysql/my_atomic.h b/externals/mysql/my_atomic.h deleted file mode 100644 index 40b8895657d..00000000000 --- a/externals/mysql/my_atomic.h +++ /dev/null @@ -1,254 +0,0 @@ -/* 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; version 2 of the License. - - 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 */ - -/* - This header defines five atomic operations: - - my_atomic_add#(&var, what) - add 'what' to *var, and return the old value of *var - - my_atomic_fas#(&var, what) - 'Fetch And Store' - store 'what' in *var, and return the old value of *var - - my_atomic_cas#(&var, &old, new) - 'Compare And Swap' - if *var is equal to *old, then store 'new' in *var, and return TRUE - otherwise store *var in *old, and return FALSE - - my_atomic_load#(&var) - return *var - - my_atomic_store#(&var, what) - store 'what' in *var - - '#' is substituted by a size suffix - 8, 16, 32, or ptr - (e.g. my_atomic_add8, my_atomic_fas32, my_atomic_casptr). - - NOTE This operations are not always atomic, so they always must be - enclosed in my_atomic_rwlock_rdlock(lock)/my_atomic_rwlock_rdunlock(lock) - or my_atomic_rwlock_wrlock(lock)/my_atomic_rwlock_wrunlock(lock). - Hint: if a code block makes intensive use of atomic ops, it make sense - to take/release rwlock once for the whole block, not for every statement. - - On architectures where these operations are really atomic, rwlocks will - be optimized away. - 8- and 16-bit atomics aren't implemented for windows (see generic-msvc.h), - but can be added, if necessary. -*/ - -#ifndef my_atomic_rwlock_init - -#define intptr void * - -#ifndef MY_ATOMIC_MODE_RWLOCKS -#include "atomic/nolock.h" -#endif - -#ifndef make_atomic_cas_body -/* nolock.h was not able to generate even a CAS function, fall back */ -#include "atomic/rwlock.h" -#else -/* define missing functions by using the already generated ones */ -#ifndef make_atomic_add_body -#define make_atomic_add_body(S) \ - int ## S tmp=*a; \ - while (!my_atomic_cas ## S(a, &tmp, tmp+v)); \ - v=tmp; -#endif -#ifndef make_atomic_fas_body -#define make_atomic_fas_body(S) \ - int ## S tmp=*a; \ - while (!my_atomic_cas ## S(a, &tmp, v)); \ - v=tmp; -#endif -#ifndef make_atomic_load_body -#define make_atomic_load_body(S) \ - ret= 0; /* avoid compiler warning */ \ - (void)(my_atomic_cas ## S(a, &ret, ret)); -#endif -#ifndef make_atomic_store_body -#define make_atomic_store_body(S) \ - (void)(my_atomic_fas ## S (a, v)); -#endif -#endif - -/* - transparent_union doesn't work in g++ - Bug ? - - Darwin's gcc doesn't want to put pointers in a transparent_union - when built with -arch ppc64. Complains: - warning: 'transparent_union' attribute ignored -*/ -#if defined(__GNUC__) && !defined(__cplusplus) && \ - ! (defined(__APPLE__) && defined(_ARCH_PPC64)) -/* - we want to be able to use my_atomic_xxx functions with - both signed and unsigned integers. But gcc will issue a warning - "passing arg N of `my_atomic_XXX' as [un]signed due to prototype" - if the signedness of the argument doesn't match the prototype, or - "pointer targets in passing argument N of my_atomic_XXX differ in signedness" - if int* is used where uint* is expected (or vice versa). - Let's shut these warnings up -*/ -#define make_transparent_unions(S) \ - typedef union { \ - int ## S i; \ - uint ## S u; \ - } U_ ## S __attribute__ ((transparent_union)); \ - typedef union { \ - int ## S volatile *i; \ - uint ## S volatile *u; \ - } Uv_ ## S __attribute__ ((transparent_union)); -#define uintptr intptr -make_transparent_unions(8) -make_transparent_unions(16) -make_transparent_unions(32) -make_transparent_unions(ptr) -#undef uintptr -#undef make_transparent_unions -#define a U_a.i -#define cmp U_cmp.i -#define v U_v.i -#define set U_set.i -#else -#define U_32 int32 -#define U_ptr intptr -#define Uv_32 int32 -#define Uv_ptr intptr -#define U_a volatile *a -#define U_cmp *cmp -#define U_v v -#define U_set set -#endif /* __GCC__ transparent_union magic */ - -#ifdef HAVE_INLINE - -#define make_atomic_cas(S) \ -STATIC_INLINE int my_atomic_cas ## S(Uv_ ## S U_a, \ - Uv_ ## S U_cmp, U_ ## S U_set) \ -{ \ - int8 ret; \ - make_atomic_cas_body(S); \ - return ret; \ -} - -#define make_atomic_add(S) \ -STATIC_INLINE int ## S my_atomic_add ## S( \ - Uv_ ## S U_a, U_ ## S U_v) \ -{ \ - make_atomic_add_body(S); \ - return v; \ -} - -#define make_atomic_fas(S) \ -STATIC_INLINE int ## S my_atomic_fas ## S( \ - Uv_ ## S U_a, U_ ## S U_v) \ -{ \ - make_atomic_fas_body(S); \ - return v; \ -} - -#define make_atomic_load(S) \ -STATIC_INLINE int ## S my_atomic_load ## S(Uv_ ## S U_a) \ -{ \ - int ## S ret; \ - make_atomic_load_body(S); \ - return ret; \ -} - -#define make_atomic_store(S) \ -STATIC_INLINE void my_atomic_store ## S( \ - Uv_ ## S U_a, U_ ## S U_v) \ -{ \ - make_atomic_store_body(S); \ -} - -#else /* no inline functions */ - -#define make_atomic_add(S) \ -extern int ## S my_atomic_add ## S(Uv_ ## S U_a, U_ ## S U_v); - -#define make_atomic_fas(S) \ -extern int ## S my_atomic_fas ## S(Uv_ ## S U_a, U_ ## S U_v); - -#define make_atomic_cas(S) \ -extern int my_atomic_cas ## S(Uv_ ## S U_a, Uv_ ## S U_cmp, U_ ## S U_set); - -#define make_atomic_load(S) \ -extern int ## S my_atomic_load ## S(Uv_ ## S U_a); - -#define make_atomic_store(S) \ -extern void my_atomic_store ## S(Uv_ ## S U_a, U_ ## S U_v); - -#endif - -make_atomic_cas(32) -make_atomic_cas(ptr) - -make_atomic_add(32) - -make_atomic_load(32) -make_atomic_load(ptr) - -make_atomic_fas(32) -make_atomic_fas(ptr) - -make_atomic_store(32) -make_atomic_store(ptr) - -#ifdef _atomic_h_cleanup_ -#include _atomic_h_cleanup_ -#undef _atomic_h_cleanup_ -#endif - -#undef U_32 -#undef U_ptr -#undef a -#undef cmp -#undef v -#undef set -#undef U_a -#undef U_cmp -#undef U_v -#undef U_set -#undef make_atomic_add -#undef make_atomic_cas -#undef make_atomic_load -#undef make_atomic_store -#undef make_atomic_fas -#undef make_atomic_add_body -#undef make_atomic_cas_body -#undef make_atomic_load_body -#undef make_atomic_store_body -#undef make_atomic_fas_body -#undef intptr - -/* - the macro below defines (as an expression) the code that - will be run in spin-loops. Intel manuals recummend to have PAUSE there. - It is expected to be defined in include/atomic/ *.h files -*/ -#ifndef LF_BACKOFF -#define LF_BACKOFF (1) -#endif - -#define MY_ATOMIC_OK 0 -#define MY_ATOMIC_NOT_1CPU 1 -extern int my_atomic_initialize(); - -#endif - |