mirror of
https://github.com/UberGames/RPG-X2.git
synced 2024-11-25 22:01:07 +00:00
254 lines
8.5 KiB
C
254 lines
8.5 KiB
C
/* 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
|
|
|