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nexedi
MariaDB
Commits
1c3442e2
Commit
1c3442e2
authored
Dec 10, 2008
by
Mikael Ronstrom
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Added a PAUSE instruction to the SPIN loop
according to recommendation from Intel.
parent
cad9fe0c
Changes
3
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3 changed files
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26 additions
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+26
-0
configure.in
configure.in
+11
-0
storage/innobase/include/ut0ut.h
storage/innobase/include/ut0ut.h
+13
-0
storage/innobase/ut/ut0ut.c
storage/innobase/ut/ut0ut.c
+2
-0
No files found.
configure.in
View file @
1c3442e2
...
@@ -2342,6 +2342,17 @@ fi
...
@@ -2342,6 +2342,17 @@ fi
fi
fi
#---END:
#---END:
#Check for x86 PAUSE instruction
AC_MSG_CHECKING("for x86 PAUSE instruction")
AC_TRY_COMPILE(
[],
[{__asm__ __volatile__ ("pause");}],
x86_pause_exists=yes, x86_pause_exists=no)
if test "$x86_pause_exists" = "yes"
then
AC_DEFINE([HAVE_PAUSE_INSTRUCTION], [1], [Does x86 PAUSE instruction exist])
fi
# Check if pthread_attr_setscope() exists
# Check if pthread_attr_setscope() exists
AC_CACHE_CHECK("for pthread_attr_setscope", mysql_cv_pthread_attr_setscope,
AC_CACHE_CHECK("for pthread_attr_setscope", mysql_cv_pthread_attr_setscope,
AC_TRY_LINK(
AC_TRY_LINK(
...
...
storage/innobase/include/ut0ut.h
View file @
1c3442e2
...
@@ -17,6 +17,19 @@ Created 1/20/1994 Heikki Tuuri
...
@@ -17,6 +17,19 @@ Created 1/20/1994 Heikki Tuuri
typedef
time_t
ib_time_t
;
typedef
time_t
ib_time_t
;
#ifdef HAVE_PAUSE_INSTRUCTION
#define PAUSE_INSTRUCTION(volatile_var) {__asm__ __volatile__ ("pause");}
#elif
#ifdef UNIV_SYNC_ATOMIC
#define PAUSE_INSTRUCTION(volatile_var) \
{ \
os_compare_and_swap(volatile_var, 0, 1); \
}
#elif
#define PAUSE_INSTRUCTION(volatile_var)
#endif
#endif
/************************************************************
/************************************************************
Gets the high 32 bits in a ulint. That is makes a shift >> 32,
Gets the high 32 bits in a ulint. That is makes a shift >> 32,
but since there seem to be compiler bugs in both gcc and Visual C++,
but since there seem to be compiler bugs in both gcc and Visual C++,
...
...
storage/innobase/ut/ut0ut.c
View file @
1c3442e2
...
@@ -336,11 +336,13 @@ ut_delay(
...
@@ -336,11 +336,13 @@ ut_delay(
ulint
delay
)
/* in: delay in microseconds on 100 MHz Pentium */
ulint
delay
)
/* in: delay in microseconds on 100 MHz Pentium */
{
{
ulint
i
,
j
;
ulint
i
,
j
;
volatile
lint
volatile_var
;
j
=
0
;
j
=
0
;
for
(
i
=
0
;
i
<
delay
*
50
;
i
++
)
{
for
(
i
=
0
;
i
<
delay
*
50
;
i
++
)
{
j
+=
i
;
j
+=
i
;
PAUSE_INSTRUCTION
(
&
volatile_var
);
}
}
if
(
ut_always_false
)
{
if
(
ut_always_false
)
{
...
...
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