mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-02-01 11:31:51 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

branches/zip: fix PAUSE instruction patch on Windows

Browse source 
The original PAUSE instruction patch (r5470) does not
compile on Windows. Also, there is an elegant way of
doing it on Windows - YieldProcessor().

Approved by: Heikki (on IM)
This commit is contained in:
calvin 2009-07-08 15:42:28 +00:00
parent 6e6d1e8655
commit e0d67bc470
1 changed files with 12 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
include/ut0ut.h
View file

@ -41,11 +41,18 @@ Created 1/20/1994 Heikki Tuuri
typedef time_t ib_time_t;
#if defined(IB_HAVE_PAUSE_INSTRUCTION)
/* According to the gcc info page, asm volatile means that the
instruction has important side-effects and must not be removed.
Also asm volatile may trigger a memory barrier (spilling all registers
to memory). */
# define UT_RELAX_CPU() __asm__ __volatile__ ("pause")
# ifdef WIN32
/* In the Win32 API, the x86 PAUSE instruction is executed by calling
the YieldProcessor macro defined in WinNT.h. It is a CPU architecture-
independent way by using YieldProcessor.*/
# define UT_RELAX_CPU() YieldProcessor()
# else
/* According to the gcc info page, asm volatile means that the
instruction has important side-effects and must not be removed.
Also asm volatile may trigger a memory barrier (spilling all registers
to memory). */
# define UT_RELAX_CPU() __asm__ __volatile__ ("pause")
# endif
#elif defined(HAVE_ATOMIC_BUILTINS)
# define UT_RELAX_CPU() do { \
volatile lint volatile_var; \