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Use "rep; nop" in InnoDB if it is available and "pause" is not

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Vasil Dimov 2010-12-02 10:36:45 +02:00
commit 691bf28a56
1 changed files with 2 additions and 0 deletions
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storage/innobase/include/ut0ut.h
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@ -61,6 +61,8 @@ typedef time_t ib_time_t;
Also asm volatile may trigger a memory barrier (spilling all registers
to memory). */
# define UT_RELAX_CPU() __asm__ __volatile__ ("pause")
#elif defined(HAVE_FAKE_PAUSE_INSTRUCTION)
# define UT_RELAX_CPU() __asm__ __volatile__ ("rep; nop")
#elif defined(HAVE_ATOMIC_BUILTINS)
# define UT_RELAX_CPU() do { \
volatile lint volatile_var; \