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osd_work: use the non-yield implementation of spin_while() for all platforms (nw)

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futher tests have shown there is no actual speed difference - and it
reduces the CPU load even more
This commit is contained in:
Oliver Stöneberg 2015-01-07 16:42:16 +01:00
parent d3b6b803f3
commit 143caa2616
1 changed files with 0 additions and 29 deletions
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29
src/osd/modules/sync/work_osd.c
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@ -76,48 +76,19 @@ typedef void *PVOID;
#define end_timing(v) do { } while (0) #define end_timing(v) do { } while (0)
#endif #endif
// TODO: move this in a common place
#if defined(OSD_WINDOWS)
#if __GNUC__ && defined(__i386__) && !defined(__x86_64)
#undef YieldProcessor
#endif
#ifndef YieldProcessor
#ifdef __GNUC__
INLINE void osd_yield_processor(void)
{
__asm__ __volatile__ ( "rep; nop" );
}
#else
INLINE void osd_yield_processor(void)
{
__asm { rep nop }
}
#endif
#else
#define osd_yield_processor YieldProcessor
#endif
#endif
template<typename _PtrType> template<typename _PtrType>
static void spin_while(const volatile _PtrType * volatile ptr, const _PtrType val, const osd_ticks_t timeout, const int invert = 0) static void spin_while(const volatile _PtrType * volatile ptr, const _PtrType val, const osd_ticks_t timeout, const int invert = 0)
{ {
osd_ticks_t stopspin = osd_ticks() + timeout; osd_ticks_t stopspin = osd_ticks() + timeout;
#if defined(OSD_WINDOWS)
while (((*ptr == val) ^ invert) && osd_ticks() < stopspin)
osd_yield_processor();
#else
do { do {
int spin = 10000; int spin = 10000;
while (--spin) while (--spin)
{ {
//osd_yield_processor();
if ((*ptr == val) ^ invert) if ((*ptr == val) ^ invert)
return; return;
} }
} while (((*ptr == val) ^ invert) && osd_ticks() < stopspin); } while (((*ptr == val) ^ invert) && osd_ticks() < stopspin);
#endif
} }
template<typename _PtrType> template<typename _PtrType>