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Code Issues Releases Wiki Activity

Remove ISC_PLATFORM_BUSYWAITNOP in favour of direct isc_rwlock_pause() define

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This commit is contained in:
Ondřej Surý
2018-09-04 12:26:39 +02:00
parent 376bea8b40
commit 22e5231f99
6 changed files with 22 additions and 226 deletions
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23
lib/isc/rwlock.c
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@@ -41,6 +41,25 @@
#define RWLOCK_MAX_ADAPTIVE_COUNT 100
#endif
#if defined(_MSC_VER)
# include <intrin.h>
# define isc_rwlock_pause() YieldProcessor()
#elif defined(__x86_64__) || defined(__i386__)
# include <immintrin.h>
# define isc_rwlock_pause() _mm_pause()
#elif defined(__ia64__)
# define isc_rwlock_pause() __asm__ __volatile__ ("hint @pause")
#elif defined(__arm__)
# define isc_rwlock_pause() __asm__ __volatile__ ("yield")
#elif defined(__sparc) || defined(__sparc__)
# define plasma_spin_pause() __asm__ __volatile__ ("pause")
#elif defined(__ppc__) || defined(_ARCH_PPC) || \
defined(_ARCH_PWR) || defined(_ARCH_PWR2) || defined(_POWER)
# define isc_rwlock_pause() __asm__ volatile ("or 27,27,27")
#else
# define isc_rwlock_pause()
#endif
static isc_result_t
isc__rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type);
@@ -350,9 +369,7 @@ isc_rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type) {
result = isc__rwlock_lock(rwl, type);
break;
}
#ifdef ISC_PLATFORM_BUSYWAITNOP
ISC_PLATFORM_BUSYWAITNOP;
#endif
isc_rwlock_pause();
} while (isc_rwlock_trylock(rwl, type) != ISC_R_SUCCESS);
rwl->spins += (cnt - rwl->spins) / 8;