diff options
Diffstat (limited to 'deps/jemalloc/include/jemalloc/internal/spin.h')
-rw-r--r-- | deps/jemalloc/include/jemalloc/internal/spin.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/deps/jemalloc/include/jemalloc/internal/spin.h b/deps/jemalloc/include/jemalloc/internal/spin.h new file mode 100644 index 000000000..22804c687 --- /dev/null +++ b/deps/jemalloc/include/jemalloc/internal/spin.h @@ -0,0 +1,40 @@ +#ifndef JEMALLOC_INTERNAL_SPIN_H +#define JEMALLOC_INTERNAL_SPIN_H + +#define SPIN_INITIALIZER {0U} + +typedef struct { + unsigned iteration; +} spin_t; + +static inline void +spin_cpu_spinwait() { +# if HAVE_CPU_SPINWAIT + CPU_SPINWAIT; +# else + volatile int x = 0; + x = x; +# endif +} + +static inline void +spin_adaptive(spin_t *spin) { + volatile uint32_t i; + + if (spin->iteration < 5) { + for (i = 0; i < (1U << spin->iteration); i++) { + spin_cpu_spinwait(); + } + spin->iteration++; + } else { +#ifdef _WIN32 + SwitchToThread(); +#else + sched_yield(); +#endif + } +} + +#undef SPIN_INLINE + +#endif /* JEMALLOC_INTERNAL_SPIN_H */ |