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#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 */
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