41 lines
617 B
C
41 lines
617 B
C
#ifndef JEMALLOC_INTERNAL_SPIN_H
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#define JEMALLOC_INTERNAL_SPIN_H
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#define SPIN_INITIALIZER {0U}
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typedef struct {
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unsigned iteration;
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} spin_t;
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static inline void
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spin_cpu_spinwait(void) {
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# if HAVE_CPU_SPINWAIT
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CPU_SPINWAIT;
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# else
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volatile int x = 0;
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x = x;
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# endif
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}
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static inline void
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spin_adaptive(spin_t *spin) {
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volatile uint32_t i;
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if (spin->iteration < 5) {
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for (i = 0; i < (1U << spin->iteration); i++) {
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spin_cpu_spinwait();
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}
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spin->iteration++;
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} else {
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#ifdef _WIN32
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SwitchToThread();
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#else
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sched_yield();
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#endif
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}
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}
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#undef SPIN_INLINE
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#endif /* JEMALLOC_INTERNAL_SPIN_H */
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