9737685943
Add spin_t and spin_{init,adaptive}(), which provide a simple
abstraction for adaptive spinning.
Adaptively spin during busy waits in bootstrapping and rtree node
initialization.
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/******************************************************************************/
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#ifdef JEMALLOC_H_TYPES
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typedef struct spin_s spin_t;
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#endif /* JEMALLOC_H_TYPES */
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/******************************************************************************/
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#ifdef JEMALLOC_H_STRUCTS
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struct spin_s {
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unsigned iteration;
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};
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#endif /* JEMALLOC_H_STRUCTS */
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/******************************************************************************/
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#ifdef JEMALLOC_H_EXTERNS
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#endif /* JEMALLOC_H_EXTERNS */
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/******************************************************************************/
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#ifdef JEMALLOC_H_INLINES
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#ifndef JEMALLOC_ENABLE_INLINE
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void spin_init(spin_t *spin);
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void spin_adaptive(spin_t *spin);
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#endif
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#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_SPIN_C_))
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JEMALLOC_INLINE void
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spin_init(spin_t *spin)
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{
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spin->iteration = 0;
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}
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JEMALLOC_INLINE void
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spin_adaptive(spin_t *spin)
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{
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volatile uint64_t i;
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for (i = 0; i < (KQU(1) << spin->iteration); i++)
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CPU_SPINWAIT;
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if (spin->iteration < 63)
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spin->iteration++;
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}
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#endif
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#endif /* JEMALLOC_H_INLINES */
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/******************************************************************************/
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