atomic_swap_uchar(9f)

1atomic_swap(9F)          Kernel Functions for Drivers          atomic_swap(9F)
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NAME

6       atomic_swap,    atomic_swap_8,    atomic_swap_uchar,    atomic_swap_16,
7       atomic_swap_ushort,          atomic_swap_32,          atomic_swap_uint,
8       atomic_swap_ulong, atomic_swap_64, atomic_swap_ptr - atomic swap opera‐
9       tions
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SYNOPSIS

12       #include <sys/atomic.h>
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14       uint8_t atomic_swap_8(volatile uint8_t *target, uint8_t newval);
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17       uchar_t atomic_swap_uchar(volatile uchar_t *target, uchar_t newval);
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20       uint16_t atomic_swap_16(volatile uint16_t *target, uint16_t newval);
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23       ushort_t atomic_swap_ushort(volatile ushort_t *target, ushort_t newval);
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26       uint32_t atomic_swap_32(volatile uint32_t *target, uint32_t newval);
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29       uint_t atomic_swap_uint(volatile uint_t *target, uint_t newval);
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32       ulong_t atomic_swap_ulong(volatile ulong_t *target, ulong_t newval);
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35       uint64_t atomic_swap_64(volatile uint64_t *target, uint64_t newval);
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38       void *atomic_swap_ptr(volatile void *target, void *newval);
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DESCRIPTION

42       These functions enable a swap operation to occur atomically. The  value
43       stored  in target is replaced with newval. The old value is returned by
44       the function.
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RETURN VALUES

47       These functions return the old of *target.
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ERRORS

50       No errors are defined.
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CONTEXT

53       These functions can be called from user, interrupt, or kernel context.
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ATTRIBUTES

56       See attributes(5) for descriptions of the following attributes:
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61       ┌─────────────────────────────┬─────────────────────────────┐
62       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
63       ├─────────────────────────────┼─────────────────────────────┤
64       │Interface Stability          │Committed                    │
65       └─────────────────────────────┴─────────────────────────────┘
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