1atomic_cas(3C)           Standard C Library Functions           atomic_cas(3C)
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NAME

6       atomic_cas,      atomic_cas_8,     atomic_cas_uchar,     atomic_cas_16,
7       atomic_cas_ushort,  atomic_cas_32,  atomic_cas_uint,  atomic_cas_ulong,
8       atomic_cas_64, atomic_cas_ptr - atomic compare and swap operations
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SYNOPSIS

11       #include <atomic.h>
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13       uint8_t atomic_cas_8(volatile uint8_t *target, uint8_t cmp,
14            uint8_t newval);
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17       uchar_t atomic_cas_uchar(volatile uchar_t *target, uchar_t cmp,
18            uchar_t newval);
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21       uint16_t atomic_cas_16(volatile uint16_t *target, uint16_t cmp,
22            uint16_t newval);
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25       ushort_t atomic_cas_ushort(volatile ushort_t *target, ushort_t cmp,
26            ushort_t newval);
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29       uint32_t atomic_cas_32(volatile uint32_t *target, uint32_t cmp,
30            uint32_t newval);
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33       uint_t atomic_cas_uint(volatile uint_t *target, uint_t cmp,
34            uint_t newval);
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37       ulong_t atomic_cas_ulong(volatile ulong_t *target, ulong_t cmp,
38            ulong_t newval);
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41       uint64_t atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
42            uint64_t newval);
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45       void *atomic_cas_ptr(volatile void *target, void *cmp,
46            void *newval);
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DESCRIPTION

50       These  functions  enable  a  compare and swap operation to occur atomi‐
51       cally. The value stored in target is compared with cmp. If these values
52       are  equal, the value stored in target is replaced with newval. The old
53       value stored in target is returned by the function whether or  not  the
54       replacement occurred.
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RETURN VALUES

57       These functions return the old value of *target.
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ERRORS

60       No errors are defined.
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ATTRIBUTES

63       See attributes(5) for descriptions of the following attributes:
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68       ┌─────────────────────────────┬─────────────────────────────┐
69       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
70       ├─────────────────────────────┼─────────────────────────────┤
71       │Interface Stability          │Committed                    │
72       ├─────────────────────────────┼─────────────────────────────┤
73       │MT-Level                     │MT-Safe                      │
74       └─────────────────────────────┴─────────────────────────────┘
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SEE ALSO

77       atomic_add(3C),    atomic_and(3C),   atomic_bits(3C),   atomic_dec(3C),
78       atomic_inc(3C),   atomic_or(3C),    atomic_swap(3C),    membar_ops(3C),
79       attributes(5), atomic_ops(9F)
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83SunOS 5.11                        13 May 2005                   atomic_cas(3C)
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