TEST_AND_SET_BIT(9) Basic C Library Functions TEST_AND_SET_BIT(9)NAME
test_and_set_bit - Set a bit and return its old value
int test_and_set_bit(int nr, volatile unsigned long * addr);
Bit to set
Address to count from
This operation is atomic and cannot be reordered. It also implies a memory barrier.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 TEST_AND_SET_BIT(9)
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ATOMIC_DEC(3) BSD Library Functions Manual ATOMIC_DEC(3)NAME
atomic_dec, atomic_dec_32, atomic_dec_uint, atomic_dec_ulong, atomic_dec_ptr, atomic_dec_64, atomic_dec_32_nv, atomic_dec_uint_nv,
atomic_dec_ulong_nv, atomic_dec_ptr_nv, atomic_dec_64_nv -- atomic decrement operations
atomic_dec_32(volatile uint32_t *ptr);
atomic_dec_uint(volatile unsigned int *ptr);
atomic_dec_ulong(volatile unsigned long *ptr);
atomic_dec_ptr(volatile void *ptr);
atomic_dec_64(volatile uint64_t *ptr);
atomic_dec_32_nv(volatile uint32_t *ptr);
atomic_dec_uint_nv(volatile unsigned int *ptr);
atomic_dec_ulong_nv(volatile unsigned long *ptr);
atomic_dec_ptr_nv(volatile void *ptr);
atomic_dec_64_nv(volatile uint64_t *ptr);
The atomic_dec family of functions decrement (by one) the variable referenced by ptr in an atomic fashion.
The *_nv() variants of these functions return the new value.
The 64-bit variants of these functions are available only on platforms that can support atomic 64-bit memory access. Applications can check
for the availability of 64-bit atomic memory operations by testing if the pre-processor macro __HAVE_ATOMIC64_OPS is defined.
SEE ALSO atomic_ops(3)HISTORY
The atomic_dec functions first appeared in NetBSD 5.0.
BSD April 11, 2007 BSD
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