NAME¶
ck_pr_cas_ptr,
ck_pr_cas_ptr_value,
ck_pr_cas_ptr_2,
ck_pr_cas_ptr_2_value,
ck_pr_cas_double,
ck_pr_cas_double_value,
ck_pr_cas_char,
ck_pr_cas_char_value,
ck_pr_cas_uint,
ck_pr_cas_uint_value,
ck_pr_cas_int,
ck_pr_cas_int_value,
ck_pr_cas_64_2,
ck_pr_cas_64_2_value,
ck_pr_cas_64,
ck_pr_cas_64_value,
ck_pr_cas_64_2,
ck_pr_cas_64_2_value,
ck_pr_cas_32,
ck_pr_cas_32_value,
ck_pr_cas_16,
ck_pr_cas_16_value,
ck_pr_cas_8,
ck_pr_cas_8_value —
atomic compare-and-swap operations
LIBRARY¶
Concurrency Kit (libck, -lck)
SYNOPSIS¶
#include
<ck_pr.h>
bool
ck_pr_cas_ptr(
void
*target,
void
*old_value,
void
*new_value);
bool
ck_pr_cas_ptr_value(
void
*target,
void
*old_value,
void
*new_value,
void
*original_value);
bool
ck_pr_cas_ptr_2(
void
*target,
void
*old_value,
void
*new_value);
bool
ck_pr_cas_ptr_2_value(
void
*target,
void
*old_value,
void
*new_value,
void
*original_value);
bool
ck_pr_cas_double(
double
*target,
double
old_value,
double
new_value);
bool
ck_pr_cas_double_value(
double
*target,
double
old_value,
double
new_value,
double
*original_value);
bool
ck_pr_cas_char(
char
*target,
char
old_value,
char
new_value);
bool
ck_pr_cas_char_value(
char
*target,
char
old_value,
char
new_value,
char
*original_value);
bool
ck_pr_cas_uint(
unsigned
int *target,
unsigned int
old_value,
unsigned int
new_value);
bool
ck_pr_cas_uint_value(
unsigned
int *target,
unsigned int
old_value,
unsigned int
new_value,
unsigned int
*original_value);
bool
ck_pr_cas_int(
int
*target,
int
old_value,
int
new_value);
bool
ck_pr_cas_int_value(
int
*target,
int
old_value,
int
new_value,
int
*original_value);
bool
ck_pr_cas_64_2(
uint64_t
target[static 2],
uint64_t
old_value[static 2],
uint64_t
new_value[static 2]);
bool
ck_pr_cas_64_2_value(
uint64_t
target[static 2],
uint64_t
old_value[static 2],
uint64_t
new_value[static 2],
uint64_t
original_value[static 2]);
bool
ck_pr_cas_64(
uint64_t
*target,
uint64_t
old_value,
uint64_t
new_value);
bool
ck_pr_cas_64_value(
uint64_t
*target,
uint64_t
old_value,
uint64_t
new_value,
uint64_t
*original_value);
bool
ck_pr_cas_64_2(
uint64_t
target[static 2],
uint64_t
old_value[static 2],
uint64_t
new_value[static 2]);
bool
ck_pr_cas_64_2_value(
uint64_t
target[static 2],
uint64_t
old_value[static 2],
uint64_t
new_value[static 2],
uint64_t
original_value[static 2]);
bool
ck_pr_cas_32(
uint32_t
*target,
uint32_t
old_value,
uint32_t
new_value);
bool
ck_pr_cas_32_value(
uint32_t
*target,
uint32_t
old_value,
uint32_t
new_value,
uint32_t
*original_value);
bool
ck_pr_cas_16(
uint16_t
*target,
uint16_t
old_value,
uint16_t
new_value);
bool
ck_pr_cas_16_value(
uint16_t
*target,
uint16_t
old_value,
uint16_t
new_value,
uint16_t
*original_value);
bool
ck_pr_cas_8(
uint8_t
*target,
uint8_t
old_value,
uint8_t
new_value);
bool
ck_pr_cas_8_value(
uint8_t
*target,
uint8_t
old_value,
uint8_t
new_value,
uint8_t
*original_value);
DESCRIPTION¶
The
ck_pr_cas(
3)
family of functions atomically compare the value in
target for equality with
old_value and if so, replace the value
pointed to by
target with the value specified
by
original_value. If the value in
target was not equal to the value specified
by
old_value then no modifications occur to
the value in
target. The *_value form of
these functions unconditionally update
original_value.
RETURN VALUES¶
This family of functions return true if the value in
target was modified as a result of the
operation. Otherwise, they return false.
SEE ALSO¶
ck_pr_fence_load(3),
ck_pr_fence_load_depends(3),
ck_pr_fence_store(3),
ck_pr_fence_memory(3),
ck_pr_load(3),
ck_pr_store(3),
ck_pr_fas(3),
ck_pr_faa(3),
ck_pr_inc(3),
ck_pr_dec(3),
ck_pr_neg(3),
ck_pr_not(3),
ck_pr_sub(3),
ck_pr_and(3),
ck_pr_or(3),
ck_pr_xor(3),
ck_pr_add(3),
ck_pr_btc(3),
ck_pr_bts(3),
ck_pr_btr(3)
Additional information available at
http://concurrencykit.org/
