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ck_pr_cas(3)	       FreeBSD Library Functions Manual		  ck_pr_cas(3)

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_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_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 new_value.  If the value in
     target was	not equal to the value specified by old_value then no modifi-
     cations occur to the value	in target.  The	*_value	form of	these func-
     tions 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/

				April 11, 2013

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO

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