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futex.h [8d2dd7f2:d5c1051] in mainline

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r8d2dd7f2	rd5c1051
37	37
38	38	#include <atomic.h>
	39	#include <errno.h>
39	40	#include <libc.h>
40	41
…	…
107	108	* @param futex Futex.
108	109	*
109		* @return ~~Non-zero~~ if the futex was acquired.
110		* @return ~~Zero~~ if the futex was not acquired.
	110	* @return true if the futex was acquired.
	111	* @return false if the futex was not acquired.
111	112	*
112	113	*/
113		static inline ~~int~~ futex_trydown(futex_t *futex)
	114	static inline bool futex_trydown(futex_t *futex)
114	115	{
115	116	return cas(&futex->val, 1, 0);
…	…
121	122	*
122	123	* @return ENOENT if there is no such virtual address.
123		* @return ~~Zero in the uncontended case~~.
124		* @return ~~Otherwise one of ESYNCH_OK_ATOMIC or ESYNCH_OK_BLOCKED~~.
	124	* @return EOK on success.
	125	* @return Error code from <errno.h> otherwise.
125	126	*
126	127	*/
…	…
128	129	{
129	130	if ((atomic_signed_t) atomic_predec(&futex->val) < 0)
130		return __SYSCALL1(SYS_FUTEX_SLEEP, (sysarg_t) &futex->val.count);
	131	return (int) __SYSCALL1(SYS_FUTEX_SLEEP, (sysarg_t) &futex->val.count);
131	132
132		return 0;
	133	return EOK;
133	134	}
134	135
…	…
138	139	*
139	140	* @return ENOENT if there is no such virtual address.
140		* @return Zero in the uncontended case.
	141	* @return EOK on success.
	142	* @return Error code from <errno.h> otherwise.
141	143	*
142	144	*/
…	…
144	146	{
145	147	if ((atomic_signed_t) atomic_postinc(&futex->val) < 0)
146		return __SYSCALL1(SYS_FUTEX_WAKEUP, (sysarg_t) &futex->val.count);
	148	return (int) __SYSCALL1(SYS_FUTEX_WAKEUP, (sysarg_t) &futex->val.count);
147	149
148		return 0;
	150	return EOK;
149	151	}
150	152

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