1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Glibc independent futex library for testing kernel functionality.
4 * Shamelessly stolen from Darren Hart <dvhltc@us.ibm.com>
5 * http://git.kernel.org/cgit/linux/kernel/git/dvhart/futextest.git/
12 #include <sys/syscall.h>
13 #include <sys/types.h>
14 #include <linux/futex.h>
17 * futex() - SYS_futex syscall wrapper
18 * @uaddr: address of first futex
20 * @val: typically expected value of uaddr, but varies by op
21 * @timeout: typically an absolute struct timespec (except where noted
22 * otherwise). Overloaded by some ops
23 * @uaddr2: address of second futex for some ops\
25 * @opflags: flags to be bitwise OR'd with op, such as FUTEX_PRIVATE_FLAG
27 * futex() is used by all the following futex op wrappers. It can also be
28 * used for misuse and abuse testing. Generally, the specific op wrappers
29 * should be used instead. It is a macro instead of an static inline function as
30 * some of the types over overloaded (timeout is used for nr_requeue for
33 * These argument descriptions are the defaults for all
34 * like-named arguments in the following wrappers except where noted below.
36 #define futex(uaddr, op, val, timeout, uaddr2, val3, opflags) \
37 syscall(SYS_futex, uaddr, op | opflags, val, timeout, uaddr2, val3)
40 * futex_wait() - block on uaddr with optional timeout
41 * @timeout: relative timeout
44 futex_wait(u_int32_t
*uaddr
, u_int32_t val
, struct timespec
*timeout
, int opflags
)
46 return futex(uaddr
, FUTEX_WAIT
, val
, timeout
, NULL
, 0, opflags
);
50 * futex_wake() - wake one or more tasks blocked on uaddr
51 * @nr_wake: wake up to this many tasks
54 futex_wake(u_int32_t
*uaddr
, int nr_wake
, int opflags
)
56 return futex(uaddr
, FUTEX_WAKE
, nr_wake
, NULL
, NULL
, 0, opflags
);
60 * futex_lock_pi() - block on uaddr as a PI mutex
63 futex_lock_pi(u_int32_t
*uaddr
, struct timespec
*timeout
, int opflags
)
65 return futex(uaddr
, FUTEX_LOCK_PI
, 0, timeout
, NULL
, 0, opflags
);
69 * futex_unlock_pi() - release uaddr as a PI mutex, waking the top waiter
72 futex_unlock_pi(u_int32_t
*uaddr
, int opflags
)
74 return futex(uaddr
, FUTEX_UNLOCK_PI
, 0, NULL
, NULL
, 0, opflags
);
78 * futex_cmp_requeue() - requeue tasks from uaddr to uaddr2
79 * @nr_wake: wake up to this many tasks
80 * @nr_requeue: requeue up to this many tasks
83 futex_cmp_requeue(u_int32_t
*uaddr
, u_int32_t val
, u_int32_t
*uaddr2
, int nr_wake
,
84 int nr_requeue
, int opflags
)
86 return futex(uaddr
, FUTEX_CMP_REQUEUE
, nr_wake
, nr_requeue
, uaddr2
,
90 #ifndef HAVE_PTHREAD_ATTR_SETAFFINITY_NP
92 #include <linux/compiler.h>
93 static inline int pthread_attr_setaffinity_np(pthread_attr_t
*attr __maybe_unused
,
94 size_t cpusetsize __maybe_unused
,
95 cpu_set_t
*cpuset __maybe_unused
)
101 #endif /* _FUTEX_H */