qed: Fix static checker warning
[linux/fpc-iii.git] / tools / perf / bench / futex.h
blobdb4853f209c7665bc2bc86fa786225fb1a9bfa5d
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
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/
6 */
8 #ifndef _FUTEX_H
9 #define _FUTEX_H
11 #include <unistd.h>
12 #include <sys/syscall.h>
13 #include <sys/types.h>
14 #include <linux/futex.h>
16 /**
17 * futex() - SYS_futex syscall wrapper
18 * @uaddr: address of first futex
19 * @op: futex op code
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\
24 * @val3: varies by op
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
31 * example).
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)
39 /**
40 * futex_wait() - block on uaddr with optional timeout
41 * @timeout: relative timeout
43 static inline int
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);
49 /**
50 * futex_wake() - wake one or more tasks blocked on uaddr
51 * @nr_wake: wake up to this many tasks
53 static inline int
54 futex_wake(u_int32_t *uaddr, int nr_wake, int opflags)
56 return futex(uaddr, FUTEX_WAKE, nr_wake, NULL, NULL, 0, opflags);
59 /**
60 * futex_lock_pi() - block on uaddr as a PI mutex
62 static inline int
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);
68 /**
69 * futex_unlock_pi() - release uaddr as a PI mutex, waking the top waiter
71 static inline int
72 futex_unlock_pi(u_int32_t *uaddr, int opflags)
74 return futex(uaddr, FUTEX_UNLOCK_PI, 0, NULL, NULL, 0, opflags);
77 /**
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
82 static inline int
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,
87 val, opflags);
90 #ifndef HAVE_PTHREAD_ATTR_SETAFFINITY_NP
91 #include <pthread.h>
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)
97 return 0;
99 #endif
101 #endif /* _FUTEX_H */