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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - tools/perf/bench/futex.h
2 * Glibc independent futex library for testing kernel functionality.
3 * Shamelessly stolen from Darren Hart <dvhltc@us.ibm.com>
4 * http://git.kernel.org/cgit/linux/kernel/git/dvhart/futextest.git/
11 #include <sys/syscall.h>
12 #include <sys/types.h>
13 #include <linux/futex.h>
16 * futex() - SYS_futex syscall wrapper
17 * @uaddr: address of first futex
19 * @val: typically expected value of uaddr, but varies by op
20 * @timeout: typically an absolute struct timespec (except where noted
21 * otherwise). Overloaded by some ops
22 * @uaddr2: address of second futex for some ops\
24 * @opflags: flags to be bitwise OR'd with op, such as FUTEX_PRIVATE_FLAG
26 * futex() is used by all the following futex op wrappers. It can also be
27 * used for misuse and abuse testing. Generally, the specific op wrappers
28 * should be used instead. It is a macro instead of an static inline function as
29 * some of the types over overloaded (timeout is used for nr_requeue for
32 * These argument descriptions are the defaults for all
33 * like-named arguments in the following wrappers except where noted below.
35 #define futex(uaddr, op, val, timeout, uaddr2, val3, opflags) \
36 syscall(SYS_futex, uaddr, op | opflags, val, timeout, uaddr2, val3)
39 * futex_wait() - block on uaddr with optional timeout
40 * @timeout: relative timeout
43 futex_wait(u_int32_t
*uaddr
, u_int32_t val
, struct timespec
*timeout
, int opflags
)
45 return futex(uaddr
, FUTEX_WAIT
, val
, timeout
, NULL
, 0, opflags
);
49 * futex_wake() - wake one or more tasks blocked on uaddr
50 * @nr_wake: wake up to this many tasks
53 futex_wake(u_int32_t
*uaddr
, int nr_wake
, int opflags
)
55 return futex(uaddr
, FUTEX_WAKE
, nr_wake
, NULL
, NULL
, 0, opflags
);
59 * futex_lock_pi() - block on uaddr as a PI mutex
60 * @detect: whether (1) or not (0) to perform deadlock detection
63 futex_lock_pi(u_int32_t
*uaddr
, struct timespec
*timeout
, int detect
,
66 return futex(uaddr
, FUTEX_LOCK_PI
, detect
, timeout
, NULL
, 0, opflags
);
70 * futex_unlock_pi() - release uaddr as a PI mutex, waking the top waiter
73 futex_unlock_pi(u_int32_t
*uaddr
, int opflags
)
75 return futex(uaddr
, FUTEX_UNLOCK_PI
, 0, NULL
, NULL
, 0, opflags
);
79 * futex_cmp_requeue() - requeue tasks from uaddr to uaddr2
80 * @nr_wake: wake up to this many tasks
81 * @nr_requeue: requeue up to this many tasks
84 futex_cmp_requeue(u_int32_t
*uaddr
, u_int32_t val
, u_int32_t
*uaddr2
, int nr_wake
,
85 int nr_requeue
, int opflags
)
87 return futex(uaddr
, FUTEX_CMP_REQUEUE
, nr_wake
, nr_requeue
, uaddr2
,
91 #ifndef HAVE_PTHREAD_ATTR_SETAFFINITY_NP
93 static inline int pthread_attr_setaffinity_np(pthread_attr_t
*attr
,
98 cpusetsize
= cpusetsize
;
104 #endif /* _FUTEX_H */