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73b1794e25
Given that the 'val' parameter is ignored for FUTEX_LOCK_PI, get rid of the bogus deadlock detection flag in the wrapper code and avoid the extra argument, making it resemble its unlock counterpart. And if nothing else, we already only pass 0 anyway. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Cc: Davidlohr Bueso <dbueso@suse.de> Link: http://lkml.kernel.org/r/1461208447-29328-1-git-send-email-dave@stgolabs.net Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*
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* Glibc independent futex library for testing kernel functionality.
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* Shamelessly stolen from Darren Hart <dvhltc@us.ibm.com>
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* http://git.kernel.org/cgit/linux/kernel/git/dvhart/futextest.git/
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*/
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#ifndef _FUTEX_H
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#define _FUTEX_H
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <linux/futex.h>
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/**
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* futex() - SYS_futex syscall wrapper
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* @uaddr: address of first futex
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* @op: futex op code
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* @val: typically expected value of uaddr, but varies by op
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* @timeout: typically an absolute struct timespec (except where noted
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* otherwise). Overloaded by some ops
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* @uaddr2: address of second futex for some ops\
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* @val3: varies by op
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* @opflags: flags to be bitwise OR'd with op, such as FUTEX_PRIVATE_FLAG
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*
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* futex() is used by all the following futex op wrappers. It can also be
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* used for misuse and abuse testing. Generally, the specific op wrappers
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* should be used instead. It is a macro instead of an static inline function as
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* some of the types over overloaded (timeout is used for nr_requeue for
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* example).
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*
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* These argument descriptions are the defaults for all
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* like-named arguments in the following wrappers except where noted below.
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*/
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#define futex(uaddr, op, val, timeout, uaddr2, val3, opflags) \
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syscall(SYS_futex, uaddr, op | opflags, val, timeout, uaddr2, val3)
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/**
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* futex_wait() - block on uaddr with optional timeout
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* @timeout: relative timeout
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*/
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static inline int
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futex_wait(u_int32_t *uaddr, u_int32_t val, struct timespec *timeout, int opflags)
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{
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return futex(uaddr, FUTEX_WAIT, val, timeout, NULL, 0, opflags);
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}
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/**
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* futex_wake() - wake one or more tasks blocked on uaddr
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* @nr_wake: wake up to this many tasks
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*/
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static inline int
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futex_wake(u_int32_t *uaddr, int nr_wake, int opflags)
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{
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return futex(uaddr, FUTEX_WAKE, nr_wake, NULL, NULL, 0, opflags);
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}
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/**
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* futex_lock_pi() - block on uaddr as a PI mutex
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*/
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static inline int
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futex_lock_pi(u_int32_t *uaddr, struct timespec *timeout, int opflags)
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{
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return futex(uaddr, FUTEX_LOCK_PI, 0, timeout, NULL, 0, opflags);
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}
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/**
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* futex_unlock_pi() - release uaddr as a PI mutex, waking the top waiter
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*/
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static inline int
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futex_unlock_pi(u_int32_t *uaddr, int opflags)
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{
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return futex(uaddr, FUTEX_UNLOCK_PI, 0, NULL, NULL, 0, opflags);
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}
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/**
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* futex_cmp_requeue() - requeue tasks from uaddr to uaddr2
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* @nr_wake: wake up to this many tasks
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* @nr_requeue: requeue up to this many tasks
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*/
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static inline int
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futex_cmp_requeue(u_int32_t *uaddr, u_int32_t val, u_int32_t *uaddr2, int nr_wake,
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int nr_requeue, int opflags)
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{
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return futex(uaddr, FUTEX_CMP_REQUEUE, nr_wake, nr_requeue, uaddr2,
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val, opflags);
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}
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#ifndef HAVE_PTHREAD_ATTR_SETAFFINITY_NP
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#include <pthread.h>
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static inline int pthread_attr_setaffinity_np(pthread_attr_t *attr,
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size_t cpusetsize,
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cpu_set_t *cpuset)
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{
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attr = attr;
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cpusetsize = cpusetsize;
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cpuset = cpuset;
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return 0;
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}
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#endif
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#endif /* _FUTEX_H */
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