1 /* 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/ 5 */ 6 7 #ifndef _FUTEX_H 8 #define _FUTEX_H 9 10 #include <unistd.h> 11 #include <sys/syscall.h> 12 #include <sys/types.h> 13 #include <linux/futex.h> 14 15 /** 16 * futex() - SYS_futex syscall wrapper 17 * @uaddr: address of first futex 18 * @op: futex op code 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\ 23 * @val3: varies by op 24 * @opflags: flags to be bitwise OR'd with op, such as FUTEX_PRIVATE_FLAG 25 * 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 30 * example). 31 * 32 * These argument descriptions are the defaults for all 33 * like-named arguments in the following wrappers except where noted below. 34 */ 35 #define futex(uaddr, op, val, timeout, uaddr2, val3, opflags) \ 36 syscall(SYS_futex, uaddr, op | opflags, val, timeout, uaddr2, val3) 37 38 /** 39 * futex_wait() - block on uaddr with optional timeout 40 * @timeout: relative timeout 41 */ 42 static inline int 43 futex_wait(u_int32_t *uaddr, u_int32_t val, struct timespec *timeout, int opflags) 44 { 45 return futex(uaddr, FUTEX_WAIT, val, timeout, NULL, 0, opflags); 46 } 47 48 /** 49 * futex_wake() - wake one or more tasks blocked on uaddr 50 * @nr_wake: wake up to this many tasks 51 */ 52 static inline int 53 futex_wake(u_int32_t *uaddr, int nr_wake, int opflags) 54 { 55 return futex(uaddr, FUTEX_WAKE, nr_wake, NULL, NULL, 0, opflags); 56 } 57 58 /** 59 * futex_cmp_requeue() - requeue tasks from uaddr to uaddr2 60 * @nr_wake: wake up to this many tasks 61 * @nr_requeue: requeue up to this many tasks 62 */ 63 static inline int 64 futex_cmp_requeue(u_int32_t *uaddr, u_int32_t val, u_int32_t *uaddr2, int nr_wake, 65 int nr_requeue, int opflags) 66 { 67 return futex(uaddr, FUTEX_CMP_REQUEUE, nr_wake, nr_requeue, uaddr2, 68 val, opflags); 69 } 70 71 #ifndef HAVE_PTHREAD_ATTR_SETAFFINITY_NP 72 #include <pthread.h> 73 static inline int pthread_attr_setaffinity_np(pthread_attr_t *attr, 74 size_t cpusetsize, 75 cpu_set_t *cpuset) 76 { 77 attr = attr; 78 cpusetsize = cpusetsize; 79 cpuset = cpuset; 80 return 0; 81 } 82 #endif 83 84 #endif /* _FUTEX_H */ 85