diff options
| -rw-r--r-- | man2/futex.2 | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/man2/futex.2 b/man2/futex.2 index 389c25224b..ada96c517d 100644 --- a/man2/futex.2 +++ b/man2/futex.2 @@ -25,18 +25,22 @@ futex \- fast user-space locking .SH SYNOPSIS .nf .PP -.B #include <linux/futex.h> -.B #include <stdint.h> -.B #include <sys/time.h> +.BR "#include <linux/futex.h>" " /* Definition of " FUTEX_* " constants */" +.BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */" +.B #include <unistd.h> .PP -.BI "long futex(uint32_t *" uaddr ", int " futex_op ", uint32_t " val , -.BI " const struct timespec *" timeout , \ +.BI "long syscall(SYS_futex, uint32_t *" uaddr ", int " futex_op \ +", uint32_t " val , +.BI " const struct timespec *" timeout , \ " \fR /* or: \fBuint32_t \fIval2\fP */" -.BI " uint32_t *" uaddr2 ", uint32_t " val3 ); +.BI " uint32_t *" uaddr2 ", uint32_t " val3 ); .fi .PP .IR Note : -There is no glibc wrapper for this system call; see NOTES. +glibc provides no wrapper for +.BR futex (), +necessitating the use of +.BR syscall (2). .SH DESCRIPTION The .BR futex () @@ -1695,9 +1699,6 @@ and a sixth argument was added in Linux 2.6.7. .SH CONFORMING TO This system call is Linux-specific. .SH NOTES -Glibc does not provide a wrapper for this system call; call it using -.BR syscall (2). -.PP Several higher-level programming abstractions are implemented via futexes, including POSIX semaphores and various POSIX threads synchronization mechanisms |