mirror of https://github.com/mkerrisk/man-pages
membarrier.2: Use syscall(SYS_...); for system calls without a wrapper
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -28,13 +28,20 @@ membarrier \- issue memory barriers on a set of threads
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.SH SYNOPSIS
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.SH SYNOPSIS
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.nf
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.nf
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.PP
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.PP
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.B #include <linux/membarrier.h>
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.BR "#include <linux/membarrier.h>" \
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" /* Definition of " MEMBARRIER_* " constants */"
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.BR "#include <sys/syscall.h>" " /* Definition of " SYS_* " constants */"
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.B #include <unistd.h>
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.PP
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.PP
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.BI "int membarrier(int " cmd ", unsigned int " flags ", int " cpu_id );
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.BI "int syscall(SYS_membarrier, int " cmd ", unsigned int " flags \
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", int " cpu_id );
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.fi
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.fi
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.PP
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.PP
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.IR Note :
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.IR Note :
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There is no glibc wrapper for this system call; see NOTES.
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glibc provides no wrapper for
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.BR membarrier (),
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necessitating the use of
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.BR syscall (2).
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.SH DESCRIPTION
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.SH DESCRIPTION
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The
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The
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.BR membarrier ()
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.BR membarrier ()
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@ -322,9 +329,6 @@ Examples where
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.BR membarrier ()
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.BR membarrier ()
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can be useful include implementations
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can be useful include implementations
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of Read-Copy-Update libraries and garbage collectors.
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of Read-Copy-Update libraries and garbage collectors.
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.PP
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Glibc does not provide a wrapper for this system call; call it using
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.BR syscall (2).
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.SH EXAMPLES
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.SH EXAMPLES
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Assuming a multithreaded application where "fast_path()" is executed
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Assuming a multithreaded application where "fast_path()" is executed
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very frequently, and where "slow_path()" is executed infrequently, the
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very frequently, and where "slow_path()" is executed infrequently, the
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