[PATCH] drand48.3: ATTRIBUTES: Note functions that are not thread-safe

[PATCH] drand48.3: ATTRIBUTES: Note functions that are not thread-safe

[Peng Haitao]

The functions drand48(), erand48(), lrand48(), nrand48(),
mrand48(), jrand48(), srand48(), seed48() and lcong48() are
not thread safe.

Signed-off-by: Peng Haitao <penght-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
---
 man3/drand48.3 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/man3/drand48.3 b/man3/drand48.3
index 3dad8fc..d65ae3d 100644
--- a/man3/drand48.3
+++ b/man3/drand48.3
@@ -201,6 +201,21 @@ has been called, a subsequent call to either
 or
 .BR seed48 ()
 will restore the standard values of \fIa\fP and \fIc\fP.
+.SH ATTRIBUTES
+.SS Multithreading (see pthreads(7))
+The
+.BR drand48 (),
+.BR erand48 (),
+.BR lrand48 (),
+.BR nrand48 (),
+.BR mrand48 (),
+.BR jrand48 (),
+.BR srand48 (),
+.BR seed48 (),
+and
+.BR lcong48 ()
+functions use a global state of the random number generator,
+so they are not thread-safe.
 .SH CONFORMING TO
 SVr4, POSIX.1-2001.
 .SH NOTES
-- 
1.8.1.4

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Re: [PATCH] drand48.3: ATTRIBUTES: Note functions that are not thread-safe

[Michael Kerrisk]

On 05/20/13 07:33, Peng Haitao wrote:
> The functions drand48(), erand48(), lrand48(), nrand48(),
> mrand48(), jrand48(), srand48(), seed48() and lcong48() are
> not thread safe.
> 
> Signed-off-by: Peng Haitao <penght-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>

Thanks, Peng. Applied in my local branch for this work.

Cheers,

Michael


> ---
>  man3/drand48.3 | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/man3/drand48.3 b/man3/drand48.3
> index 3dad8fc..d65ae3d 100644
> --- a/man3/drand48.3
> +++ b/man3/drand48.3
> @@ -201,6 +201,21 @@ has been called, a subsequent call to either
>  or
>  .BR seed48 ()
>  will restore the standard values of \fIa\fP and \fIc\fP.
> +.SH ATTRIBUTES
> +.SS Multithreading (see pthreads(7))
> +The
> +.BR drand48 (),
> +.BR erand48 (),
> +.BR lrand48 (),
> +.BR nrand48 (),
> +.BR mrand48 (),
> +.BR jrand48 (),
> +.BR srand48 (),
> +.BR seed48 (),
> +and
> +.BR lcong48 ()
> +functions use a global state of the random number generator,
> +so they are not thread-safe.
>  .SH CONFORMING TO
>  SVr4, POSIX.1-2001.
>  .SH NOTES
> 

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