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getusershell: Optimize stdio accesses when possible.

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* lib/getusershell.c: Test GNULIB_GETUSERSHELL_SINGLE_THREAD instead of
USE_UNLOCKED_IO.
* modules/getusershell (Depends-on): Add unlocked-io-internal.
* doc/multithread.texi: Document GNULIB_GETUSERSHELL_SINGLE_THREAD.
This commit is contained in:
Bruno Haible
2021-03-07 02:21:49 +01:00
parent 212f0b69ab
commit 92052c4491
4 changed files with 16 additions and 3 deletions
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8
ChangeLog
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@@ -1,3 +1,11 @@
2021-03-06 Bruno Haible <bruno@clisp.org>
getusershell: Optimize stdio accesses when possible.
* lib/getusershell.c: Test GNULIB_GETUSERSHELL_SINGLE_THREAD instead of
USE_UNLOCKED_IO.
* modules/getusershell (Depends-on): Add unlocked-io-internal.
* doc/multithread.texi: Document GNULIB_GETUSERSHELL_SINGLE_THREAD.
2021-03-06 Bruno Haible <bruno@clisp.org>
unlocked-io-internal: New module.

4
doc/multithread.texi
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@@ -274,4 +274,8 @@ You may define the C macro @code{GNULIB_WCHAR_SINGLE}, if all the programs in
your package are single-threaded and won't change the locale after it has
been initialized. This macro optimizes the functions @code{mbrtowc} and
@code{wcwidth}.
@item
You may define the C macro @code{GNULIB_GETUSERSHELL_SINGLE_THREAD}, if all the
programs in your package invoke the functions @code{setusershell},
@code{getusershell}, @code{endusershell} only from a single thread.
@end itemize

2
lib/getusershell.c
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@@ -39,7 +39,7 @@
#include "stdio--.h"
#include "xalloc.h"
#if USE_UNLOCKED_IO
#if GNULIB_GETUSERSHELL_SINGLE_THREAD
# include "unlocked-io.h"
#endif

5
modules/getusershell
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@@ -8,8 +8,9 @@ m4/getusershell.m4
Depends-on:
unistd
extensions
fopen-safer [test $HAVE_GETUSERSHELL = 0]
xalloc [test $HAVE_GETUSERSHELL = 0]
fopen-safer [test $HAVE_GETUSERSHELL = 0]
unlocked-io-internal [test $HAVE_GETUSERSHELL = 0]
xalloc [test $HAVE_GETUSERSHELL = 0]
configure.ac:
gl_FUNC_GETUSERSHELL