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- Added a hopefully enlightening comment on the subtleties of semaphore

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locking in the stdio_fflush.c file.


git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14915 87f5fb63-7c3d-0410-a384-fd976d0f7a62
This commit is contained in:
Olaf Barthel
2005-04-04 11:56:26 +00:00
parent 92cc3e9a79
commit 6e39efe7d7
3 changed files with 16 additions and 5 deletions
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4
library/include/complex.h
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@ -1,5 +1,5 @@
/* /*
* $Id: complex.h,v 1.1 2005-04-03 10:22:48 obarthel Exp $ * $Id: complex.h,v 1.2 2005-04-04 11:56:26 obarthel Exp $
* *
* :ts=4 * :ts=4
* *
@ -65,7 +65,7 @@ extern "C" {
/****************************************************************************/ /****************************************************************************/
/* Basic types. */ /* Basic types; imaginary is assumed not to be implemented yet. */
#define complex _Complex #define complex _Complex
/****************************************************************************/ /****************************************************************************/

13
library/stdio_fflush.c
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@ -1,5 +1,5 @@
/* /*
* $Id: stdio_fflush.c,v 1.6 2005-02-27 21:58:21 obarthel Exp $ * $Id: stdio_fflush.c,v 1.7 2005-04-04 11:56:22 obarthel Exp $
* *
* :ts=4 * :ts=4
* *
@ -55,6 +55,17 @@ fflush(FILE *stream)
if(__check_abort_enabled) if(__check_abort_enabled)
__check_abort(); __check_abort();
/* Subtlety alert: the thread-safe library needs to obtain locks for
stdio, buffered files and file descriptors in a very particular
order in order to steer clear of deadlocks. The order is as given
above: stdio, buffered files, file descriptor table entries. Which
normally means that if code has any business locking stdio or the
file descriptor table entries, it should lock stdio first. This
function, at least in the UNIX_PATH_SEMANTICS variant, does not do
this. Here's why: if the 'stream' variable is NULL to start with,
no per-stream locking is performed anyway, and the stdio lock can
be obtained without running the risk of having obtain semaphores
in the wrong order. */
flockfile(stream); flockfile(stream);
#if defined(UNIX_PATH_SEMANTICS) #if defined(UNIX_PATH_SEMANTICS)

4
library/stdlib_main.c
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@ -1,5 +1,5 @@
/* /*
* $Id: stdlib_main.c,v 1.22 2005-04-01 18:46:37 obarthel Exp $ * $Id: stdlib_main.c,v 1.23 2005-04-04 11:56:22 obarthel Exp $
* *
* :ts=4 * :ts=4
* *
@ -354,7 +354,7 @@ _main(void)
__stack_size = size; __stack_size = size;
} }
/* How much stack size was provided? */ /* How much stack space was provided? */
current_stack_size = get_stack_size(); current_stack_size = get_stack_size();
/* If this is a resident program, don't allow for the detach /* If this is a resident program, don't allow for the detach