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authorUlrich Drepper <drepper@redhat.com>2001-12-14 22:17:03 +0000
committerUlrich Drepper <drepper@redhat.com>2001-12-14 22:17:03 +0000
commit638621aff981fc5e9e5824d04c67ef2a7dfa4744 (patch)
treef81d717e5260b86d984b4767bcdecd48be253f30 /linuxthreads
parent0ce9cf883db2ec6bf8854828b4b57d03e050c5f2 (diff)
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Update.
* sysdeps/generic/strstr.c (strstr): Update. New optimized version.
Diffstat (limited to 'linuxthreads')
-rw-r--r--linuxthreads/ChangeLog6
-rw-r--r--linuxthreads/linuxthreads.texi11
-rw-r--r--linuxthreads/man/pthread_atfork.man13
3 files changed, 14 insertions, 16 deletions
diff --git a/linuxthreads/ChangeLog b/linuxthreads/ChangeLog
index a926600..2b55b8f 100644
--- a/linuxthreads/ChangeLog
+++ b/linuxthreads/ChangeLog
@@ -1,3 +1,9 @@
+2001-12-14 Ulrich Drepper <drepper@redhat.com>
+
+ * man/pthread_atfork.man: Adjust description of mutex handling
+ after fork for current implementation.
+ * linuxthreads.texi: Likewise [PR libc/2519].
+
2001-12-13 Andreas Schwab <schwab@suse.de>
* specific.c (pthread_key_delete): Don't contact the thread
diff --git a/linuxthreads/linuxthreads.texi b/linuxthreads/linuxthreads.texi
index 9513a67..b4d83c9 100644
--- a/linuxthreads/linuxthreads.texi
+++ b/linuxthreads/linuxthreads.texi
@@ -1395,12 +1395,10 @@ pocess image.
To understand the purpose of @code{pthread_atfork}, recall that
@code{fork} duplicates the whole memory space, including mutexes in
their current locking state, but only the calling thread: other threads
-are not running in the child process. Thus, if a mutex is locked by a
-thread other than the thread calling @code{fork}, that mutex will remain
-locked forever in the child process, possibly blocking the execution of
-the child process. Or if some shared data, such as a linked list, was in the
-middle of being updated by a thread in the parent process, the child
-will get a copy of the incompletely updated data which it cannot use.
+are not running in the child process. The mutexes are not usable after
+the @code{fork} and must be initialized with @code{pthread_mutex_init}
+in the child process. This is a limitation of the current
+implementation and might or might not be present in future versions.
To avoid this, install handlers with @code{pthread_atfork} as follows: have the
@var{prepare} handler lock the mutexes (in locking order), and the
@@ -1627,4 +1625,3 @@ of a mapping of user threads to kernel threads. It exists for source
compatibility. However, it will return the value that was set by the
last call to @code{pthread_setconcurrency}.
@end deftypefun
-
diff --git a/linuxthreads/man/pthread_atfork.man b/linuxthreads/man/pthread_atfork.man
index 4d06a56..b682bed 100644
--- a/linuxthreads/man/pthread_atfork.man
+++ b/linuxthreads/man/pthread_atfork.man
@@ -30,15 +30,10 @@ while the |parent| and |child| handlers are called in FIFO order
To understand the purpose of !pthread_atfork!, recall that !fork!(2)
duplicates the whole memory space, including mutexes in their current
locking state, but only the calling thread: other threads are not
-running in the child process. Thus, if a mutex is locked by a thread
-other than the thread calling !fork!, that mutex will remain locked
-forever in the child process, possibly blocking the execution of the
-child process. To avoid this, install handlers with !pthread_atfork!
-as follows: the |prepare| handler locks the global mutexes (in locking
-order), and the |parent| and |child| handlers unlock them (in
-reverse order). Alternatively, |prepare| and |parent| can be set to
-!NULL! and |child| to a function that calls !pthread_mutex_init! on
-the global mutexes.
+running in the child process. The mutexes are not usable after the
+!fork! and must be initialized with |pthread_mutex_init| in the child
+process. This is a limitation of the current implementation and might
+or might not be present in future versions.
.SH "RETURN VALUE"