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Add comment about `GC_local_malloc ()' upon thread destruction.

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* libguile/threads.c (on_thread_exit): Add caveat about possible
  segfault.

git-archimport-id: lcourtes@laas.fr--2006-libre/guile-core--boehm-gc--0--patch-8
This commit is contained in:
Ludovic Courtes 2007-10-21 18:53:32 +00:00 • committed by Ludovic Courtès
parent 071e0d9329
commit 35747a3e06
1 changed files with 11 additions and 0 deletions
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11
libguile/threads.c
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@ -512,6 +512,17 @@ on_thread_exit (void *v)
/* Unblocking the joining threads needs to happen in guile mode /* Unblocking the joining threads needs to happen in guile mode
since the queue is a SCM data structure. */ since the queue is a SCM data structure. */
/* Note: `scm_with_guile ()' invokes `GC_local_malloc ()', which accesses
thread-local storage (TLS). If said storage is accessed using
`pthread_getspecific ()', then it may be inaccessible at this point,
having been destroyed earlier, since the invocation order of destructors
associated with pthread keys is unspecified:
http://www.opengroup.org/onlinepubs/009695399/functions/pthread_key_create.html
Thus, `libgc' *must* be compiled with `USE_COMPILER_TLS' for this code
to work. */
scm_with_guile (do_thread_exit, v); scm_with_guile (do_thread_exit, v);
/* Removing ourself from the list of all threads needs to happen in /* Removing ourself from the list of all threads needs to happen in