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Fix support for threads already known to GC

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* libguile/threads.h (scm_i_thread): Add bool tracking whether the
  thread needs to be unregistered from libgc.
* libguile/threads.c (guilify_self_1): Add needs_unregister arg.
  (on_thread_exit): Only unregister thread if the thread needs it.
  (scm_i_init_thread_for_guile): A thread needs unregistering if
  GC_register_my_thread succeeded.
  (scm_threads_prehistory): Don't unregister initial thread.

  Fixes #19523.  Thanks to Anthonin Bonnefoy for the report.
This commit is contained in:
Andy Wingo 2017-02-28 13:14:02 +01:00
parent 631e9901d8
commit 4c3bea3dba
2 changed files with 17 additions and 5 deletions
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19
libguile/threads.c
View file

@ -372,7 +372,7 @@ static SCM default_dynamic_state;
/* Perform first stage of thread initialisation, in non-guile mode.
*/
static void
guilify_self_1 (struct GC_stack_base *base)
guilify_self_1 (struct GC_stack_base *base, int needs_unregister)
{
scm_i_thread t;
@ -410,6 +410,7 @@ guilify_self_1 (struct GC_stack_base *base)
t.exited = 0;
t.guile_mode = 0;
t.needs_unregister = needs_unregister;
/* The switcheroo. */
{
@ -523,8 +524,13 @@ on_thread_exit (void *v)
scm_i_vm_free_stack (vp);
}
#ifdef SCM_HAVE_THREAD_STORAGE_CLASS
scm_i_current_thread = NULL;
#endif
#if SCM_USE_PTHREAD_THREADS
GC_unregister_my_thread ();
if (t->needs_unregister)
GC_unregister_my_thread ();
#endif
}
@ -586,6 +592,8 @@ scm_i_init_thread_for_guile (struct GC_stack_base *base,
}
else
{
int needs_unregister = 0;
/* Guile is already initialized, but this thread enters it for
the first time. Only initialize this thread.
*/
@ -593,10 +601,11 @@ scm_i_init_thread_for_guile (struct GC_stack_base *base,
/* Register this thread with libgc. */
#if SCM_USE_PTHREAD_THREADS
GC_register_my_thread (base);
if (GC_register_my_thread (base) == GC_SUCCESS)
needs_unregister = 1;
#endif
guilify_self_1 (base);
guilify_self_1 (base, needs_unregister);
guilify_self_2 (dynamic_state);
}
return 1;
@ -1782,7 +1791,7 @@ scm_threads_prehistory (void *base)
GC_MAKE_PROC (GC_new_proc (thread_mark), 0),
0, 1);
guilify_self_1 ((struct GC_stack_base *) base);
guilify_self_1 ((struct GC_stack_base *) base, 0);
}
scm_t_bits scm_tc16_thread;

3
libguile/threads.h
View file

@ -59,6 +59,9 @@ typedef struct scm_i_thread {
/* Boolean indicating whether the thread is in guile mode. */
int guile_mode;
/* Boolean indicating whether to call GC_unregister_my_thread () when
this thread exits. */
int needs_unregister;
struct scm_thread_wake_data *wake;
scm_i_pthread_cond_t sleep_cond;