Add thread suspend/resume signals public setters (POSIX threads)

* include/gc.h (GC_set_suspend_signal, GC_set_thr_restart_signal):
Add public function declaration (to specify non-default signals to
suspend/resume threads).
* include/gc.h (GC_get_suspend_signal, GC_get_thr_restart_signal):
Update comment.
* misc.c (GC_set_suspend_signal, GC_set_thr_restart_signal): Add
public no-op function (only for Darwin, OpenBSD, Win32 and NaCl).
* pthread_stop_world.c (GC_set_suspend_signal,
GC_set_thr_restart_signal): Add public setter to alter the default
signals used to suspend and resume threads (only if not OpenBSD or
NaCl); has no effect if GC is initialized.

1 files changed, 14 insertions, 0 deletions

diff --git a/pthread_stop_world.c b/pthread_stop_world.c
index 74500c4b..231ceeee 100644
--- a/pthread_stop_world.c
+++ b/pthread_stop_world.c
@@ -144,6 +144,20 @@ STATIC volatile AO_t GC_world_is_stopped = FALSE;
 STATIC int GC_sig_suspend = SIG_SUSPEND;
 STATIC int GC_sig_thr_restart = SIG_THR_RESTART;
 
+GC_API void GC_CALL GC_set_suspend_signal(int sig)
+{
+  if (GC_is_initialized) return;
+
+  GC_sig_suspend = sig;
+}
+
+GC_API void GC_CALL GC_set_thr_restart_signal(int sig)
+{
+  if (GC_is_initialized) return;
+
+  GC_sig_thr_restart = sig;
+}
+
 GC_API int GC_CALL GC_get_suspend_signal(void)
 {
   return GC_sig_suspend;