use SIGCHLD_LOSSY to enable waitpid polling mode

Some systems lack SIGCHLD or have incomplete SIGCHLD
implementations.  So enable polling mode for them.

[ruby-core:87705] [Bug #14867]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63795 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/signal.c b/signal.c
index a817cb336a..7b725d8268 100644
--- a/signal.c
+++ b/signal.c
@@ -1066,7 +1066,7 @@ void ruby_waitpid_all(rb_vm_t *); /* process.c */
 void
 ruby_sigchld_handler(rb_vm_t *vm)
 {
-    if (ATOMIC_EXCHANGE(sigchld_hit, 0)) {
+    if (SIGCHLD_LOSSY || ATOMIC_EXCHANGE(sigchld_hit, 0)) {
         ruby_waitpid_all(vm);
     }
 }