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/mjit.c b/mjit.c
index e166a066bf..fb4b153cc3 100644
--- a/mjit.c
+++ b/mjit.c
@@ -408,7 +408,7 @@ exec_process(const char *path, char *const argv[])
 {
     int stat, exit_code = -2;
     pid_t pid;
-    rb_vm_t *vm = RUBY_SIGCHLD ? GET_VM() : 0;
+    rb_vm_t *vm = (RUBY_SIGCHLD || SIGCHLD_LOSSY) ? GET_VM() : 0;
     rb_nativethread_cond_t cond;
 
     if (vm) {