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, 7 insertions, 0 deletions

diff --git a/vm_core.h b/vm_core.h
index bdbe87287b..9db99fe03b 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -100,6 +100,13 @@
 #  define RUBY_SIGCHLD    (0)
 #endif
 
+/* platforms with broken or non-existent SIGCHLD work by polling */
+#if defined(__APPLE__) || defined(__WIN32__)
+#  define SIGCHLD_LOSSY (1)
+#else
+#  define SIGCHLD_LOSSY (0)
+#endif
+
 #ifdef HAVE_STDARG_PROTOTYPES
 #include <stdarg.h>
 #define va_init_list(a,b) va_start((a),(b))