* test/-ext-/popen_deadlock/test_popen_deadlock.rb: test [Bug #11265]

* ext/-test-/popen_deadlock/infinite_loop_dlsym.c: new ext to call
  dlsym(3) infinitely without GVL, used in the above test.
  
* ext/-test-/popen_deadlock/extconf.rb: extconf.rb for the above
  ext. Currently, only enabled on Solaris (main target) and Linux
  (as a reference platform and for debugging the ext).


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51030 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 54 insertions, 0 deletions

diff --git a/ext/-test-/popen_deadlock/extconf.rb b/ext/-test-/popen_deadlock/extconf.rb
new file mode 100644
index 0000000000..f993ff7f9a
--- /dev/null
+++ b/ext/-test-/popen_deadlock/extconf.rb
@@ -0,0 +1,4 @@
+case RUBY_PLATFORM
+when /solaris/i, /linux/i
+  create_makefile("-test-/popen_deadlock/infinite_loop_dlsym")
+end
diff --git a/ext/-test-/popen_deadlock/infinite_loop_dlsym.c b/ext/-test-/popen_deadlock/infinite_loop_dlsym.c
new file mode 100644
index 0000000000..1d95a7cc9a
--- /dev/null
+++ b/ext/-test-/popen_deadlock/infinite_loop_dlsym.c
@@ -0,0 +1,50 @@
+#include "ruby/ruby.h"
+#include "ruby/thread.h"
+#include <dlfcn.h>
+
+struct data_for_loop_dlsym {
+    const char *name;
+    volatile int stop;
+};
+
+static void*
+native_loop_dlsym(void *data)
+{
+    struct data_for_loop_dlsym *s = data;
+
+    while (!(s->stop)) {
+        dlsym(RTLD_DEFAULT, s->name);
+    }
+
+    return NULL;
+}
+
+static void
+ubf_for_loop_dlsym(void *data)
+{
+    struct data_for_loop_dlsym *s = data;
+
+    s->stop = 1;
+
+    return;
+}
+
+static VALUE
+loop_dlsym(VALUE self, VALUE name)
+{
+    struct data_for_loop_dlsym d;
+
+    d.stop = 0;
+    d.name = StringValuePtr(name);
+
+    rb_thread_call_without_gvl(native_loop_dlsym, &d,
+                               ubf_for_loop_dlsym, &d);
+
+    return self;
+}
+
+void
+Init_infinite_loop_dlsym(void)
+{
+    rb_define_method(rb_cThread, "__infinite_loop_dlsym__", loop_dlsym, 1);
+}