* 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

ChangeLog

@@ -1,3 +1,14 @@
+Thu Jun 25 21:24:28 2015  Naohisa Goto  <ngotogenome@gmail.com>
+
+	* 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).
+
 Thu Jun 25 19:24:25 2015  Naohisa Goto  <ngotogenome@gmail.com>
 
 	* configure.in: not to use vfork on Solaris to avoid deadlock

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

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);
+}

test/-ext-/popen_deadlock/test_popen_deadlock.rb

@@ -0,0 +1,35 @@
+begin
+  require '-test-/popen_deadlock/infinite_loop_dlsym'
+rescue LoadError
+  skip = true
+end
+
+class TestPopenDeadlock < Test::Unit::TestCase
+
+  # [Bug #11265]
+  def assert_popen_without_deadlock
+    assert_separately([], <<-"end;", timeout: 90) #do
+        require '-test-/popen_deadlock/infinite_loop_dlsym'
+
+        bug = '11265'.freeze
+        begin
+          t = Thread.new {
+            Thread.current.__infinite_loop_dlsym__("_ex_unwind")
+          }
+          str = IO.popen([ 'echo', bug ], 'r+') { |io| io.read }
+          assert_equal(bug, str.chomp)
+        ensure
+          t.kill if t
+        end
+    end;
+  end
+  private :assert_popen_without_deadlock
+
+  # 10 test methods are defined for showing progess reports
+  10.times do |i|
+    define_method("test_popen_without_deadlock_#{i}") {
+      assert_popen_without_deadlock
+    }
+  end
+
+end unless skip #class TestPopenDeadlock