Revert "thread_pthread.c: fix memory leak from fork loop leapfrog"

Oops, CI failures...

This reverts r66288 / commit 2b1dcc1dd1.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66289 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

thread_pthread.c

@@ -1726,12 +1726,16 @@ rb_thread_create_timer_thread(void)
     if (setup_communication_pipe_internal(signal_self_pipe.normal) < 0) return;
     if (setup_communication_pipe_internal(signal_self_pipe.ub_main) < 0) return;
 
-    ubf_timer_create(current);
     if (owner != current) {
         /* validate pipe on this process */
+        ubf_timer_create(current);
         sigwait_th = THREAD_INVALID;
         signal_self_pipe.owner_process = current;
     }
+    else if (UBF_TIMER == UBF_TIMER_PTHREAD) {
+        /* UBF_TIMER_PTHREAD needs to recreate after fork */
+        ubf_timer_pthread_create(current);
+    }
 }
 
 static void
@@ -1759,13 +1763,7 @@ ubf_timer_disarm(void)
 static void
 ubf_timer_destroy(void)
 {
-#if UBF_TIMER == UBF_TIMER_POSIX
-    if (timer_posix.owner == getpid()) {
-        if (timer_delete(timer_posix.timerid) < 0)
-            rb_sys_fail("timer_delete");
-        memset(&timer_posix, 0, sizeof(timer_posix));
-    }
-#elif UBF_TIMER == UBF_TIMER_PTHREAD
+#if UBF_TIMER == UBF_TIMER_PTHREAD
     int err;
 
     timer_pthread.owner = 0;
@@ -1776,6 +1774,7 @@ ubf_timer_destroy(void)
         rb_raise(rb_eThreadError, "native_thread_join() failed (%d)", err);
     }
 #endif
+/* no need to destroy real POSIX timers */
 }
 
 static int