[ruby-dev:9721] Re: busy loop in `waitpid'

福嶋です。

[e-mail] (Yukihiro Matsumoto) wrote:
> 昨日、syswriteとselectは対応しました。が、waitpidとflockは結

selectの引数を省略すると落ちます。
とりあえず、チェックを入れてみました。

Index: eval.c
===================================================================
RCS file: /home/fukusima/src/ruby/CVSup/cvs/ruby/eval.c,v
retrieving revision 1.45
diff -u -r1.45 eval.c
--- eval.c	2000/05/16 02:46:51	1.45
+++ eval.c	2000/05/16 17:00:05
@@ -7013,9 +7013,12 @@
     }
 
     curr_thread->status = THREAD_STOPPED;
-    curr_thread->readfds = *read;
-    curr_thread->writefds = *write;
-    curr_thread->exceptfds = *except;
+    if (read) curr_thread->readfds = *read;
+    else FD_ZERO(&curr_thread->readfds);
+    if (write) curr_thread->writefds = *write;
+    else FD_ZERO(&curr_thread->writefds);
+    if (except) curr_thread->exceptfds = *except;
+    else FD_ZERO(&curr_thread->exceptfds);
     curr_thread->fd = max;
     curr_thread->wait_for = WAIT_SELECT;
     if (timeout) {
@@ -7024,9 +7027,9 @@
 	curr_thread->wait_for |= WAIT_TIME;
     }
     rb_thread_schedule();
-    *read = curr_thread->readfds;
-    *write = curr_thread->writefds;
-    *except = curr_thread->exceptfds;
+    if (read) *read = curr_thread->readfds;
+    if (write) *write = curr_thread->writefds;
+    if (except) *except = curr_thread->exceptfds;
     return curr_thread->fd;
 }
 


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