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authornobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2012-11-21 13:40:00 +0000
committernobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2012-11-21 13:40:00 +0000
commite786aa711da8e64734d20acfd9c6b8df0b4515c5 (patch)
treede792c01c3a6f363bc09ec0c3ba4a9c7b709970b /ext/io
parent7d0cabb8f881798da1332becf60096a09fbb6c01 (diff)
io/wait: add IO#wait_writable method
* ext/io/wait/wait.c (io_wait_writable): this is easier to use than IO.select for a single IO object and is immune to the limitations/innefficiency of select() on platforms where poll/ppoll is available. patched by Eric Wong. [Feature #4646] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37785 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'ext/io')
-rw-r--r--ext/io/wait/wait.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/ext/io/wait/wait.c b/ext/io/wait/wait.c
index 197d9b6..531b7ef 100644
--- a/ext/io/wait/wait.c
+++ b/ext/io/wait/wait.c
@@ -133,6 +133,43 @@ io_wait(int argc, VALUE *argv, VALUE io)
}
/*
+ * call-seq:
+ * io.wait_writable -> IO
+ * io.wait_writable(timeout) -> IO or nil
+ *
+ * Waits until IO writable is available or times out and returns self or
+ * nil when EOF is reached.
+ */
+static VALUE
+io_wait_writable(int argc, VALUE *argv, VALUE io)
+{
+ rb_io_t *fptr;
+ int i;
+ VALUE timeout;
+ struct timeval timerec;
+ struct timeval *tv;
+
+ GetOpenFile(io, fptr);
+ rb_io_check_writable(fptr);
+ rb_scan_args(argc, argv, "01", &timeout);
+ if (NIL_P(timeout)) {
+ tv = NULL;
+ }
+ else {
+ timerec = rb_time_interval(timeout);
+ tv = &timerec;
+ }
+
+ i = rb_wait_for_single_fd(fptr->fd, RB_WAITFD_OUT, tv);
+ if (i < 0)
+ rb_sys_fail(0);
+ rb_io_check_closed(fptr);
+ if (i & RB_WAITFD_OUT)
+ return io;
+ return Qnil;
+}
+
+/*
* IO wait methods
*/
@@ -142,4 +179,5 @@ Init_wait()
rb_define_method(rb_cIO, "nread", io_nread, 0);
rb_define_method(rb_cIO, "ready?", io_ready_p, 0);
rb_define_method(rb_cIO, "wait", io_wait, -1);
+ rb_define_method(rb_cIO, "wait_writable", io_wait_writable, -1);
}