From 207f50b31a41071d3154c2f752967e50ff056488 Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Mon, 2 Jan 2017 00:23:36 +0000
Subject: unify rb_gc() handling for out-of-FD conditions

This should hopefully simplify logic a bit and avoid expensive
access to errno.
---
 ext/sleepy_penguin/epoll.c          | 4 +---
 ext/sleepy_penguin/eventfd.c        | 4 +---
 ext/sleepy_penguin/inotify.c        | 4 +---
 ext/sleepy_penguin/sleepy_penguin.h | 2 ++
 ext/sleepy_penguin/timerfd.c        | 4 +---
 ext/sleepy_penguin/util.c           | 9 +++++++++
 6 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/ext/sleepy_penguin/epoll.c b/ext/sleepy_penguin/epoll.c
index 120af0c..e655bf9 100644
--- a/ext/sleepy_penguin/epoll.c
+++ b/ext/sleepy_penguin/epoll.c
@@ -87,10 +87,8 @@ static VALUE s_new(VALUE klass, VALUE _flags)
 	VALUE rv;
 
 	if (fd < 0) {
-		if (errno == EMFILE || errno == ENFILE || errno == ENOMEM) {
-			rb_gc();
+		if (rb_sp_gc_for_fd(errno))
 			fd = epoll_create1(flags);
-		}
 		if (fd < 0)
 			rb_sys_fail("epoll_create1");
 	}
diff --git a/ext/sleepy_penguin/eventfd.c b/ext/sleepy_penguin/eventfd.c
index 4f95b0d..4804150 100644
--- a/ext/sleepy_penguin/eventfd.c
+++ b/ext/sleepy_penguin/eventfd.c
@@ -31,10 +31,8 @@ static VALUE s_new(int argc, VALUE *argv, VALUE klass)
 
 	fd = eventfd(initval, flags);
 	if (fd < 0) {
-		if (errno == EMFILE || errno == ENFILE || errno == ENOMEM) {
-			rb_gc();
+		if (rb_sp_gc_for_fd(errno))
 			fd = eventfd(initval, flags);
-		}
 		if (fd < 0)
 			rb_sys_fail("eventfd");
 	}
diff --git a/ext/sleepy_penguin/inotify.c b/ext/sleepy_penguin/inotify.c
index b324227..b5cd67b 100644
--- a/ext/sleepy_penguin/inotify.c
+++ b/ext/sleepy_penguin/inotify.c
@@ -26,10 +26,8 @@ static VALUE s_new(int argc, VALUE *argv, VALUE klass)
 
 	fd = inotify_init1(flags);
 	if (fd < 0) {
-		if (errno == EMFILE || errno == ENFILE || errno == ENOMEM) {
-			rb_gc();
+		if (rb_sp_gc_for_fd(errno))
 			fd = inotify_init1(flags);
-		}
 		if (fd < 0)
 			rb_sys_fail("inotify_init1");
 	}
diff --git a/ext/sleepy_penguin/sleepy_penguin.h b/ext/sleepy_penguin/sleepy_penguin.h
index 522ac0a..8aa514a 100644
--- a/ext/sleepy_penguin/sleepy_penguin.h
+++ b/ext/sleepy_penguin/sleepy_penguin.h
@@ -90,4 +90,6 @@ void *rb_sp_gettlsbuf(size_t *size);
 # endif
 #endif
 
+int rb_sp_gc_for_fd(int err);
+
 #endif /* SLEEPY_PENGUIN_H */
diff --git a/ext/sleepy_penguin/timerfd.c b/ext/sleepy_penguin/timerfd.c
index a4f5c7d..e3af46c 100644
--- a/ext/sleepy_penguin/timerfd.c
+++ b/ext/sleepy_penguin/timerfd.c
@@ -31,10 +31,8 @@ static VALUE s_new(int argc, VALUE *argv, VALUE klass)
 
 	fd = timerfd_create(clockid, flags);
 	if (fd < 0) {
-		if (errno == EMFILE || errno == ENFILE || errno == ENOMEM) {
-			rb_gc();
+		if (rb_sp_gc_for_fd(errno))
 			fd = timerfd_create(clockid, flags);
-		}
 		if (fd < 0)
 			rb_sys_fail("timerfd_create");
 	}
diff --git a/ext/sleepy_penguin/util.c b/ext/sleepy_penguin/util.c
index 4086b14..8dd6842 100644
--- a/ext/sleepy_penguin/util.c
+++ b/ext/sleepy_penguin/util.c
@@ -156,3 +156,12 @@ int rb_sp_wait(rb_sp_waitfn waiter, VALUE obj, int *fd)
 	*fd = rb_sp_fileno(obj);
 	return rc;
 }
+
+int rb_sp_gc_for_fd(int err)
+{
+	if (err == EMFILE || err == ENFILE || err == ENOMEM) {
+		rb_gc();
+		return 1;
+	}
+	return 0;
+}
-- 
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