From: ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu, 26 Nov 2015 00:24:21 +0000 (+0000)
Subject: 	PR go/61303
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=12178003b25390b4b6f7e50ae340bf3b8e45a0bc;p=thirdparty%2Fgcc.git

	PR go/61303
    runtime: don't overallocate in select code

    If we've already allocated an fd_set, don't allocate another one.

    Also, don't bother to read from rdwake if it wasn't returned in select.

    Fixes https://gcc.gnu.org/PR61303.

    Reviewed-on: https://go-review.googlesource.com/17243


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@230922 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 9fe9d5e1042d..80136abcf76c 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-0d979f0b860cfd879754150e0ae5e1018b94d7c4
+81eb6a3f425b2158c67ee32c0cc973a72ce9d6be
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/libgo/runtime/netpoll_select.c b/libgo/runtime/netpoll_select.c
index b46133591184..033661d17f24 100644
--- a/libgo/runtime/netpoll_select.c
+++ b/libgo/runtime/netpoll_select.c
@@ -135,6 +135,8 @@ runtime_netpoll(bool block)
 	byte b;
 	struct stat st;
 
+	allocatedfds = false;
+
  retry:
 	runtime_lock(&selectlock);
 
@@ -146,11 +148,13 @@ runtime_netpoll(bool block)
 	}
 
 	if(inuse) {
-		prfds = runtime_SysAlloc(4 * sizeof fds, &mstats.other_sys);
-		pwfds = prfds + 1;
-		pefds = pwfds + 1;
-		ptfds = pefds + 1;
-		allocatedfds = true;
+		if(!allocatedfds) {
+			prfds = runtime_SysAlloc(4 * sizeof fds, &mstats.other_sys);
+			pwfds = prfds + 1;
+			pefds = pwfds + 1;
+			ptfds = pefds + 1;
+			allocatedfds = true;
+		}
 	} else {
 		prfds = &grfds;
 		pwfds = &gwfds;
@@ -216,7 +220,7 @@ runtime_netpoll(bool block)
 			mode = 'r' + 'w';
 			--c;
 		}
-		if(i == rdwake) {
+		if(i == rdwake && mode != 0) {
 			while(read(rdwake, &b, sizeof b) > 0)
 				;
 			continue;