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List:       user-mode-linux-devel
Subject:    [uml-devel] [ PATCH 5/6 ] UML - AIO deadlock avoidance
From:       Jeff Dike <jdike () addtoit ! com>
Date:       2007-04-12 16:28:05
Message-ID: 20070412162805.GA7250 () c2 ! user-mode-linux ! org
[Download RAW message or body]

Allow deadlocks to be avoided in the AIO code by setting the pipe to
the I/O thread non-blocking.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
--
 arch/um/os-Linux/aio.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6.21-mm/arch/um/os-Linux/aio.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/os-Linux/aio.c	2007-04-12 11:34:40.000000000 -0400
+++ linux-2.6.21-mm/arch/um/os-Linux/aio.c	2007-04-12 11:47:14.000000000 -0400
@@ -221,6 +221,11 @@ static int init_aio_24(void)
 
 	aio_req_fd_w = fds[0];
 	aio_req_fd_r = fds[1];
+
+	err = os_set_fd_block(aio_req_fd_w, 0);
+	if(err)
+		goto out_close_pipe;
+
 	err = run_helper_thread(not_aio_thread, NULL,
 				CLONE_FILES | CLONE_VM | SIGCHLD, &stack, 0);
 	if(err < 0)

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