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authorRichard Braun <rbraun@sceen.net>2013-02-26 22:24:47 +0100
committerSamuel Thibault <samuel.thibault@ens-lyon.org>2013-02-28 18:23:35 +0100
commit8cd75c4d6b229bb4e3de9264466731e3a32e0133 (patch)
tree89d70f9cd3d4244182a61c5f36389d594aca602d /trans/fifo.c
parentcc36b5a5e2e8df6e633bb767df84ac1e61c56bc3 (diff)
Add io_select_timeout to the io interface
This change fixes a problem that can occur with non-blocking (and also blocking for very short times) select/poll calls. The problem occurs because the timeout is implemented at the client side. For a non-blocking call, this means that (depending on the code path taken in the C library) the client could get a timeout without a full RPC round-trip to the server. Moving the implementation of the timeout to the servers guarantees a full round-trip, and correct results for non-blocking calls. The modifications in this change depend on the availability of the recently added pthread_hurd_cond_timedwait_np function in libpthread. * boot/boot.c (io_select_common): New static function. (S_io_select): Use io_select_common. (S_io_select_timeout): New function which makes use of io_select_common. * console-client/kbd-repeat.c (repeater_select): Add a timeout parameter. * console-client/pc-mouse.c (repeater_select): Likewise. * console-client/trans.c (io_select_common): New static function. (netfs_S_io_select): Use io_select_common. (netfs_S_io_select_timeout): New function which makes use of io_select_common. * console-client/trans.h (struct consnode): Add a timeout parameter. * hurd/io.defs (io_select_timeout): New MIG routine. * hurd/io_reply.defs (io_select_timeout_reply): New MIG simpleroutine. * hurd/io_request.defs (io_select_timeout_request): Likewise. * libdiskfs/io-select.c (diskfs_S_io_select_timeout): New function. * libnetfs/io-select.c (netfs_S_io_select_timeout): Likewise. * libpipe/pipe.c (pipe_pair_select): Add a timeout parameter. * libpipe/pipe.h (pipe_select_readable): Likewise. (pipe_select_writable): Likewise. (pipe_pair_select): Likewise. * libpipe/pq.h: Include <hurd/hurd_types.h>. * libtrivfs/io-select.c (trivfs_S_io_select_timeout): New function. * pfinet/glue-include/linux/sched.h: Include <errno.h>. (interruptible_sleep_on): Function removed, replaced with ... (interruptible_sleep_on_timeout): New function. (schedule): Update to use interruptible_sleep_on_timeout. (schedule_timeout): Likewise. * pfinet/io-ops.c (io_select_common): New static function. (S_io_select): Use io_select_common. (S_io_select_timeout): New function which makes use of io_select_common. * pfinet/tunnel.c (io_select_common): New static function. (trivfs_S_io_select): Use io_select_common. (trivfs_S_io_select_timeout): New function which makes use of io_select_common. * pflocal/connq.c (connq_listen): Replace noblock with a timeout parameter. * pflocal/connq.h: Include <hurd/hurd_types.h>. (connq_listen): Update declaration to replace noblock with a timeout parameter. * pflocal/io.c (io_select_common): New static function. (S_io_select): Use io_select_common. (S_io_select_timeout): New function which makes use of io_select_common. * pflocal/socket.c (S_socket_accept): Update call to connq_listen to match new declaration. * storeio/io.c (trivfs_S_io_select_timeout): New function. * term/ptyio.c (pty_io_select): Add a timeout parameter. * term/term.h (pty_io_select): Likewise. * term/users.c (io_select_common): New static function. (trivfs_S_io_select): Use io_select_common. (trivfs_S_io_select_timeout): New function which makes use of io_select_common. * trans/fifo.c (io_select_common): New static function. (trivfs_S_io_select): Use io_select_common. (trivfs_S_io_select_timeout): New function which makes use of io_select_common. * trans/firmlink.c (trivfs_S_io_select_timeout): New function. * trans/new-fifo.c (io_select_common): New static function. (trivfs_S_io_select): Use io_select_common. (trivfs_S_io_select_timeout): New function which makes use of io_select_common. * trans/null.c (trivfs_S_io_select_timeout): New function. * trans/streamio.c (io_select_common): New static function. (trivfs_S_io_select): Use io_select_common. (trivfs_S_io_select_timeout): New function which makes use of io_select_common.
Diffstat (limited to 'trans/fifo.c')
-rw-r--r--trans/fifo.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/trans/fifo.c b/trans/fifo.c
index b40a50d1..e6fbd0e9 100644
--- a/trans/fifo.c
+++ b/trans/fifo.c
@@ -405,10 +405,10 @@ trivfs_S_io_seek (struct trivfs_protid *cred,
return the types that are then available. ID_TAG is returned as passed; it
is just for the convenience of the user in matching up reply messages with
specific requests sent. */
-error_t
-trivfs_S_io_select (struct trivfs_protid *cred,
- mach_port_t reply, mach_msg_type_name_t reply_type,
- int *select_type)
+static error_t
+io_select_common (struct trivfs_protid *cred,
+ mach_port_t reply, mach_msg_type_name_t reply_type,
+ struct timespec *tsp, int *select_type)
{
struct pipe *pipe;
error_t err = 0;
@@ -466,11 +466,28 @@ trivfs_S_io_select (struct trivfs_protid *cred,
/* Wait for something to change. */
{
ports_interrupt_self_on_port_death (cred, reply);
- err = pipe_pair_select (pipe, pipe, select_type, 1);
+ err = pipe_pair_select (pipe, pipe, tsp, select_type, 1);
}
return err;
}
+
+error_t
+trivfs_S_io_select (struct trivfs_protid *cred,
+ mach_port_t reply, mach_msg_type_name_t reply_type,
+ int *select_type)
+{
+ return io_select_common (cred, reply, reply_type, NULL, select_type);
+}
+
+error_t
+trivfs_S_io_select_timeout (struct trivfs_protid *cred,
+ mach_port_t reply, mach_msg_type_name_t reply_type,
+ struct timespec ts,
+ int *select_type)
+{
+ return io_select_common (cred, reply, reply_type, &ts, select_type);
+}
/* ---------------------------------------------------------------- */