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authorMattias Andrée <maandree@operamail.com>2015-04-26 23:09:47 +0200
committerMattias Andrée <maandree@operamail.com>2015-04-26 23:09:47 +0200
commitf55736973fe53a0f7cf139887235998521adf67e (patch)
tree78c122a80903498fcf7f2ae2a3e7642c1aeb52b6 /src/bus.c
parentman pages: edit bugs section (diff)
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add polling functions
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src/bus.c')
-rw-r--r--src/bus.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/src/bus.c b/src/bus.c
index db16894..b17d897 100644
--- a/src/bus.c
+++ b/src/bus.c
@@ -665,3 +665,42 @@ fail:
return -1;
}
+
+int
+bus_poll_start(const bus_t *bus)
+{
+ return release_semaphore(bus, S, SEM_UNDO);
+}
+
+
+int
+bus_poll_stop(const bus_t *bus)
+{
+ return acquire_semaphore(bus, S, SEM_UNDO);
+}
+
+
+int
+bus_poll_continue(const bus_t *bus)
+{
+ t(release_semaphore(bus, W, SEM_UNDO));
+ t(acquire_semaphore(bus, S, SEM_UNDO));
+ t(zero_semaphore(bus, S));
+ t(release_semaphore(bus, S, SEM_UNDO));
+ t(acquire_semaphore(bus, W, SEM_UNDO));
+ return 0;
+fail:
+ return -1;
+}
+
+
+const char *
+bus_poll(const bus_t *bus)
+{
+ t(release_semaphore(bus, Q, 0));
+ t(zero_semaphore(bus, Q));
+ return bus->message;
+fail:
+ return NULL;
+}
+