Second Extended Filesystem (ext2) and other improvements (#33)

[lunaix-os.git] / lunaix-os / kernel / process / switch.c

diff --git a/lunaix-os/kernel/process/switch.c b/lunaix-os/kernel/process/switch.c
new file mode 100644 (file)
index 0000000..c5d9f27
--- /dev/null
+++ b/lunaix-os/kernel/process/switch.c
@@ -0,0 +1,37 @@
+#include <lunaix/switch.h>
+#include <lunaix/signal.h>
+#include <lunaix/sched.h>
+#include <lunaix/process.h>
+
+extern void
+signal_dispatch(struct signpost_result* result);
+
+extern void
+preempt_handle_stalled(struct signpost_result* result);
+
+#define do_signpost(fn, result)                         \
+    do {                                                \
+        fn((result));                                   \
+        if ((result)->mode == SWITCH_MODE_FAST) {       \
+            thread_stats_update_leaving();              \
+            return (result)->stack;                     \
+        }                                               \
+        if ((result)->mode == SWITCH_MODE_GIVEUP) {     \
+            schedule();                                 \
+            fail("unexpected return");                  \
+        }                                               \
+    } while (0)
+
+ptr_t
+switch_signposting()
+{
+    struct signpost_result result;
+
+    do_signpost(preempt_handle_stalled, &result);
+
+    do_signpost(signal_dispatch, &result);
+
+    thread_stats_update_leaving();
+
+    return 0;
+}
\ No newline at end of file