1 files changed, 50 insertions, 0 deletions

diff --git a/firmware/target/hosted/sdl/thread-sdl.c b/firmware/target/hosted/sdl/thread-sdl.c
index fbc26c8a9f..c17e793833 100644
--- a/firmware/target/hosted/sdl/thread-sdl.c
+++ b/firmware/target/hosted/sdl/thread-sdl.c
@@ -682,3 +682,53 @@ void thread_get_name(char *buffer, int size,
         snprintf(buffer, size, fmt, name);
     }
 }
+
+/* Unless otherwise defined, do nothing */
+#ifndef YIELD_KERNEL_HOOK
+#define YIELD_KERNEL_HOOK() false
+#endif
+#ifndef SLEEP_KERNEL_HOOK
+#define SLEEP_KERNEL_HOOK(ticks) false
+#endif
+
+
+/*---------------------------------------------------------------------------
+ * Suspends a thread's execution for at least the specified number of ticks.
+ *
+ * May result in CPU core entering wait-for-interrupt mode if no other thread
+ * may be scheduled.
+ *
+ * NOTE: sleep(0) sleeps until the end of the current tick
+ *       sleep(n) that doesn't result in rescheduling:
+ *                      n <= ticks suspended < n + 1
+ *       n to n+1 is a lower bound. Other factors may affect the actual time
+ *       a thread is suspended before it runs again.
+ *---------------------------------------------------------------------------
+ */
+unsigned sleep(unsigned ticks)
+{
+    /* In certain situations, certain bootloaders in particular, a normal
+     * threading call is inappropriate. */
+    if (SLEEP_KERNEL_HOOK(ticks))
+        return 0; /* Handled */
+
+    disable_irq();
+    sleep_thread(ticks);
+    switch_thread();
+    return 0;
+}
+
+/*---------------------------------------------------------------------------
+ * Elects another thread to run or, if no other thread may be made ready to
+ * run, immediately returns control back to the calling thread.
+ *---------------------------------------------------------------------------
+ */
+void yield(void)
+{
+    /* In certain situations, certain bootloaders in particular, a normal
+     * threading call is inappropriate. */
+    if (YIELD_KERNEL_HOOK())
+        return; /* handled */
+
+    switch_thread();
+}