Implement a basic event loop built on LittleLock

It's not guaranteed that there will always be an event loop to run, and this
implementation will serve as an incredibly basic one which does not provide any
I/O, but allows the scheduler to still run.

cc #9128

2 files changed, 12 insertions, 0 deletions

diff --git a/src/rt/rust_builtin.cpp b/src/rt/rust_builtin.cpp
index 77020537661..a8eec52943e 100644
--- a/src/rt/rust_builtin.cpp
+++ b/src/rt/rust_builtin.cpp
@@ -377,6 +377,16 @@ rust_unlock_little_lock(lock_and_signal *lock) {
     lock->unlock();
 }
 
+extern "C" void
+rust_wait_little_lock(lock_and_signal *lock) {
+    lock->wait();
+}
+
+extern "C" void
+rust_signal_little_lock(lock_and_signal *lock) {
+    lock->signal();
+}
+
 typedef void(startfn)(void*, void*);
 
 class raw_thread: public rust_thread {
diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index 269da8e7882..06f4c0006f1 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -128,6 +128,8 @@ rust_create_little_lock
 rust_destroy_little_lock
 rust_lock_little_lock
 rust_unlock_little_lock
+rust_signal_little_lock
+rust_wait_little_lock
 tdefl_compress_mem_to_heap
 tinfl_decompress_mem_to_heap
 rust_uv_ip4_port