devices: enable tests for audio on windows

BUG=b:213149155
BUG=b:150630566
BUG=b:236297362
TEST=tools/presubmit

Change-Id: I4619a5c9f1ff8b5ce00b4c7b7c4f5b19cff42471
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4006817
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Commit-Queue: Vikram Auradkar <auradkar@google.com>

Cargo.toml

@@ -315,7 +315,7 @@ all-armhf = [
     ]
 
 ## All features that are compiled and tested for mingw64
-all-mingw64 = [ "balloon", "crash_report", "gpu", "haxm", "slirp", "stats" ]
+all-mingw64 = [ "audio", "balloon", "crash_report", "gpu", "haxm", "slirp", "stats" ]
 
 ## All features that are compiled and tested for msvc64
 all-msvc64 = [ "all-mingw64" ]

devices/src/pci/ac97_bus_master/sys/windows.rs

@@ -290,7 +290,7 @@ impl Drop for Ac97BusMaster {
     fn drop(&mut self) {
         if let Some(exit_event) = &self.sys.exit_event {
             exit_event
-                .write(1)
+                .signal()
                 .expect("Failed to write to exit_event in Ac97BusMaster");
         }
 

devices/src/virtio/snd/common_backend/stream_info.rs

@@ -333,6 +333,8 @@ impl StreamInfo {
     }
 }
 
+// TODO(b/246997900): Get these new tests to run on Windows.
+#[cfg(unix)]
 #[cfg(test)]
 mod tests {
     use audio_streams::NoopStreamSourceGenerator;