message: Add test of recursive mutex using libc FFI
diff: @@ -8,6 +8,7 @@ fn main() {
  test_mutex();
  #[cfg(not(target_os = "windows"))] // TODO: implement RwLock on Windows
  {
  + test_mutex_libc_recursive();
  test_rwlock_stdlib();
  test_rwlock_libc_init();
  test_rwlock_libc_static_initializer();
  @@ -24,6 +25,28 @@ fn test_mutex() {
  drop(m);
  }
  +#[cfg(not(target_os = "windows"))]
  +fn test_mutex_libc_recursive() {
  + unsafe {
  + let mut attr: libc::pthread_mutexattr_t = std::mem::zeroed();
  + assert_eq!(libc::pthread_mutexattr_init(&mut attr as *mut _), 0);
  + assert_eq!(libc::pthread_mutexattr_settype(&mut attr as *mut _, libc::PTHREAD_MUTEX_RECURSIVE), 0);
  + let mut mutex: libc::pthread_mutex_t = std::mem::zeroed();
  + assert_eq!(libc::pthread_mutex_init(&mut mutex as *mut _, &mut attr as *mut _), 0);
  + assert_eq!(libc::pthread_mutex_lock(&mut mutex as *mut _), 0);
  + assert_eq!(libc::pthread_mutex_trylock(&mut mutex as *mut _), 0);
  + assert_eq!(libc::pthread_mutex_unlock(&mut mutex as *mut _), 0);
  + assert_eq!(libc::pthread_mutex_unlock(&mut mutex as *mut _), 0);
  + assert_eq!(libc::pthread_mutex_trylock(&mut mutex as *mut _), 0);
  + assert_eq!(libc::pthread_mutex_lock(&mut mutex as *mut _), 0);
  + assert_eq!(libc::pthread_mutex_unlock(&mut mutex as *mut _), 0);
  + assert_eq!(libc::pthread_mutex_unlock(&mut mutex as *mut _), 0);
  + assert_eq!(libc::pthread_mutex_unlock(&mut mutex as *mut _), libc::EPERM);
  + assert_eq!(libc::pthread_mutex_destroy(&mut mutex as *mut _), 0);
  + assert_eq!(libc::pthread_mutexattr_destroy(&mut attr as *mut _), 0);
  + }
  +}
  +
  #[cfg(not(target_os = "windows"))]
  fn test_rwlock_stdlib() {
  let rw = RwLock::new(0);
  