1 files changed, 12 insertions, 0 deletions
diff --git a/test/test.rs b/test/test.rs
index 2cf30360..4c81aa2b 100644
--- a/test/test.rs
+++ b/test/test.rs
@@ -25,6 +25,7 @@ mod test_unistd;
 
 use nixtest::assert_size_of;
 use std::os::unix::io::RawFd;
+use std::sync::Mutex;
 use nix::unistd::read;
 
 /// Helper function analogous to std::io::Read::read_exact, but for `RawFD`s
@@ -37,6 +38,17 @@ fn read_exact(f: RawFd, buf: &mut  [u8]) {
     }
 }
 
+lazy_static! {
+    /// Any test that changes the process's current working directory must grab
+    /// this mutex
+    pub static ref CWD_MTX: Mutex<()> = Mutex::new(());
+    /// Any test that creates child processes must grab this mutex, regardless
+    /// of what it does with those children.
+    pub static ref FORK_MTX: Mutex<()> = Mutex::new(());
+    /// Any test that registers a SIGUSR2 handler must grab this mutex
+    pub static ref SIGUSR2_MTX: Mutex<()> = Mutex::new(());
+}
+
 #[test]
 pub fn test_size_of_long() {
     // This test is mostly here to ensure that 32bit CI is correctly