Auto merge of #2245 - devnexen:pthread_spinlock_fbsd, r=JohnTitor

freebsd adding pthread_spinlock api

Author: bors

libc-test/build.rs

@@ -2002,6 +2002,9 @@ fn test_freebsd(target: &str) {
             // not available until FreeBSD 12, and is an anonymous union there.
             ("xucred", "cr_pid__c_anonymous_union") => true,
 
+            // m_owner field is a volatile __lwpid_t
+            ("umutex", "m_owner") => true,
+
             _ => false,
         }
     });

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -21,6 +21,8 @@ pub type mqd_t = *mut ::c_void;
 pub type posix_spawnattr_t = *mut ::c_void;
 pub type posix_spawn_file_actions_t = *mut ::c_void;
 
+pub type pthread_spinlock_t = *mut __c_anonymous_pthread_spinlock;
+
 s! {
     pub struct aiocb {
         pub aio_fildes: ::c_int,
@@ -140,6 +142,21 @@ s! {
     pub struct cap_rights_t {
         cr_rights: [u64; 2],
     }
+
+    pub struct umutex {
+        m_owner: ::lwpid_t,
+        m_flags: u32,
+        m_ceilings: [u32; 2],
+        m_rb_link: ::uintptr_t,
+        #[cfg(target_pointer_width = "32")]
+        m_pad: u32,
+        m_spare: [u32; 2],
+
+    }
+
+    pub struct __c_anonymous_pthread_spinlock {
+        s_clock: umutex,
+    }
 }
 
 s_no_extra_traits! {
@@ -1588,6 +1605,12 @@ extern "C" {
         cpusetp: *const cpuset_t,
     ) -> ::c_int;
 
+    pub fn pthread_spin_init(lock: *mut pthread_spinlock_t, pshared: ::c_int) -> ::c_int;
+    pub fn pthread_spin_destroy(lock: *mut pthread_spinlock_t) -> ::c_int;
+    pub fn pthread_spin_lock(lock: *mut pthread_spinlock_t) -> ::c_int;
+    pub fn pthread_spin_trylock(lock: *mut pthread_spinlock_t) -> ::c_int;
+    pub fn pthread_spin_unlock(lock: *mut pthread_spinlock_t) -> ::c_int;
+
     #[cfg_attr(all(target_os = "freebsd", freebsd11), link_name = "statfs@FBSD_1.0")]
     pub fn statfs(path: *const ::c_char, buf: *mut statfs) -> ::c_int;
     #[cfg_attr(all(target_os = "freebsd", freebsd11), link_name = "fstatfs@FBSD_1.0")]