linux/android adding pthread_spin_lock api

closes #2229

Author: devnexen

libc-test/build.rs

@@ -2600,6 +2600,8 @@ fn test_linux(target: &str) {
             // (`c_uint`) and this clashes with the type of the `rlimit` APIs
             // which expect a `c_int` even though both are ABI compatible.
             "__rlimit_resource_t" => true,
+            // on Linux, this is a volatile int
+            "pthread_spinlock_t" => true,
 
             _ => false,
         }

src/unix/linux_like/android/b32/mod.rs

@@ -120,6 +120,10 @@ s! {
         __reserved: [::c_char; 12],
     }
 
+    pub struct pthread_spinlock_t {
+        __private: [i32; 2],
+    }
+
     pub struct passwd {
         pub pw_name: *mut ::c_char,
         pub pw_passwd: *mut ::c_char,

src/unix/linux_like/android/b64/mod.rs

@@ -105,6 +105,10 @@ s! {
         pub f_namemax: ::c_ulong,
         __f_spare: [::c_int; 6],
     }
+
+    pub struct pthread_spinlock_t {
+        __private: i64,
+    }
 }
 
 s_no_extra_traits! {

src/unix/linux_like/android/mod.rs

@@ -2677,6 +2677,11 @@ extern "C" {
         lock: *mut pthread_mutex_t,
         abstime: *const ::timespec,
     ) -> ::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;
     pub fn clone(
         cb: extern "C" fn(*mut ::c_void) -> ::c_int,
         child_stack: *mut ::c_void,

src/unix/linux_like/linux/mod.rs

@@ -14,6 +14,7 @@ pub type nl_item = ::c_int;
 pub type idtype_t = ::c_uint;
 pub type loff_t = ::c_longlong;
 pub type pthread_key_t = ::c_uint;
+pub type pthread_spinlock_t = ::c_int;
 
 pub type __u8 = ::c_uchar;
 pub type __u16 = ::c_ushort;
@@ -3557,6 +3558,11 @@ extern "C" {
         lock: *mut pthread_mutex_t,
         abstime: *const ::timespec,
     ) -> ::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;
     pub fn clone(
         cb: extern "C" fn(*mut ::c_void) -> ::c_int,
         child_stack: *mut ::c_void,