Add + Send to create_thread's function argument. (#87)

It is, after all, sent to a different thread.

Author: sunfishcode

src/arch/aarch64.rs

@@ -144,7 +144,7 @@ pub(super) unsafe fn clone(
     parent_tid: *mut RawPid,
     newtls: *mut c_void,
     child_tid: *mut RawPid,
-    fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>>>,
+    fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>> + Send>,
 ) -> isize {
     let r0;
     asm!(

src/arch/arm.rs

@@ -144,7 +144,7 @@ pub(super) unsafe fn clone(
     parent_tid: *mut RawPid,
     newtls: *mut c_void,
     child_tid: *mut RawPid,
-    fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>>>,
+    fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>> + Send>,
 ) -> isize {
     let r0;
     asm!(

src/arch/riscv64.rs

@@ -144,7 +144,7 @@ pub(super) unsafe fn clone(
     parent_tid: *mut RawPid,
     newtls: *mut c_void,
     child_tid: *mut RawPid,
-    fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>>>,
+    fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>> + Send>,
 ) -> isize {
     let r0;
     asm!(

src/arch/x86.rs

@@ -149,7 +149,7 @@ pub(super) unsafe fn clone(
     parent_tid: *mut RawPid,
     newtls: *mut c_void,
     child_tid: *mut RawPid,
-    fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>>>,
+    fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>> + Send>,
 ) -> isize {
     let mut gs: u32 = 0;
     asm!("mov {0:x}, gs", inout(reg) gs);

src/arch/x86_64.rs

@@ -147,7 +147,7 @@ pub(super) unsafe fn clone(
     parent_tid: *mut RawPid,
     child_tid: *mut RawPid,
     newtls: *mut c_void,
-    fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>>>,
+    fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>> + Send>,
 ) -> isize {
     let r0;
     asm!(

src/thread/libc.rs

@@ -68,13 +68,13 @@ impl Thread {
 ///
 /// `fn_` is called on the new thread.
 pub fn create_thread(
-    fn_: Box<dyn FnOnce() -> Option<Box<dyn Any>>>,
+    fn_: Box<dyn FnOnce() -> Option<Box<dyn Any>> + Send>,
     stack_size: usize,
     guard_size: usize,
 ) -> io::Result<Thread> {
     extern "C" fn start(arg: *mut c_void) -> *mut c_void {
         unsafe {
-            let arg = arg.cast::<Box<dyn FnOnce() -> Option<Box<dyn Any>>>>();
+            let arg = arg.cast::<Box<dyn FnOnce() -> Option<Box<dyn Any>> + Send>>();
             let arg = Box::from_raw(arg);
             match arg() {
                 None => null_mut(),

src/thread/linux_raw.rs

@@ -372,7 +372,7 @@ pub(super) unsafe fn initialize_main_thread(mem: *mut c_void) {
 ///
 /// `fn_` is called on the new thread.
 pub fn create_thread(
-    fn_: Box<dyn FnOnce() -> Option<Box<dyn Any>>>,
+    fn_: Box<dyn FnOnce() -> Option<Box<dyn Any>> + Send>,
     stack_size: usize,
     guard_size: usize,
 ) -> io::Result<Thread> {
@@ -563,7 +563,9 @@ pub fn create_thread(
 /// `fn_` must be valid to call [`Box::from_raw`] on.
 ///
 /// After calling `fn_`, this terminates the thread.
-pub(super) unsafe extern "C" fn entry(fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>>>) -> ! {
+pub(super) unsafe extern "C" fn entry(
+    fn_: *mut Box<dyn FnOnce() -> Option<Box<dyn Any>> + Send>,
+) -> ! {
     let fn_ = Box::from_raw(fn_);
 
     #[cfg(feature = "log")]