fn futex_wait(&mut self, sync_addr: RemotePtr<i32>, sync_val: i32) -> Result<(), ()> {
        // Wait for *sync_addr == sync_val.  This implementation isn't
        // pretty, but it's pretty much the best we can do with
        // available kernel tools.
        //
        // TODO: find clever way to avoid busy-waiting.
        loop {
            let mut ok = true;
            let mem = read_val_mem(self, sync_addr, Some(&mut ok));
            if !ok {
                // Invalid addresses are just ignored by the kernel
                return Err(());
            }

            if sync_val == mem {
                break;
            }

            // Try to give our scheduling slot to the kernel
            // thread that's going to write sync_addr.
            sched_yield().unwrap();
        }

        Ok(())
    }
/// Wait for `sync_addr` in `self` address space to have the value
/// `sync_val`.
///
/// WARNING: this implementation semi-busy-waits for the value
/// change.  This must only be used in contexts where the futex
/// will change "soon".


this implementation semi-busy-waits for the value
change.  This must only be used in contexts where the futex
will change "soon".
this implementation semi - busy - waits for the value change . This must only be used in contexts where the futex will change " soon " .
fn futex_wait(&mut self, sync_addr: RemotePtr<i32>, sync_val: i32) -> Result<(), ()> {
        // Wait for *sync_addr == sync_val.  This implementation isn't
        // pretty, but it's pretty much the best we can do with
        // available kernel tools.
        //
        // TODO: find clever way to avoid busy-waiting.
        loop {
            let mut ok = true;
            let mem = read_val_mem(self, sync_addr, Some(&mut ok));
            if !ok {
                // Invalid addresses are just ignored by the kernel
                return Err(());
            }
            if sync_val == mem {
                break;
            }
            // Try to give our scheduling slot to the kernel
            // thread that's going to write sync_addr.
            sched_yield().unwrap();
        }
        Ok(())
    }
fn futex_wait ( & mut self , sync_addr : RemotePtr < i32 > , sync_val : i32 ) -> Result < ( ) , ( ) > { // Wait for *sync_addr == sync_val.  This implementation isn't // pretty, but it's pretty much the best we can do with // available kernel tools. // // TODO: find clever way to avoid busy-waiting. loop { let mut ok = true ; let mem = read_val_mem ( self , sync_addr , Some ( & mut ok ) ) ; if ! ok { // Invalid addresses are just ignored by the kernel return Err ( ( ) ) ; } if sync_val == mem { break ; } // Try to give our scheduling slot to the kernel // thread that's going to write sync_addr. sched_yield ( ) . unwrap ( ) ; } Ok ( ( ) ) }
Wait for `sync_addr` in `self` address space to have the value
`sync_val`.
Wait for ` sync_addr ` in ` self ` address space to have the value ` sync_val ` .
&mut self
sync_addr
RemotePtr<i32>
sync_val
i32