Function thread_spawn

euralios_std/src/syscalls.rs:178–212

Spawn a new thread with a given entry point # Returns Ok(thread_id) or Err(error_code)

(
    func: extern "C" fn(usize) -> (),
    param: usize
)

///  Ok(thread_id) or Err(error_code)
///
pub fn thread_spawn(
    func: extern "C" fn(usize) -> (),
    param: usize
) -> Result<u64, SyscallError> {

    let tid: u64;
    let errcode: u64;
    unsafe {
        asm!("syscall",
             // rax = 0 indicates no error
             "cmp rax, 0",
             "jnz 2f",
             // rdi = 0 for new thread
             "cmp rdi, 0",
             "jnz 2f",
             // New thread
             "mov rdi, r9", // Function argument
             "call r8",
             "mov rax, 1", // exit_current_thread syscall
             "syscall",
             // New thread never leaves this asm block
             "2:",
             in("rax") SYSCALL_FORK_THREAD,
             in("r8") func,
             in("r9") param,
             lateout("rax") errcode,
             lateout("rdi") tid,
             out("rcx") _,
             out("r11") _);
    }
    if errcode != 0 {
        return Err(SyscallError(errcode));
    }
    Ok(tid)
}

/// Exit the current thread. Never returns.
pub fn thread_exit() -> ! {