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// Copyright (C) 2019 by Josh Gao <josh@jmgao.dev>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.

//! A crate to help with fetching thread ids across multiple platforms.

#[cfg(any(target_os = "linux", target_os = "android", rustdoc))]
mod imp {
  /// Get the current thread's thread id.
  ///
  /// ```
  /// use gettid::gettid;
  /// let main_tid = gettid();
  /// let pid = std::process::id();
  /// assert_eq!(pid as u64, main_tid);
  /// let thread_tid = std::thread::spawn(gettid).join().unwrap();
  /// assert_ne!(main_tid, thread_tid);
  /// ```
  pub fn gettid() -> u64 {
    unsafe { libc::syscall(libc::SYS_gettid) as u64 }
  }
}

#[cfg(target_os = "macos")]
mod imp {
  #[link(name = "pthread")]
  extern "C" {
    fn pthread_threadid_np(thread: libc::pthread_t, thread_id: *mut libc::uint64_t) -> libc::c_int;
  }

  pub fn gettid() -> u64 {
    let mut result = 0;
    unsafe {let _ = pthread_threadid_np(0, &mut result); }
    result
  }
}

#[cfg(target_os = "windows")]
mod imp {
  pub fn gettid() -> u64 {
    unsafe { winapi::um::processthreadsapi::GetCurrentThreadId().into() }
  }
}

pub use imp::*;