Add pthread_kill

CHANGELOG.md

@@ -8,6 +8,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 - Added `IPV6_V6ONLY` sockopt.
   (#[1470](https://github.com/nix-rust/nix/pull/1470))
+- Added `pthread_kill`.
+  (#[1472](https://github.com/nix-rust/nix/pull/1472))
 
 ### Changed
 

src/sys/signal.rs

@@ -6,6 +6,7 @@
 use crate::{Error, Result};
 use crate::errno::Errno;
 use crate::unistd::Pid;
+use crate::sys::pthread::Pthread;
 use std::convert::TryFrom;
 use std::mem;
 use std::fmt;
@@ -781,6 +782,21 @@ pub fn killpg<T: Into<Option<Signal>>>(pgrp: Pid, signal: T) -> Result<()> {
     Errno::result(res).map(drop)
 }
 
+/// Send a signal to a thread (see [`pthread_kill(3)`]).
+///
+/// If `signal` is `None`, `pthread_kill` will only preform error checking and
+/// won't send any signal.
+///
+/// [`pthread_kill(3)`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_kill.html
+pub fn pthread_kill<T: Into<Option<Signal>>>(thread: Pthread, signal: T) -> Result<()> {
+	let sig = match signal.into() {
+		Some(s) => s as libc::c_int,
+		None => 0,
+	};
+	let res = unsafe { libc::pthread_kill(thread, sig) };
+	Errno::result(res).map(drop)
+}
+
 pub fn raise(signal: Signal) -> Result<()> {
     let res = unsafe { libc::raise(signal as libc::c_int) };
 

test/sys/test_signal.rs

@@ -1,5 +1,6 @@
 #[cfg(not(target_os = "redox"))]
 use nix::errno::Errno;
+use nix::sys::pthread::pthread_self;
 use nix::sys::signal::*;
 use nix::unistd::*;
 use std::convert::TryFrom;
@@ -17,6 +18,12 @@ fn test_killpg_none() {
         .expect("Should be able to send signal to my process group.");
 }
 
+#[test]
+fn test_pthread_kill_none() {
+    pthread_kill(pthread_self(), None)
+        .expect("Should be able to send signal to my thread.");
+}
+
 #[test]
 fn test_old_sigaction_flags() {
     let _m = crate::SIGNAL_MTX.lock().expect("Mutex got poisoned by another test");