Merge pull request #2981 from John-Colvin/patch-9

add exit_group to core.sys.linux.unistd

Author: thewilsonator

changelog/add_exit_group.dd

@@ -0,0 +1,3 @@
+add `exit_group` to `core.sys.linux.unistd`
+
+add `exit_group` to `core.sys.linux.unistd`, exits all threads in a process, present since linux 2.5.35

src/core/sys/linux/unistd.d

@@ -19,3 +19,6 @@ enum {
 
 /// Prompt for a password without echoing it.
 char* getpass(const(char)* prompt);
+
+// Exit all threads in a process
+void exit_group(int status);