Add declaration of tgkill to signal.h.
Expose a useful function that we've had since Jelly Bean.
Bug: http://b/34111810
Test: TreeHugger
Change-Id: Iaf3097f224c09b533f36050cf21394ba148007ad
diff --git a/libc/include/signal.h b/libc/include/signal.h
index 7ae50de..ffce1fa 100644
--- a/libc/include/signal.h
+++ b/libc/include/signal.h
@@ -150,6 +150,7 @@
int raise(int);
int kill(pid_t, int);
int killpg(int, int);
+int tgkill(int tgid, int tid, int sig) __INTRODUCED_IN_32(16);
int sigaltstack(const stack_t*, stack_t*);