Add tgkill syscall.
Use tgkill instead of tkill to implement pthread_kill.
This is safer in the event that the thread has already terminated
and its id has been reused by a different process.
Change-Id: Ied715e11d7eadeceead79f33db5e2b5722954ac9
diff --git a/libc/include/sys/linux-unistd.h b/libc/include/sys/linux-unistd.h
index ae9077f..f463127 100644
--- a/libc/include/sys/linux-unistd.h
+++ b/libc/include/sys/linux-unistd.h
@@ -32,6 +32,7 @@
void* __brk (void*);
int kill (pid_t, int);
int tkill (pid_t tid, int sig);
+int tgkill (pid_t tgid, pid_t tid, int sig);
int __ptrace (int request, int pid, void* addr, void* data);
int __set_thread_area (void* user_desc);
int __getpriority (int, int);