Check current pid at libc initialization for 32-bit build.

Although there is a test pthread.pthread_mutex_owner_tid_limit
to check pid_max, but bionic-unit-tests hangs before reaching
that test. So abort at libc initialization if not able to reach
the test when running bionic-unit-tests32. It is more friendly
for debugging.

Bug: 24016357
Change-Id: Ia70c2e36fd8a3a040d41ea5722c7b48a6134e102

libc/bionic/libc_init_common.cpp

@@ -83,6 +83,15 @@ void __libc_init_globals(KernelArgumentBlock& args) {
   });
 }
 
+#if !defined(__LP64__)
+static void __check_max_thread_id() {
+  if (gettid() > 65535) {
+    __libc_fatal("Limited by the size of pthread_mutex_t, 32 bit bionic libc only accepts "
+                 "pid <= 65535, but current pid is %d", gettid());
+  }
+}
+#endif
+
 void __libc_init_common(KernelArgumentBlock& args) {
   // Initialize various globals.
   environ = args.envp;
@@ -90,6 +99,10 @@ void __libc_init_common(KernelArgumentBlock& args) {
   __progname = args.argv[0] ? args.argv[0] : "<unknown>";
   __abort_message_ptr = args.abort_message_ptr;
 
+#if !defined(__LP64__)
+  __check_max_thread_id();
+#endif
+
   // Get the main thread from TLS and add it to the thread list.
   pthread_internal_t* main_thread = __get_thread();
   __pthread_internal_add(main_thread);