Thread suspension: Implement for Linux

tests/thread_suspension/suspend_test_host.c

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "native_client/tests/thread_suspension/suspend_test.h"
 
 #include "native_client/src/include/portability_io.h"
 #include "native_client/src/shared/gio/gio.h"
@@ skipping 119 matching lines @@
 int main(int argc, char **argv) {
   struct NaClApp app;
   struct GioMemoryFileSnapshot gio_file;
 
   /* Turn off buffering to aid debugging. */
   setvbuf(stdout, NULL, _IONBF, 0);
   setvbuf(stderr, NULL, _IONBF, 0);
 
   NaClAllModulesInit();
 
+#if NACL_LINUX
+  NaClSignalHandlerInit();
+#endif
+
   if (argc != 2) {
     NaClLog(LOG_FATAL, "Expected 1 argument: executable filename\n");
   }
 
   NaClFileNameForValgrind(argv[1]);
   CHECK(GioMemoryFileSnapshotCtor(&gio_file, argv[1]));
   CHECK(NaClAppCtor(&app));
   CHECK(NaClAppLoadFile((struct Gio *) &gio_file, &app) == LOAD_OK);
   CHECK(NaClAppPrepareToLaunch(&app) == LOAD_OK);
 
@@ skipping 11 matching lines @@
 
   printf("Running TrySuspendingSyscallInvokerThread...\n");
   TrySuspendingSyscallInvokerThread(&app);
 
   /*
    * Avoid calling exit() because it runs process-global destructors
    * which might break code that is running in our unjoined threads.
    */
   NaClExit(0);
 }