Debug stub: suspend/resume threads on Linux

src/trusted/service_runtime/linux/thread_suspension.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 <errno.h>
 #include <linux/futex.h>
 #include <signal.h>
 #include <sys/syscall.h>
@@ skipping 227 matching lines @@
   size_t index;
   for (index = 0; index < nap->threads.num_entries; index++) {
     struct NaClAppThread *natp = NaClGetThreadMu(nap, (int) index);
     if (natp != NULL) {
       NaClUntrustedThreadResume(natp);
     }
   }
 
   NaClXMutexUnlock(&nap->threads_mu);
 }
+
+
+void NaClUntrustedThreadsSuspendAll2(struct NaClApp *nap, struct NaClAppThread *signaled_natp) {
+  size_t index;
+
+  NaClXMutexLock(&nap->threads_mu);
+
+  for (index = 0; index < nap->threads.num_entries; index++) {
+    struct NaClAppThread *natp = NaClGetThreadMu(nap, (int) index);
+    if (natp != NULL && natp != signaled_natp) {
+      NaClUntrustedThreadSuspend(natp, 1/*save_registers*/);
+    }
+  }
+}
+
+void NaClUntrustedThreadsResumeAll2(struct NaClApp *nap, struct NaClAppThread *signaled_natp) {
+  size_t index;
+  for (index = 0; index < nap->threads.num_entries; index++) {
+    struct NaClAppThread *natp = NaClGetThreadMu(nap, (int) index);
+    if (natp != NULL && natp != signaled_natp) {
+      NaClUntrustedThreadResume(natp);
+    }
+  }
+
+  NaClXMutexUnlock(&nap->threads_mu);
+}