Thread suspension: Implement for Linux

src/trusted/service_runtime/nacl_app_thread.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.
  */
 
 /*
  * NaCl Server Runtime user thread state.
  */
 #include "native_client/src/shared/platform/nacl_check.h"
 #include "native_client/src/shared/platform/nacl_exit.h"
 #include "native_client/src/shared/platform/nacl_sync_checked.h"
 
 #include "native_client/src/trusted/service_runtime/arch/sel_ldr_arch.h"
 #include "native_client/src/trusted/service_runtime/nacl_desc_effector_ldr.h"
 #include "native_client/src/trusted/service_runtime/nacl_globals.h"
 #include "native_client/src/trusted/service_runtime/nacl_oop_debugger_hooks.h"
 #include "native_client/src/trusted/service_runtime/nacl_tls.h"
 #include "native_client/src/trusted/service_runtime/nacl_switch_to_app.h"
 #include "native_client/src/trusted/service_runtime/nacl_stack_safety.h"
 #include "native_client/src/trusted/service_runtime/nacl_syscall_common.h"
 
 
-void NaClAppThreadSetSuspendState(struct NaClAppThread *natp,
-                                  enum NaClSuspendState old_state,
-                                  enum NaClSuspendState new_state) {
-#if NACL_WINDOWS
-  NaClXMutexLock(&natp->mu);
-  while ((natp->suspend_state & NACL_APP_THREAD_SUSPENDING) != 0) {
-    /*
-     * We are being suspended, but SuspendThread() has not taken effect yet.
-     */
-    NaClXCondVarWait(&natp->cv, &natp->mu);
-  }
-  DCHECK(natp->suspend_state == old_state);
-  natp->suspend_state = new_state;
-  NaClXMutexUnlock(&natp->mu);
-#else
-  UNREFERENCED_PARAMETER(natp);
-  UNREFERENCED_PARAMETER(old_state);
-  UNREFERENCED_PARAMETER(new_state);
-#endif
-}
-
-
 void WINAPI NaClThreadLauncher(void *state) {
   struct NaClAppThread *natp = (struct NaClAppThread *) state;
   uint32_t thread_idx;
   NaClLog(4, "NaClThreadLauncher: entered\n");
 
   NaClSignalStackRegister(natp->signal_stack);
 
   NaClLog(4, "      natp = 0x%016"NACL_PRIxPTR"\n", (uintptr_t) natp);
   NaClLog(4, " prog_ctr  = 0x%016"NACL_PRIxNACL_REG"\n", natp->user.prog_ctr);
   NaClLog(4, "stack_ptr  = 0x%016"NACL_PRIxPTR"\n",
@@ skipping 159 matching lines @@
   if (!NaClCondVarCtor(&natp->cv)) {
     goto cleanup_mutex;
   }
 
   natp->sysret = 0;
 
   if (!NaClSignalStackAllocate(&natp->signal_stack)) {
     goto cleanup_cv;
   }
 
-#if NACL_WINDOWS
   natp->suspend_state = NACL_APP_THREAD_TRUSTED;
-#endif
 
   natp->thread_num = -1;  /* illegal index */
   natp->sys_tls = sys_tls;
   natp->tls2 = user_tls2;
   natp->usr_tlsp = NULL;
 
   natp->dynamic_delete_generation = 0;
 
   rv = NaClThreadCtor(&natp->thread,
                       NaClThreadLauncher,
@@ skipping 20 matching lines @@
    * the thread must not be still running, else this crashes the system
    */
 
   NaClThreadDtor(&natp->thread);
   NaClSignalStackFree(natp->signal_stack);
   natp->signal_stack = NULL;
   NaClTlsFree(natp);
   NaClCondVarDtor(&natp->cv);
   NaClMutexDtor(&natp->mu);
 }