ppapi/native_client/src/untrusted/irt_stub/thread_creator.c

   1 /*
   2  * Copyright (c) 2012 The Chromium Authors. All rights reserved.
   3  * Use of this source code is governed by a BSD-style license that can be
   4  * found in the LICENSE file.
   5  */
   6
   7 #include "ppapi/native_client/src/untrusted/irt_stub/thread_creator.h"
   8
   9 #include <pthread.h>
  10
  11 #include "native_client/src/include/nacl_macros.h"
  12 #include "native_client/src/untrusted/irt/irt.h"
  13
  14
  15 static int thread_create(uintptr_t *tid,
  16                          void (*func)(void *thread_argument),
  17                          void *thread_argument) {
  18   /*
  19    * We know that newlib and glibc use a small pthread_t type, so we
  20    * do not need to wrap pthread_t values.
  21    */
  22   NACL_ASSERT_SAME_SIZE(pthread_t, uintptr_t);
  23
  24   return pthread_create((pthread_t *) tid, NULL,
  25                         (void *(*)(void *thread_argument)) func,
  26                         thread_argument);
  27 }
  28
  29 static int thread_join(uintptr_t tid) {
  30   return pthread_join((pthread_t) tid, NULL);
  31 }
  32
  33 const static struct PP_ThreadFunctions thread_funcs = {
  34   thread_create,
  35   thread_join
  36 };
  37
  38 /*
  39  * We cannot tell at link time whether the application uses PPB_Audio,
  40  * because of the way that PPAPI is defined via runtime interface
  41  * query rather than a set of static functions.  This means that we
  42  * register the audio thread functions unconditionally.  This adds the
  43  * small overhead of pulling in pthread_create() even if the
  44  * application does not use PPB_Audio or libpthread.
  45  *
  46  * If an application developer wants to avoid that cost, they can
  47  * override this function with an empty definition.
  48  */
  49 void __nacl_register_thread_creator(const struct nacl_irt_ppapihook *hooks) {
  50   hooks->ppapi_register_thread_creator(&thread_funcs);
  51 }