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| 1 /* |
| 2 * Copyright (c) 2014 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 <pthread.h> |
| 8 |
| 9 #include "irt_syscalls.h" |
| 10 #include "ppapi/c/pp_module.h" |
| 11 #include "ppapi/c/ppp.h" |
| 12 |
| 13 struct PP_StartFunctions { |
| 14 int32_t (*PPP_InitializeModule)(PP_Module module_id, |
| 15 PPB_GetInterface get_browser_interface); |
| 16 void (*PPP_ShutdownModule)(); |
| 17 const void* (*PPP_GetInterface)(const char* interface_name); |
| 18 }; |
| 19 |
| 20 struct PP_ThreadFunctions { |
| 21 /* |
| 22 * This is a cut-down version of pthread_create()/pthread_join(). |
| 23 * We omit thread creation attributes and the thread's return value. |
| 24 * |
| 25 * We use uintptr_t as the thread ID type because pthread_t is not |
| 26 * part of the stable ABI; a user thread library might choose an |
| 27 * arbitrary size for its own pthread_t. |
| 28 */ |
| 29 int (*thread_create)(uintptr_t* tid, |
| 30 void (*func)(void* thread_argument), |
| 31 void* thread_argument); |
| 32 int (*thread_join)(uintptr_t tid); |
| 33 }; |
| 34 |
| 35 #define NACL_IRT_PPAPIHOOK_v0_1 "nacl-irt-ppapihook-0.1" |
| 36 struct nacl_irt_ppapihook { |
| 37 int (*ppapi_start)(const struct PP_StartFunctions*); |
| 38 void (*ppapi_register_thread_creator)(const struct PP_ThreadFunctions*); |
| 39 }; |
| 40 |
| 41 |
| 42 static int thread_create(uintptr_t *tid, |
| 43 void (*func)(void *thread_argument), |
| 44 void *thread_argument) { |
| 45 /* |
| 46 * We know that newlib and glibc use a small pthread_t type, so we |
| 47 * do not need to wrap pthread_t values. |
| 48 */ |
| 49 return pthread_create((pthread_t *) tid, NULL, |
| 50 (void *(*)(void *thread_argument)) func, |
| 51 thread_argument); |
| 52 } |
| 53 |
| 54 static int thread_join(uintptr_t tid) { |
| 55 return pthread_join((pthread_t) tid, NULL); |
| 56 } |
| 57 |
| 58 /* |
| 59 * These are dangling references to functions that the application must define. |
| 60 */ |
| 61 static const struct PP_StartFunctions ppapi_app_start_callbacks = { |
| 62 PPP_InitializeModule, |
| 63 PPP_ShutdownModule, |
| 64 PPP_GetInterface |
| 65 }; |
| 66 |
| 67 const static struct PP_ThreadFunctions thread_funcs = { |
| 68 thread_create, |
| 69 thread_join |
| 70 }; |
| 71 |
| 72 static void fatal_error(const char *message) { |
| 73 write(2, message, strlen(message)); |
| 74 _exit(127); |
| 75 } |
| 76 |
| 77 /* |
| 78 * We cannot tell at link time whether the application uses PPB_Audio, |
| 79 * because of the way that PPAPI is defined via runtime interface |
| 80 * query rather than a set of static functions. This means that we |
| 81 * register the audio thread functions unconditionally. This adds the |
| 82 * small overhead of pulling in pthread_create() even if the |
| 83 * application does not use PPB_Audio or libpthread. |
| 84 * |
| 85 * If an application developer wants to avoid that cost, they can |
| 86 * override this function with an empty definition. |
| 87 */ |
| 88 void __nacl_register_thread_creator(const struct nacl_irt_ppapihook *hooks) { |
| 89 hooks->ppapi_register_thread_creator(&thread_funcs); |
| 90 } |
| 91 |
| 92 int PpapiPluginStart(const struct PP_StartFunctions *funcs) { |
| 93 struct nacl_irt_ppapihook hooks; |
| 94 if (sizeof(hooks) != __nacl_irt_query(NACL_IRT_PPAPIHOOK_v0_1, |
| 95 &hooks, sizeof(hooks))) { |
| 96 fatal_error("PpapiPluginStart: PPAPI hooks not found\n"); |
| 97 } |
| 98 |
| 99 __nacl_register_thread_creator(&hooks); |
| 100 return hooks.ppapi_start(funcs); |
| 101 } |
| 102 |
| 103 |
| 104 /* |
| 105 * The application's main (or the one supplied in this library) calls this |
| 106 * to start the PPAPI world. |
| 107 */ |
| 108 int PpapiPluginMain(void) { |
| 109 return PpapiPluginStart(&ppapi_app_start_callbacks); |
| 110 } |
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