NaCl: create a separate namespace for Mojo handles.

mojo/edk/embedder/system_impl_private_entrypoints.cc

Index: mojo/edk/embedder/system_impl_private_entrypoints.cc
diff --git a/mojo/edk/embedder/system_impl_private_entrypoints.cc b/mojo/edk/embedder/system_impl_private_entrypoints.cc
new file mode 100644
index 0000000000000000000000000000000000000000..475ffa76b06b5bb21763e23298ce294670b06980
--- /dev/null
+++ b/mojo/edk/embedder/system_impl_private_entrypoints.cc
@@ -0,0 +1,260 @@
+// Copyright 2015 The Chromium 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 "mojo/edk/embedder/embedder_internal.h"
+#include "mojo/edk/system/core.h"
+#include "mojo/edk/system/dispatcher.h"
+#include "mojo/public/c/system/buffer.h"
+#include "mojo/public/c/system/data_pipe.h"
+#include "mojo/public/c/system/functions.h"
+#include "mojo/public/c/system/message_pipe.h"
+#include "mojo/public/platform/native/system_impl_private.h"
+
+using mojo::embedder::internal::g_core;
+using mojo::system::Core;
+using mojo::system::Dispatcher;
+using mojo::system::MakeUserPointer;
+
+// Definitions of the system functions, but with an explicit parameter for the
+// core object rather than using the default singleton. Also includes functions
+// for manipulating core objects.
+extern "C" {
+
+MojoSystemImpl MojoSystemImplGetDefaultImpl() {
+  return static_cast<MojoSystemImpl>(g_core);
+}
+
+MojoSystemImpl MojoSystemImplCreateImpl() {
+  Core* created_core = new Core(g_core->platform_support());
+  return static_cast<MojoSystemImpl>(created_core);
+}
+
+MojoResult MojoSystemImplTransferHandle(MojoSystemImpl from_system,
+                                        MojoHandle handle,
+                                        MojoSystemImpl to_system,
+                                        MojoHandle* result_handle) {
+  Core* from_core = static_cast<Core*>(from_system);
+  if (from_core == nullptr)
+    return MOJO_RESULT_INVALID_ARGUMENT;
+
+  if (handle == MOJO_HANDLE_INVALID)
+    return MOJO_RESULT_INVALID_ARGUMENT;
+
+  Core* to_core = static_cast<Core*>(to_system);
+  if (to_core == nullptr)
+    return MOJO_RESULT_INVALID_ARGUMENT;
+
+  if (result_handle == nullptr)
+    return MOJO_RESULT_INVALID_ARGUMENT;
+
+  scoped_refptr<Dispatcher> d;
+  MojoResult result = from_core->GetAndRemoveDispatcher(handle, &d);
+  if (result != MOJO_RESULT_OK)
+    return result;
+
+  MojoHandle created_handle = to_core->AddDispatcher(d);
+  if (created_handle == MOJO_HANDLE_INVALID) {
+    // The handle has been lost, unfortunately. There's no guarentee we can put
+    // it back where it came from, or get the original ID back. Holding locks
+    // for multiple cores risks deadlock, so that isn't a solution. This case
+    // should not happen for reasonable uses of this API, however.
+    LOG(ERROR) << "Could not transfer handle";
+    d->Close();
+    return MOJO_RESULT_RESOURCE_EXHAUSTED;
+  }
+
+  MakeUserPointer(result_handle).Put(created_handle);
+  return MOJO_RESULT_OK;
+}
+
+MojoTimeTicks MojoSystemImplGetTimeTicksNow(MojoSystemImpl system) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->GetTimeTicksNow();
+}
+
+MojoResult MojoSystemImplClose(MojoSystemImpl system, MojoHandle handle) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->Close(handle);
+}
+
+MojoResult MojoSystemImplWait(MojoSystemImpl system,
+                              MojoHandle handle,
+                              MojoHandleSignals signals,
+                              MojoDeadline deadline,
+                              MojoHandleSignalsState* signals_state) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->Wait(handle, signals, deadline, MakeUserPointer(signals_state));
+}
+
+MojoResult MojoSystemImplWaitMany(MojoSystemImpl system,
+                                  const MojoHandle* handles,
+                                  const MojoHandleSignals* signals,
+                                  uint32_t num_handles,
+                                  MojoDeadline deadline,
+                                  uint32_t* result_index,
+                                  MojoHandleSignalsState* signals_states) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->WaitMany(MakeUserPointer(handles), MakeUserPointer(signals),
+                        num_handles, deadline, MakeUserPointer(result_index),
+                        MakeUserPointer(signals_states));
+}
+
+MojoResult MojoSystemImplCreateMessagePipe(
+    MojoSystemImpl system,
+    const MojoCreateMessagePipeOptions* options,
+    MojoHandle* message_pipe_handle0,
+    MojoHandle* message_pipe_handle1) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->CreateMessagePipe(MakeUserPointer(options),
+                                 MakeUserPointer(message_pipe_handle0),
+                                 MakeUserPointer(message_pipe_handle1));
+}
+
+MojoResult MojoSystemImplWriteMessage(MojoSystemImpl system,
+                                      MojoHandle message_pipe_handle,
+                                      const void* bytes,
+                                      uint32_t num_bytes,
+                                      const MojoHandle* handles,
+                                      uint32_t num_handles,
+                                      MojoWriteMessageFlags flags) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->WriteMessage(message_pipe_handle, MakeUserPointer(bytes),
+                            num_bytes, MakeUserPointer(handles), num_handles,
+                            flags);
+}
+
+MojoResult MojoSystemImplReadMessage(MojoSystemImpl system,
+                                     MojoHandle message_pipe_handle,
+                                     void* bytes,
+                                     uint32_t* num_bytes,
+                                     MojoHandle* handles,
+                                     uint32_t* num_handles,
+                                     MojoReadMessageFlags flags) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->ReadMessage(message_pipe_handle, MakeUserPointer(bytes),
+                           MakeUserPointer(num_bytes), MakeUserPointer(handles),
+                           MakeUserPointer(num_handles), flags);
+}
+
+MojoResult MojoSystemImplCreateDataPipe(
+    MojoSystemImpl system,
+    const MojoCreateDataPipeOptions* options,
+    MojoHandle* data_pipe_producer_handle,
+    MojoHandle* data_pipe_consumer_handle) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->CreateDataPipe(MakeUserPointer(options),
+                              MakeUserPointer(data_pipe_producer_handle),
+                              MakeUserPointer(data_pipe_consumer_handle));
+}
+
+MojoResult MojoSystemImplWriteData(MojoSystemImpl system,
+                                   MojoHandle data_pipe_producer_handle,
+                                   const void* elements,
+                                   uint32_t* num_elements,
+                                   MojoWriteDataFlags flags) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->WriteData(data_pipe_producer_handle, MakeUserPointer(elements),
+                         MakeUserPointer(num_elements), flags);
+}
+
+MojoResult MojoSystemImplBeginWriteData(MojoSystemImpl system,
+                                        MojoHandle data_pipe_producer_handle,
+                                        void** buffer,
+                                        uint32_t* buffer_num_elements,
+                                        MojoWriteDataFlags flags) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->BeginWriteData(data_pipe_producer_handle,
+                              MakeUserPointer(buffer),
+                              MakeUserPointer(buffer_num_elements), flags);
+}
+
+MojoResult MojoSystemImplEndWriteData(MojoSystemImpl system,
+                                      MojoHandle data_pipe_producer_handle,
+                                      uint32_t num_elements_written) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->EndWriteData(data_pipe_producer_handle, num_elements_written);
+}
+
+MojoResult MojoSystemImplReadData(MojoSystemImpl system,
+                                  MojoHandle data_pipe_consumer_handle,
+                                  void* elements,
+                                  uint32_t* num_elements,
+                                  MojoReadDataFlags flags) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->ReadData(data_pipe_consumer_handle, MakeUserPointer(elements),
+                        MakeUserPointer(num_elements), flags);
+}
+
+MojoResult MojoSystemImplBeginReadData(MojoSystemImpl system,
+                                       MojoHandle data_pipe_consumer_handle,
+                                       const void** buffer,
+                                       uint32_t* buffer_num_elements,
+                                       MojoReadDataFlags flags) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->BeginReadData(data_pipe_consumer_handle, MakeUserPointer(buffer),
+                             MakeUserPointer(buffer_num_elements), flags);
+}
+
+MojoResult MojoSystemImplEndReadData(MojoSystemImpl system,
+                                     MojoHandle data_pipe_consumer_handle,
+                                     uint32_t num_elements_read) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->EndReadData(data_pipe_consumer_handle, num_elements_read);
+}
+
+MojoResult MojoSystemImplCreateSharedBuffer(
+    MojoSystemImpl system,
+    const MojoCreateSharedBufferOptions* options,
+    uint64_t num_bytes,
+    MojoHandle* shared_buffer_handle) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->CreateSharedBuffer(MakeUserPointer(options), num_bytes,
+                                  MakeUserPointer(shared_buffer_handle));
+}
+
+MojoResult MojoSystemImplDuplicateBufferHandle(
+    MojoSystemImpl system,
+    MojoHandle buffer_handle,
+    const MojoDuplicateBufferHandleOptions* options,
+    MojoHandle* new_buffer_handle) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->DuplicateBufferHandle(buffer_handle, MakeUserPointer(options),
+                                     MakeUserPointer(new_buffer_handle));
+}
+
+MojoResult MojoSystemImplMapBuffer(MojoSystemImpl system,
+                                   MojoHandle buffer_handle,
+                                   uint64_t offset,
+                                   uint64_t num_bytes,
+                                   void** buffer,
+                                   MojoMapBufferFlags flags) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->MapBuffer(buffer_handle, offset, num_bytes,
+                         MakeUserPointer(buffer), flags);
+}
+
+MojoResult MojoSystemImplUnmapBuffer(MojoSystemImpl system, void* buffer) {
+  mojo::system::Core* core = static_cast<mojo::system::Core*>(system);
+  DCHECK(core);
+  return core->UnmapBuffer(MakeUserPointer(buffer));
+}
+
+}  // extern "C"