1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "mojo/system/data_pipe_consumer_dispatcher.h"
6
7 #include "base/logging.h"
8 #include "mojo/system/data_pipe.h"
9 #include "mojo/system/memory.h"
10
11 namespace mojo {
12 namespace system {
13
DataPipeConsumerDispatcher()14 DataPipeConsumerDispatcher::DataPipeConsumerDispatcher() {
15 }
16
Init(scoped_refptr<DataPipe> data_pipe)17 void DataPipeConsumerDispatcher::Init(scoped_refptr<DataPipe> data_pipe) {
18 DCHECK(data_pipe.get());
19 data_pipe_ = data_pipe;
20 }
21
~DataPipeConsumerDispatcher()22 DataPipeConsumerDispatcher::~DataPipeConsumerDispatcher() {
23 // |Close()|/|CloseImplNoLock()| should have taken care of the pipe.
24 DCHECK(!data_pipe_.get());
25 }
26
CancelAllWaitersNoLock()27 void DataPipeConsumerDispatcher::CancelAllWaitersNoLock() {
28 lock().AssertAcquired();
29 data_pipe_->ConsumerCancelAllWaiters();
30 }
31
CloseImplNoLock()32 MojoResult DataPipeConsumerDispatcher::CloseImplNoLock() {
33 lock().AssertAcquired();
34 data_pipe_->ConsumerClose();
35 data_pipe_ = NULL;
36 return MOJO_RESULT_OK;
37 }
38
ReadDataImplNoLock(void * elements,uint32_t * num_elements,MojoReadDataFlags flags)39 MojoResult DataPipeConsumerDispatcher::ReadDataImplNoLock(
40 void* elements,
41 uint32_t* num_elements,
42 MojoReadDataFlags flags) {
43 lock().AssertAcquired();
44
45 if (!VerifyUserPointer<uint32_t>(num_elements, 1))
46 return MOJO_RESULT_INVALID_ARGUMENT;
47 // These flags are mutally exclusive.
48 if ((flags & MOJO_READ_DATA_FLAG_DISCARD) &&
49 (flags & MOJO_READ_DATA_FLAG_QUERY))
50 return MOJO_RESULT_INVALID_ARGUMENT;
51 if ((flags & MOJO_READ_DATA_FLAG_DISCARD) ||
52 (flags & MOJO_READ_DATA_FLAG_QUERY)) {
53 DVLOG_IF(2, elements) << "Discard/query mode: ignoring non-null |elements|";
54 elements = NULL; // Null it out for safety.
55 } else {
56 // Only verify |elements| if we're neither discarding nor querying.
57 if (!VerifyUserPointerForSize(elements, data_pipe_->element_size(),
58 *num_elements))
59 return MOJO_RESULT_INVALID_ARGUMENT;
60 }
61
62 return data_pipe_->ConsumerReadData(elements, num_elements, flags);
63 }
64
BeginReadDataImplNoLock(const void ** buffer,uint32_t * buffer_num_elements,MojoReadDataFlags flags)65 MojoResult DataPipeConsumerDispatcher::BeginReadDataImplNoLock(
66 const void** buffer,
67 uint32_t* buffer_num_elements,
68 MojoReadDataFlags flags) {
69 lock().AssertAcquired();
70
71 if (!VerifyUserPointer<const void*>(buffer, 1))
72 return MOJO_RESULT_INVALID_ARGUMENT;
73 if (!VerifyUserPointer<uint32_t>(buffer_num_elements, 1))
74 return MOJO_RESULT_INVALID_ARGUMENT;
75 // These flags may not be used in two-phase mode.
76 if ((flags & MOJO_READ_DATA_FLAG_DISCARD) ||
77 (flags & MOJO_READ_DATA_FLAG_QUERY))
78 return MOJO_RESULT_INVALID_ARGUMENT;
79
80 return data_pipe_->ConsumerBeginReadData(buffer, buffer_num_elements, flags);
81 }
82
EndReadDataImplNoLock(uint32_t num_elements_read)83 MojoResult DataPipeConsumerDispatcher::EndReadDataImplNoLock(
84 uint32_t num_elements_read) {
85 lock().AssertAcquired();
86
87 return data_pipe_->ConsumerEndReadData(num_elements_read);
88 }
89
AddWaiterImplNoLock(Waiter * waiter,MojoWaitFlags flags,MojoResult wake_result)90 MojoResult DataPipeConsumerDispatcher::AddWaiterImplNoLock(
91 Waiter* waiter,
92 MojoWaitFlags flags,
93 MojoResult wake_result) {
94 lock().AssertAcquired();
95 return data_pipe_->ConsumerAddWaiter(waiter, flags, wake_result);
96 }
97
RemoveWaiterImplNoLock(Waiter * waiter)98 void DataPipeConsumerDispatcher::RemoveWaiterImplNoLock(Waiter* waiter) {
99 lock().AssertAcquired();
100 data_pipe_->ConsumerRemoveWaiter(waiter);
101 }
102
103 scoped_refptr<Dispatcher>
CreateEquivalentDispatcherAndCloseImplNoLock()104 DataPipeConsumerDispatcher::CreateEquivalentDispatcherAndCloseImplNoLock() {
105 lock().AssertAcquired();
106
107 scoped_refptr<DataPipeConsumerDispatcher> rv =
108 new DataPipeConsumerDispatcher();
109 rv->Init(data_pipe_);
110 data_pipe_ = NULL;
111 return scoped_refptr<Dispatcher>(rv.get());
112 }
113
114 } // namespace system
115 } // namespace mojo
116