1 // Copyright (c) 2012 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.
8 #include "base/strings/string_number_conversions.h"
9 #include "base/threading/platform_thread.h"
10 #include "ppapi/c/pp_var.h"
11 #include "ppapi/c/ppb_var.h"
12 #include "ppapi/proxy/ppapi_proxy_test.h"
13 #include "ppapi/shared_impl/ppb_var_shared.h"
16 std::string
VarToString(const PP_Var
& var
, const PPB_Var
* ppb_var
) {
18 const char* utf8
= ppb_var
->VarToUtf8(var
, &len
);
19 return std::string(utf8
, len
);
21 const size_t kNumStrings
= 100;
22 const size_t kNumThreads
= 20;
23 const int kRefsToAdd
= 20;
29 class PPB_VarTest
: public PluginProxyTest
{
32 : test_strings_(kNumStrings
), vars_(kNumStrings
),
33 ppb_var_(ppapi::PPB_Var_Shared::GetVarInterface1_2()) {
34 // Set the value of test_strings_[i] to "i".
35 for (size_t i
= 0; i
< kNumStrings
; ++i
)
36 test_strings_
[i
] = base::IntToString(i
);
39 std::vector
<std::string
> test_strings_
;
40 std::vector
<PP_Var
> vars_
;
41 const PPB_Var
* ppb_var_
;
44 // Test basic String operations.
45 TEST_F(PPB_VarTest
, Strings
) {
46 for (size_t i
= 0; i
< kNumStrings
; ++i
) {
47 vars_
[i
] = ppb_var_
->VarFromUtf8(test_strings_
[i
].c_str(),
48 test_strings_
[i
].length());
49 EXPECT_EQ(test_strings_
[i
], VarToString(vars_
[i
], ppb_var_
));
51 // At this point, they should each have a ref count of 1. Add some more.
52 for (int ref
= 0; ref
< kRefsToAdd
; ++ref
) {
53 for (size_t i
= 0; i
< kNumStrings
; ++i
) {
54 ppb_var_
->AddRef(vars_
[i
]);
55 // Make sure the string is still there with the right value.
56 EXPECT_EQ(test_strings_
[i
], VarToString(vars_
[i
], ppb_var_
));
59 for (int ref
= 0; ref
< kRefsToAdd
; ++ref
) {
60 for (size_t i
= 0; i
< kNumStrings
; ++i
) {
61 ppb_var_
->Release(vars_
[i
]);
62 // Make sure the string is still there with the right value.
63 EXPECT_EQ(test_strings_
[i
], VarToString(vars_
[i
], ppb_var_
));
66 // Now remove the ref counts for each string and make sure they are gone.
67 for (size_t i
= 0; i
< kNumStrings
; ++i
) {
68 ppb_var_
->Release(vars_
[i
]);
70 const char* utf8
= ppb_var_
->VarToUtf8(vars_
[i
], &len
);
71 EXPECT_EQ(NULL
, utf8
);
76 // PPB_VarTest.Threads tests string operations accessed by multiple threads.
78 // These three delegate classes which precede the test are for use with
79 // PlatformThread. The test goes roughly like this:
80 // 1) Spawn kNumThreads 'CreateVar' threads, giving each a roughly equal subset
81 // of test_strings_ to 'create'. Each 'CreateVar' thread also converts its
82 // set of vars back in to strings so that the main test thread can verify
83 // their values were correctly converted.
84 // 2) Spawn kNumThreads 'ChangeRefVar' threads. Each of these threads will
85 // incremement & decrement the reference count of ALL vars kRefsToAdd times.
86 // Finally, each thread adds 1 ref count. This leaves each var with a ref-
87 // count of |kNumThreads + 1|. The main test thread removes a ref, leaving
88 // each var with a ref-count of |kNumThreads|.
89 // 3) Spawn kNumThreads 'RemoveVar' threads. Each of these threads releases each
90 // var once. Once all the threads have finished, there should be no vars
92 class CreateVarThreadDelegate
: public base::PlatformThread::Delegate
{
94 // |strings_in|, |vars|, and |strings_out| are arrays, and size is their size.
95 // For each |strings_in[i]|, we will set |vars[i]| using that value. Then we
96 // read the var back out to |strings_out[i]|.
97 CreateVarThreadDelegate(PP_Module pp_module
, const std::string
* strings_in
,
98 PP_Var
* vars_out
, std::string
* strings_out
,
100 : pp_module_(pp_module
), strings_in_(strings_in
), vars_out_(vars_out
),
101 strings_out_(strings_out
), size_(size
) {
103 virtual ~CreateVarThreadDelegate() {}
104 virtual void ThreadMain() {
105 const PPB_Var
* ppb_var
= ppapi::PPB_Var_Shared::GetVarInterface1_2();
106 for (size_t i
= 0; i
< size_
; ++i
) {
107 vars_out_
[i
] = ppb_var
->VarFromUtf8(strings_in_
[i
].c_str(),
108 strings_in_
[i
].length());
109 strings_out_
[i
] = VarToString(vars_out_
[i
], ppb_var
);
113 PP_Module pp_module_
;
114 const std::string
* strings_in_
;
116 std::string
* strings_out_
;
120 // A thread that will increment and decrement the reference count of every var
122 class ChangeRefVarThreadDelegate
: public base::PlatformThread::Delegate
{
124 ChangeRefVarThreadDelegate(const std::vector
<PP_Var
>& vars
) : vars_(vars
) {
126 virtual ~ChangeRefVarThreadDelegate() {}
127 virtual void ThreadMain() {
128 const PPB_Var
* ppb_var
= ppapi::PPB_Var_Shared::GetVarInterface1_2();
129 // Increment and decrement the reference count for each var kRefsToAdd
130 // times. Note that we always AddRef once before doing the matching Release,
131 // to ensure that we never accidentally release the last reference.
132 for (int ref
= 0; ref
< kRefsToAdd
; ++ref
) {
133 for (size_t i
= 0; i
< kNumStrings
; ++i
) {
134 ppb_var
->AddRef(vars_
[i
]);
135 ppb_var
->Release(vars_
[i
]);
138 // Now add 1 ref to each Var. The net result is that all Vars will have a
139 // ref-count of (kNumThreads + 1) after this. That will allow us to have all
140 // threads release all vars later.
141 for (size_t i
= 0; i
< kNumStrings
; ++i
) {
142 ppb_var
->AddRef(vars_
[i
]);
146 std::vector
<PP_Var
> vars_
;
149 // A thread that will decrement the reference count of every var once.
150 class RemoveRefVarThreadDelegate
: public base::PlatformThread::Delegate
{
152 RemoveRefVarThreadDelegate(const std::vector
<PP_Var
>& vars
) : vars_(vars
) {
154 virtual ~RemoveRefVarThreadDelegate() {}
155 virtual void ThreadMain() {
156 const PPB_Var
* ppb_var
= ppapi::PPB_Var_Shared::GetVarInterface1_2();
157 for (size_t i
= 0; i
< kNumStrings
; ++i
) {
158 ppb_var
->Release(vars_
[i
]);
162 std::vector
<PP_Var
> vars_
;
167 TEST_F(PPB_VarTest
, Threads
) {
168 std::vector
<base::PlatformThreadHandle
> create_var_threads(kNumThreads
);
169 std::vector
<CreateVarThreadDelegate
> create_var_delegates
;
170 // The strings that the threads will re-extract from Vars (so we can check
171 // that they match the original strings).
172 std::vector
<std::string
> strings_out(kNumStrings
);
173 size_t strings_per_thread
= kNumStrings
/kNumThreads
;
174 // Give each thread an equal slice of strings to turn in to vars. (Except the
175 // last thread may get fewer if kNumStrings is not evenly divisible by
177 for (size_t slice_start
= 0; slice_start
< kNumStrings
;
178 slice_start
+= strings_per_thread
) {
179 create_var_delegates
.push_back(
180 CreateVarThreadDelegate(pp_module(),
181 &test_strings_
[slice_start
],
183 &strings_out
[slice_start
],
184 std::min(strings_per_thread
,
185 kNumStrings
- slice_start
)));
187 // Now run then join all the threads.
188 for (size_t i
= 0; i
< kNumThreads
; ++i
)
189 base::PlatformThread::Create(0, &create_var_delegates
[i
],
190 &create_var_threads
[i
]);
191 for (size_t i
= 0; i
< kNumThreads
; ++i
)
192 base::PlatformThread::Join(create_var_threads
[i
]);
193 // Now check that the strings have the expected values.
194 EXPECT_EQ(test_strings_
, strings_out
);
196 // Tinker with the reference counts in a multithreaded way.
197 std::vector
<base::PlatformThreadHandle
> change_ref_var_threads(kNumThreads
);
198 std::vector
<ChangeRefVarThreadDelegate
> change_ref_var_delegates
;
199 for (size_t i
= 0; i
< kNumThreads
; ++i
)
200 change_ref_var_delegates
.push_back(ChangeRefVarThreadDelegate(vars_
));
201 for (size_t i
= 0; i
< kNumThreads
; ++i
) {
202 base::PlatformThread::Create(0, &change_ref_var_delegates
[i
],
203 &change_ref_var_threads
[i
]);
205 for (size_t i
= 0; i
< kNumThreads
; ++i
)
206 base::PlatformThread::Join(change_ref_var_threads
[i
]);
208 // Now each var has a refcount of (kNumThreads + 1). Let's decrement each var
209 // once so that every 'RemoveRef' thread (spawned below) owns 1 reference, and
210 // when the last one removes a ref, the Var will be deleted.
211 for (size_t i
= 0; i
< kNumStrings
; ++i
) {
212 ppb_var_
->Release(vars_
[i
]);
215 // Check that all vars are still valid and have the values we expect.
216 for (size_t i
= 0; i
< kNumStrings
; ++i
)
217 EXPECT_EQ(test_strings_
[i
], VarToString(vars_
[i
], ppb_var_
));
219 // Remove the last reference counts for all vars.
220 std::vector
<base::PlatformThreadHandle
> remove_ref_var_threads(kNumThreads
);
221 std::vector
<RemoveRefVarThreadDelegate
> remove_ref_var_delegates
;
222 for (size_t i
= 0; i
< kNumThreads
; ++i
)
223 remove_ref_var_delegates
.push_back(RemoveRefVarThreadDelegate(vars_
));
224 for (size_t i
= 0; i
< kNumThreads
; ++i
) {
225 base::PlatformThread::Create(0, &remove_ref_var_delegates
[i
],
226 &remove_ref_var_threads
[i
]);
228 for (size_t i
= 0; i
< kNumThreads
; ++i
)
229 base::PlatformThread::Join(remove_ref_var_threads
[i
]);
231 // All the vars should no longer represent valid strings.
232 for (size_t i
= 0; i
< kNumStrings
; ++i
) {
234 const char* utf8
= ppb_var_
->VarToUtf8(vars_
[i
], &len
);
235 EXPECT_EQ(NULL
, utf8
);