Introduce pthread_mutex APIs.

- Add support for pthread_mutex_init, pthread_mutex_destroy,
  pthread_mutex_lock, pthread_mutex_unlock and pthread_mutex_trylock.

b/302335657

Change-Id: I8774ddb8ad466b7342e045402b170a719f2e1a81

starboard/build/config/modular/BUILD.gn

@@ -185,6 +185,11 @@ config("modular") {
       "-Wl,--wrap=time",
       "-Wl,--wrap=gmtime_r",
       "-Wl,--wrap=mmap",
+      "-Wl,--wrap=pthread_mutex_destroy",
+      "-Wl,--wrap=pthread_mutex_init",
+      "-Wl,--wrap=pthread_mutex_lock",
+      "-Wl,--wrap=pthread_mutex_unlock",
+      "-Wl,--wrap=pthread_mutex_trylock",
     ]
   }
 }

starboard/elf_loader/exported_symbols.cc

@@ -46,6 +46,7 @@
 #include "starboard/player.h"
 #if SB_API_VERSION >= 16
 #include "starboard/shared/modular/posix_mmap_wrappers.h"
+#include "starboard/shared/modular/posix_pthread_wrappers.h"
 #include "starboard/shared/modular/posix_time_wrappers.h"
 
 #endif  // SB_API_VERSION >= 16
@@ -435,6 +436,16 @@ ExportedSymbols::ExportedSymbols() {
   map_["time"] = reinterpret_cast<const void*>(&__wrap_time);
   map_["gmtime_r"] = reinterpret_cast<const void*>(&__wrap_gmtime_r);
   map_["mmap"] = reinterpret_cast<const void*>(&__wrap_mmap);
+  map_["pthread_mutex_destroy"] =
+      reinterpret_cast<const void*>(&__wrap_pthread_mutex_destroy);
+  map_["pthread_mutex_init"] =
+      reinterpret_cast<const void*>(&__wrap_pthread_mutex_init);
+  map_["pthread_mutex_lock"] =
+      reinterpret_cast<const void*>(&__wrap_pthread_mutex_lock);
+  map_["pthread_mutex_unlock"] =
+      reinterpret_cast<const void*>(&__wrap_pthread_mutex_unlock);
+  map_["pthread_mutex_trylock"] =
+      reinterpret_cast<const void*>(&__wrap_pthread_mutex_trylock);
 
   REGISTER_SYMBOL(sprintf);
   REGISTER_SYMBOL(snprintf);

starboard/nplb/BUILD.gn

@@ -137,6 +137,10 @@ target(gtest_target_type, "nplb") {
     "posix_compliance/posix_arpa_inet_test.cc",
     "posix_compliance/posix_directory_create_test.cc",
     "posix_compliance/posix_memory_map_test.cc",
+    "posix_compliance/posix_mutex_acquire_test.cc",
+    "posix_compliance/posix_mutex_acquire_try_test.cc",
+    "posix_compliance/posix_mutex_create_test.cc",
+    "posix_compliance/posix_mutex_destroy_test.cc",
     "posix_compliance/posix_string_compare_no_case_n_test.cc",
     "posix_compliance/posix_string_compare_no_case_test.cc",
     "posix_compliance/posix_string_format_test.cc",

starboard/nplb/posix_compliance/posix_mutex_acquire_test.cc

@@ -0,0 +1,96 @@
+// Copyright 2015 The Cobalt Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#if SB_API_VERSION >= 16
+
+#include <pthread.h>
+
+#include "starboard/configuration.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace starboard {
+namespace nplb {
+namespace {
+
+struct TestContext {
+  TestContext() : count(0) {}
+  pthread_mutex_t mutex;
+  int count;
+};
+
+const int kLoops = 10000;
+
+void* EntryPoint(void* parameter) {
+  TestContext* context = static_cast<TestContext*>(parameter);
+
+  for (int i = 0; i < kLoops; ++i) {
+    pthread_mutex_lock(&context->mutex);
+    context->count++;
+    pthread_mutex_unlock(&context->mutex);
+  }
+
+  return NULL;
+}
+
+// This test just tries to acquire a mutex repeatedly while other threads are
+// doing the same.
+TEST(PosixMutexAcquireTest, SunnyDayContended) {
+  TestContext context;
+  EXPECT_EQ(pthread_mutex_init(&context.mutex, NULL), 0);
+  const int kThreads = 4;
+  SbThread threads[kThreads];
+  for (int i = 0; i < kThreads; ++i) {
+    threads[i] = SbThreadCreate(0, kSbThreadNoPriority, kSbThreadNoAffinity,
+                                true, NULL, EntryPoint, &context);
+  }
+
+  for (int i = 0; i < kLoops; ++i) {
+    for (int j = 0; j < kThreads; ++j) {
+      EXPECT_EQ(pthread_mutex_lock(&context.mutex), 0);
+      int k = context.count;
+      k = k - 1;
+      context.count = k;
+      EXPECT_EQ(pthread_mutex_unlock(&context.mutex), 0);
+    }
+  }
+
+  // Join other threads and clean up.
+  for (int i = 0; i < kThreads; ++i) {
+    EXPECT_TRUE(SbThreadJoin(threads[i], NULL));
+  }
+  EXPECT_EQ(pthread_mutex_destroy(&context.mutex), 0);
+  EXPECT_EQ(0, context.count);
+}
+
+TEST(PosixMutexAcquireTest, SunnyDayUncontended) {
+  pthread_mutex_t mutex;
+  EXPECT_EQ(pthread_mutex_init(&mutex, NULL), 0);
+
+  EXPECT_EQ(pthread_mutex_lock(&mutex), 0);
+  EXPECT_EQ(pthread_mutex_unlock(&mutex), 0);
+  EXPECT_EQ(pthread_mutex_destroy(&mutex), 0);
+}
+
+TEST(PosixMutexAcquireTest, SunnyDayStaticallyInitialized) {
+  pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+  EXPECT_EQ(pthread_mutex_lock(&mutex), 0);
+  EXPECT_EQ(pthread_mutex_unlock(&mutex), 0);
+  EXPECT_EQ(pthread_mutex_destroy(&mutex), 0);
+}
+
+}  // namespace
+}  // namespace nplb
+}  // namespace starboard
+
+#endif  // SB_API_VERSION >= 16

starboard/nplb/posix_compliance/posix_mutex_acquire_try_test.cc

@@ -0,0 +1,81 @@
+// Copyright 2015 The Cobalt Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#if SB_API_VERSION >= 16
+
+#include <pthread.h>
+
+#include "starboard/configuration.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#include "starboard/nplb/thread_helpers.h"
+#include "starboard/thread.h"
+
+namespace starboard {
+namespace nplb {
+namespace {
+
+struct TestContext {
+  explicit TestContext(pthread_mutex_t* mutex)
+      : was_locked_(false), mutex_(mutex) {}
+  bool was_locked_;
+  pthread_mutex_t* mutex_;
+};
+
+void* EntryPoint(void* parameter) {
+  TestContext* context = static_cast<TestContext*>(parameter);
+  context->was_locked_ = (pthread_mutex_trylock(context->mutex_) == 0);
+  return NULL;
+}
+
+TEST(PosixMutexAcquireTryTest, SunnyDayUncontended) {
+  pthread_mutex_t mutex;
+  EXPECT_EQ(pthread_mutex_init(&mutex, NULL), 0);
+
+  EXPECT_EQ(pthread_mutex_trylock(&mutex), 0);
+  EXPECT_EQ(pthread_mutex_unlock(&mutex), 0);
+  EXPECT_EQ(pthread_mutex_destroy(&mutex), 0);
+}
+
+TEST(PosixMutexAcquireTest, SunnyDayAutoInit) {
+  pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+  EXPECT_EQ(pthread_mutex_trylock(&mutex), 0);
+  EXPECT_EQ(pthread_mutex_unlock(&mutex), 0);
+  EXPECT_EQ(pthread_mutex_destroy(&mutex), 0);
+}
+
+TEST(PosixMutexAcquireTryTest, RainyDayReentrant) {
+  pthread_mutex_t mutex;
+  EXPECT_EQ(pthread_mutex_init(&mutex, NULL), 0);
+
+  EXPECT_EQ(pthread_mutex_trylock(&mutex), 0);
+
+  TestContext context(&mutex);
+  // TODO: Migrate to pthread_create when available.
+  SbThread thread =
+      SbThreadCreate(0, kSbThreadNoPriority, kSbThreadNoAffinity, true,
+                     nplb::kThreadName, &EntryPoint, &context);
+
+  EXPECT_TRUE(SbThreadIsValid(thread));
+  EXPECT_TRUE(SbThreadJoin(thread, NULL));
+  EXPECT_FALSE(context.was_locked_);
+  EXPECT_EQ(pthread_mutex_unlock(&mutex), 0);
+  EXPECT_EQ(pthread_mutex_destroy(&mutex), 0);
+}
+
+}  // namespace
+}  // namespace nplb
+}  // namespace starboard
+
+#endif  // SB_API_VERSION >= 16

starboard/nplb/posix_compliance/posix_mutex_create_test.cc

@@ -0,0 +1,65 @@
+// Copyright 2015 The Cobalt Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#if SB_API_VERSION >= 16
+
+#include <pthread.h>
+
+#include "starboard/configuration.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace starboard {
+namespace nplb {
+namespace {
+
+const int kALot = 128 * 1024;
+const int kABunch = 2 * 1024;
+
+TEST(PosixMutexCreateTest, SunnyDay) {
+  pthread_mutex_t mutex;
+  EXPECT_EQ(pthread_mutex_init(&mutex, NULL), 0);
+  EXPECT_EQ(pthread_mutex_destroy(&mutex), 0);
+}
+
+TEST(PosixMutexCreateTest, SunnyDayAutoInit) {
+  pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+
+  EXPECT_EQ(pthread_mutex_init(&mutex, NULL), 0);
+  EXPECT_EQ(pthread_mutex_destroy(&mutex), 0);
+}
+
+TEST(PosixMutexCreateTest, SunnyDayALot) {
+  for (int i = 0; i < kALot; ++i) {
+    pthread_mutex_t mutex;
+    EXPECT_EQ(pthread_mutex_init(&mutex, NULL), 0);
+    EXPECT_EQ(pthread_mutex_destroy(&mutex), 0);
+  }
+}
+
+TEST(PosixMutexCreateTest, SunnyDayABunchAtOnce) {
+  pthread_mutex_t mutexes[kABunch];
+  for (int i = 0; i < kABunch; ++i) {
+    EXPECT_EQ(pthread_mutex_init(&mutexes[i], NULL), 0);
+  }
+
+  for (int i = 0; i < kABunch; ++i) {
+    EXPECT_EQ(pthread_mutex_destroy(&mutexes[i]), 0);
+  }
+}
+
+}  // namespace
+}  // namespace nplb
+}  // namespace starboard
+
+#endif  // SB_API_VERSION >= 16

starboard/nplb/posix_compliance/posix_mutex_destroy_test.cc

@@ -0,0 +1,35 @@
+// Copyright 2015 The Cobalt Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#if SB_API_VERSION >= 16
+
+#include <pthread.h>
+
+#include "starboard/configuration.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace starboard {
+namespace nplb {
+namespace {
+
+TEST(PosixMutexDestroyTest, SunnyDayAutoInit) {
+  pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+  EXPECT_EQ(pthread_mutex_destroy(&mutex), 0);
+}
+
+}  // namespace
+}  // namespace nplb
+}  // namespace starboard
+
+#endif  // SB_API_VERSION >= 16

starboard/shared/modular/BUILD.gn

@@ -18,6 +18,8 @@ source_set("posix_wrappers") {
   sources = [
     "posix_mmap_wrappers.cc",
     "posix_mmap_wrappers.h",
+    "posix_pthread_wrappers.cc",
+    "posix_pthread_wrappers.h",
     "posix_time_wrappers.cc",
     "posix_time_wrappers.h",
   ]