1 files changed, 273 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/platform/wtf/threading_pthreads.cc b/chromium/third_party/blink/renderer/platform/wtf/threading_pthreads.cc
new file mode 100644
index 00000000000..57e06eddf01
--- /dev/null
+++ b/chromium/third_party/blink/renderer/platform/wtf/threading_pthreads.cc
@@ -0,0 +1,273 @@
+/*
+ * Copyright (C) 2007, 2009 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
+ * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "third_party/blink/renderer/platform/wtf/threading.h"
+
+#include "build/build_config.h"
+
+#if defined(OS_POSIX)
+
+#include <errno.h>
+#include <limits.h>
+#include <sched.h>
+#include <sys/time.h>
+#include "third_party/blink/renderer/platform/wtf/date_math.h"
+#include "third_party/blink/renderer/platform/wtf/dtoa/double-conversion.h"
+#include "third_party/blink/renderer/platform/wtf/hash_map.h"
+#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
+#include "third_party/blink/renderer/platform/wtf/thread_specific.h"
+#include "third_party/blink/renderer/platform/wtf/threading_primitives.h"
+#include "third_party/blink/renderer/platform/wtf/time.h"
+#include "third_party/blink/renderer/platform/wtf/wtf_thread_data.h"
+
+#if defined(OS_MACOSX)
+#include <objc/objc-auto.h>
+#endif
+
+#if defined(OS_LINUX)
+#include <sys/syscall.h>
+#endif
+
+#if defined(OS_LINUX) || defined(OS_ANDROID)
+#include <unistd.h>
+#endif
+
+namespace WTF {
+
+namespace internal {
+
+ThreadIdentifier CurrentThreadSyscall() {
+#if defined(OS_MACOSX)
+  return pthread_mach_thread_np(pthread_self());
+#elif defined(OS_LINUX)
+  return syscall(__NR_gettid);
+#elif defined(OS_ANDROID)
+  return gettid();
+#else
+  return reinterpret_cast<uintptr_t>(pthread_self());
+#endif
+}
+
+}  // namespace internal
+
+void InitializeThreading() {
+  // This should only be called once.
+  WTFThreadData::Initialize();
+
+  InitializeDates();
+  // Force initialization of static DoubleToStringConverter converter variable
+  // inside EcmaScriptConverter function while we are in single thread mode.
+  double_conversion::DoubleToStringConverter::EcmaScriptConverter();
+}
+
+namespace {
+pthread_key_t g_current_thread_key;
+bool g_current_thread_key_initialized = false;
+}  // namespace
+
+void InitializeCurrentThread() {
+  DCHECK(!g_current_thread_key_initialized);
+  int error = pthread_key_create(&g_current_thread_key, nullptr);
+  CHECK(!error);
+  g_current_thread_key_initialized = true;
+}
+
+ThreadIdentifier CurrentThread() {
+  // This doesn't use WTF::ThreadSpecific (e.g. WTFThreadData) because
+  // ThreadSpecific now depends on currentThread. It is necessary to avoid this
+  // or a similar loop:
+  //
+  // currentThread
+  // -> wtfThreadData
+  // -> ThreadSpecific::operator*
+  // -> isMainThread
+  // -> currentThread
+  static_assert(sizeof(ThreadIdentifier) <= sizeof(void*),
+                "ThreadIdentifier must fit in a void*.");
+  DCHECK(g_current_thread_key_initialized);
+  void* value = pthread_getspecific(g_current_thread_key);
+  if (UNLIKELY(!value)) {
+    value = reinterpret_cast<void*>(
+        static_cast<intptr_t>(internal::CurrentThreadSyscall()));
+    DCHECK(value);
+    pthread_setspecific(g_current_thread_key, value);
+  }
+  return reinterpret_cast<intptr_t>(pthread_getspecific(g_current_thread_key));
+}
+
+MutexBase::MutexBase(bool recursive) {
+  pthread_mutexattr_t attr;
+  pthread_mutexattr_init(&attr);
+  pthread_mutexattr_settype(
+      &attr, recursive ? PTHREAD_MUTEX_RECURSIVE : PTHREAD_MUTEX_NORMAL);
+
+  int result = pthread_mutex_init(&mutex_.internal_mutex_, &attr);
+  DCHECK_EQ(result, 0);
+#if DCHECK_IS_ON()
+  mutex_.recursion_count_ = 0;
+#endif
+
+  pthread_mutexattr_destroy(&attr);
+}
+
+MutexBase::~MutexBase() {
+  int result = pthread_mutex_destroy(&mutex_.internal_mutex_);
+  DCHECK_EQ(result, 0);
+}
+
+void MutexBase::lock() {
+  int result = pthread_mutex_lock(&mutex_.internal_mutex_);
+  DCHECK_EQ(result, 0);
+#if DCHECK_IS_ON()
+  ++mutex_.recursion_count_;
+#endif
+}
+
+void MutexBase::unlock() {
+#if DCHECK_IS_ON()
+  DCHECK(mutex_.recursion_count_);
+  --mutex_.recursion_count_;
+#endif
+  int result = pthread_mutex_unlock(&mutex_.internal_mutex_);
+  DCHECK_EQ(result, 0);
+}
+
+// There is a separate tryLock implementation for the Mutex and the
+// RecursiveMutex since on Windows we need to manually check if tryLock should
+// succeed or not for the non-recursive mutex. On Linux the two implementations
+// are equal except we can assert the recursion count is always zero for the
+// non-recursive mutex.
+bool Mutex::TryLock() {
+  int result = pthread_mutex_trylock(&mutex_.internal_mutex_);
+  if (result == 0) {
+#if DCHECK_IS_ON()
+    // The Mutex class is not recursive, so the recursionCount should be
+    // zero after getting the lock.
+    DCHECK(!mutex_.recursion_count_);
+    ++mutex_.recursion_count_;
+#endif
+    return true;
+  }
+  if (result == EBUSY)
+    return false;
+
+  NOTREACHED();
+  return false;
+}
+
+bool RecursiveMutex::TryLock() {
+  int result = pthread_mutex_trylock(&mutex_.internal_mutex_);
+  if (result == 0) {
+#if DCHECK_IS_ON()
+    ++mutex_.recursion_count_;
+#endif
+    return true;
+  }
+  if (result == EBUSY)
+    return false;
+
+  NOTREACHED();
+  return false;
+}
+
+ThreadCondition::ThreadCondition() {
+  pthread_cond_init(&condition_, nullptr);
+}
+
+ThreadCondition::~ThreadCondition() {
+  pthread_cond_destroy(&condition_);
+}
+
+void ThreadCondition::Wait(Mutex& mutex) {
+  PlatformMutex& platform_mutex = mutex.Impl();
+  int result = pthread_cond_wait(&condition_, &platform_mutex.internal_mutex_);
+  DCHECK_EQ(result, 0);
+#if DCHECK_IS_ON()
+  ++platform_mutex.recursion_count_;
+#endif
+}
+
+bool ThreadCondition::TimedWait(Mutex& mutex, double absolute_time) {
+  if (absolute_time < CurrentTime())
+    return false;
+
+  if (absolute_time > INT_MAX) {
+    Wait(mutex);
+    return true;
+  }
+
+  int time_seconds = static_cast<int>(absolute_time);
+  int time_nanoseconds = static_cast<int>((absolute_time - time_seconds) * 1E9);
+
+  timespec target_time;
+  target_time.tv_sec = time_seconds;
+  target_time.tv_nsec = time_nanoseconds;
+
+  PlatformMutex& platform_mutex = mutex.Impl();
+  int result = pthread_cond_timedwait(
+      &condition_, &platform_mutex.internal_mutex_, &target_time);
+#if DCHECK_IS_ON()
+  ++platform_mutex.recursion_count_;
+#endif
+  return result == 0;
+}
+
+void ThreadCondition::Signal() {
+  int result = pthread_cond_signal(&condition_);
+  DCHECK_EQ(result, 0);
+}
+
+void ThreadCondition::Broadcast() {
+  int result = pthread_cond_broadcast(&condition_);
+  DCHECK_EQ(result, 0);
+}
+
+#if DCHECK_IS_ON()
+static bool g_thread_created = false;
+
+Mutex& GetThreadCreatedMutex() {
+  static Mutex g_thread_created_mutex;
+  return g_thread_created_mutex;
+}
+
+bool IsBeforeThreadCreated() {
+  MutexLocker locker(GetThreadCreatedMutex());
+  return !g_thread_created;
+}
+
+void WillCreateThread() {
+  MutexLocker locker(GetThreadCreatedMutex());
+  g_thread_created = true;
+}
+#endif
+
+}  // namespace WTF
+
+#endif  // defined(OS_POSIX)