1 files changed, 72 insertions, 0 deletions
diff --git a/third_party/libwebrtc/system_wrappers/source/cpu_info.cc b/third_party/libwebrtc/system_wrappers/source/cpu_info.cc
new file mode 100644
index 0000000000..94aed09c48
--- /dev/null
+++ b/third_party/libwebrtc/system_wrappers/source/cpu_info.cc
@@ -0,0 +1,72 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "system_wrappers/include/cpu_info.h"
+
+#if defined(WEBRTC_WIN)
+#include <windows.h>
+#elif defined(WEBRTC_LINUX) || defined(WEBRTC_BSD)
+#include <unistd.h>
+#elif defined(WEBRTC_MAC)
+#include <sys/sysctl.h>
+#elif defined(WEBRTC_FUCHSIA)
+#include <zircon/syscalls.h>
+#endif
+
+#include "rtc_base/logging.h"
+
+namespace internal {
+static int DetectNumberOfCores() {
+  int number_of_cores;
+
+#if defined(WEBRTC_WIN)
+  SYSTEM_INFO si;
+  GetNativeSystemInfo(&si);
+  number_of_cores = static_cast<int>(si.dwNumberOfProcessors);
+#elif defined(WEBRTC_LINUX) || defined(WEBRTC_ANDROID) || defined(WEBRTC_BSD)
+  number_of_cores = static_cast<int>(sysconf(_SC_NPROCESSORS_ONLN));
+  if (number_of_cores <= 0) {
+    RTC_LOG(LS_ERROR) << "Failed to get number of cores";
+    number_of_cores = 1;
+  }
+#elif defined(WEBRTC_MAC) || defined(WEBRTC_IOS)
+  int name[] = {CTL_HW, HW_AVAILCPU};
+  size_t size = sizeof(number_of_cores);
+  if (0 != sysctl(name, 2, &number_of_cores, &size, NULL, 0)) {
+    RTC_LOG(LS_ERROR) << "Failed to get number of cores";
+    number_of_cores = 1;
+  }
+#elif defined(WEBRTC_FUCHSIA)
+  number_of_cores = zx_system_get_num_cpus();
+#else
+  RTC_LOG(LS_ERROR) << "No function to get number of cores";
+  number_of_cores = 1;
+#endif
+
+  RTC_LOG(LS_INFO) << "Available number of cores: " << number_of_cores;
+
+  RTC_CHECK_GT(number_of_cores, 0);
+  return number_of_cores;
+}
+}  // namespace internal
+
+namespace webrtc {
+
+uint32_t CpuInfo::DetectNumberOfCores() {
+  // Statically cache the number of system cores available since if the process
+  // is running in a sandbox, we may only be able to read the value once (before
+  // the sandbox is initialized) and not thereafter.
+  // For more information see crbug.com/176522.
+  static const uint32_t logical_cpus =
+      static_cast<uint32_t>(internal::DetectNumberOfCores());
+  return logical_cpus;
+}
+
+}  // namespace webrtc