1 /*
2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "cpu_info.h"
12
13 #if defined(_WIN32)
14 #include <Windows.h>
15 #elif defined(WEBRTC_MAC)
16 #include <sys/types.h>
17 #include <sys/sysctl.h>
18 #elif defined(WEBRTC_MAC_INTEL)
19 // Intentionally empty
20 #elif defined(WEBRTC_ANDROID)
21 // Not implemented yet, might be possible to use Linux implementation
22 #else // defined(WEBRTC_LINUX)
23 #include <sys/sysinfo.h>
24 #endif
25
26 #include "trace.h"
27
28 namespace webrtc {
29
30 WebRtc_UWord32 CpuInfo::_numberOfCores = 0;
31
DetectNumberOfCores()32 WebRtc_UWord32 CpuInfo::DetectNumberOfCores()
33 {
34 if (!_numberOfCores)
35 {
36 #if defined(_WIN32)
37 SYSTEM_INFO si;
38 GetSystemInfo(&si);
39 _numberOfCores = static_cast<WebRtc_UWord32>(si.dwNumberOfProcessors);
40 WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
41 "Available number of cores:%d", _numberOfCores);
42
43 #elif defined(WEBRTC_LINUX) && !defined(WEBRTC_ANDROID)
44 _numberOfCores = get_nprocs();
45 WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
46 "Available number of cores:%d", _numberOfCores);
47
48 #elif (defined(WEBRTC_MAC) || defined(WEBRTC_MAC_INTEL))
49 int name[] = {CTL_HW, HW_AVAILCPU};
50 int ncpu;
51 size_t size = sizeof(ncpu);
52 if(0 == sysctl(name, 2, &ncpu, &size, NULL, 0))
53 {
54 _numberOfCores = static_cast<WebRtc_UWord32>(ncpu);
55 WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1,
56 "Available number of cores:%d", _numberOfCores);
57 } else
58 {
59 WEBRTC_TRACE(kTraceError, kTraceUtility, -1,
60 "Failed to get number of cores");
61 _numberOfCores = 1;
62 }
63 #else
64 WEBRTC_TRACE(kTraceWarning, kTraceUtility, -1,
65 "No function to get number of cores");
66 _numberOfCores = 1;
67 #endif
68 }
69 return _numberOfCores;
70 }
71
72 } // namespace webrtc
73