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Use Windows 10 thread naming API

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While profiling video chat in Chrome I noticed that some of the webrtc
threads were not named. This change adds conditional use of the thread
naming APIs. These thread names work even if you attach a debugger after
the thread is named, and they show up in ETW traces, for easier
profiling.

The sctp_create_thread_adapter threads are still not named but since
those are in C files they would require a C++-with-extern-C interface
to fix, so I'm leaving them for now.

Bug: webrtc:10745
Change-Id: I68f6aa780e2417ce706764d69e5b64cc48aba333
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/175280
Commit-Queue: Tommi <tommi@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31285}
This commit is contained in:
Bruce Dawson
2020-05-16 13:53:59 -07:00
committed by Commit Bot
parent c17587484e
commit e35004dffb
2 changed files with 23 additions and 0 deletions
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1
rtc_base/BUILD.gn
View File

@ -154,6 +154,7 @@ rtc_library("platform_thread_types") {
"platform_thread_types.cc",
"platform_thread_types.h",
]
deps = [ ":macromagic" ]
}
rtc_source_set("refcount") {

22
rtc_base/platform_thread_types.cc
View File

@ -15,6 +15,10 @@
#include <sys/syscall.h>
#endif
#if defined(WEBRTC_WIN)
#include "rtc_base/arraysize.h"
#endif
namespace rtc {
PlatformThreadId CurrentThreadId() {
@ -58,6 +62,24 @@ bool IsThreadRefEqual(const PlatformThreadRef& a, const PlatformThreadRef& b) {
void SetCurrentThreadName(const char* name) {
#if defined(WEBRTC_WIN)
// The SetThreadDescription API works even if no debugger is attached.
// The names set with this API also show up in ETW traces. Very handy.
static auto set_thread_description_func =
reinterpret_cast<decltype(&::SetThreadDescription)>(::GetProcAddress(
::GetModuleHandleA("Kernel32.dll"), "SetThreadDescription"));
if (set_thread_description_func) {
// Convert from ASCII to UTF-16.
wchar_t wide_thread_name[64];
for (size_t i = 0; i < arraysize(wide_thread_name) - 1; ++i) {
wide_thread_name[i] = name[i];
if (wide_thread_name[i] == L'\0')
break;
}
// Guarantee null-termination.
wide_thread_name[arraysize(wide_thread_name) - 1] = L'\0';
set_thread_description_func(::GetCurrentThread(), wide_thread_name);
}
// For details see:
// https://docs.microsoft.com/en-us/visualstudio/debugger/how-to-set-a-thread-name-in-native-code
#pragma pack(push, 8)