Fix thread naming on Linux, which limits names to 15 bytes.

- In `SetCurrentThreadName`, when on Linux, truncate to 15 bytes, as (at
  least on glibc) `pthread_set_name_np` will otherwise return `ERANGE` and
  do nothing.
- Also, add logging in case `pthread_set_name_np` returns an error
  anyway.  This is Linux-specific, as the Apple and BSD versions of
  `pthread_set_name_np return `void`.
- Change the name for CPU threads in multi-core mode from
  "yuzu:CoreCPUThread_N" (19 bytes) to "yuzu:CPUCore_N" (14 bytes) so it
  fits into the Linux limit.  Some other thread names are also cut off,
  but I didn't bother addressing them as you can guess them from the
  truncated versions.  For a CPU thread, truncation means you can't see
  which core it is!
This commit is contained in:
comex 2020-08-02 10:57:08 -07:00 committed by FearlessTobi
parent 6a77547bde
commit 2ba35cab73

View file

@ -2,6 +2,8 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/common_funcs.h"
#include "common/logging/log.h"
#include "common/thread.h"
#ifdef __APPLE__
#include <mach/mach.h>
@ -18,6 +20,7 @@
#ifndef _WIN32
#include <unistd.h>
#endif
#include <string>
#ifdef __FreeBSD__
#define cpu_set_t cpuset_t
@ -64,6 +67,14 @@ void SetCurrentThreadName(const char* name) {
pthread_set_name_np(pthread_self(), name);
#elif defined(__NetBSD__)
pthread_setname_np(pthread_self(), "%s", (void*)name);
#elif defined(__linux__)
// Linux limits thread names to 15 characters and will outright reject any
// attempt to set a longer name with ERANGE.
std::string truncated(name, std::min(strlen(name), static_cast<size_t>(15)));
if (int e = pthread_setname_np(pthread_self(), truncated.c_str())) {
errno = e;
LOG_ERROR(Common, "Failed to set thread name to '{}': {}", truncated, GetLastErrorMsg());
}
#else
pthread_setname_np(pthread_self(), name);
#endif