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// Copyright (c) 2018-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <bitcoin-build-config.h> // IWYU pragma: keep
#include <cstring>
#include <string>
#include <thread>
#include <utility>
#if (defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__))
#include <pthread.h>
#include <pthread_np.h>
#endif
#include <util/threadnames.h>
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
//! Set the thread's name at the process level. Does not affect the
//! internal name.
static void SetThreadName(const char* name)
{
#if defined(PR_SET_NAME)
// Only the first 15 characters are used (16 - NUL terminator)
::prctl(PR_SET_NAME, name, 0, 0, 0);
#elif (defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__))
pthread_set_name_np(pthread_self(), name);
#elif defined(MAC_OSX)
pthread_setname_np(name);
#else
// Prevent warnings for unused parameters...
(void)name;
#endif
}
/**
* The name of the thread. We use char array instead of std::string to avoid
* complications with running a destructor when the thread exits. Avoid adding
* other thread_local variables.
* @see https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278701
*/
static thread_local char g_thread_name[128]{'\0'};
std::string util::ThreadGetInternalName() { return g_thread_name; }
//! Set the in-memory internal name for this thread. Does not affect the process
//! name.
static void SetInternalName(const std::string& name)
{
const size_t copy_bytes{std::min(sizeof(g_thread_name) - 1, name.length())};
std::memcpy(g_thread_name, name.data(), copy_bytes);
g_thread_name[copy_bytes] = '\0';
}
void util::ThreadRename(const std::string& name)
{
SetThreadName(("b-" + name).c_str());
SetInternalName(name);
}
void util::ThreadSetInternalName(const std::string& name)
{
SetInternalName(name);
}
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