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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2025
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/port/detail/ThreadPthread.h"
char disable_linker_warning_about_empty_file_thread_pthread_cpp TD_UNUSED;
#if TD_THREAD_PTHREAD
#include "td/utils/misc.h"
#include "td/utils/port/detail/skip_eintr.h"
#if TD_NETBSD
#include "td/utils/ScopeGuard.h"
#endif
#include <pthread.h>
#if TD_FREEBSD
#include <pthread_np.h>
#endif
#include <sched.h>
#include <signal.h>
#if TD_FREEBSD
#include <sys/cpuset.h>
#endif
#if TD_FREEBSD || TD_OPENBSD || TD_NETBSD
#include <sys/sysctl.h>
#endif
#include <unistd.h>
namespace td {
namespace detail {
unsigned ThreadPthread::hardware_concurrency() {
// Linux and macOS
#if defined(_SC_NPROCESSORS_ONLN)
{
auto res = sysconf(_SC_NPROCESSORS_ONLN);
if (res > 0) {
return narrow_cast<unsigned>(res);
}
}
#endif
#if TD_FREEBSD || TD_OPENBSD || TD_NETBSD
#if defined(HW_AVAILCPU) && defined(CTL_HW)
{
int mib[2] = {CTL_HW, HW_AVAILCPU};
int res{0};
size_t len = sizeof(res);
if (sysctl(mib, 2, &res, &len, nullptr, 0) == 0 && res != 0) {
return res;
}
}
#endif
#if defined(HW_NCPU) && defined(CTL_HW)
{
int mib[2] = {CTL_HW, HW_NCPU};
int res{0};
size_t len = sizeof(res);
if (sysctl(mib, 2, &res, &len, nullptr, 0) == 0 && res != 0) {
return res;
}
}
#endif
#endif
// Just in case
return 8;
}
void ThreadPthread::set_name(CSlice name) {
#if defined(_GNU_SOURCE) && defined(__GLIBC_PREREQ)
#if __GLIBC_PREREQ(2, 12)
pthread_setname_np(thread_, name.c_str());
#endif
#endif
}
void ThreadPthread::join() {
if (is_inited_.get()) {
is_inited_ = false;
pthread_join(thread_, nullptr);
}
}
void ThreadPthread::detach() {
if (is_inited_.get()) {
is_inited_ = false;
pthread_detach(thread_);
}
}
void ThreadPthread::send_real_time_signal(id thread_id, int real_time_signal_number) {
#ifdef SIGRTMIN
pthread_kill(thread_id, SIGRTMIN + real_time_signal_number);
#endif
}
int ThreadPthread::do_pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void *),
void *arg) {
return pthread_create(thread, attr, start_routine, arg);
}
#if TD_HAVE_THREAD_AFFINITY
Status ThreadPthread::set_affinity_mask(id thread_id, uint64 mask) {
#if TD_LINUX || TD_FREEBSD
#if TD_FREEBSD
cpuset_t cpuset;
#else
cpu_set_t cpuset;
#endif
CPU_ZERO(&cpuset);
for (int j = 0; j < 64 && j < CPU_SETSIZE; j++) {
if ((mask >> j) & 1) {
CPU_SET(j, &cpuset);
}
}
auto res = skip_eintr([&] { return pthread_setaffinity_np(thread_id, sizeof(cpuset), &cpuset); });
if (res) {
return OS_ERROR("Failed to set thread affinity mask");
}
return Status::OK();
#elif TD_NETBSD
cpuset_t *cpuset = cpuset_create();
if (cpuset == nullptr) {
return OS_ERROR("Failed to create cpuset");
}
SCOPE_EXIT {
cpuset_destroy(cpuset);
};
for (int j = 0; j < 64; j++) {
if ((mask >> j) & 1) {
if (cpuset_set(j, cpuset) != 0) {
return OS_ERROR("Failed to set CPU identifier");
}
}
}
auto res = skip_eintr([&] { return pthread_setaffinity_np(thread_id, cpuset_size(cpuset), cpuset); });
if (res) {
return OS_ERROR("Failed to set thread affinity mask");
}
if (get_affinity_mask(thread_id) != mask) {
return Status::Error("Failed to set exact thread affinity mask");
}
return Status::OK();
#else
return Status::Error("Unsupported");
#endif
}
uint64 ThreadPthread::get_affinity_mask(id thread_id) {
#if TD_LINUX || TD_FREEBSD
#if TD_FREEBSD
cpuset_t cpuset;
#else
cpu_set_t cpuset;
#endif
CPU_ZERO(&cpuset);
auto res = skip_eintr([&] { return pthread_getaffinity_np(thread_id, sizeof(cpuset), &cpuset); });
if (res) {
return 0;
}
uint64 mask = 0;
for (int j = 0; j < 64 && j < CPU_SETSIZE; j++) {
if (CPU_ISSET(j, &cpuset)) {
mask |= static_cast<uint64>(1) << j;
}
}
return mask;
#elif TD_NETBSD
cpuset_t *cpuset = cpuset_create();
if (cpuset == nullptr) {
return 0;
}
SCOPE_EXIT {
cpuset_destroy(cpuset);
};
auto res = skip_eintr([&] { return pthread_getaffinity_np(thread_id, cpuset_size(cpuset), cpuset); });
if (res) {
return 0;
}
uint64 mask = 0;
for (int j = 0; j < 64; j++) {
if (cpuset_isset(j, cpuset) > 0) {
mask |= static_cast<uint64>(1) << j;
}
}
if (mask == 0) {
// the mask wasn't set, all CPUs are allowed
auto proc_count = sysconf(_SC_NPROCESSORS_ONLN);
for (int j = 0; j < 64 && j < proc_count; j++) {
mask |= static_cast<uint64>(1) << j;
}
}
return mask;
#else
return 0;
#endif
}
#endif
namespace this_thread_pthread {
ThreadPthread::id get_id() {
return pthread_self();
}
} // namespace this_thread_pthread
} // namespace detail
} // namespace td
#endif
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