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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2011 New Dream Network
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include <signal.h>
#include <unistd.h>
#ifdef __linux__
#include <sys/syscall.h> /* For SYS_xxx definitions */
#endif
#include "common/Thread.h"
#include "common/code_environment.h"
#include "common/debug.h"
#include "common/signal.h"
#ifdef HAVE_SCHED
#include <sched.h>
#endif
pid_t ceph_gettid(void)
{
#ifdef __linux__
return syscall(SYS_gettid);
#else
return -ENOSYS;
#endif
}
static int _set_affinity(int id)
{
#ifdef HAVE_SCHED
if (id >= 0 && id < CPU_SETSIZE) {
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
CPU_SET(id, &cpuset);
if (sched_setaffinity(0, sizeof(cpuset), &cpuset) < 0)
return -errno;
/* guaranteed to take effect immediately */
sched_yield();
}
#endif
return 0;
}
Thread::Thread()
: thread_id(0),
pid(0),
cpuid(-1),
thread_name(NULL)
{
}
Thread::~Thread()
{
}
void *Thread::_entry_func(void *arg) {
void *r = ((Thread*)arg)->entry_wrapper();
return r;
}
void *Thread::entry_wrapper()
{
int p = ceph_gettid(); // may return -ENOSYS on other platforms
if (p > 0)
pid = p;
if (pid && cpuid >= 0)
_set_affinity(cpuid);
ceph_pthread_setname(pthread_self(), thread_name);
return entry();
}
const pthread_t &Thread::get_thread_id() const
{
return thread_id;
}
bool Thread::is_started() const
{
return thread_id != 0;
}
bool Thread::am_self() const
{
return (pthread_self() == thread_id);
}
int Thread::kill(int signal)
{
if (thread_id)
return pthread_kill(thread_id, signal);
else
return -EINVAL;
}
int Thread::try_create(size_t stacksize)
{
pthread_attr_t *thread_attr = NULL;
pthread_attr_t thread_attr_loc;
stacksize &= CEPH_PAGE_MASK; // must be multiple of page
if (stacksize) {
thread_attr = &thread_attr_loc;
pthread_attr_init(thread_attr);
pthread_attr_setstacksize(thread_attr, stacksize);
}
int r;
// The child thread will inherit our signal mask. Set our signal mask to
// the set of signals we want to block. (It's ok to block signals more
// signals than usual for a little while-- they will just be delivered to
// another thread or delieverd to this thread later.)
sigset_t old_sigset;
if (g_code_env == CODE_ENVIRONMENT_LIBRARY) {
block_signals(NULL, &old_sigset);
}
else {
int to_block[] = { SIGPIPE , 0 };
block_signals(to_block, &old_sigset);
}
r = pthread_create(&thread_id, thread_attr, _entry_func, (void*)this);
restore_sigset(&old_sigset);
if (thread_attr) {
pthread_attr_destroy(thread_attr);
}
return r;
}
void Thread::create(const char *name, size_t stacksize)
{
ceph_assert(strlen(name) < 16);
thread_name = name;
int ret = try_create(stacksize);
if (ret != 0) {
char buf[256];
snprintf(buf, sizeof(buf), "Thread::try_create(): pthread_create "
"failed with error %d", ret);
dout_emergency(buf);
ceph_assert(ret == 0);
}
}
int Thread::join(void **prval)
{
if (thread_id == 0) {
ceph_abort_msg("join on thread that was never started");
return -EINVAL;
}
int status = pthread_join(thread_id, prval);
if (status != 0) {
char buf[256];
snprintf(buf, sizeof(buf), "Thread::join(): pthread_join "
"failed with error %d\n", status);
dout_emergency(buf);
ceph_assert(status == 0);
}
thread_id = 0;
return status;
}
int Thread::detach()
{
return pthread_detach(thread_id);
}
int Thread::set_affinity(int id)
{
int r = 0;
cpuid = id;
if (pid && ceph_gettid() == pid)
r = _set_affinity(id);
return r;
}
// Functions for std::thread
// =========================
void set_thread_name(std::thread& t, const std::string& s) {
int r = ceph_pthread_setname(t.native_handle(), s.c_str());
if (r != 0) {
throw std::system_error(r, std::generic_category());
}
}
std::string get_thread_name(const std::thread& t) {
std::string s(256, '\0');
int r = ceph_pthread_getname(const_cast<std::thread&>(t).native_handle(),
s.data(), s.length());
if (r != 0) {
throw std::system_error(r, std::generic_category());
}
s.resize(std::strlen(s.data()));
return s;
}
void kill(std::thread& t, int signal)
{
auto r = pthread_kill(t.native_handle(), signal);
if (r != 0) {
throw std::system_error(r, std::generic_category());
}
}
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