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846 lines (758 loc) · 26.7 KB
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// Copyright (C) 2001-2003
// William E. Kempf
// Copyright (C) 2007-8 Anthony Williams
// (C) Copyright 2011-2012 Vicente J. Botet Escriba
//
// 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 <boost/thread/detail/config.hpp>
#include <boost/thread/thread_only.hpp>
#if defined BOOST_THREAD_USES_DATETIME
#include <boost/thread/xtime.hpp>
#endif
#include <boost/thread/condition_variable.hpp>
#include <boost/thread/locks.hpp>
#include <boost/thread/once.hpp>
#include <boost/thread/tss.hpp>
#include <boost/thread/future.hpp>
#ifdef __GLIBC__
#include <sys/sysinfo.h>
#elif defined(__APPLE__) || defined(__FreeBSD__)
#include <sys/types.h>
#include <sys/sysctl.h>
#elif defined BOOST_HAS_UNISTD_H
#include <unistd.h>
#endif
#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/trim.hpp>
#include <boost/lexical_cast.hpp>
#include <fstream>
#include <string>
#include <set>
#include <vector>
#include <string.h> // memcmp.
namespace boost
{
namespace detail
{
thread_data_base::~thread_data_base()
{
for (notify_list_t::iterator i = notify.begin(), e = notify.end();
i != e; ++i)
{
i->second->unlock();
i->first->notify_all();
}
for (async_states_t::iterator i = async_states_.begin(), e = async_states_.end();
i != e; ++i)
{
(*i)->make_ready();
}
}
struct thread_exit_callback_node
{
boost::detail::thread_exit_function_base* func;
thread_exit_callback_node* next;
thread_exit_callback_node(boost::detail::thread_exit_function_base* func_,
thread_exit_callback_node* next_):
func(func_),next(next_)
{}
};
namespace
{
#ifdef BOOST_THREAD_PROVIDES_ONCE_CXX11
boost::once_flag current_thread_tls_init_flag;
#else
boost::once_flag current_thread_tls_init_flag=BOOST_ONCE_INIT;
#endif
pthread_key_t current_thread_tls_key;
extern "C"
{
static void tls_destructor(void* data)
{
//boost::detail::thread_data_base* thread_info=static_cast<boost::detail::thread_data_base*>(data);
boost::detail::thread_data_ptr thread_info = static_cast<boost::detail::thread_data_base*>(data)->shared_from_this();
if(thread_info)
{
while(!thread_info->tss_data.empty() || thread_info->thread_exit_callbacks)
{
while(thread_info->thread_exit_callbacks)
{
detail::thread_exit_callback_node* const current_node=thread_info->thread_exit_callbacks;
thread_info->thread_exit_callbacks=current_node->next;
if(current_node->func)
{
(*current_node->func)();
delete current_node->func;
}
delete current_node;
}
while (!thread_info->tss_data.empty())
{
std::map<void const*,detail::tss_data_node>::iterator current
= thread_info->tss_data.begin();
if(current->second.func && (current->second.value!=0))
{
(*current->second.func)(current->second.value);
}
thread_info->tss_data.erase(current);
}
}
thread_info->self.reset();
}
}
}
#if defined BOOST_THREAD_PATCH
struct delete_current_thread_tls_key_on_dlclose_t
{
delete_current_thread_tls_key_on_dlclose_t()
{
}
~delete_current_thread_tls_key_on_dlclose_t()
{
const boost::once_flag uninitialized = BOOST_ONCE_INIT;
if (memcmp(¤t_thread_tls_init_flag, &uninitialized, sizeof(boost::once_flag)))
{
void* data = pthread_getspecific(current_thread_tls_key);
if (data)
tls_destructor(data);
pthread_key_delete(current_thread_tls_key);
}
}
};
delete_current_thread_tls_key_on_dlclose_t delete_current_thread_tls_key_on_dlclose;
#endif
void create_current_thread_tls_key()
{
BOOST_VERIFY(!pthread_key_create(¤t_thread_tls_key,&tls_destructor));
}
}
boost::detail::thread_data_base* get_current_thread_data()
{
boost::call_once(current_thread_tls_init_flag,create_current_thread_tls_key);
return (boost::detail::thread_data_base*)pthread_getspecific(current_thread_tls_key);
}
void set_current_thread_data(detail::thread_data_base* new_data)
{
boost::call_once(current_thread_tls_init_flag,create_current_thread_tls_key);
BOOST_VERIFY(!pthread_setspecific(current_thread_tls_key,new_data));
}
}
namespace
{
extern "C"
{
static void* thread_proxy(void* param)
{
//boost::detail::thread_data_ptr thread_info = static_cast<boost::detail::thread_data_base*>(param)->self;
boost::detail::thread_data_ptr thread_info = static_cast<boost::detail::thread_data_base*>(param)->shared_from_this();
thread_info->self.reset();
detail::set_current_thread_data(thread_info.get());
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
BOOST_TRY
{
#endif
thread_info->run();
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
}
BOOST_CATCH (thread_interrupted const&)
{
}
// Removed as it stops the debugger identifying the cause of the exception
// Unhandled exceptions still cause the application to terminate
// BOOST_CATCH(...)
// {
// throw;
//
// std::terminate();
// }
BOOST_CATCH_END
#endif
detail::tls_destructor(thread_info.get());
detail::set_current_thread_data(0);
boost::lock_guard<boost::mutex> lock(thread_info->data_mutex);
thread_info->done=true;
thread_info->done_condition.notify_all();
return 0;
}
}
}
namespace detail
{
struct externally_launched_thread:
detail::thread_data_base
{
externally_launched_thread()
{
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
interrupt_enabled=false;
#endif
}
~externally_launched_thread() {
BOOST_ASSERT(notify.empty());
notify.clear();
BOOST_ASSERT(async_states_.empty());
async_states_.clear();
}
void run()
{}
void notify_all_at_thread_exit(condition_variable*, mutex*)
{}
private:
externally_launched_thread(externally_launched_thread&);
void operator=(externally_launched_thread&);
};
thread_data_base* make_external_thread_data()
{
thread_data_base* const me(detail::heap_new<externally_launched_thread>());
me->self.reset(me);
set_current_thread_data(me);
return me;
}
thread_data_base* get_or_make_current_thread_data()
{
thread_data_base* current_thread_data(get_current_thread_data());
if(!current_thread_data)
{
current_thread_data=make_external_thread_data();
}
return current_thread_data;
}
}
thread::thread() BOOST_NOEXCEPT
{}
bool thread::start_thread_noexcept()
{
thread_info->self=thread_info;
int const res = pthread_create(&thread_info->thread_handle, 0, &thread_proxy, thread_info.get());
if (res != 0)
{
thread_info->self.reset();
return false;
}
return true;
}
bool thread::start_thread_noexcept(const attributes& attr)
{
thread_info->self=thread_info;
const attributes::native_handle_type* h = attr.native_handle();
int res = pthread_create(&thread_info->thread_handle, h, &thread_proxy, thread_info.get());
if (res != 0)
{
thread_info->self.reset();
return false;
}
int detached_state;
res = pthread_attr_getdetachstate(h, &detached_state);
if (res != 0)
{
thread_info->self.reset();
return false;
}
if (PTHREAD_CREATE_DETACHED==detached_state)
{
detail::thread_data_ptr local_thread_info;
thread_info.swap(local_thread_info);
if(local_thread_info)
{
//lock_guard<mutex> lock(local_thread_info->data_mutex);
if(!local_thread_info->join_started)
{
//BOOST_VERIFY(!pthread_detach(local_thread_info->thread_handle));
local_thread_info->join_started=true;
local_thread_info->joined=true;
}
}
}
return true;
}
detail::thread_data_ptr thread::get_thread_info BOOST_PREVENT_MACRO_SUBSTITUTION () const
{
return thread_info;
}
bool thread::join_noexcept()
{
detail::thread_data_ptr const local_thread_info=(get_thread_info)();
if(local_thread_info)
{
bool do_join=false;
{
unique_lock<mutex> lock(local_thread_info->data_mutex);
while(!local_thread_info->done)
{
local_thread_info->done_condition.wait(lock);
}
do_join=!local_thread_info->join_started;
if(do_join)
{
local_thread_info->join_started=true;
}
else
{
while(!local_thread_info->joined)
{
local_thread_info->done_condition.wait(lock);
}
}
}
if(do_join)
{
void* result=0;
BOOST_VERIFY(!pthread_join(local_thread_info->thread_handle,&result));
lock_guard<mutex> lock(local_thread_info->data_mutex);
local_thread_info->joined=true;
local_thread_info->done_condition.notify_all();
}
if(thread_info==local_thread_info)
{
thread_info.reset();
}
return true;
}
else
{
return false;
}
}
bool thread::do_try_join_until_noexcept(struct timespec const &timeout, bool& res)
{
detail::thread_data_ptr const local_thread_info=(get_thread_info)();
if(local_thread_info)
{
bool do_join=false;
{
unique_lock<mutex> lock(local_thread_info->data_mutex);
while(!local_thread_info->done)
{
if(!local_thread_info->done_condition.do_wait_until(lock,timeout))
{
res=false;
return true;
}
}
do_join=!local_thread_info->join_started;
if(do_join)
{
local_thread_info->join_started=true;
}
else
{
while(!local_thread_info->joined)
{
local_thread_info->done_condition.wait(lock);
}
}
}
if(do_join)
{
void* result=0;
BOOST_VERIFY(!pthread_join(local_thread_info->thread_handle,&result));
lock_guard<mutex> lock(local_thread_info->data_mutex);
local_thread_info->joined=true;
local_thread_info->done_condition.notify_all();
}
if(thread_info==local_thread_info)
{
thread_info.reset();
}
res=true;
return true;
}
else
{
return false;
}
}
bool thread::joinable() const BOOST_NOEXCEPT
{
return (get_thread_info)()?true:false;
}
void thread::detach()
{
detail::thread_data_ptr local_thread_info;
thread_info.swap(local_thread_info);
if(local_thread_info)
{
lock_guard<mutex> lock(local_thread_info->data_mutex);
if(!local_thread_info->join_started)
{
BOOST_VERIFY(!pthread_detach(local_thread_info->thread_handle));
local_thread_info->join_started=true;
local_thread_info->joined=true;
}
}
}
namespace this_thread
{
namespace no_interruption_point
{
namespace hidden
{
void BOOST_THREAD_DECL sleep_for(const timespec& ts)
{
if (boost::detail::timespec_ge(ts, boost::detail::timespec_zero()))
{
# if defined(BOOST_HAS_PTHREAD_DELAY_NP)
# if defined(__IBMCPP__) || defined(_AIX)
BOOST_VERIFY(!pthread_delay_np(const_cast<timespec*>(&ts)));
# else
BOOST_VERIFY(!pthread_delay_np(&ts));
# endif
# elif defined(BOOST_HAS_NANOSLEEP)
// nanosleep takes a timespec that is an offset, not
// an absolute time.
nanosleep(&ts, 0);
# else
mutex mx;
unique_lock<mutex> lock(mx);
condition_variable cond;
cond.do_wait_for(lock, ts);
# endif
}
}
void BOOST_THREAD_DECL sleep_until(const timespec& ts)
{
timespec now = boost::detail::timespec_now();
if (boost::detail::timespec_gt(ts, now))
{
for (int foo=0; foo < 5; ++foo)
{
# if defined(BOOST_HAS_PTHREAD_DELAY_NP)
timespec d = boost::detail::timespec_minus(ts, now);
BOOST_VERIFY(!pthread_delay_np(&d));
# elif defined(BOOST_HAS_NANOSLEEP)
// nanosleep takes a timespec that is an offset, not
// an absolute time.
timespec d = boost::detail::timespec_minus(ts, now);
nanosleep(&d, 0);
# else
mutex mx;
unique_lock<mutex> lock(mx);
condition_variable cond;
cond.do_wait_until(lock, ts);
# endif
timespec now2 = boost::detail::timespec_now();
if (boost::detail::timespec_ge(now2, ts))
{
return;
}
}
}
}
}
}
namespace hidden
{
void BOOST_THREAD_DECL sleep_for(const timespec& ts)
{
boost::detail::thread_data_base* const thread_info=boost::detail::get_current_thread_data();
if(thread_info)
{
unique_lock<mutex> lk(thread_info->sleep_mutex);
while( thread_info->sleep_condition.do_wait_for(lk,ts)) {}
}
else
{
boost::this_thread::no_interruption_point::hidden::sleep_for(ts);
}
}
void BOOST_THREAD_DECL sleep_until(const timespec& ts)
{
boost::detail::thread_data_base* const thread_info=boost::detail::get_current_thread_data();
if(thread_info)
{
unique_lock<mutex> lk(thread_info->sleep_mutex);
while(thread_info->sleep_condition.do_wait_until(lk,ts)) {}
}
else
{
boost::this_thread::no_interruption_point::hidden::sleep_until(ts);
}
}
} // hidden
} // this_thread
namespace this_thread
{
void yield() BOOST_NOEXCEPT
{
# if defined(BOOST_HAS_SCHED_YIELD)
BOOST_VERIFY(!sched_yield());
# elif defined(BOOST_HAS_PTHREAD_YIELD)
BOOST_VERIFY(!pthread_yield());
//# elif defined BOOST_THREAD_USES_DATETIME
// xtime xt;
// xtime_get(&xt, TIME_UTC_);
// sleep(xt);
// sleep_for(chrono::milliseconds(0));
# else
#error
timespec ts;
ts.tv_sec= 0;
ts.tv_nsec= 0;
hidden::sleep_for(ts);
# endif
}
}
unsigned thread::hardware_concurrency() BOOST_NOEXCEPT
{
#if defined(PTW32_VERSION) || defined(__hpux)
return pthread_num_processors_np();
#elif defined(__APPLE__) || defined(__FreeBSD__)
int count;
size_t size=sizeof(count);
return sysctlbyname("hw.ncpu",&count,&size,NULL,0)?0:count;
#elif defined(BOOST_HAS_UNISTD_H) && defined(_SC_NPROCESSORS_ONLN)
int const count=sysconf(_SC_NPROCESSORS_ONLN);
return (count>0)?count:0;
#elif defined(__GLIBC__)
return get_nprocs();
#else
return 0;
#endif
}
unsigned thread::physical_concurrency() BOOST_NOEXCEPT
{
#ifdef __linux__
try {
using namespace std;
ifstream proc_cpuinfo ("/proc/cpuinfo");
const string physical_id("physical id"), core_id("core id");
typedef std::pair<unsigned, unsigned> core_entry; // [physical ID, core id]
std::set<core_entry> cores;
core_entry current_core_entry;
string line;
while ( getline(proc_cpuinfo, line) ) {
if (line.empty())
continue;
vector<string> key_val(2);
boost::split(key_val, line, boost::is_any_of(":"));
if (key_val.size() != 2)
return hardware_concurrency();
string key = key_val[0];
string value = key_val[1];
boost::trim(key);
boost::trim(value);
if (key == physical_id) {
current_core_entry.first = boost::lexical_cast<unsigned>(value);
continue;
}
if (key == core_id) {
current_core_entry.second = boost::lexical_cast<unsigned>(value);
cores.insert(current_core_entry);
continue;
}
}
// Fall back to hardware_concurrency() in case
// /proc/cpuinfo is formatted differently than we expect.
return cores.size() != 0 ? cores.size() : hardware_concurrency();
} catch(...) {
return hardware_concurrency();
}
#elif defined(__APPLE__)
int count;
size_t size=sizeof(count);
return sysctlbyname("hw.physicalcpu",&count,&size,NULL,0)?0:count;
#else
return hardware_concurrency();
#endif
}
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
void thread::interrupt()
{
detail::thread_data_ptr const local_thread_info=(get_thread_info)();
if(local_thread_info)
{
lock_guard<mutex> lk(local_thread_info->data_mutex);
local_thread_info->interrupt_requested=true;
if(local_thread_info->current_cond)
{
boost::pthread::pthread_mutex_scoped_lock internal_lock(local_thread_info->cond_mutex);
BOOST_VERIFY(!pthread_cond_broadcast(local_thread_info->current_cond));
}
}
}
bool thread::interruption_requested() const BOOST_NOEXCEPT
{
detail::thread_data_ptr const local_thread_info=(get_thread_info)();
if(local_thread_info)
{
lock_guard<mutex> lk(local_thread_info->data_mutex);
return local_thread_info->interrupt_requested;
}
else
{
return false;
}
}
#endif
thread::native_handle_type thread::native_handle()
{
detail::thread_data_ptr const local_thread_info=(get_thread_info)();
if(local_thread_info)
{
lock_guard<mutex> lk(local_thread_info->data_mutex);
return local_thread_info->thread_handle;
}
else
{
return pthread_t();
}
}
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
namespace this_thread
{
void interruption_point()
{
#ifndef BOOST_NO_EXCEPTIONS
boost::detail::thread_data_base* const thread_info=detail::get_current_thread_data();
if(thread_info && thread_info->interrupt_enabled)
{
lock_guard<mutex> lg(thread_info->data_mutex);
if(thread_info->interrupt_requested)
{
thread_info->interrupt_requested=false;
throw thread_interrupted();
}
}
#endif
}
bool interruption_enabled() BOOST_NOEXCEPT
{
boost::detail::thread_data_base* const thread_info=detail::get_current_thread_data();
return thread_info && thread_info->interrupt_enabled;
}
bool interruption_requested() BOOST_NOEXCEPT
{
boost::detail::thread_data_base* const thread_info=detail::get_current_thread_data();
if(!thread_info)
{
return false;
}
else
{
lock_guard<mutex> lg(thread_info->data_mutex);
return thread_info->interrupt_requested;
}
}
disable_interruption::disable_interruption() BOOST_NOEXCEPT:
interruption_was_enabled(interruption_enabled())
{
if(interruption_was_enabled)
{
detail::get_current_thread_data()->interrupt_enabled=false;
}
}
disable_interruption::~disable_interruption() BOOST_NOEXCEPT
{
if(detail::get_current_thread_data())
{
detail::get_current_thread_data()->interrupt_enabled=interruption_was_enabled;
}
}
restore_interruption::restore_interruption(disable_interruption& d) BOOST_NOEXCEPT
{
if(d.interruption_was_enabled)
{
detail::get_current_thread_data()->interrupt_enabled=true;
}
}
restore_interruption::~restore_interruption() BOOST_NOEXCEPT
{
if(detail::get_current_thread_data())
{
detail::get_current_thread_data()->interrupt_enabled=false;
}
}
}
#endif
namespace detail
{
void add_thread_exit_function(thread_exit_function_base* func)
{
detail::thread_data_base* const current_thread_data(get_or_make_current_thread_data());
thread_exit_callback_node* const new_node=
heap_new<thread_exit_callback_node>(func,current_thread_data->thread_exit_callbacks);
current_thread_data->thread_exit_callbacks=new_node;
}
tss_data_node* find_tss_data(void const* key)
{
detail::thread_data_base* const current_thread_data(get_current_thread_data());
if(current_thread_data)
{
std::map<void const*,tss_data_node>::iterator current_node=
current_thread_data->tss_data.find(key);
if(current_node!=current_thread_data->tss_data.end())
{
return ¤t_node->second;
}
}
return 0;
}
void* get_tss_data(void const* key)
{
if(tss_data_node* const current_node=find_tss_data(key))
{
return current_node->value;
}
return 0;
}
void add_new_tss_node(void const* key,
boost::shared_ptr<tss_cleanup_function> func,
void* tss_data)
{
detail::thread_data_base* const current_thread_data(get_or_make_current_thread_data());
current_thread_data->tss_data.insert(std::make_pair(key,tss_data_node(func,tss_data)));
}
void erase_tss_node(void const* key)
{
detail::thread_data_base* const current_thread_data(get_current_thread_data());
if(current_thread_data)
{
current_thread_data->tss_data.erase(key);
}
}
void set_tss_data(void const* key,
boost::shared_ptr<tss_cleanup_function> func,
void* tss_data,bool cleanup_existing)
{
if(tss_data_node* const current_node=find_tss_data(key))
{
if(cleanup_existing && current_node->func && (current_node->value!=0))
{
(*current_node->func)(current_node->value);
}
if(func || (tss_data!=0))
{
current_node->func=func;
current_node->value=tss_data;
}
else
{
erase_tss_node(key);
}
}
else if(func || (tss_data!=0))
{
add_new_tss_node(key,func,tss_data);
}
}
}
BOOST_THREAD_DECL void notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk)
{
detail::thread_data_base* const current_thread_data(detail::get_current_thread_data());
if(current_thread_data)
{
current_thread_data->notify_all_at_thread_exit(&cond, lk.release());
}
}
namespace detail {
void BOOST_THREAD_DECL make_ready_at_thread_exit(shared_ptr<shared_state_base> as)
{
detail::thread_data_base* const current_thread_data(detail::get_current_thread_data());
if(current_thread_data)
{
current_thread_data->make_ready_at_thread_exit(as);
}
}
}
}
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