808 lines
20 KiB
C++
808 lines
20 KiB
C++
/*
|
|
* synergy -- mouse and keyboard sharing utility
|
|
* Copyright (C) 2012-2016 Symless Ltd.
|
|
* Copyright (C) 2002 Chris Schoeneman
|
|
*
|
|
* This package is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* found in the file LICENSE that should have accompanied this file.
|
|
*
|
|
* This package is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "arch/unix/ArchMultithreadPosix.h"
|
|
|
|
#include "arch/Arch.h"
|
|
#include "arch/XArch.h"
|
|
|
|
#include <csignal>
|
|
#if TIME_WITH_SYS_TIME
|
|
# include <sys/time.h>
|
|
# include <ctime>
|
|
#else
|
|
# if HAVE_SYS_TIME_H
|
|
# include <sys/time.h>
|
|
# else
|
|
# include <time.h>
|
|
# endif
|
|
#endif
|
|
#include <cerrno>
|
|
|
|
#define SIGWAKEUP SIGUSR1
|
|
|
|
#if !HAVE_PTHREAD_SIGNAL
|
|
// boy, is this platform broken. forget about pthread signal
|
|
// handling and let signals through to every process. synergy
|
|
// will not terminate cleanly when it gets SIGTERM or SIGINT.
|
|
# define pthread_sigmask sigprocmask
|
|
# define pthread_kill(tid_, sig_) kill(0, (sig_))
|
|
# define sigwait(set_, sig_)
|
|
# undef HAVE_POSIX_SIGWAIT
|
|
# define HAVE_POSIX_SIGWAIT 1
|
|
#endif
|
|
|
|
static
|
|
void
|
|
setSignalSet(sigset_t* sigset)
|
|
{
|
|
sigemptyset(sigset);
|
|
sigaddset(sigset, SIGHUP);
|
|
sigaddset(sigset, SIGINT);
|
|
sigaddset(sigset, SIGTERM);
|
|
sigaddset(sigset, SIGUSR2);
|
|
}
|
|
|
|
//
|
|
// ArchThreadImpl
|
|
//
|
|
|
|
class ArchThreadImpl {
|
|
public:
|
|
ArchThreadImpl();
|
|
|
|
public:
|
|
int m_refCount{1};
|
|
IArchMultithread::ThreadID m_id{0};
|
|
pthread_t m_thread{};
|
|
IArchMultithread::ThreadFunc m_func;
|
|
void* m_userData;
|
|
bool m_cancel{false};
|
|
bool m_cancelling{false};
|
|
bool m_exited{false};
|
|
void* m_result;
|
|
void* m_networkData;
|
|
};
|
|
|
|
ArchThreadImpl::ArchThreadImpl() :
|
|
m_func(nullptr),
|
|
m_userData(nullptr),
|
|
m_result(nullptr),
|
|
m_networkData(nullptr)
|
|
{
|
|
// do nothing
|
|
}
|
|
|
|
|
|
//
|
|
// ArchMultithreadPosix
|
|
//
|
|
|
|
ArchMultithreadPosix* ArchMultithreadPosix::s_instance = nullptr;
|
|
|
|
ArchMultithreadPosix::ArchMultithreadPosix() :
|
|
m_newThreadCalled(false),
|
|
m_nextID(0)
|
|
{
|
|
assert(s_instance == NULL);
|
|
|
|
s_instance = this;
|
|
|
|
// no signal handlers
|
|
for (size_t i = 0; i < kNUM_SIGNALS; ++i) {
|
|
m_signalFunc[i] = nullptr;
|
|
m_signalUserData[i] = nullptr;
|
|
}
|
|
|
|
// create mutex for thread list
|
|
m_threadMutex = newMutex();
|
|
|
|
// create thread for calling (main) thread and add it to our
|
|
// list. no need to lock the mutex since we're the only thread.
|
|
m_mainThread = new ArchThreadImpl;
|
|
m_mainThread->m_thread = pthread_self();
|
|
insert(m_mainThread);
|
|
|
|
// install SIGWAKEUP handler. this causes SIGWAKEUP to interrupt
|
|
// system calls. we use that when cancelling a thread to force it
|
|
// to wake up immediately if it's blocked in a system call. we
|
|
// won't need this until another thread is created but it's fine
|
|
// to install it now.
|
|
struct sigaction act{};
|
|
sigemptyset(&act.sa_mask);
|
|
# if defined(SA_INTERRUPT)
|
|
act.sa_flags = SA_INTERRUPT;
|
|
# else
|
|
act.sa_flags = 0;
|
|
# endif
|
|
act.sa_handler = &threadCancel;
|
|
sigaction(SIGWAKEUP, &act, nullptr);
|
|
|
|
// set desired signal dispositions. let SIGWAKEUP through but
|
|
// ignore SIGPIPE (we'll handle EPIPE).
|
|
sigset_t sigset{};
|
|
sigemptyset(&sigset);
|
|
sigaddset(&sigset, SIGWAKEUP);
|
|
pthread_sigmask(SIG_UNBLOCK, &sigset, nullptr);
|
|
sigemptyset(&sigset);
|
|
sigaddset(&sigset, SIGPIPE);
|
|
pthread_sigmask(SIG_BLOCK, &sigset, nullptr);
|
|
}
|
|
|
|
ArchMultithreadPosix::~ArchMultithreadPosix()
|
|
{
|
|
assert(s_instance != NULL);
|
|
|
|
closeMutex(m_threadMutex);
|
|
s_instance = nullptr;
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::setNetworkDataForCurrentThread(void* data)
|
|
{
|
|
lockMutex(m_threadMutex);
|
|
ArchThreadImpl* thread = find(pthread_self());
|
|
thread->m_networkData = data;
|
|
unlockMutex(m_threadMutex);
|
|
}
|
|
|
|
void*
|
|
ArchMultithreadPosix::getNetworkDataForThread(ArchThread thread)
|
|
{
|
|
lockMutex(m_threadMutex);
|
|
void* data = thread->m_networkData;
|
|
unlockMutex(m_threadMutex);
|
|
return data;
|
|
}
|
|
|
|
ArchMultithreadPosix*
|
|
ArchMultithreadPosix::getInstance()
|
|
{
|
|
return s_instance;
|
|
}
|
|
|
|
ArchCond
|
|
ArchMultithreadPosix::newCondVar()
|
|
{
|
|
auto* cond = new ArchCondImpl;
|
|
int status = pthread_cond_init(&cond->m_cond, nullptr);
|
|
(void)status;
|
|
assert(status == 0);
|
|
return cond;
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::closeCondVar(ArchCond cond)
|
|
{
|
|
int status = pthread_cond_destroy(&cond->m_cond);
|
|
(void)status;
|
|
assert(status == 0);
|
|
delete cond;
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::signalCondVar(ArchCond cond)
|
|
{
|
|
int status = pthread_cond_signal(&cond->m_cond);
|
|
(void)status;
|
|
assert(status == 0);
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::broadcastCondVar(ArchCond cond)
|
|
{
|
|
int status = pthread_cond_broadcast(&cond->m_cond);
|
|
(void)status;
|
|
assert(status == 0);
|
|
}
|
|
|
|
bool
|
|
ArchMultithreadPosix::waitCondVar(ArchCond cond,
|
|
ArchMutex mutex, double timeout)
|
|
{
|
|
// we can't wait on a condition variable and also wake it up for
|
|
// cancellation since we don't use posix cancellation. so we
|
|
// must wake up periodically to check for cancellation. we
|
|
// can't simply go back to waiting after the check since the
|
|
// condition may have changed and we'll have lost the signal.
|
|
// so we have to return to the caller. since the caller will
|
|
// always check for spurious wakeups the only drawback here is
|
|
// performance: we're waking up a lot more than desired.
|
|
static const double maxCancellationLatency = 0.1;
|
|
if (timeout < 0.0 || timeout > maxCancellationLatency) {
|
|
timeout = maxCancellationLatency;
|
|
}
|
|
|
|
// see if we should cancel this thread
|
|
testCancelThread();
|
|
|
|
// get final time
|
|
struct timeval now{};
|
|
gettimeofday(&now, nullptr);
|
|
struct timespec finalTime{};
|
|
finalTime.tv_sec = now.tv_sec;
|
|
finalTime.tv_nsec = now.tv_usec * 1000;
|
|
auto timeout_sec = static_cast<long>(timeout);
|
|
auto timeout_nsec = static_cast<long>(1.0e+9 * (timeout - timeout_sec));
|
|
finalTime.tv_sec += timeout_sec;
|
|
finalTime.tv_nsec += timeout_nsec;
|
|
if (finalTime.tv_nsec >= 1000000000) {
|
|
finalTime.tv_nsec -= 1000000000;
|
|
finalTime.tv_sec += 1;
|
|
}
|
|
|
|
// wait
|
|
int status = pthread_cond_timedwait(&cond->m_cond,
|
|
&mutex->m_mutex, &finalTime);
|
|
|
|
// check for cancel again
|
|
testCancelThread();
|
|
|
|
switch (status) {
|
|
case 0:
|
|
// success
|
|
return true;
|
|
|
|
case ETIMEDOUT:
|
|
return false;
|
|
|
|
default:
|
|
assert(0 && "condition variable wait error");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
ArchMutex
|
|
ArchMultithreadPosix::newMutex()
|
|
{
|
|
pthread_mutexattr_t attr{};
|
|
int status = pthread_mutexattr_init(&attr);
|
|
assert(status == 0);
|
|
auto* mutex = new ArchMutexImpl;
|
|
status = pthread_mutex_init(&mutex->m_mutex, &attr);
|
|
assert(status == 0);
|
|
return mutex;
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::closeMutex(ArchMutex mutex)
|
|
{
|
|
int status = pthread_mutex_destroy(&mutex->m_mutex);
|
|
(void)status;
|
|
assert(status == 0);
|
|
delete mutex;
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::lockMutex(ArchMutex mutex)
|
|
{
|
|
int status = pthread_mutex_lock(&mutex->m_mutex);
|
|
|
|
switch (status) {
|
|
case 0:
|
|
// success
|
|
return;
|
|
|
|
case EDEADLK:
|
|
assert(0 && "lock already owned");
|
|
break;
|
|
|
|
case EAGAIN:
|
|
assert(0 && "too many recursive locks");
|
|
break;
|
|
|
|
default:
|
|
assert(0 && "unexpected error");
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::unlockMutex(ArchMutex mutex)
|
|
{
|
|
int status = pthread_mutex_unlock(&mutex->m_mutex);
|
|
|
|
switch (status) {
|
|
case 0:
|
|
// success
|
|
return;
|
|
|
|
case EPERM:
|
|
assert(0 && "thread doesn't own a lock");
|
|
break;
|
|
|
|
default:
|
|
assert(0 && "unexpected error");
|
|
break;
|
|
}
|
|
}
|
|
|
|
ArchThread
|
|
ArchMultithreadPosix::newThread(ThreadFunc func, void* data)
|
|
{
|
|
assert(func != NULL);
|
|
|
|
// initialize signal handler. we do this here instead of the
|
|
// constructor so we can avoid daemonizing (using fork())
|
|
// when there are multiple threads. clients can safely
|
|
// use condition variables and mutexes before creating a
|
|
// new thread and they can safely use the only thread
|
|
// they have access to, the main thread, so they really
|
|
// can't tell the difference.
|
|
if (!m_newThreadCalled) {
|
|
m_newThreadCalled = true;
|
|
#if HAVE_PTHREAD_SIGNAL
|
|
startSignalHandler();
|
|
#endif
|
|
}
|
|
|
|
lockMutex(m_threadMutex);
|
|
|
|
// create thread impl for new thread
|
|
auto* thread = new ArchThreadImpl;
|
|
thread->m_func = func;
|
|
thread->m_userData = data;
|
|
|
|
// create the thread. pthread_create() on RedHat 7.2 smp fails
|
|
// if passed a NULL attr so use a default attr.
|
|
pthread_attr_t attr{};
|
|
int status = pthread_attr_init(&attr);
|
|
if (status == 0) {
|
|
status = pthread_create(&thread->m_thread, &attr,
|
|
&ArchMultithreadPosix::threadFunc, thread);
|
|
pthread_attr_destroy(&attr);
|
|
}
|
|
|
|
// check if thread was started
|
|
if (status != 0) {
|
|
// failed to start thread so clean up
|
|
delete thread;
|
|
thread = nullptr;
|
|
}
|
|
else {
|
|
// add thread to list
|
|
insert(thread);
|
|
|
|
// increment ref count to account for the thread itself
|
|
refThread(thread);
|
|
}
|
|
|
|
// note that the child thread will wait until we release this mutex
|
|
unlockMutex(m_threadMutex);
|
|
|
|
return thread;
|
|
}
|
|
|
|
ArchThread
|
|
ArchMultithreadPosix::newCurrentThread()
|
|
{
|
|
lockMutex(m_threadMutex);
|
|
ArchThreadImpl* thread = find(pthread_self());
|
|
unlockMutex(m_threadMutex);
|
|
assert(thread != NULL);
|
|
return thread;
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::closeThread(ArchThread thread)
|
|
{
|
|
assert(thread != NULL);
|
|
|
|
// decrement ref count and clean up thread if no more references
|
|
if (--thread->m_refCount == 0) {
|
|
// detach from thread (unless it's the main thread)
|
|
if (thread->m_func != nullptr) {
|
|
pthread_detach(thread->m_thread);
|
|
}
|
|
|
|
// remove thread from list
|
|
lockMutex(m_threadMutex);
|
|
assert(findNoRef(thread->m_thread) == thread);
|
|
erase(thread);
|
|
unlockMutex(m_threadMutex);
|
|
|
|
// done with thread
|
|
delete thread;
|
|
}
|
|
}
|
|
|
|
ArchThread
|
|
ArchMultithreadPosix::copyThread(ArchThread thread)
|
|
{
|
|
refThread(thread);
|
|
return thread;
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::cancelThread(ArchThread thread)
|
|
{
|
|
assert(thread != NULL);
|
|
|
|
// set cancel and wakeup flags if thread can be cancelled
|
|
bool wakeup = false;
|
|
lockMutex(m_threadMutex);
|
|
if (!thread->m_exited && !thread->m_cancelling) {
|
|
thread->m_cancel = true;
|
|
wakeup = true;
|
|
}
|
|
unlockMutex(m_threadMutex);
|
|
|
|
// force thread to exit system calls if wakeup is true
|
|
if (wakeup) {
|
|
pthread_kill(thread->m_thread, SIGWAKEUP);
|
|
}
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::setPriorityOfThread(ArchThread thread, int /*n*/)
|
|
{
|
|
assert(thread != NULL);
|
|
|
|
// FIXME
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::testCancelThread()
|
|
{
|
|
// find current thread
|
|
lockMutex(m_threadMutex);
|
|
ArchThreadImpl* thread = findNoRef(pthread_self());
|
|
unlockMutex(m_threadMutex);
|
|
|
|
// test cancel on thread
|
|
testCancelThreadImpl(thread);
|
|
}
|
|
|
|
bool
|
|
ArchMultithreadPosix::wait(ArchThread target, double timeout)
|
|
{
|
|
assert(target != NULL);
|
|
|
|
lockMutex(m_threadMutex);
|
|
|
|
// find current thread
|
|
ArchThreadImpl* self = findNoRef(pthread_self());
|
|
|
|
// ignore wait if trying to wait on ourself
|
|
if (target == self) {
|
|
unlockMutex(m_threadMutex);
|
|
return false;
|
|
}
|
|
|
|
// ref the target so it can't go away while we're watching it
|
|
refThread(target);
|
|
|
|
unlockMutex(m_threadMutex);
|
|
|
|
try {
|
|
// do first test regardless of timeout
|
|
testCancelThreadImpl(self);
|
|
if (isExitedThread(target)) {
|
|
closeThread(target);
|
|
return true;
|
|
}
|
|
|
|
// wait and repeat test if there's a timeout
|
|
if (timeout != 0.0) {
|
|
const double start = ARCH->time();
|
|
do {
|
|
// wait a little
|
|
ARCH->sleep(0.05);
|
|
|
|
// repeat test
|
|
testCancelThreadImpl(self);
|
|
if (isExitedThread(target)) {
|
|
closeThread(target);
|
|
return true;
|
|
}
|
|
|
|
// repeat wait and test until timed out
|
|
} while (timeout < 0.0 || (ARCH->time() - start) <= timeout);
|
|
}
|
|
|
|
closeThread(target);
|
|
return false;
|
|
}
|
|
catch (...) {
|
|
closeThread(target);
|
|
throw;
|
|
}
|
|
}
|
|
|
|
bool
|
|
ArchMultithreadPosix::isSameThread(ArchThread thread1, ArchThread thread2)
|
|
{
|
|
return (thread1 == thread2);
|
|
}
|
|
|
|
bool
|
|
ArchMultithreadPosix::isExitedThread(ArchThread thread)
|
|
{
|
|
lockMutex(m_threadMutex);
|
|
bool exited = thread->m_exited;
|
|
unlockMutex(m_threadMutex);
|
|
return exited;
|
|
}
|
|
|
|
void*
|
|
ArchMultithreadPosix::getResultOfThread(ArchThread thread)
|
|
{
|
|
lockMutex(m_threadMutex);
|
|
void* result = thread->m_result;
|
|
unlockMutex(m_threadMutex);
|
|
return result;
|
|
}
|
|
|
|
IArchMultithread::ThreadID
|
|
ArchMultithreadPosix::getIDOfThread(ArchThread thread)
|
|
{
|
|
return thread->m_id;
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::setSignalHandler(
|
|
ESignal signal, SignalFunc func, void* userData)
|
|
{
|
|
lockMutex(m_threadMutex);
|
|
m_signalFunc[signal] = func;
|
|
m_signalUserData[signal] = userData;
|
|
unlockMutex(m_threadMutex);
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::raiseSignal(ESignal signal)
|
|
{
|
|
lockMutex(m_threadMutex);
|
|
if (m_signalFunc[signal] != nullptr) {
|
|
m_signalFunc[signal](signal, m_signalUserData[signal]);
|
|
pthread_kill(m_mainThread->m_thread, SIGWAKEUP);
|
|
}
|
|
else if (signal == kINTERRUPT || signal == kTERMINATE) {
|
|
ARCH->cancelThread(m_mainThread);
|
|
}
|
|
unlockMutex(m_threadMutex);
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::startSignalHandler()
|
|
{
|
|
// set signal mask. the main thread blocks these signals and
|
|
// the signal handler thread will listen for them.
|
|
sigset_t sigset{}, oldsigset{};
|
|
setSignalSet(&sigset);
|
|
pthread_sigmask(SIG_BLOCK, &sigset, &oldsigset);
|
|
|
|
// fire up the INT and TERM signal handler thread. we could
|
|
// instead arrange to catch and handle these signals but
|
|
// we'd be unable to cancel the main thread since no pthread
|
|
// calls are allowed in a signal handler.
|
|
pthread_attr_t attr{};
|
|
int status = pthread_attr_init(&attr);
|
|
if (status == 0) {
|
|
status = pthread_create(&m_signalThread, &attr,
|
|
&ArchMultithreadPosix::threadSignalHandler,
|
|
nullptr);
|
|
pthread_attr_destroy(&attr);
|
|
}
|
|
if (status != 0) {
|
|
// can't create thread to wait for signal so don't block
|
|
// the signals.
|
|
pthread_sigmask(SIG_UNBLOCK, &oldsigset, nullptr);
|
|
}
|
|
}
|
|
|
|
ArchThreadImpl*
|
|
ArchMultithreadPosix::find(pthread_t thread)
|
|
{
|
|
ArchThreadImpl* impl = findNoRef(thread);
|
|
if (impl != nullptr) {
|
|
refThread(impl);
|
|
}
|
|
return impl;
|
|
}
|
|
|
|
ArchThreadImpl*
|
|
ArchMultithreadPosix::findNoRef(pthread_t thread)
|
|
{
|
|
// linear search
|
|
for (ThreadList::const_iterator index = m_threadList.begin();
|
|
index != m_threadList.end(); ++index) {
|
|
if ((*index)->m_thread == thread) {
|
|
return *index;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::insert(ArchThreadImpl* thread)
|
|
{
|
|
assert(thread != NULL);
|
|
|
|
// thread shouldn't already be on the list
|
|
assert(findNoRef(thread->m_thread) == NULL);
|
|
|
|
// set thread id. note that we don't worry about m_nextID
|
|
// wrapping back to 0 and duplicating thread ID's since the
|
|
// likelihood of synergy running that long is vanishingly
|
|
// small.
|
|
thread->m_id = ++m_nextID;
|
|
|
|
// append to list
|
|
m_threadList.push_back(thread);
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::erase(ArchThreadImpl* thread)
|
|
{
|
|
for (auto index = m_threadList.begin();
|
|
index != m_threadList.end(); ++index) {
|
|
if (*index == thread) {
|
|
m_threadList.erase(index);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::refThread(ArchThreadImpl* thread)
|
|
{
|
|
assert(thread != NULL);
|
|
assert(findNoRef(thread->m_thread) != NULL);
|
|
++thread->m_refCount;
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::testCancelThreadImpl(ArchThreadImpl* thread)
|
|
{
|
|
assert(thread != NULL);
|
|
|
|
// update cancel state
|
|
lockMutex(m_threadMutex);
|
|
bool cancel = false;
|
|
if (thread->m_cancel && !thread->m_cancelling) {
|
|
thread->m_cancelling = true;
|
|
thread->m_cancel = false;
|
|
cancel = true;
|
|
}
|
|
unlockMutex(m_threadMutex);
|
|
|
|
// unwind thread's stack if cancelling
|
|
if (cancel) {
|
|
throw XThreadCancel();
|
|
}
|
|
}
|
|
|
|
void*
|
|
ArchMultithreadPosix::threadFunc(void* vrep)
|
|
{
|
|
// get the thread
|
|
auto* thread = static_cast<ArchThreadImpl*>(vrep);
|
|
|
|
// setup pthreads
|
|
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, nullptr);
|
|
pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, nullptr);
|
|
|
|
// run thread
|
|
s_instance->doThreadFunc(thread);
|
|
|
|
// terminate the thread
|
|
return nullptr;
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::doThreadFunc(ArchThread thread)
|
|
{
|
|
// default priority is slightly below normal
|
|
setPriorityOfThread(thread, 1);
|
|
|
|
// wait for parent to initialize this object
|
|
lockMutex(m_threadMutex);
|
|
unlockMutex(m_threadMutex);
|
|
|
|
void* result = nullptr;
|
|
try {
|
|
// go
|
|
result = (*thread->m_func)(thread->m_userData);
|
|
}
|
|
|
|
catch (XThreadCancel&) {
|
|
// client called cancel()
|
|
}
|
|
catch (...) {
|
|
// note -- don't catch (...) to avoid masking bugs
|
|
lockMutex(m_threadMutex);
|
|
thread->m_exited = true;
|
|
unlockMutex(m_threadMutex);
|
|
closeThread(thread);
|
|
throw;
|
|
}
|
|
|
|
// thread has exited
|
|
lockMutex(m_threadMutex);
|
|
thread->m_result = result;
|
|
thread->m_exited = true;
|
|
unlockMutex(m_threadMutex);
|
|
|
|
// done with thread
|
|
closeThread(thread);
|
|
}
|
|
|
|
void
|
|
ArchMultithreadPosix::threadCancel(int /*unused*/)
|
|
{
|
|
// do nothing
|
|
}
|
|
|
|
void*
|
|
ArchMultithreadPosix::threadSignalHandler(void* /*unused*/)
|
|
{
|
|
// detach
|
|
pthread_detach(pthread_self());
|
|
|
|
// add signal to mask
|
|
sigset_t sigset{};
|
|
setSignalSet(&sigset);
|
|
|
|
// also wait on SIGABRT. on linux (others?) this thread (process)
|
|
// will persist after all the other threads evaporate due to an
|
|
// assert unless we wait on SIGABRT. that means our resources (like
|
|
// the socket we're listening on) are not released and never will be
|
|
// until the lingering thread is killed. i don't know why sigwait()
|
|
// should protect the thread from being killed. note that sigwait()
|
|
// doesn't actually return if we receive SIGABRT and, for some
|
|
// reason, we don't have to block SIGABRT.
|
|
sigaddset(&sigset, SIGABRT);
|
|
|
|
// we exit the loop via thread cancellation in sigwait()
|
|
for (;;) {
|
|
// wait
|
|
#if HAVE_POSIX_SIGWAIT
|
|
int signal = 0;
|
|
sigwait(&sigset, &signal);
|
|
#else
|
|
sigwait(&sigset);
|
|
#endif
|
|
|
|
// if we get here then the signal was raised
|
|
switch (signal) {
|
|
case SIGINT:
|
|
ARCH->raiseSignal(kINTERRUPT);
|
|
break;
|
|
|
|
case SIGTERM:
|
|
ARCH->raiseSignal(kTERMINATE);
|
|
break;
|
|
|
|
case SIGHUP:
|
|
ARCH->raiseSignal(kHANGUP);
|
|
break;
|
|
|
|
case SIGUSR2:
|
|
ARCH->raiseSignal(kUSER);
|
|
break;
|
|
|
|
default:
|
|
// ignore
|
|
break;
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|