void
ArchMultithreadPosix::refThread(ArchThreadImpl* thread)
{
assert(thread != NULL);
assert(findNoRef(thread->m_thread) != NULL);
++thread->m_refCount;
}
HANDLE
ArchMultithreadWindows::getCancelEventForCurrentThread()
{
lockMutex(m_threadMutex);
ArchThreadImpl* thread = findNoRef(GetCurrentThreadId());
unlockMutex(m_threadMutex);
return thread->m_cancel;
}
void
ArchMultithreadWindows::setNetworkDataForCurrentThread(void* data)
{
lockMutex(m_threadMutex);
ArchThreadImpl* thread = findNoRef(GetCurrentThreadId());
thread->m_networkData = data;
unlockMutex(m_threadMutex);
}
ArchThreadImpl*
ArchMultithreadWindows::find(DWORD id)
{
ArchThreadImpl* impl = findNoRef(id);
if (impl != NULL) {
refThread(impl);
}
return impl;
}
ArchThreadImpl*
ArchMultithreadPosix::find(pthread_t thread)
{
ArchThreadImpl* impl = findNoRef(thread);
if (impl != NULL) {
refThread(impl);
}
return impl;
}
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;
}
}
void
ArchMultithreadWindows::testCancelThread()
{
// find current thread
lockMutex(m_threadMutex);
ArchThreadImpl* thread = findNoRef(GetCurrentThreadId());
unlockMutex(m_threadMutex);
// test cancel on thread
testCancelThreadImpl(thread);
}
void
ArchMultithreadPosix::testCancelThread()
{
// find current thread
lockMutex(m_threadMutex);
ArchThreadImpl* thread = findNoRef(pthread_self());
unlockMutex(m_threadMutex);
// test cancel on thread
testCancelThreadImpl(thread);
}
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::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 != NULL) {
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;
}
}
bool
ArchMultithreadWindows::wait(ArchThread target, double timeout)
{
assert(target != NULL);
lockMutex(m_threadMutex);
// find current thread
ArchThreadImpl* self = findNoRef(GetCurrentThreadId());
// 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);
// convert timeout
DWORD t;
if (timeout < 0.0) {
t = INFINITE;
}
else {
t = (DWORD)(1000.0 * timeout);
}
// wait for this thread to be cancelled or woken up or for the
// target thread to terminate.
HANDLE handles[2];
handles[0] = target->m_exit;
handles[1] = self->m_cancel;
DWORD result = WaitForMultipleObjects(2, handles, FALSE, t);
// cancel takes priority
if (result != WAIT_OBJECT_0 + 1 &&
WaitForSingleObject(handles[1], 0) == WAIT_OBJECT_0) {
result = WAIT_OBJECT_0 + 1;
}
// release target
closeThread(target);
// handle result
switch (result) {
case WAIT_OBJECT_0 + 0:
// target thread terminated
return true;
case WAIT_OBJECT_0 + 1:
// this thread was cancelled. does not return.
testCancelThreadImpl(self);
default:
// timeout or error
return false;
}
}
