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);
}
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;
}
}
