Multi-thread test of COM components - Single Model
Version Information:
version
Author
Fixed / record
Ver 1.0 zzyx 2003-5-16. create
Keywords:
COM multi-threaded thread model Single Apartment Coinitialize CoinitializeEx
Coinit_ApartmentthReaded Coinit_ApartmentthReadeded COINIT_APARTMENTTHREADED
Test object
The component object thread model is Single.
Component code:
STDMETHODIMP CTEST1 :: Test (long NCNT)
{
Printf ("/ N object test1. The thread id:% D", getCurrentThreadId ());
_tzset ();
Char tmpbuf [128];
_STRTIME (TMPBUF);
Printf ("/ N / T Thread ID:% D, Begin Time: / T% S / N", getCurrentThreadId (), TMPBUF);
SLEEP (1000 * NCNT);
_STRTIME (TMPBUF);
Printf ("/ N / T Thread ID:% D, End Time: / T% S / N", getCurrentThreadID (), TMPBUF);
Return S_OK;
}
Object cross-thread call
testing method:
The client creates an object instance and passes the pointer of the object to multiple threads.
Method for calling this instance in each thread
Observe the output
serial number
Client COM environment
result
Experience
S1 NO cannot create an object
S2 Coinitialize Synchronous Execute and Method Create Multiple Thread Synchronization Call From the perspective of the component, you need to manage thread synchronization. Although the components' thread model is Single
S3 CoinitializeEx Coinit_ApartmentthReaded The method of executing the object in the same threaded S4 CoinitializeEx Coinit_MultithReaded is called the thread to create a thread synchronization for COM. But if it is a different method? Logically should be synchronized, not tested
Multi-threaded object instance call
testing method:
Client launch multiple threads
Each thread creates an object instance and calls the object.
Observe the output result.
The test results are as follows:
Main thread
COM environment
serial number
Thread com
surroundings
operation result
NO T1 NO Unable to create objects T2 Coinitialize must call each thread to start the first thread Object Run in the corresponding thread, the second thread creates a COM object failed: CreateInstance Failed, -2147221164 (No registration class) third And the objects of the rear threads are running in additional same threads. It seems that the system is created. T3 CointializeEx Coinit_apartmentthReaded Sequence Call Each thread starts the object of the first thread runs in the corresponding thread in the corresponding thread runs in another same thread. It seems that the system is created. No exception T4 CointializeEx Coinit_MultithReaded order Call each thread is started, but the object is running in another thread, which seems to be an abnormality created by the system.
Coinitialize T5 No Could Create Object T6 Coinitialize? ? ? Phenomenon with T2 Is there an abnormality T7 COINTIAALIZEEX COINIT_APARTMENTTHREADED? ? ? The phenomenon of T2 has an abnormal T8 CointializeEx Coinit_Multithreaded with T4
CoInitializeEx COINIT_APARTMENTTHREADED T9 NO can not create object T10 CoInitialize with abnormal T2 T2 T11 CoIntializeEx COINIT_APARTMENTTHREADED with abnormal T12 CoIntializeEx COINIT_MULTITHREADED can not be created with T4 Yes CoInitializeEx COINIT_MULTITHREADED T13 NO T14 CoInitialize objects called in order to create the first thread of COM objects from running in this thread The COM object created by other threads runs in one of the same threads. It seems that the system created with no exception T15 COINTIALIZEEX COINIT_APARTMENTTHREADEDED T14 T16 COINTIAALIX COINIT_MULTITHREADED The object created in the T4 call all threads is in the same additional thread, the thread seems to Whether there is no abnormality created by the system reference Appendix
