Multi-thread test of COM components - APARTMENT 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 Apartment.
Component code:
STDMETHODIMP CTEST2 :: Test (long NCNT)
{
Printf ("/ N object test2. 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 Synchronously executes and multiple threads created by the object, you need to manage thread synchronization from the perspective of the component.
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 Can't create objects T2 Coinitialize
At the same time, each thread starts to start each COM object run in the respective call thread T3 CointializeEx COINIT_APARTMENTTHREADED, and each thread is called, each COM object is started in the respective call thread. T4 COINTIALIZEEX COINIT_MULTITHREADED CONTITEDEDEDEDEDEDEDEDEDo
Each thread is started but the object is running in another thread, which seems to be the system created.
YES Coinitialize T5 No Unable to create objects T6 Coinitialize with T2
T7 COINTIALIZEEX COINIT_APARTMENTTHREADED with T2 T8 CointializeEx Coinit_MultithReaded! ! ! note! ! ! Sequential call
Each thread starts every object runs in the same thread, which seems to be created by the system.
CoinitializeEx Coinit_ApartmentthReaded T9 NO
T10 Coinitialize with T2
T11 CointializeEx Coinit_APartmentthreaded with T2
T12 COINTIALIZEEX COINIT_MULTITHREADED Same T8
CoinitializeEx Coinit_multithreaded T13 No T14 Coinitialize with T2 T15 COINTIALIZEEX COINIT_APARTMENTTHREADED T2 T16 COINTIALIZEEX COINIT_MULTITHREADED TO T8 Output Results See Appendix
