hThread1=CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) ThreadFunc1, NULL, 0, & amp; ThreadID1); 
The CloseHandle (hThread1); 
HThread2=CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) ThreadFunc2, NULL, 0, & amp; ThreadID2); 
The CloseHandle (hThread2); 
HThread3=CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) ThreadFunc3, NULL, 0, & amp; ThreadID3); 
The CloseHandle (hThread3); 


Double a=0; 
A + a=(A1, A2 and A3)/4. 

A main thread, Thread1 for A1, A2 Thread2, Thread3 A3,
Performed for the first time, only A/A1 has value, A2/A3, the return value is 0,
The second executes, normal,

CodePudding user response:

Check the function return value

https://msdn.microsoft.com/en-us/library/ms682453 (vs. 85). Aspx

CodePudding user response:

You should wait for all threads are finished calculation to calculate a=(a + A1, A2 and A3)/4.

CodePudding user response:

You is to create threads, thread has not completed calculation, have to wait after the thread execution, to the calculation results,
Is generally do this: after the thread to send a message to the main thread, the main thread after receiving the message, to calculate again,

CodePudding user response:

"Windows core programming"