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DWORD dwC reat ion F l a g s : a bit-flags value that enables you to
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indicate optional flags: that the stack size is for reservation rather than commit purposes (STAC K_S I Z E_PARAM_I S_A_R E S E RVATION), and /or that the thread should be left in a suspended state after C reateTh r e a d returns (CR EATE_SUS P E ND E D) A thread that remains suspended must be resumed with a call to the Kerne132 Res umeTh read API before it will be registered with the runnable thread queue and begin running This can be useful if extra state must be prepared before the thread is able to begin executing We look at thread suspension (S u s pe n d T h read) and resumption later
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C h a pter 3 : T h re a d s
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L PDWO RD l pTh r e a d l d : An output pointer into which the C reateTh r e a d routine will store the newly created thread's process
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wide unique identifier As with the HAN D L E returned, this can some times be used to subsequently interact with the thread More often than not, it's just useful for diagnostics purposes If you don't care about the thread's ID, as is fairly common, you can simply pass NU L L (though on Windows 9 X a valid non-NU L L pointer must be supplied, otherwise C r e a t eTh re ad will attempt to dereference it and fail)
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C r e a t eTh r e a d can fail for a number of reasons, in which case the return
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value will be NU L L and Get L a s t E r r o r may be used to retrieve details about the failure Remember, each thread consumes a notable amount of system resources, including some amount of nonpageable memory, so if system resources are low, thread creation is very likely to fail: your code must be written to handle such cases gracefully, which may mean anything from choosing an alternative code-path or even terminating the program cleanly As a simple example of using C reateTh read, consider Listing 31 In this code, the ma i n routine is automatically called from the process's primary thread, which then invokes C reateTh read to create a second program thread, supplying a function pointer to MyTh readMa i n as l pSta rtAd d r e s s and a pointer to the " He l l o , Wo rld " string as l p P a ramet e r Windows creates and enters the new thread into the scheduler's queue, at which point C r e ateTh r e a d returns and w e make a call t o the Win32 Wa it F o rS i n gleObj ect API, passing the newly created thread's HAN D L E as the argument Though we don't look at the various Win32 wait functions 5, Windows Kernel Synchronization, this API call just causes the primary thread wait for the second thread to exit, allowing us to access and print the thread's exit code before exiting the program
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L I STI N G 3 1 : Creating a new OS thread with Win 3 2's CreateThread fu nction WIN32 c++ C R EATETHR EAD C PP #include < st d i o h > # i n c l u d e <wi ndows h > DWORD WINAPI MyThreadSt a rt ( L PVOI D ) ;
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int main ( int a rgc , wc h a r_t * a rgv [ ] )
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HANDLE hThread j DWORD dwThrea d I d j I I C reate t h e new t h read hThread = C reateThread ( NU L L , 0,
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II II &MyThreadSt a rt , I I " He l l o , Wo rld " , I I 0, II &dwThread Id ) j II
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IpTh readAt t r i b u t e s dwSt a c kS i z e IpSta rtAd d r e s s I p P a ramet e r dwC reat ion F l a g s IpThreadId
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if ( ! hThread )
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f p r i ntf ( st d e r r , " T h read c reation failed : %d \ r \ n " , Get L a s t E rror ( j ret u rn - l j
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} p r i n tf ( " %d : C reated t h read %x ( ID %d ) \ r \ n " , GetC u r rentThread Id ( ) , hThrea d , dwThread Id ) j I I Wait for it to exit and then p r i nt t h e exit code Wait ForSi ngleOb j e c t ( hThrea d , I N F I N I T E ) j DWORD dwExitCod e j GetE xitCodeThrea d ( hThrea d , &dwExitCod e ) j printf ( " %d : Th read exited : %d \ r \ n " , Get C u rrentThread Id ( ) , dwExitCod e ) j CloseHa n d l e ( hThread ) j ret u r n 0 j
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DWORD WINAPI MyThreadSt a rt ( L PVOI D I p P a ramet e r )
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printf ( " %d : R u n n i n g : % s \ r \n " , Get C u r rentThread I d ( ) , reinterp ret_c a s t < c h a r * > ( l p P a ramet e r j ret u r n 0 j
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Notice that we use a few other APIs that haven' t been described yet First, GetC u r rentTh r e a d l d retrieves the ID of the currently executing thread This is the same ID that was returned from C r e a t eTh r e a d ' s I pTh r e a d l d output parameter:
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