Intel ARCHITECTURE IA-32 User Manual download pdf (Page 391)

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101

Multi-Core and Hyper-Threading Technology 7

7-45

Example 7-9 Adding an Offset to the Stack Pointer of Three Threads

Void Func_thread_entry(DWORD *pArg)

{DWORD StackOffset = *pArg;

DWORD var1; // The local variable at this scope may not benefit

DWORD var2; // from the adjustment of the stack pointer that ensue.

// Call runtime library routine to offset stack pointer.

_alloca(StackOffset) ;

}

// Managing per-thread stack offset to create three threads:

// * Code for the thread function

// * Stack accesses within descendant functions (do_foo1, do_foo2)

// are less likely to cause data cache evictions because of the

// stack offset.

do_foo1();

do_foo2();

}

main ()

{

DWORD Stack_offset, ID_Thread1, ID_Thread2, ID_Thread3;

Stack_offset = 1024;

// Stack offset between parent thread and the first child thread.

ID_Thread1 = CreateThread(Func_thread_entry, &Stack_offset);

// Call OS thread API.

Stack_offset = 2048;

ID_Thread2 = CreateThread(Func_thread_entry, &Stack_offset);

Stack_offset = 3072;

ID_Thread3 = CreateThread(Func_thread_entry, &Stack_offset);

}

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Intel ARCHITECTURE IA-32 User Manual Page 391

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