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.globl Adder .type Adder, @function Adder: pushq %rbp

////////////////////////////////////////////////////////////////////////// // Adder - code executed by one of the threads ////////////////////////////////////////////////////////////////////////// void *Adder(void *arg) { int i; for (i = 0; i < LoopCount; i++) {

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.globl Adder .type Adder, @function Adder: pushq %rbp

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  1. //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// // Adder - code executed by one of the threads ////////////////////////////////////////////////////////////////////////// void *Adder(void *arg) { int i; for (i = 0; i < LoopCount; i++) { GlobalVariable++; } // End of for } // End of Adder .globl Adder .type Adder, @function Adder: pushq %rbp movq %rsp, %rbp movq %rdi, -8(%rbp) movl $0, -12(%rbp) .L10: movl -12(%rbp), %eax cmpl LoopCount(%rip), %eax jl .L13 jmp .L11 .L13: incl GlobalVariable(%rip) leaq -12(%rbp), %rax incl (%rax) jmp .L10 .L11: leave ret .gcc ThreadsRunAmock.c -S So why does ThreadsRunAmock.c give such strange behavior on a multiprocessor??

  2. Intel Architecture Software Developer's Manual, Volume 2: Instruction Set Reference Manual This instruction is NOT atomic!!

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