ASMAtomicBitTestAndToggle.asm revision 4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsync; IPRT - ASMAtomicBitTestAndToggle().
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4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsync;*******************************************************************************
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsync;* Header Files *
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsync;*******************************************************************************
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsync; Atomically tests and toggles a bit in a bitmap.
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsync; @returns al(rax) true if the bit was set.
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsync; @returns al(rax) false if the bit was clear.
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsync; @param rcx pvBitmap Pointer to the bitmap.
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsync; @param edx iBit The bit to test and toggle.
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsyncBEGINPROC_EXPORTED ASMAtomicBitTestAndToggle
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsync lock btc [rcx], edx
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsync sbb eax, eax
4d939f327b6fe2b8201ab00e2d7e7d12b6d47d23vboxsyncENDPROC ASMAtomicBitTestAndToggle