On 18 Apr 2021, at 19:35, Ian MacArthur wrote:
> 
> As an alternate (for those with 64-bit intel machines and a gcc-like compiler on a posix-like host, anyway) I offer the attached, which yields the following numbers:
> 
> Lock time   : 43612 (1 iterations)
> Unlock time : 23426 (1 iterations)
> Lock time   : 48 (10 iterations)
> Unlock time : 44 (10 iterations)
> Lock time   : 122 (100 iterations)
> Unlock time : 43 (100 iterations)


Here’s a revised version tweaked to build for either Posix or Win32 hosts (still assuming 64-bit intel and gcc tools though.)
I also tweaked it to take the nominal CPU clock speed (in GHz) as a command line parameter...

Running on Win10 on a, nominally, 2.21GHz CPU, I see:

$ ./mutex_test.exe 2.21
Lock time   : 3152 (1 iterations) -- 1426.24ns
Unlock time : 2542 (1 iterations) -- 1150.23ns
Lock time   : 1859 (10 iterations) -- 841.18ns
Unlock time : 5598 (10 iterations) -- 2533.03ns
Lock time   : 1582 (100 iterations) -- 715.84ns
Unlock time : 1526 (100 iterations) -- 690.50ns

$ ./mutex_test.exe 2.21
Lock time   : 2534 (1 iterations) -- 1146.61ns
Unlock time : 2058 (1 iterations) -- 931.22ns
Lock time   : 1606 (10 iterations) -- 726.70ns
Unlock time : 1527 (10 iterations) -- 690.95ns
Lock time   : 1580 (100 iterations) -- 714.93ns
Unlock time : 1528 (100 iterations) -- 691.40ns


Which suggests that the WIN32 mutex is a good bit slower than the MacOS mutex I was testing before.
(Which, actually, I think I knew, now I think about it...)

This is just for info., really.

Code attached...

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