[BUG] Poco::NamedMutex crash on MacOS 10.15.7

[hdcscy]

Hello author:
I'm a big fan of the poco library on my work.
Recently, when developing cross-platform applications, I used NamedMutex, and I found that it did not work on macos and crash.

For example:

// NamedMutex object throws exception when constructing.
Poco::NamedMutex mtx("my name");
if (!mtx.tryLock()) {
     // TODO:
}

Poco version: master branch
MacOS version: 10.15.7
CPU architecture: Intel x86_64 & AMD64

[aleks-f]

please send a pull request with test case if you want this fixed in the next release

[matejk]

Exact code fragment as shown in description does not crash on macOS 14.1 (Apple M1) with clang 15. All named mutex tests pass.

Apple clang version 15.0.0 (clang-1500.1.0.2.5)
Target: arm64-apple-darwin23.1.0
Thread model: posix