[Android] Add support for named mutex on mobile platforms in CoreCLR

[kotlarmilos]

Description

The failure occurs inside a background thread created by ThreadTestHelpers.CreateGuardedThread, which is used by RunTestInBackgroundThread.

---- System.IO.IOException : The system cannot open the device or file specified. : '9d82af713f23442b9ac977c74127c177'. One or more system calls failed: mkdtemp("/data/local/tmp/.dotnet.vL0mk2") == nullptr; errno == EACCES;
at System.Threading.Tests.ThreadTestHelpers.<>c__DisplayClass4_0.<CreateGuardedThread>b__1()
at System.Threading.Tests.ThreadTestHelpers.<>c__DisplayClass4_0.<CreateGuardedThread>b__2()
at System.Threading.Tests.ThreadTestHelpers.RunTestInBackgroundThread(Action test)
at System.Threading.Tests.MutexTests.AbandonExisting(String name, WaitHandleWaitType waitType, Int32 waitCount, Int32 notAbandonedWaitIndex, Boolean isNotAbandonedWaitObjectSignaled, Boolean abandonDuringWait, Boolean currentUserOnly, Boolean currentSessionOnly)

The test attempts to create a temporary directory or file in /data/local/tmp/. The system call fails with errno == EACCES because Android does not grant write permissions to that location.

The same issue is expected to occur on Apple mobile platforms.

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[jkoritzinsky]

@kotlarmilos if this doesn't need to be done for .NET 10, I have a PR that will fix this for .NET 11:

#117635

[jkotas]

#117635

I do not think this PR alone is fixing it. We would also need to switch CoreCLR to managed wait subsystem. Is that correct?

[jkoritzinsky]

Yes, you're right. I have a branch for that as well. I'll push that out as a draft and rebase (and mark as blocked).

[jkoritzinsky]

Okay, #117788 is the correct .NET 11 targeted PR for this issue.