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Begin by carefully studying and understanding Paul’s previous example.

paul doe wrote: ↑Feb 16, 2025 7:30 Then it has no point. It is returned by value anyway, so you're not really 'protecting' anything.

Yes, it does protect against that:

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  *(f.Bar) = -5

or:

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  var p = f.bar
  *p = -5

To protect the data from modification (including deallocation), I would have declared 'as const long ptr' instead, but that does not change the behavior.

and if at least two threads (including the main thread) use var-len strings.

In FreeBASIC, True / False = -1 / 0 . If you absolutely want to get 1 / 0 instead, you can use for example: ElseIf operators = ">" Then comparisonResult = (total > currentNumber) Return Abs(comparisonResult) ElseIf operators = "<" Then comparisonResult = (total < currentNumber) R...

This all follows my code analysis of badidea's crossword generator (https://www.freebasic.net/forum/viewtopic.php?p=306261#p306261) which was surprised to find no gain from multi-threading but rather a little loss. (see final improvement synthesis in https://www.freebasic.net/forum/viewtopic.php?p=3...

Why is multi-threading performance heavily penalized by many manipulation of var-len strings and var-len arrays? For all pseudo-objects like var-len strings and var-len arrays, only the descriptors can be put into local memory but not the data itself which is always on the heap (only fixed-length d...

Run-time error detected by compiling with the '-exx' option.
Your above correction fixes the bug.

Aborting due to runtime error 6 (out of bounds array access) at line 110 of C:\...\FBIde0.4.6r4_fbc1.20.0\FBIDETEMP.bas::NNINIT(),
'LAYER_SIZES' accessed with invalid index = 5, must be between 0 and 4

badidea wrote: ↑Jan 31, 2025 19:13 What do you have as entry_type?

I am working on a version where all var-len strings have been transformed to 'zstring * 256'.
Therefore:

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type entry_type
	dim as zstring * 256 word, clue
end type

From my last modified code, I added an optimization for the zstring assignment in the recursive function 'recursiveSmart1()' inside the For loop on 'ipw' : - Below, the line in comment is replaced the line that follows it: 'wordPlaced = entries.entry(ipw).word 'line optimized by the following line: ...

Indeed, I think that to be thread safe, all dynamic memory allocations/reallocations/deallocations requests are internally protected by a mutex. So concurrent requests will actually be serialized by this internal locking/unlocking of the mutex. This obviously happens when the user calls these reques...

The 'Space()' (or 'String()') function is a disaster for multi-threading with zstrings (compared to a loop using access by zstring indexes): Type Thread Dim As UInteger value Dim As Any Ptr pHandle Declare Static Sub thread1(ByVal pt As Thread Ptr) Declare Static Sub thread2(ByVal pt As Thread Ptr)...

This one erasedStr = space(len(word)) was an expensive operation. And not needed any more with zstring * 32. Just putting a 0 and the end now. Indeed, with a zstring, you just have to do: erasedStr[len(word)] = 0 '' erasedStr = space(len(word)) if wp.ori = 0 then 'horz for i as isz = 0 to len(word)...

Too good to be true! It is your test code for 'Mid()' that is buggy! After the first loop of [For i ... Next], 'mpos' is not reset to '1', so too easy for all tests of the following loops! Proposed modification: ' Using INSTR Dim s As String = "Hello, FreeBasic!" Dim found As Boolean = Fa...

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