47 lines
1.5 KiB
Text
47 lines
1.5 KiB
Text
#define MaxThreads 10
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Dim Shared As Any Ptr ttylock
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' Teletype unfurls some text across the screen at a given location
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Sub teletype(Byref texto As String, Byval x As Integer, Byval y As Integer)
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' This MutexLock makes simultaneously running threads wait for each other,
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' so only one at a time can continue and print output.
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' Otherwise, their Locates would interfere, since there is only one cursor.
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'
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' It's impossible to predict the order in which threads will arrive here and
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' which one will be the first to acquire the lock thus causing the rest to wait.
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Mutexlock ttylock
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For i As Integer = 0 To (Len(texto) - 1)
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Locate x, y + i : Print Chr(texto[i])
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Sleep 25, 1
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Next i
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' MutexUnlock releases the lock and lets other threads acquire it.
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Mutexunlock ttylock
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End Sub
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Sub thread(Byval userdata As Any Ptr)
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Dim As Integer id = Cint(userdata)
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teletype "Thread #" & id & " .........", 1 + id, 1
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End Sub
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' Create a mutex to syncronize the threads
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ttylock = Mutexcreate()
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' Create child threads
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Dim As Any Ptr handles(0 To MaxThreads-1)
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For i As Integer = 0 To MaxThreads-1
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handles(i) = Threadcreate(@thread, Cptr(Any Ptr, i))
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If handles(i) = 0 Then Print "Error creating thread:"; i : Exit For
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Next i
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' This is the main thread. Now wait until all child threads have finished.
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For i As Integer = 0 To MaxThreads-1
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If handles(i) <> 0 Then Threadwait(handles(i))
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Next i
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' Clean up when finished
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Mutexdestroy(ttylock)
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Sleep
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