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-rw-r--r--src/base/UCommon.pas17
1 files changed, 3 insertions, 14 deletions
diff --git a/src/base/UCommon.pas b/src/base/UCommon.pas
index 6195a680..a52349c0 100644
--- a/src/base/UCommon.pas
+++ b/src/base/UCommon.pas
@@ -504,22 +504,11 @@ begin
end;
{*
- * With FPC console output is not thread-safe.
+ * FPC uses threadvars (TLS) managed by FPC for console output locking.
* Using WriteLn() from external threads (like in SDL callbacks)
- * will damage the heap and crash the program.
- * Most probably FPC uses thread-local-data (TLS) to lock a mutex on
- * the console-buffer. This does not work with external lib's threads
- * because these do not have the TLS data and so it crashes while
- * accessing unallocated memory.
+ * will crash the program as those threadvars have never been initialized.
* The solution is to create an FPC-managed thread which has the TLS data
- * and use it to handle the console-output (hence it is called Console-Handler)
- * It should be safe to do so, but maybe FPC requires the main-thread to access
- * the console-buffer only. In this case output should be delegated to it.
- *
- * TODO: - check if it is safe if an FPC-managed thread different than the
- * main-thread accesses the console-buffer in FPC.
- * - check if Delphi's WriteLn is thread-safe.
- * - check if we need to synchronize file-output too
+ * and use it to handle the console-output (hence it is called Console-Handler)
*}
procedure ConsoleWriteLn(const msg: string);
begin