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authortobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>2008-10-25 10:21:42 +0000
committertobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>2008-10-25 10:21:42 +0000
commitf0d2b5c1d1e91c70e7e9e0ffd5600bb90a0faf6a (patch)
treeaa0fcce5ad7fbab8bd4ef3473fce1436bb2579e7 /src/base
parent57f6e8e49c35a1e43d73255edc8fb35308563319 (diff)
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Some threading questions cleared:
- file handling is safe as long as only one thread owns the file descriptor - console is safe as long as the thread was created by FPC/Delphi git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@1469 b956fd51-792f-4845-bead-9b4dfca2ff2c
Diffstat (limited to 'src/base')
-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