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@@ -7,6 +7,8 @@ INDEX Q 1 How do I get pthreads-win32 to link under Cygwin32 or Mingw32? +Q 2 Now that pthreads-win32 builds under Mingw32, why do I get + memory access violations? ============================================================================= @@ -70,3 +72,66 @@ not (yet) threadsafe. Regards, Anders +------------------------------------------------------------------------------ + +Q 2 Now that pthreads-win32 builds under Mingw32, why do I get +--- memory access violations (segfaults)? + +A 2 +--- +The following email exchange describes the problem. Until this issue +is resolved people without the Microsoft compiler can obtain the current +MSVC prebuilt DLL (pthread.{dll,lib,h}) at: + +ftp://sourceware.cygnus.com/pub/pthreads-win32/dll-latest + +Date: Wed, 10 Feb 1999 13:21:01 -0000 +From: "Ruland, Kevin" <Kevin.Ruland@anheuser-busch.com> +Reply-To: POSIX threads on Win32 <pthreads-win32@air.net.au> +To: 'POSIX threads on Win32' <pthreads-win32@air.net.au> +Subject: Mingw32 exceptions not thread safe. + +Hello everyone. + +I asked Mumit Khan, maintainer of egcs for mingw and assorted guru, about +the Known Problem listed below. + +> Known problems +> -------------- +> +> There is an unresolved bug which shows up as a segmentation fault +> (memory access violation) when the library is built using g++. Build +> the test program "eyal1.c" and run with an argument of "2" or +> greater. The argument is the number of threads to run, excluding the +> main thread, so the bug appears with 2 or more worker threads. +> +> Kevin Ruland has traced the exception to the try/catch blocks in +> _pthread_threadStart(). +> + +The official word is: + +<Quote Mumit Khan [khan@xraylith.wisc.edu]> +EGCS-1.1.1 for win32 (either cygwin or crtdll/msvc runtimes) do not have +thread-safe exception support. + +For Cygwin, it'll happen when Cygwin runtime has mature thread safety and +pthread is fully integrated. Then it's just a matter of rebuilding GCC (or +just libgcc in this) with thread safe EH support. + +For Mingw crtdll/msvc, someone needs to write the thread-wrapper for win32 +threads. Anyone who knows win32 threads should be able to do this without +much trouble at all. It's low on my priority list, so unless someone else +volunteers, it'll have to wait. + +Are you willing to take a look? If so, I can provide details. +<\Quote> + +And there you have it! To summarize, it's nice that pthreads compile but they +aren't much use just yet. + +I'll respond to Mumit with 'Okay, what do I need to look at', but may not be +able to tackle it myself. + +Kevin + |