diff options
Diffstat (limited to 'FAQ')
| -rw-r--r-- | FAQ | 101 |
1 files changed, 84 insertions, 17 deletions
@@ -16,7 +16,7 @@ Q 4 Cancelation doesn't work for me, why? Q 5 Thread won't block after two calls to mutex_lock -Q 6 How do I generate libpthread.a for use with Mingw32? +Q 6 How do I generate pthreadGCE.dll and libpthreadw32.a for use with Mingw32? ============================================================================= @@ -89,7 +89,8 @@ Q 2 Now that pthreads-win32 builds under Mingw32, why do I get A 2 --- Note: -The latest Mingw32 package now has thread-safe exception handling. +The latest Mingw32 package has thread-safe exception handling. +Make sure you also read A 6 below to get a fully working build. The following email exchange describes the problem. Until this issue is resolved people without the Microsoft compiler can obtain the current @@ -207,7 +208,7 @@ A 4 > win32 programming, so I don't really understand how the *Event() family of > calls work. -Async cancelation should be in post-snapshot-1999-11-02 versions +Async cancelation should be in versions post snapshot-1999-11-02 of pthreads-win32 (currently only for x86 architectures). The answer to your first question is, normal POSIX behaviour would @@ -241,6 +242,7 @@ recognise are those the library implements itself, ie. pthread_cond_timedwait pthread_join sem_wait + pthread_delay_np Pthreads-win32 also provides two functions that allow you to create cancelation points within your application, but only for cases where @@ -294,23 +296,88 @@ Ross ------------------------------------------------------------------------------ -Q 6 How do I generate libpthread.a for use with Mingw32? +Q 6 How do I generate pthreadGCE.dll and libpthreadw32.a for use with Mingw32? --- A 6 --- -> I'm lacking the libpthread.a that -> used to come with the pre-compiled package. The last time this -> library appeared was in 1999-08-12. Without this library I cannot -> use the pre-compiled dll. +Once you've followed Thomas Pfaff's instructions below to fix +Mingw32, then you can simply run "make" to build the library and dll. + + +From - Sat Dec 9 22:56:10 2000 +From: "Thomas Pfaff" <tpfaff@gmx.net> +To: <mingw-users@lists.sourceforge.net>, <pthreads-win32@sources.redhat.com> +Subject: mingw32 DLLs, threads and exceptions HOWTO +Date: Thu, 7 Dec 2000 11:12:43 +0100 + +Dear all, + +this is a summary that should help users to have thread safe exception +handling over DLL exported functions. +If you don't care about c++ exceptions you can stop reading here. + +The first time i struggled with c++ exceptions was when i tried to throw an +exception in a dll exported function where the exception handler resides in +the program module. +Instead of catching the exception the program stopped with an abnormal +termination. +The reason was that the exception code is in libgcc.a. Since this is a +static library the code and some static variables are both in the dll and in +the program module, each module runs in its own context. +It was Franco Bez that pointed me in the right direction, that is convert +libgcc.a into a dll. + +That done i tried to build the pthreads-win32 library, but some tests failed +with an access violation. Due to the fact that the dll was not build +was -mthreads support, eh_context_static instead of eh_context_specific (the +mthreads version) was used for exception handling. +I did a rebuild of the gcc dll with -mthreads, now all tests are passed +(except a nonportable exception test that relies on a MSVC feature). + +To build the gcc dll i did the following steps. + +1. create a temporary directory libgcc +2. copy libgcc.a from gcc-2.95.2\lib\gcc-lib\i386-mingw32\gcc-2.95.2 to that +directory +3. ar -x libgcc.a +4. create a directory tmp and move __main.o, _exit.o and __dummy.o in that +directory +5. build the dll +gcc -shared -mthreads -o gcc.dll *.o +strip gcc.dll +Move this dll into your gcc\bin directory +6. Move _chkstk.o and frame.o to the tmp directory, otherwise you break the +builtin alloca. +7. Build the import library libgcc.a +dllwrap --export-all --dllname=gcc.dll --output-def=libgcc.def --output-lib= +libgcc.a *.o +ar -q libgcc.a tmp/*.o +strip --strip-debug libgcc.a +ranlib libgcc.a +8. save your old libgcc.a, copy the new libgcc.a into +gcc-2.95.2\lib\gcc-lib\i386-mingw32\gcc-2.95.2 + +I am using gcc-2.95.2-1 with Mumits patched binutils-19990818-1and msvcrt +runtime-2000-03-27. +I don't know if this is still required with the current binutils and gcc +since i have seen no sources until now. + +I believe that these steps are at least necessary if you are trying to use +the pthreads-win32 library (which is required if you want to use gtk+ on +win32). +They will make mingw32 a real replacement for MSVC (at least for me). + +What is left: + +1. Include the mingwm10.dll function into the gcc.dll to have only one dll +left. +2. make -mthreads and -fnative-struct default compiler options. +3. convert libstdc++ to a dll by adding the declspec dllexport and dllimport +to every class definition. -You can create libpthread.a from the .def file, should work along these -lines: - -$(DLLTOOL) --as $(AS) -k --dllname libpthread.dll --output-lib -libpthread.a --def $(srcdir)/libpthread.def - -Where DLLTOOL is i686-pc-cygwin-dlltool -and AS i686-pc-cygwin-as. +Regards, + Thomas -Thomas Sailer <sailer@ife.ee.ethz.ch> +------------------------------------------------------------------------------ + |