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I think I had something like this fixed by diff -u -r1.1 -r1.2 --- ecos/packages/language/c/libc/stdio/current/src/common/fflush.cxx 2001/04/19 16:06:09 1.1 +++ ecos/packages/language/c/libc/stdio/current/src/common/fflush.cxx 2001/12/03 15:27:25 1.2 @@ -86,7 +86,10 @@ } // if else { // valid stream - +#ifdef CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO + if(!stream->flags.last_buffer_op_was_read) +#endif + { if ( stream->trylock_me() ) { err = stream->flush_output_unlocked(); stream->unlock_me(); @@ -94,6 +97,7 @@ } // if else loop_again = true; + } } // else } // if } // for this is in CVS at the time I found it in my tree.. so I just stole the fix from CVS.. let me know if it works.. Dave. On 3 Dec 2001, Robin Farine wrote: > Hi, > > Under some circumstances, my application's UI freezes but background threads > still run. The following scenario causes it to happen: > > 1. Two threads; one, called CLI, handles the command line interface. The > second, say WRK, does some work and prints messages to the console. > > 2. priority(CLI) > priority(WRK) (higher priority, not higher value) > > 3. While WRK is printing a message to stdout, the user hits RETURN which > causes the CLI thread to wake up and display a prompt to stderr. This ends > in cyg_libc_stdio_flush_all_but() with the CLI thread looping endlessly > trying to flush stdout since WRK owns stdout stream's lock and cannot > release it because of its lower priority. > > Did anyone already have this problem? Do the current CVS sources fix it? > > > Thanks, > > Robin > -- David Airlie, Software Engineer, Parthus Technologies plc., Mary Rosse Centre, National Tech Park, Limerick, Ireland. t: +353-61-508116 / f: +353-61-508101 / David.Airlie@parthus.com
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