Moved exclusion logic to a higher level so that printf output is more readable when the same stdout FILE* is shared

by many pthreads (tasks did not have this probablem because they have separate stdout streams).


git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@174 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 8 insertions, 0 deletions

diff --git a/nuttx/lib/lib_vfprintf.c b/nuttx/lib/lib_vfprintf.c
index 7d1b666a4..fe8b1a744 100644
--- a/nuttx/lib/lib_vfprintf.c
+++ b/nuttx/lib/lib_vfprintf.c
@@ -87,7 +87,15 @@ int vfprintf(FILE *stream, const char *fmt, va_list ap)
        */
 
       lib_stdstream(&stdstream, stream);
+
+      /* Hold the stream semaphore throughout the lib_vsprintf
+       * call so that this thread can get its entire message out
+       * before being pre-empted by the next thread.
+       */
+
+      lib_take_semaphore(stream);
       n = lib_vsprintf(&stdstream.public, fmt, ap);
+      lib_give_semaphore(stream);
     }
   return n;
 }