Hi,
it seems that vswprintf lacks the initialization of the STDIO mutex.
At least on ARM/NPTL, calling this function blocks sometimes.
The following patch solved the problem for me (code copied from vsnprintf.c).
diff -ruN uClibc.orig/libc/stdio/vswprintf.c uClibc/libc/stdio/vswprintf.c
--- uClibc.orig/libc/stdio/vswprintf.c 2010-09-20 15:03:17.000000000 +0200
+++ uClibc/libc/stdio/vswprintf.c 2010-09-22 17:20:00.000000000 +0200
@@ -39,6 +39,11 @@
__INIT_MBSTATE(&(f.__state));
#endif /* __STDIO_MBSTATE */
+#if (defined(__STDIO_BUFFERS) || defined(__USE_OLD_VFPRINTF__)) &&
defined(__UCLIBC_HAS_THREADS__)
+ f.__user_locking = 1; /* Set user locking. */
+ STDIO_INIT_MUTEX(f.__lock);
+#endif
+
f.__nextopen = NULL;
if (size > ((SIZE_MAX - (size_t) buf)/sizeof(wchar_t))) {
--
Thomas Rauscher
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