WebSVN – HelenOS – Path Comparison – / – /trunk/uspace/libc/ Rev 2229 and /trunk/uspace/libc/ Rev 2230

Ignore whitespace Rev 2229 → Rev 2230

 /trunk/uspace/libc/generic/io/vprintf.c
 ,7 → 36,11
 #include <stdio.h>
 #include <unistd.h>
 #include <io/printf_core.h>
+#include <futex.h>
+#include <async.h>
+static atomic_t printf_futex = FUTEX_INITIALIZER;
 static int vprintf_write(const char *str, size_t count, void *unused)
 {
     return write(1, str, count);
 ,10 → 53,22
  */
 int vprintf(const char *fmt, va_list ap)
 {
-    struct printf_spec ps = {(int(*)(void *, size_t, void *)) vprintf_write, NULL};
+    struct printf_spec ps = {
+        (int (*)(void *, size_t, void *)) vprintf_write,
+         NULL
+    };
+    /*
+     * Prevent other threads to execute printf_core()
+     */
+    futex_down(&printf_futex);
+    /*
+     * Prevent other pseudo threads of the same thread
+     * to execute printf_core()
+     */
+    async_serialize_start();
     int ret = printf_core(fmt, &ps, ap);
+    async_serialize_end();
+    futex_up(&printf_futex);
     return ret;
 }

 /trunk/uspace/libc/generic/io/printf_core.c
 ,7 → 40,6
 #include <io/printf_core.h>
 #include <ctype.h>
 #include <string.h>
-#include <async.h>  /* for pseudo thread serialization */
 #define __PRINTF_FLAG_PREFIX        0x00000001  /**< show prefixes 0x or 0*/
 #define __PRINTF_FLAG_SIGNED        0x00000002  /**< signed / unsigned number */
 ,9 → 443,6
     int width, precision;
     uint64_t flags;
-    /* Don't let other pseudo threads interfere. */
-    async_serialize_start();
     counter = 0;
     while ((c = fmt[i])) {
 ,10 → 674,8
         counter += retval;
     }
-    async_serialize_end();
     return counter;
 minus_out:
-    async_serialize_end();
     return -counter;
 }