Question

is sprintf thread safe ?

//Global log buffer 
char logBuffer[20];

logStatus (char * status, int length)
{
  snprintf(logBuffer, 19, status);
  printf ("%s\n", logBuffer);
}

The thread safety of this function totally depends upon the thread safety of snprintf/sprintf .

Updates :
thanks for ur answers .
i dont mind, if the actual contents gts messed up. but want to confirm that the sprintf would not cause a memory corruption / buffer overflow going beyond 20 bytes in this case, when multiple threads are trying to write to logBuffer ?

Answer 1

There is no problem using snprintf() in multiple threads. But here you are writing to a shared string buffer, which I assume is shared across threads.

So your use of this function would not be thread safe.