nsz Git - musl/blob - src/stdio/ftrylockfile.c

   1 #include "stdio_impl.h"
   2 #include "pthread_impl.h"
   3
   4 int ftrylockfile(FILE *f)
   5 {
   6         if (!libc.lockfile) libc.lockfile = __lockfile;
   7         if (f->owner && f->owner == pthread_self()->tid) {
   8                 if (f->lockcount == INT_MAX)
   9                         return -1;
  10                 f->lockcount++;
  11                 return 0;
  12         }
  13         if (a_swap(&f->lock, 1))
  14                 return -1;
  15         f->owner = pthread_self()->tid;
  16         f->lockcount = 1;
  17         return 0;
  18 }