pd.if.org Git - pdclib/blob - platform/win32/functions/threads/mtx_trylock.c

   1 #ifndef REGTEST
   2 #include <threads.h>
   3 #include <windows.h>
   4
   5 int mtx_trylock(mtx_t *mtx)
   6 {
   7     DWORD myId = GetCurrentThreadId();
   8
   9     if(mtx->_ThreadId == (long) myId) {
  10         mtx->_NestCount++;
  11         return thrd_success;
  12     }
  13
  14     if(mtx->_ThreadId != 0)
  15         return thrd_busy;
  16
  17     LONG prev = InterlockedCompareExchange(&mtx->_ThreadId, myId, 0);
  18     if(prev == 0)
  19         return thrd_success;
  20     else
  21         return thrd_busy;
  22 }
  23 #endif
  24
  25 #ifdef TEST
  26 #include "_PDCLIB_test.h"
  27
  28 int main( void )
  29 {
  30     return TEST_RESULTS;
  31 }
  32
  33 #endif