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

   1 #ifndef REGTEST
   2 #include <threads.h>
   3 #include <windows.h>
   4
   5 int mtx_lock(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     for(;;) {
  15         LONG prev = InterlockedCompareExchange(&mtx->_ThreadId, myId, 0);
  16         if(prev == 0)
  17             return thrd_success;
  18
  19         DWORD rv = WaitForSingleObject(mtx->_WaitEvHandle, INFINITE);
  20         if(rv != WAIT_OBJECT_0)
  21             return thrd_error;
  22     }
  23 }
  24 #endif
  25
  26 #ifdef TEST
  27 #include "_PDCLIB_test.h"
  28
  29 int main( void )
  30 {
  31     return TEST_RESULTS;
  32 }
  33
  34 #endif