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      1 /* Threads.c -- multithreading library
      2 2013-11-12 : Igor Pavlov : Public domain */
      3 
      4 #include "Precomp.h"
      5 
      6 #ifndef _WIN32_WCE
      7 #include <process.h>
      8 #endif
      9 
     10 #include "Threads.h"
     11 
     12 static WRes GetError()
     13 {
     14   DWORD res = GetLastError();
     15   return (res) ? (WRes)(res) : 1;
     16 }
     17 
     18 WRes HandleToWRes(HANDLE h) { return (h != 0) ? 0 : GetError(); }
     19 WRes BOOLToWRes(BOOL v) { return v ? 0 : GetError(); }
     20 
     21 WRes HandlePtr_Close(HANDLE *p)
     22 {
     23   if (*p != NULL)
     24     if (!CloseHandle(*p))
     25       return GetError();
     26   *p = NULL;
     27   return 0;
     28 }
     29 
     30 WRes Handle_WaitObject(HANDLE h) { return (WRes)WaitForSingleObject(h, INFINITE); }
     31 
     32 WRes Thread_Create(CThread *p, THREAD_FUNC_TYPE func, LPVOID param)
     33 {
     34   /* Windows Me/98/95: threadId parameter may not be NULL in _beginthreadex/CreateThread functions */
     35 
     36   #ifdef UNDER_CE
     37 
     38   DWORD threadId;
     39   *p = CreateThread(0, 0, func, param, 0, &threadId);
     40 
     41   #else
     42 
     43   unsigned threadId;
     44   *p = (HANDLE)_beginthreadex(NULL, 0, func, param, 0, &threadId);
     45 
     46   #endif
     47 
     48   /* maybe we must use errno here, but probably GetLastError() is also OK. */
     49   return HandleToWRes(*p);
     50 }
     51 
     52 WRes Event_Create(CEvent *p, BOOL manualReset, int signaled)
     53 {
     54   *p = CreateEvent(NULL, manualReset, (signaled ? TRUE : FALSE), NULL);
     55   return HandleToWRes(*p);
     56 }
     57 
     58 WRes Event_Set(CEvent *p) { return BOOLToWRes(SetEvent(*p)); }
     59 WRes Event_Reset(CEvent *p) { return BOOLToWRes(ResetEvent(*p)); }
     60 
     61 WRes ManualResetEvent_Create(CManualResetEvent *p, int signaled) { return Event_Create(p, TRUE, signaled); }
     62 WRes AutoResetEvent_Create(CAutoResetEvent *p, int signaled) { return Event_Create(p, FALSE, signaled); }
     63 WRes ManualResetEvent_CreateNotSignaled(CManualResetEvent *p) { return ManualResetEvent_Create(p, 0); }
     64 WRes AutoResetEvent_CreateNotSignaled(CAutoResetEvent *p) { return AutoResetEvent_Create(p, 0); }
     65 
     66 
     67 WRes Semaphore_Create(CSemaphore *p, UInt32 initCount, UInt32 maxCount)
     68 {
     69   *p = CreateSemaphore(NULL, (LONG)initCount, (LONG)maxCount, NULL);
     70   return HandleToWRes(*p);
     71 }
     72 
     73 static WRes Semaphore_Release(CSemaphore *p, LONG releaseCount, LONG *previousCount)
     74   { return BOOLToWRes(ReleaseSemaphore(*p, releaseCount, previousCount)); }
     75 WRes Semaphore_ReleaseN(CSemaphore *p, UInt32 num)
     76   { return Semaphore_Release(p, (LONG)num, NULL); }
     77 WRes Semaphore_Release1(CSemaphore *p) { return Semaphore_ReleaseN(p, 1); }
     78 
     79 WRes CriticalSection_Init(CCriticalSection *p)
     80 {
     81   /* InitializeCriticalSection can raise only STATUS_NO_MEMORY exception */
     82   #ifdef _MSC_VER
     83   __try
     84   #endif
     85   {
     86     InitializeCriticalSection(p);
     87     /* InitializeCriticalSectionAndSpinCount(p, 0); */
     88   }
     89   #ifdef _MSC_VER
     90   __except (EXCEPTION_EXECUTE_HANDLER) { return 1; }
     91   #endif
     92   return 0;
     93 }
     94