tor-browser

The Tor Browser
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Threads.c (2797B)

      1 /* Threads.c -- multithreading library
      2 2017-06-26 : Igor Pavlov : Public domain */
      3 
      4 #include "Precomp.h"
      5 
      6 #ifndef UNDER_CE
      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 static WRes HandleToWRes(HANDLE h) { return (h != NULL) ? 0 : GetError(); }
     19 static WRes BOOLToWRes(BOOL v) { return v ? 0 : GetError(); }
     20 
     21 WRes HandlePtr_Close(HANDLE *p)
     22 {
     23  if (*p != NULL)
     24  {
     25    if (!CloseHandle(*p))
     26      return GetError();
     27    *p = NULL;
     28  }
     29  return 0;
     30 }
     31 
     32 WRes Handle_WaitObject(HANDLE h) { return (WRes)WaitForSingleObject(h, INFINITE); }
     33 
     34 WRes Thread_Create(CThread *p, THREAD_FUNC_TYPE func, LPVOID param)
     35 {
     36  /* Windows Me/98/95: threadId parameter may not be NULL in _beginthreadex/CreateThread functions */
     37  
     38  #ifdef UNDER_CE
     39  
     40  DWORD threadId;
     41  *p = CreateThread(0, 0, func, param, 0, &threadId);
     42 
     43  #else
     44 
     45  unsigned threadId;
     46  *p = (HANDLE)_beginthreadex(NULL, 0, func, param, 0, &threadId);
     47   
     48  #endif
     49 
     50  /* maybe we must use errno here, but probably GetLastError() is also OK. */
     51  return HandleToWRes(*p);
     52 }
     53 
     54 static WRes Event_Create(CEvent *p, BOOL manualReset, int signaled)
     55 {
     56  *p = CreateEvent(NULL, manualReset, (signaled ? TRUE : FALSE), NULL);
     57  return HandleToWRes(*p);
     58 }
     59 
     60 WRes Event_Set(CEvent *p) { return BOOLToWRes(SetEvent(*p)); }
     61 WRes Event_Reset(CEvent *p) { return BOOLToWRes(ResetEvent(*p)); }
     62 
     63 WRes ManualResetEvent_Create(CManualResetEvent *p, int signaled) { return Event_Create(p, TRUE, signaled); }
     64 WRes AutoResetEvent_Create(CAutoResetEvent *p, int signaled) { return Event_Create(p, FALSE, signaled); }
     65 WRes ManualResetEvent_CreateNotSignaled(CManualResetEvent *p) { return ManualResetEvent_Create(p, 0); }
     66 WRes AutoResetEvent_CreateNotSignaled(CAutoResetEvent *p) { return AutoResetEvent_Create(p, 0); }
     67 
     68 
     69 WRes Semaphore_Create(CSemaphore *p, UInt32 initCount, UInt32 maxCount)
     70 {
     71  *p = CreateSemaphore(NULL, (LONG)initCount, (LONG)maxCount, NULL);
     72  return HandleToWRes(*p);
     73 }
     74 
     75 static WRes Semaphore_Release(CSemaphore *p, LONG releaseCount, LONG *previousCount)
     76  { return BOOLToWRes(ReleaseSemaphore(*p, releaseCount, previousCount)); }
     77 WRes Semaphore_ReleaseN(CSemaphore *p, UInt32 num)
     78  { return Semaphore_Release(p, (LONG)num, NULL); }
     79 WRes Semaphore_Release1(CSemaphore *p) { return Semaphore_ReleaseN(p, 1); }
     80 
     81 WRes CriticalSection_Init(CCriticalSection *p)
     82 {
     83  /* InitializeCriticalSection can raise only STATUS_NO_MEMORY exception */
     84  #ifdef _MSC_VER
     85  __try
     86  #endif
     87  {
     88    InitializeCriticalSection(p);
     89    /* InitializeCriticalSectionAndSpinCount(p, 0); */
     90  }
     91  #ifdef _MSC_VER
     92  __except (EXCEPTION_EXECUTE_HANDLER) { return 1; }
     93  #endif
     94  return 0;
     95 }