1 /* Threads.c -- multithreading library
2 2014-09-21 : 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 
GetError()12 static WRes GetError()
13 {
14   DWORD res = GetLastError();
15   return (res) ? (WRes)(res) : 1;
16 }
17 
HandleToWRes(HANDLE h)18 WRes HandleToWRes(HANDLE h) { return (h != 0) ? 0 : GetError(); }
BOOLToWRes(BOOL v)19 WRes BOOLToWRes(BOOL v) { return v ? 0 : GetError(); }
20 
HandlePtr_Close(HANDLE * p)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 
Handle_WaitObject(HANDLE h)30 WRes Handle_WaitObject(HANDLE h) { return (WRes)WaitForSingleObject(h, INFINITE); }
31 
Thread_Create(CThread * p,THREAD_FUNC_TYPE func,LPVOID param)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 
Event_Create(CEvent * p,BOOL manualReset,int signaled)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 
Event_Set(CEvent * p)58 WRes Event_Set(CEvent *p) { return BOOLToWRes(SetEvent(*p)); }
Event_Reset(CEvent * p)59 WRes Event_Reset(CEvent *p) { return BOOLToWRes(ResetEvent(*p)); }
60 
ManualResetEvent_Create(CManualResetEvent * p,int signaled)61 WRes ManualResetEvent_Create(CManualResetEvent *p, int signaled) { return Event_Create(p, TRUE, signaled); }
AutoResetEvent_Create(CAutoResetEvent * p,int signaled)62 WRes AutoResetEvent_Create(CAutoResetEvent *p, int signaled) { return Event_Create(p, FALSE, signaled); }
ManualResetEvent_CreateNotSignaled(CManualResetEvent * p)63 WRes ManualResetEvent_CreateNotSignaled(CManualResetEvent *p) { return ManualResetEvent_Create(p, 0); }
AutoResetEvent_CreateNotSignaled(CAutoResetEvent * p)64 WRes AutoResetEvent_CreateNotSignaled(CAutoResetEvent *p) { return AutoResetEvent_Create(p, 0); }
65 
66 
Semaphore_Create(CSemaphore * p,UInt32 initCount,UInt32 maxCount)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 
Semaphore_Release(CSemaphore * p,LONG releaseCount,LONG * previousCount)73 static WRes Semaphore_Release(CSemaphore *p, LONG releaseCount, LONG *previousCount)
74   { return BOOLToWRes(ReleaseSemaphore(*p, releaseCount, previousCount)); }
Semaphore_ReleaseN(CSemaphore * p,UInt32 num)75 WRes Semaphore_ReleaseN(CSemaphore *p, UInt32 num)
76   { return Semaphore_Release(p, (LONG)num, NULL); }
Semaphore_Release1(CSemaphore * p)77 WRes Semaphore_Release1(CSemaphore *p) { return Semaphore_ReleaseN(p, 1); }
78 
CriticalSection_Init(CCriticalSection * p)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