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
GetError()12 static WRes GetError()
13 {
14 DWORD res = GetLastError();
15 return res ? (WRes)res : 1;
16 }
17
HandleToWRes(HANDLE h)18 static WRes HandleToWRes(HANDLE h) { return (h != NULL) ? 0 : GetError(); }
BOOLToWRes(BOOL v)19 static 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 {
25 if (!CloseHandle(*p))
26 return GetError();
27 *p = NULL;
28 }
29 return 0;
30 }
31
Handle_WaitObject(HANDLE h)32 WRes Handle_WaitObject(HANDLE h) { return (WRes)WaitForSingleObject(h, INFINITE); }
33
Thread_Create(CThread * p,THREAD_FUNC_TYPE func,LPVOID param)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
Event_Create(CEvent * p,BOOL manualReset,int signaled)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
Event_Set(CEvent * p)60 WRes Event_Set(CEvent *p) { return BOOLToWRes(SetEvent(*p)); }
Event_Reset(CEvent * p)61 WRes Event_Reset(CEvent *p) { return BOOLToWRes(ResetEvent(*p)); }
62
ManualResetEvent_Create(CManualResetEvent * p,int signaled)63 WRes ManualResetEvent_Create(CManualResetEvent *p, int signaled) { return Event_Create(p, TRUE, signaled); }
AutoResetEvent_Create(CAutoResetEvent * p,int signaled)64 WRes AutoResetEvent_Create(CAutoResetEvent *p, int signaled) { return Event_Create(p, FALSE, signaled); }
ManualResetEvent_CreateNotSignaled(CManualResetEvent * p)65 WRes ManualResetEvent_CreateNotSignaled(CManualResetEvent *p) { return ManualResetEvent_Create(p, 0); }
AutoResetEvent_CreateNotSignaled(CAutoResetEvent * p)66 WRes AutoResetEvent_CreateNotSignaled(CAutoResetEvent *p) { return AutoResetEvent_Create(p, 0); }
67
68
Semaphore_Create(CSemaphore * p,UInt32 initCount,UInt32 maxCount)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
Semaphore_Release(CSemaphore * p,LONG releaseCount,LONG * previousCount)75 static WRes Semaphore_Release(CSemaphore *p, LONG releaseCount, LONG *previousCount)
76 { return BOOLToWRes(ReleaseSemaphore(*p, releaseCount, previousCount)); }
Semaphore_ReleaseN(CSemaphore * p,UInt32 num)77 WRes Semaphore_ReleaseN(CSemaphore *p, UInt32 num)
78 { return Semaphore_Release(p, (LONG)num, NULL); }
Semaphore_Release1(CSemaphore * p)79 WRes Semaphore_Release1(CSemaphore *p) { return Semaphore_ReleaseN(p, 1); }
80
CriticalSection_Init(CCriticalSection * p)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 }
96