/src/FreeRDP/winpr/libwinpr/synch/init.c
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1 | | /** |
2 | | * WinPR: Windows Portable Runtime |
3 | | * Synchronization Functions |
4 | | * |
5 | | * Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com> |
6 | | * Copyright 2014 Thincast Technologies GmbH |
7 | | * Copyright 2014 Norbert Federa <norbert.federa@thincast.com> |
8 | | * |
9 | | * Licensed under the Apache License, Version 2.0 (the "License"); |
10 | | * you may not use this file except in compliance with the License. |
11 | | * You may obtain a copy of the License at |
12 | | * |
13 | | * http://www.apache.org/licenses/LICENSE-2.0 |
14 | | * |
15 | | * Unless required by applicable law or agreed to in writing, software |
16 | | * distributed under the License is distributed on an "AS IS" BASIS, |
17 | | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
18 | | * See the License for the specific language governing permissions and |
19 | | * limitations under the License. |
20 | | */ |
21 | | |
22 | | #include <winpr/config.h> |
23 | | |
24 | | #include <winpr/synch.h> |
25 | | #include <winpr/interlocked.h> |
26 | | |
27 | | #include "../log.h" |
28 | | #define TAG WINPR_TAG("sync") |
29 | | |
30 | | #if (!defined(_WIN32)) || (defined(_WIN32) && (_WIN32_WINNT < 0x0600)) |
31 | | |
32 | | BOOL winpr_InitOnceBeginInitialize(WINPR_ATTR_UNUSED LPINIT_ONCE lpInitOnce, |
33 | | WINPR_ATTR_UNUSED DWORD dwFlags, |
34 | | WINPR_ATTR_UNUSED PBOOL fPending, |
35 | | WINPR_ATTR_UNUSED LPVOID* lpContext) |
36 | 0 | { |
37 | 0 | WLog_ERR(TAG, "not implemented"); |
38 | 0 | return FALSE; |
39 | 0 | } |
40 | | |
41 | | BOOL winpr_InitOnceComplete(WINPR_ATTR_UNUSED LPINIT_ONCE lpInitOnce, |
42 | | WINPR_ATTR_UNUSED DWORD dwFlags, WINPR_ATTR_UNUSED LPVOID lpContext) |
43 | 0 | { |
44 | 0 | WLog_ERR(TAG, "not implemented"); |
45 | 0 | return FALSE; |
46 | 0 | } |
47 | | |
48 | | VOID winpr_InitOnceInitialize(WINPR_ATTR_UNUSED PINIT_ONCE InitOnce) |
49 | 0 | { |
50 | 0 | WLog_ERR(TAG, "not implemented"); |
51 | 0 | } |
52 | | |
53 | | BOOL winpr_InitOnceExecuteOnce(PINIT_ONCE InitOnce, PINIT_ONCE_FN InitFn, PVOID Parameter, |
54 | | LPVOID* Context) |
55 | 0 | { |
56 | 0 | for (;;) |
57 | 0 | { |
58 | 0 | switch ((ULONG_PTR)InitOnce->Ptr & 3) |
59 | 0 | { |
60 | 0 | case 2: |
61 | | /* already completed successfully */ |
62 | 0 | return TRUE; |
63 | | |
64 | 0 | case 0: |
65 | | |
66 | | /* first time */ |
67 | 0 | if (InterlockedCompareExchangePointer(&InitOnce->Ptr, (PVOID)1, (PVOID)0) != |
68 | 0 | (PVOID)0) |
69 | 0 | { |
70 | | /* some other thread was faster */ |
71 | 0 | break; |
72 | 0 | } |
73 | | |
74 | | /* it's our job to call the init function */ |
75 | 0 | if (InitFn(InitOnce, Parameter, Context)) |
76 | 0 | { |
77 | | /* success */ |
78 | 0 | InitOnce->Ptr = (PVOID)2; |
79 | 0 | return TRUE; |
80 | 0 | } |
81 | | |
82 | | /* the init function returned an error, reset the status */ |
83 | 0 | InitOnce->Ptr = (PVOID)0; |
84 | 0 | return FALSE; |
85 | | |
86 | 0 | case 1: |
87 | | /* in progress */ |
88 | 0 | break; |
89 | | |
90 | 0 | default: |
91 | 0 | WLog_ERR(TAG, "internal error"); |
92 | 0 | return FALSE; |
93 | 0 | } |
94 | | |
95 | 0 | Sleep(5); |
96 | 0 | } |
97 | 0 | } |
98 | | |
99 | | #endif |