b10580464d411570bb2213b0d1366f2adbeed95a
[deb_x265.git] / source / common / winxp.h
1 /*****************************************************************************
2 * Copyright (C) 2013 x265 project
3 *
4 * Authors: Steve Borho <steve@borho.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
19 *
20 * This program is also available under a commercial proprietary license.
21 * For more information, contact us at license @ x265.com
22 *****************************************************************************/
23
24 #ifndef X265_WINXP_H
25 #define X265_WINXP_H
26
27 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) // _WIN32_WINNT_VISTA
28
29 #ifdef _MSC_VER
30 #include <intrin.h> // _InterlockedCompareExchange64
31 #endif
32
33 namespace x265 {
34 /* non-native condition variable */
35 typedef struct
36 {
37 CRITICAL_SECTION broadcastMutex;
38 CRITICAL_SECTION waiterCountMutex;
39 HANDLE semaphore;
40 HANDLE waitersDone;
41 volatile int waiterCount;
42 volatile int bIsBroadcast;
43 } ConditionVariable;
44
45 int WINAPI cond_init(ConditionVariable *cond);
46 void WINAPI cond_broadcast(ConditionVariable *cond);
47 void WINAPI cond_signal(ConditionVariable *cond);
48 BOOL WINAPI cond_wait(ConditionVariable *cond, CRITICAL_SECTION *mutex, DWORD wait);
49 void cond_destroy(ConditionVariable *cond);
50
51 /* map missing API symbols to our structure and functions */
52 #define CONDITION_VARIABLE x265::ConditionVariable
53 #define InitializeConditionVariable x265::cond_init
54 #define SleepConditionVariableCS x265::cond_wait
55 #define WakeConditionVariable x265::cond_signal
56 #define WakeAllConditionVariable x265::cond_broadcast
57 #define XP_CONDITION_VAR_FREE x265::cond_destroy
58
59 #if defined(_MSC_VER)
60
61 /* Windows XP did not define atomic OR 64, but gcc has a good version, so
62 * only use this workaround when targeting XP with MSVC */
63 FORCEINLINE LONGLONG interlocked_OR64(__inout LONGLONG volatile *Destination,
64 __in LONGLONG Value)
65 {
66 LONGLONG Old;
67
68 do
69 {
70 Old = *Destination;
71 }
72 while (_InterlockedCompareExchange64(Destination, Old | Value, Old) != Old);
73
74 return Old;
75 }
76
77 #define ATOMIC_OR(ptr, mask) x265::interlocked_OR64((volatile LONG64*)ptr, mask)
78
79 #if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
80 #pragma intrinsic(_InterlockedCompareExchange64)
81 #endif
82 #endif // defined(_MSC_VER)
83 } // namespace x265
84
85 #else // if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
86
87 #define XP_CONDITION_VAR_FREE(x)
88
89 #endif // _WIN32_WINNT <= _WIN32_WINNT_WINXP
90
91 #endif // ifndef X265_WINXP_H