World of Might and Magic  0.2.0
Open reimplementation of Might and Magic 6 7 8 game engine
SDL_atomic.h
См. документацию.
1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 
59 #ifndef SDL_atomic_h_
60 #define SDL_atomic_h_
61 
62 #include "SDL_stdinc.h"
63 #include "SDL_platform.h"
64 
65 #include "begin_code.h"
66 
67 /* Set up for C function definitions, even when using C++ */
68 #ifdef __cplusplus
69 extern "C" {
70 #endif
71 
87 /* @{ */
88 
89 typedef int SDL_SpinLock;
90 
98 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicTryLock(SDL_SpinLock *lock);
99 
105 extern DECLSPEC void SDLCALL SDL_AtomicLock(SDL_SpinLock *lock);
106 
112 extern DECLSPEC void SDLCALL SDL_AtomicUnlock(SDL_SpinLock *lock);
113 
114 /* @} *//* SDL AtomicLock */
115 
116 
121 #if defined(_MSC_VER) && (_MSC_VER > 1200) && !defined(__clang__)
122 void _ReadWriteBarrier(void);
123 #pragma intrinsic(_ReadWriteBarrier)
124 #define SDL_CompilerBarrier() _ReadWriteBarrier()
125 #elif (defined(__GNUC__) && !defined(__EMSCRIPTEN__)) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x5120))
126 /* This is correct for all CPUs when using GCC or Solaris Studio 12.1+. */
127 #define SDL_CompilerBarrier() __asm__ __volatile__ ("" : : : "memory")
128 #elif defined(__WATCOMC__)
129 extern _inline void SDL_CompilerBarrier (void);
130 #pragma aux SDL_CompilerBarrier = "" parm [] modify exact [];
131 #else
132 #define SDL_CompilerBarrier() \
133 { SDL_SpinLock _tmp = 0; SDL_AtomicLock(&_tmp); SDL_AtomicUnlock(&_tmp); }
134 #endif
135 
155 extern DECLSPEC void SDLCALL SDL_MemoryBarrierReleaseFunction(void);
156 extern DECLSPEC void SDLCALL SDL_MemoryBarrierAcquireFunction(void);
157 
158 #if defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
159 #define SDL_MemoryBarrierRelease() __asm__ __volatile__ ("lwsync" : : : "memory")
160 #define SDL_MemoryBarrierAcquire() __asm__ __volatile__ ("lwsync" : : : "memory")
161 #elif defined(__GNUC__) && defined(__aarch64__)
162 #define SDL_MemoryBarrierRelease() __asm__ __volatile__ ("dmb ish" : : : "memory")
163 #define SDL_MemoryBarrierAcquire() __asm__ __volatile__ ("dmb ish" : : : "memory")
164 #elif defined(__GNUC__) && defined(__arm__)
165 #if 0 /* defined(__LINUX__) || defined(__ANDROID__) */
166 /* Information from:
167  https://chromium.googlesource.com/chromium/chromium/+/trunk/base/atomicops_internals_arm_gcc.h#19
168 
169  The Linux kernel provides a helper function which provides the right code for a memory barrier,
170  hard-coded at address 0xffff0fa0
171 */
172 typedef void (*SDL_KernelMemoryBarrierFunc)();
173 #define SDL_MemoryBarrierRelease() ((SDL_KernelMemoryBarrierFunc)0xffff0fa0)()
174 #define SDL_MemoryBarrierAcquire() ((SDL_KernelMemoryBarrierFunc)0xffff0fa0)()
175 #elif 0 /* defined(__QNXNTO__) */
176 #include <sys/cpuinline.h>
177 
178 #define SDL_MemoryBarrierRelease() __cpu_membarrier()
179 #define SDL_MemoryBarrierAcquire() __cpu_membarrier()
180 #else
181 #if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7EM__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) || defined(__ARM_ARCH_8A__)
182 #define SDL_MemoryBarrierRelease() __asm__ __volatile__ ("dmb ish" : : : "memory")
183 #define SDL_MemoryBarrierAcquire() __asm__ __volatile__ ("dmb ish" : : : "memory")
184 #elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6T2__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_5TE__)
185 #ifdef __thumb__
186 /* The mcr instruction isn't available in thumb mode, use real functions */
187 #define SDL_MEMORY_BARRIER_USES_FUNCTION
188 #define SDL_MemoryBarrierRelease() SDL_MemoryBarrierReleaseFunction()
189 #define SDL_MemoryBarrierAcquire() SDL_MemoryBarrierAcquireFunction()
190 #else
191 #define SDL_MemoryBarrierRelease() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" : : "r"(0) : "memory")
192 #define SDL_MemoryBarrierAcquire() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" : : "r"(0) : "memory")
193 #endif /* __thumb__ */
194 #else
195 #define SDL_MemoryBarrierRelease() __asm__ __volatile__ ("" : : : "memory")
196 #define SDL_MemoryBarrierAcquire() __asm__ __volatile__ ("" : : : "memory")
197 #endif /* __LINUX__ || __ANDROID__ */
198 #endif /* __GNUC__ && __arm__ */
199 #else
200 #if (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x5120))
201 /* This is correct for all CPUs on Solaris when using Solaris Studio 12.1+. */
202 #include <mbarrier.h>
203 #define SDL_MemoryBarrierRelease() __machine_rel_barrier()
204 #define SDL_MemoryBarrierAcquire() __machine_acq_barrier()
205 #else
206 /* This is correct for the x86 and x64 CPUs, and we'll expand this over time. */
207 #define SDL_MemoryBarrierRelease() SDL_CompilerBarrier()
208 #define SDL_MemoryBarrierAcquire() SDL_CompilerBarrier()
209 #endif
210 #endif
211 
216 typedef struct { int value; } SDL_atomic_t;
217 
225 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCAS(SDL_atomic_t *a, int oldval, int newval);
226 
232 extern DECLSPEC int SDLCALL SDL_AtomicSet(SDL_atomic_t *a, int v);
233 
237 extern DECLSPEC int SDLCALL SDL_AtomicGet(SDL_atomic_t *a);
238 
246 extern DECLSPEC int SDLCALL SDL_AtomicAdd(SDL_atomic_t *a, int v);
247 
251 #ifndef SDL_AtomicIncRef
252 #define SDL_AtomicIncRef(a) SDL_AtomicAdd(a, 1)
253 #endif
254 
261 #ifndef SDL_AtomicDecRef
262 #define SDL_AtomicDecRef(a) (SDL_AtomicAdd(a, -1) == 1)
263 #endif
264 
272 extern DECLSPEC SDL_bool SDLCALL SDL_AtomicCASPtr(void **a, void *oldval, void *newval);
273 
279 extern DECLSPEC void* SDLCALL SDL_AtomicSetPtr(void **a, void* v);
280 
284 extern DECLSPEC void* SDLCALL SDL_AtomicGetPtr(void **a);
285 
286 /* Ends C function definitions when using C++ */
287 #ifdef __cplusplus
288 }
289 #endif
290 
291 #include "close_code.h"
292 
293 #endif /* SDL_atomic_h_ */
294 
295 /* vi: set ts=4 sw=4 expandtab: */
SDL_AtomicLock
DECLSPEC void SDLCALL SDL_AtomicLock(SDL_SpinLock *lock)
Lock a spin lock by setting it to a non-zero value.
SDL_AtomicGet
DECLSPEC int SDLCALL SDL_AtomicGet(SDL_atomic_t *a)
Get the value of an atomic variable.
v
const GLdouble * v
Definition: SDL_opengl.h:2064
SDL_AtomicTryLock
DECLSPEC SDL_bool SDLCALL SDL_AtomicTryLock(SDL_SpinLock *lock)
Try to lock a spin lock by setting it to a non-zero value.
SDL_AtomicSet
DECLSPEC int SDLCALL SDL_AtomicSet(SDL_atomic_t *a, int v)
Set an atomic variable to a value.
SDL_AtomicSetPtr
DECLSPEC void *SDLCALL SDL_AtomicSetPtr(void **a, void *v)
Set a pointer to a value atomically.
SDL_AtomicAdd
DECLSPEC int SDLCALL SDL_AtomicAdd(SDL_atomic_t *a, int v)
Add to an atomic variable.
close_code.h
SDL_atomic_t::value
int value
Definition: SDL_atomic.h:216
begin_code.h
SDL_AtomicCAS
DECLSPEC SDL_bool SDLCALL SDL_AtomicCAS(SDL_atomic_t *a, int oldval, int newval)
Set an atomic variable to a new value if it is currently an old value.
SDL_AtomicGetPtr
DECLSPEC void *SDLCALL SDL_AtomicGetPtr(void **a)
Get the value of a pointer atomically.
SDL_platform.h
SDL_MemoryBarrierReleaseFunction
DECLSPEC void SDLCALL SDL_MemoryBarrierReleaseFunction(void)
SDL_SpinLock
int SDL_SpinLock
Definition: SDL_atomic.h:89
SDL_MemoryBarrierAcquireFunction
DECLSPEC void SDLCALL SDL_MemoryBarrierAcquireFunction(void)
void
typedef void(SDLCALL *SDL_AudioFilter)(struct SDL_AudioCVT *cvt
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:161
SDL_stdinc.h
SDL_atomic_t
A type representing an atomic integer value. It is a struct so people don't accidentally use numeric ...
Definition: SDL_atomic.h:216
SDL_AtomicCASPtr
DECLSPEC SDL_bool SDLCALL SDL_AtomicCASPtr(void **a, void *oldval, void *newval)
Set a pointer to a new value if it is currently an old value.
a
GLboolean GLboolean GLboolean GLboolean a
Definition: SDL_opengl_glext.h:1112
SDL_AtomicUnlock
DECLSPEC void SDLCALL SDL_AtomicUnlock(SDL_SpinLock *lock)
Unlock a spin lock by setting it to 0. Always returns immediately.
_ReadWriteBarrier
void _ReadWriteBarrier(void)
SDL_KernelMemoryBarrierFunc
void(* SDL_KernelMemoryBarrierFunc)()
Definition: SDL_atomic.h:172
SDL_CompilerBarrier
_inline void SDL_CompilerBarrier(void)