libretro: adjust some option text
[pcsx_rearmed.git] / frontend / 3ds / pthread.h
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1/* Copyright (C) 2010-2020 The RetroArch team
2 *
3 * ---------------------------------------------------------------------------------------
4 * The following license statement only applies to this file (gx_pthread.h).
5 * ---------------------------------------------------------------------------------------
6 *
7 * Permission is hereby granted, free of charge,
8 * to any person obtaining a copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation the rights to
10 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
11 * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
16 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
19 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21 */
22
23#ifndef _CTR_PTHREAD_WRAP_CTR_
24#define _CTR_PTHREAD_WRAP_CTR_
25
26#include "3ds_utils.h"
27
28#include <time.h>
29#include <errno.h>
30
31#define STACKSIZE (4 * 1024)
32#define FALSE 0
33
34#ifndef PTHREAD_SCOPE_PROCESS
35/* An earlier version of devkitARM does not define the pthread types. Can remove in r54+. */
36
37typedef Thread pthread_t;
38typedef LightLock pthread_mutex_t;
39typedef void* pthread_mutexattr_t;
40typedef int pthread_attr_t;
41typedef LightEvent pthread_cond_t;
42typedef int pthread_condattr_t;
43#endif
44
45#ifndef USE_CTRULIB_2
46/* Backported CondVar API from libctru 2.0, and under its license:
47 https://github.com/devkitPro/libctru
48 Slightly modified for compatibility with older libctru. */
49
50typedef s32 CondVar;
51
52static inline Result syncArbitrateAddress(s32* addr, ArbitrationType type, s32 value)
53{
54 return svcArbitrateAddress(__sync_get_arbiter(), (u32)addr, type, value, 0);
55}
56
57static inline Result syncArbitrateAddressWithTimeout(s32* addr, ArbitrationType type, s32 value, s64 timeout_ns)
58{
59 return svcArbitrateAddress(__sync_get_arbiter(), (u32)addr, type, value, timeout_ns);
60}
61
62static inline void __dmb(void)
63{
64 __asm__ __volatile__("mcr p15, 0, %[val], c7, c10, 5" :: [val] "r" (0) : "memory");
65}
66
67static inline void CondVar_BeginWait(CondVar* cv, LightLock* lock)
68{
69 s32 val;
70 do
71 val = __ldrex(cv) - 1;
72 while (__strex(cv, val));
73 LightLock_Unlock(lock);
74}
75
76static inline bool CondVar_EndWait(CondVar* cv, s32 num_threads)
77{
78 bool hasWaiters;
79 s32 val;
80
81 do {
82 val = __ldrex(cv);
83 hasWaiters = val < 0;
84 if (hasWaiters)
85 {
86 if (num_threads < 0)
87 val = 0;
88 else if (val <= -num_threads)
89 val += num_threads;
90 else
91 val = 0;
92 }
93 } while (__strex(cv, val));
94
95 return hasWaiters;
96}
97
98static inline void CondVar_Init(CondVar* cv)
99{
100 *cv = 0;
101}
102
103static inline void CondVar_Wait(CondVar* cv, LightLock* lock)
104{
105 CondVar_BeginWait(cv, lock);
106 syncArbitrateAddress(cv, ARBITRATION_WAIT_IF_LESS_THAN, 0);
107 LightLock_Lock(lock);
108}
109
110static inline int CondVar_WaitTimeout(CondVar* cv, LightLock* lock, s64 timeout_ns)
111{
112 CondVar_BeginWait(cv, lock);
113
114 bool timedOut = false;
115 Result rc = syncArbitrateAddressWithTimeout(cv, ARBITRATION_WAIT_IF_LESS_THAN_TIMEOUT, 0, timeout_ns);
116 if (R_DESCRIPTION(rc) == RD_TIMEOUT)
117 {
118 timedOut = CondVar_EndWait(cv, 1);
119 __dmb();
120 }
121
122 LightLock_Lock(lock);
123 return timedOut;
124}
125
126static inline void CondVar_WakeUp(CondVar* cv, s32 num_threads)
127{
128 __dmb();
129 if (CondVar_EndWait(cv, num_threads))
130 syncArbitrateAddress(cv, ARBITRATION_SIGNAL, num_threads);
131 else
132 __dmb();
133}
134
135static inline void CondVar_Signal(CondVar* cv)
136{
137 CondVar_WakeUp(cv, 1);
138}
139
140static inline void CondVar_Broadcast(CondVar* cv)
141{
142 CondVar_WakeUp(cv, ARBITRATION_SIGNAL_ALL);
143}
144/* End libctru 2.0 backport */
145#endif
146
147/* libctru threads return void but pthreads return void pointer */
148static bool mutex_inited = false;
149static LightLock safe_double_thread_launch;
150static void *(*start_routine_jump)(void*);
151
152static void ctr_thread_launcher(void* data)
153{
154 void *(*start_routine_jump_safe)(void*) = start_routine_jump;
155 LightLock_Unlock(&safe_double_thread_launch);
156 start_routine_jump_safe(data);
157}
158
159static inline int pthread_create(pthread_t *thread,
160 const pthread_attr_t *attr, void *(*start_routine)(void*), void *arg)
161{
162 s32 prio = 0;
163 Thread new_ctr_thread;
164 int procnum = -2; // use default cpu
165 bool isNew3DS;
166
167 APT_CheckNew3DS(&isNew3DS);
168
169 if (isNew3DS)
170 procnum = 2;
171
172 if (!mutex_inited)
173 {
174 LightLock_Init(&safe_double_thread_launch);
175 mutex_inited = true;
176 }
177
178 /*Must wait if attempting to launch 2 threads at once to prevent corruption of function pointer*/
179 while (LightLock_TryLock(&safe_double_thread_launch) != 0);
180
181 svcGetThreadPriority(&prio, CUR_THREAD_HANDLE);
182
183 start_routine_jump = start_routine;
184 new_ctr_thread = threadCreate(ctr_thread_launcher, arg, STACKSIZE, prio - 1, procnum, FALSE);
185
186 if (!new_ctr_thread)
187 {
188 LightLock_Unlock(&safe_double_thread_launch);
189 return EAGAIN;
190 }
191
192 *thread = (pthread_t)new_ctr_thread;
193 return 0;
194}
195
196static inline pthread_t pthread_self(void)
197{
198 return (pthread_t)threadGetCurrent();
199}
200
201static inline int pthread_mutex_init(pthread_mutex_t *mutex,
202 const pthread_mutexattr_t *attr)
203{
204 LightLock_Init((LightLock *)mutex);
205 return 0;
206}
207
208static inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
209{
210 /*Nothing to destroy*/
211 return 0;
212}
213
214static inline int pthread_mutex_lock(pthread_mutex_t *mutex)
215{
216 LightLock_Lock((LightLock *)mutex);
217 return 0;
218}
219
220static inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
221{
222 LightLock_Unlock((LightLock *)mutex);
223 return 0;
224}
225
226static inline void pthread_exit(void *retval)
227{
228 /*Yes the pointer to int cast is not ideal*/
229 /*threadExit((int)retval);*/
230 (void)retval;
231
232 threadExit(0);
233}
234
235static inline int pthread_detach(pthread_t thread)
236{
237 threadDetach((Thread)thread);
238 return 0;
239}
240
241static inline int pthread_join(pthread_t thread, void **retval)
242{
243 /*retval is ignored*/
244 if(threadJoin((Thread)thread, INT64_MAX))
245 return -1;
246
247 threadFree((Thread)thread);
248
249 return 0;
250}
251
252static inline int pthread_mutex_trylock(pthread_mutex_t *mutex)
253{
254 return LightLock_TryLock((LightLock *)mutex);
255}
256
257static inline int pthread_cond_wait(pthread_cond_t *cond,
258 pthread_mutex_t *mutex)
259{
260 CondVar_Wait((CondVar *)cond, (LightLock *)mutex);
261 return 0;
262}
263
264static inline int pthread_cond_timedwait(pthread_cond_t *cond,
265 pthread_mutex_t *mutex, const struct timespec *abstime)
266{
267 struct timespec now = {0};
268 /* Missing clock_gettime*/
269 struct timeval tm;
270 int retval = 0;
271
272 gettimeofday(&tm, NULL);
273 now.tv_sec = tm.tv_sec;
274 now.tv_nsec = tm.tv_usec * 1000;
275 s64 timeout = (abstime->tv_sec - now.tv_sec) * 1000000000 + (abstime->tv_nsec - now.tv_nsec);
276
277 if (timeout < 0)
278 {
279 retval = ETIMEDOUT;
280 }
281 else if (CondVar_WaitTimeout((CondVar *)cond, (LightLock *)mutex, timeout))
282 {
283 retval = ETIMEDOUT;
284 }
285
286 return retval;
287}
288
289static inline int pthread_cond_init(pthread_cond_t *cond,
290 const pthread_condattr_t *attr)
291{
292 CondVar_Init((CondVar *)cond);
293 return 0;
294}
295
296static inline int pthread_cond_signal(pthread_cond_t *cond)
297{
298 CondVar_Signal((CondVar *)cond);
299 return 0;
300}
301
302static inline int pthread_cond_broadcast(pthread_cond_t *cond)
303{
304 CondVar_Broadcast((CondVar *)cond);
305 return 0;
306}
307
308static inline int pthread_cond_destroy(pthread_cond_t *cond)
309{
310 /*Nothing to destroy*/
311 return 0;
312}
313
314static inline int pthread_equal(pthread_t t1, pthread_t t2)
315{
316 if (threadGetHandle((Thread)t1) == threadGetHandle((Thread)t2))
317 return 1;
318 return 0;
319}
320
321#endif