| 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/thread.h> |
| 27 | #include <3ds/synchronization.h> |
| 28 | #include <3ds/svc.h> |
| 29 | #include <time.h> |
| 30 | #include <errno.h> |
| 31 | #include <retro_inline.h> |
| 32 | |
| 33 | #define STACKSIZE (32 * 1024) |
| 34 | |
| 35 | #ifndef PTHREAD_SCOPE_PROCESS |
| 36 | /* An earlier version of devkitARM does not define the pthread types. Can remove in r54+. */ |
| 37 | |
| 38 | typedef Thread pthread_t; |
| 39 | typedef LightLock pthread_mutex_t; |
| 40 | typedef void* pthread_mutexattr_t; |
| 41 | typedef int pthread_attr_t; |
| 42 | typedef uint32_t pthread_cond_t; |
| 43 | typedef int pthread_condattr_t; |
| 44 | #endif |
| 45 | |
| 46 | #ifndef USE_CTRULIB_2 |
| 47 | /* Backported CondVar API from libctru 2.0, and under its license: |
| 48 | https://github.com/devkitPro/libctru |
| 49 | Slightly modified for compatibility with older libctru. */ |
| 50 | |
| 51 | typedef s32 CondVar; |
| 52 | |
| 53 | static INLINE Result syncArbitrateAddress(s32* addr, ArbitrationType type, s32 value) |
| 54 | { |
| 55 | return svcArbitrateAddress(__sync_get_arbiter(), (u32)addr, type, value, 0); |
| 56 | } |
| 57 | |
| 58 | static INLINE Result syncArbitrateAddressWithTimeout(s32* addr, ArbitrationType type, s32 value, s64 timeout_ns) |
| 59 | { |
| 60 | return svcArbitrateAddress(__sync_get_arbiter(), (u32)addr, type, value, timeout_ns); |
| 61 | } |
| 62 | |
| 63 | static INLINE void __dmb(void) |
| 64 | { |
| 65 | __asm__ __volatile__("mcr p15, 0, %[val], c7, c10, 5" :: [val] "r" (0) : "memory"); |
| 66 | } |
| 67 | |
| 68 | static INLINE void CondVar_BeginWait(CondVar* cv, LightLock* lock) |
| 69 | { |
| 70 | s32 val; |
| 71 | do |
| 72 | val = __ldrex(cv) - 1; |
| 73 | while (__strex(cv, val)); |
| 74 | LightLock_Unlock(lock); |
| 75 | } |
| 76 | |
| 77 | static INLINE bool CondVar_EndWait(CondVar* cv, s32 num_threads) |
| 78 | { |
| 79 | bool hasWaiters; |
| 80 | s32 val; |
| 81 | |
| 82 | do { |
| 83 | val = __ldrex(cv); |
| 84 | hasWaiters = val < 0; |
| 85 | if (hasWaiters) |
| 86 | { |
| 87 | if (num_threads < 0) |
| 88 | val = 0; |
| 89 | else if (val <= -num_threads) |
| 90 | val += num_threads; |
| 91 | else |
| 92 | val = 0; |
| 93 | } |
| 94 | } while (__strex(cv, val)); |
| 95 | |
| 96 | return hasWaiters; |
| 97 | } |
| 98 | |
| 99 | static INLINE void CondVar_Init(CondVar* cv) |
| 100 | { |
| 101 | *cv = 0; |
| 102 | } |
| 103 | |
| 104 | static INLINE void CondVar_Wait(CondVar* cv, LightLock* lock) |
| 105 | { |
| 106 | CondVar_BeginWait(cv, lock); |
| 107 | syncArbitrateAddress(cv, ARBITRATION_WAIT_IF_LESS_THAN, 0); |
| 108 | LightLock_Lock(lock); |
| 109 | } |
| 110 | |
| 111 | static INLINE int CondVar_WaitTimeout(CondVar* cv, LightLock* lock, s64 timeout_ns) |
| 112 | { |
| 113 | CondVar_BeginWait(cv, lock); |
| 114 | |
| 115 | bool timedOut = false; |
| 116 | Result rc = syncArbitrateAddressWithTimeout(cv, ARBITRATION_WAIT_IF_LESS_THAN_TIMEOUT, 0, timeout_ns); |
| 117 | if (R_DESCRIPTION(rc) == RD_TIMEOUT) |
| 118 | { |
| 119 | timedOut = CondVar_EndWait(cv, 1); |
| 120 | __dmb(); |
| 121 | } |
| 122 | |
| 123 | LightLock_Lock(lock); |
| 124 | return timedOut; |
| 125 | } |
| 126 | |
| 127 | static INLINE void CondVar_WakeUp(CondVar* cv, s32 num_threads) |
| 128 | { |
| 129 | __dmb(); |
| 130 | if (CondVar_EndWait(cv, num_threads)) |
| 131 | syncArbitrateAddress(cv, ARBITRATION_SIGNAL, num_threads); |
| 132 | else |
| 133 | __dmb(); |
| 134 | } |
| 135 | |
| 136 | static INLINE void CondVar_Signal(CondVar* cv) |
| 137 | { |
| 138 | CondVar_WakeUp(cv, 1); |
| 139 | } |
| 140 | |
| 141 | static INLINE void CondVar_Broadcast(CondVar* cv) |
| 142 | { |
| 143 | CondVar_WakeUp(cv, ARBITRATION_SIGNAL_ALL); |
| 144 | } |
| 145 | /* End libctru 2.0 backport */ |
| 146 | #endif |
| 147 | |
| 148 | /* libctru threads return void but pthreads return void pointer */ |
| 149 | static bool mutex_inited = false; |
| 150 | static LightLock safe_double_thread_launch; |
| 151 | static void *(*start_routine_jump)(void*); |
| 152 | |
| 153 | static void ctr_thread_launcher(void* data) |
| 154 | { |
| 155 | void *(*start_routine_jump_safe)(void*) = start_routine_jump; |
| 156 | LightLock_Unlock(&safe_double_thread_launch); |
| 157 | start_routine_jump_safe(data); |
| 158 | } |
| 159 | |
| 160 | static INLINE int pthread_create(pthread_t *thread, |
| 161 | const pthread_attr_t *attr, void *(*start_routine)(void*), void *arg) |
| 162 | { |
| 163 | s32 prio = 0; |
| 164 | Thread new_ctr_thread; |
| 165 | int procnum = -2; // use default cpu |
| 166 | bool isNew3DS; |
| 167 | |
| 168 | APT_CheckNew3DS(&isNew3DS); |
| 169 | |
| 170 | if (isNew3DS) |
| 171 | procnum = 2; |
| 172 | |
| 173 | if (!mutex_inited) |
| 174 | { |
| 175 | LightLock_Init(&safe_double_thread_launch); |
| 176 | mutex_inited = true; |
| 177 | } |
| 178 | |
| 179 | /*Must wait if attempting to launch 2 threads at once to prevent corruption of function pointer*/ |
| 180 | while (LightLock_TryLock(&safe_double_thread_launch) != 0); |
| 181 | |
| 182 | svcGetThreadPriority(&prio, CUR_THREAD_HANDLE); |
| 183 | |
| 184 | start_routine_jump = start_routine; |
| 185 | new_ctr_thread = threadCreate(ctr_thread_launcher, arg, STACKSIZE, prio - 1, procnum, false); |
| 186 | |
| 187 | if (!new_ctr_thread) |
| 188 | { |
| 189 | LightLock_Unlock(&safe_double_thread_launch); |
| 190 | return EAGAIN; |
| 191 | } |
| 192 | |
| 193 | *thread = (pthread_t)new_ctr_thread; |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | static INLINE pthread_t pthread_self(void) |
| 198 | { |
| 199 | return (pthread_t)threadGetCurrent(); |
| 200 | } |
| 201 | |
| 202 | static INLINE int pthread_mutex_init(pthread_mutex_t *mutex, |
| 203 | const pthread_mutexattr_t *attr) |
| 204 | { |
| 205 | LightLock_Init((LightLock *)mutex); |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static INLINE int pthread_mutex_destroy(pthread_mutex_t *mutex) |
| 210 | { |
| 211 | /*Nothing to destroy*/ |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | static INLINE int pthread_mutex_lock(pthread_mutex_t *mutex) |
| 216 | { |
| 217 | LightLock_Lock((LightLock *)mutex); |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | static INLINE int pthread_mutex_unlock(pthread_mutex_t *mutex) |
| 222 | { |
| 223 | LightLock_Unlock((LightLock *)mutex); |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | static INLINE void pthread_exit(void *retval) |
| 228 | { |
| 229 | /*Yes the pointer to int cast is not ideal*/ |
| 230 | /*threadExit((int)retval);*/ |
| 231 | (void)retval; |
| 232 | |
| 233 | threadExit(0); |
| 234 | } |
| 235 | |
| 236 | static INLINE int pthread_detach(pthread_t thread) |
| 237 | { |
| 238 | threadDetach((Thread)thread); |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static INLINE int pthread_join(pthread_t thread, void **retval) |
| 243 | { |
| 244 | /*retval is ignored*/ |
| 245 | if (threadJoin((Thread)thread, INT64_MAX)) |
| 246 | return -1; |
| 247 | |
| 248 | threadFree((Thread)thread); |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | static INLINE int pthread_mutex_trylock(pthread_mutex_t *mutex) |
| 254 | { |
| 255 | return LightLock_TryLock((LightLock *)mutex); |
| 256 | } |
| 257 | |
| 258 | static INLINE int pthread_cond_wait(pthread_cond_t *cond, |
| 259 | pthread_mutex_t *mutex) |
| 260 | { |
| 261 | CondVar_Wait((CondVar *)cond, (LightLock *)mutex); |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | static INLINE int pthread_cond_timedwait(pthread_cond_t *cond, |
| 266 | pthread_mutex_t *mutex, const struct timespec *abstime) |
| 267 | { |
| 268 | /* Missing clock_gettime*/ |
| 269 | struct timespec now; |
| 270 | struct timeval tm; |
| 271 | int retval = 0; |
| 272 | |
| 273 | do |
| 274 | { |
| 275 | s64 timeout; |
| 276 | gettimeofday(&tm, NULL); |
| 277 | now.tv_sec = tm.tv_sec; |
| 278 | now.tv_nsec = tm.tv_usec * 1000; |
| 279 | |
| 280 | if ((timeout = (abstime->tv_sec - now.tv_sec) * 1000000000 + |
| 281 | (abstime->tv_nsec - now.tv_nsec)) < 0) |
| 282 | { |
| 283 | retval = ETIMEDOUT; |
| 284 | break; |
| 285 | } |
| 286 | |
| 287 | if (!CondVar_WaitTimeout((CondVar *)cond, (LightLock *)mutex, timeout)) |
| 288 | break; |
| 289 | } while (1); |
| 290 | |
| 291 | return retval; |
| 292 | } |
| 293 | |
| 294 | static INLINE int pthread_cond_init(pthread_cond_t *cond, |
| 295 | const pthread_condattr_t *attr) |
| 296 | { |
| 297 | CondVar_Init((CondVar *)cond); |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | static INLINE int pthread_cond_signal(pthread_cond_t *cond) |
| 302 | { |
| 303 | CondVar_Signal((CondVar *)cond); |
| 304 | return 0; |
| 305 | } |
| 306 | |
| 307 | static INLINE int pthread_cond_broadcast(pthread_cond_t *cond) |
| 308 | { |
| 309 | CondVar_Broadcast((CondVar *)cond); |
| 310 | return 0; |
| 311 | } |
| 312 | |
| 313 | static INLINE int pthread_cond_destroy(pthread_cond_t *cond) |
| 314 | { |
| 315 | /*Nothing to destroy*/ |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | static INLINE int pthread_equal(pthread_t t1, pthread_t t2) |
| 320 | { |
| 321 | if (threadGetHandle((Thread)t1) == threadGetHandle((Thread)t2)) |
| 322 | return 1; |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | #endif |