mono/utils/mono-os-semaphore.h

   1 /*
   2  * mono-os-semaphore.h:  Definitions for generic semaphore usage
   3  *
   4  * Author:
   5  *      Geoff Norton  <gnorton@novell.com>
   6  *
   7  * (C) 2009 Novell, Inc.
   8  */
   9
  10 #ifndef _MONO_SEMAPHORE_H_
  11 #define _MONO_SEMAPHORE_H_
  12
  13 #include <config.h>
  14 #include <glib.h>
  15
  16 #include <errno.h>
  17
  18 #ifdef HAVE_SYS_TIME_H
  19 #include <sys/time.h>
  20 #endif
  21
  22 #ifdef HAVE_UNISTD_H
  23 #include <unistd.h>
  24 #endif
  25
  26 #if defined(USE_MACH_SEMA)
  27 #include <mach/mach_init.h>
  28 #include <mach/task.h>
  29 #include <mach/semaphore.h>
  30 #elif !defined(HOST_WIN32) && defined(HAVE_SEMAPHORE_H)
  31 #include <semaphore.h>
  32 #else
  33 #include <winsock2.h>
  34 #include <windows.h>
  35 #endif
  36
  37 #define MONO_HAS_SEMAPHORES 1
  38
  39 #ifndef NSEC_PER_SEC
  40 #define NSEC_PER_SEC (1000 * 1000 * 1000)
  41 #endif
  42
  43 #ifndef MONO_INFINITE_WAIT
  44 #define MONO_INFINITE_WAIT ((guint32) 0xFFFFFFFF)
  45 #endif
  46
  47 G_BEGIN_DECLS
  48
  49 typedef enum {
  50         MONO_SEM_FLAGS_NONE      = 0,
  51         MONO_SEM_FLAGS_ALERTABLE = 1 << 0,
  52 } MonoSemFlags;
  53
  54 typedef enum {
  55         MONO_SEM_TIMEDWAIT_RET_SUCCESS  =  0,
  56         MONO_SEM_TIMEDWAIT_RET_ALERTED  = -1,
  57         MONO_SEM_TIMEDWAIT_RET_TIMEDOUT = -2,
  58 } MonoSemTimedwaitRet;
  59
  60 #if defined(USE_MACH_SEMA)
  61
  62 typedef semaphore_t MonoSemType;
  63
  64 static inline void
  65 mono_os_sem_init (MonoSemType *sem, int value)
  66 {
  67         kern_return_t res;
  68
  69         res = semaphore_create (current_task (), sem, SYNC_POLICY_FIFO, value);
  70         if (G_UNLIKELY (res != KERN_SUCCESS))
  71                 g_error ("%s: semaphore_create failed with error %d", __func__, res);
  72 }
  73
  74 static inline void
  75 mono_os_sem_destroy (MonoSemType *sem)
  76 {
  77         kern_return_t res;
  78
  79         res = semaphore_destroy (current_task (), *sem);
  80         if (G_UNLIKELY (res != KERN_SUCCESS))
  81                 g_error ("%s: semaphore_destroy failed with error %d", __func__, res);
  82 }
  83
  84 static inline int
  85 mono_os_sem_wait (MonoSemType *sem, MonoSemFlags flags)
  86 {
  87         kern_return_t res;
  88
  89 retry:
  90         res = semaphore_wait (*sem);
  91         if (G_UNLIKELY (res != KERN_SUCCESS && res != KERN_ABORTED))
  92                 g_error ("%s: semaphore_wait failed with error %d", __func__, res);
  93
  94         if (res == KERN_ABORTED && !(flags & MONO_SEM_FLAGS_ALERTABLE))
  95                 goto retry;
  96
  97         return res != KERN_SUCCESS ? -1 : 0;
  98 }
  99
 100 static inline MonoSemTimedwaitRet
 101 mono_os_sem_timedwait (MonoSemType *sem, guint32 timeout_ms, MonoSemFlags flags)
 102 {
 103         kern_return_t res;
 104         int resint;
 105         mach_timespec_t ts, copy;
 106         struct timeval start, current;
 107
 108         if (timeout_ms == MONO_INFINITE_WAIT)
 109                 return (MonoSemTimedwaitRet) mono_os_sem_wait (sem, flags);
 110
 111         ts.tv_sec = timeout_ms / 1000;
 112         ts.tv_nsec = (timeout_ms % 1000) * 1000000;
 113         while (ts.tv_nsec >= NSEC_PER_SEC) {
 114                 ts.tv_nsec -= NSEC_PER_SEC;
 115                 ts.tv_sec++;
 116         }
 117
 118         copy = ts;
 119         resint = gettimeofday (&start, NULL);
 120         if (G_UNLIKELY (resint != 0))
 121                 g_error ("%s: gettimeofday failed with \"%s\" (%d)", __func__, g_strerror (errno), errno);
 122
 123 retry:
 124         res = semaphore_timedwait (*sem, ts);
 125         if (G_UNLIKELY (res != KERN_SUCCESS && res != KERN_ABORTED && res != KERN_OPERATION_TIMED_OUT))
 126                 g_error ("%s: semaphore_timedwait failed with error %d", __func__, res);
 127
 128         if (res == KERN_ABORTED && !(flags & MONO_SEM_FLAGS_ALERTABLE)) {
 129                 ts = copy;
 130
 131                 resint = gettimeofday (&current, NULL);
 132                 if (G_UNLIKELY (resint != 0))
 133                         g_error ("%s: gettimeofday failed with \"%s\" (%d)", __func__, g_strerror (errno), errno);
 134
 135                 ts.tv_sec -= (current.tv_sec - start.tv_sec);
 136                 ts.tv_nsec -= (current.tv_usec - start.tv_usec) * 1000;
 137                 if (ts.tv_nsec < 0) {
 138                         if (ts.tv_sec <= 0) {
 139                                 ts.tv_nsec = 0;
 140                         } else {
 141                                 ts.tv_sec--;
 142                                 ts.tv_nsec += NSEC_PER_SEC;
 143                         }
 144                 }
 145                 if (ts.tv_sec < 0) {
 146                         ts.tv_sec = 0;
 147                         ts.tv_nsec = 0;
 148                 }
 149
 150                 goto retry;
 151         }
 152
 153         switch (res) {
 154         case KERN_SUCCESS:
 155                 return MONO_SEM_TIMEDWAIT_RET_SUCCESS;
 156         case KERN_ABORTED:
 157                 return MONO_SEM_TIMEDWAIT_RET_ALERTED;
 158         case KERN_OPERATION_TIMED_OUT:
 159                 return MONO_SEM_TIMEDWAIT_RET_TIMEDOUT;
 160         default:
 161                 g_assert_not_reached ();
 162         }
 163 }
 164
 165 static inline void
 166 mono_os_sem_post (MonoSemType *sem)
 167 {
 168         kern_return_t res;
 169
 170 retry:
 171         res = semaphore_signal (*sem);
 172         if (G_UNLIKELY (res != KERN_SUCCESS && res != KERN_ABORTED))
 173                 g_error ("%s: semaphore_signal failed with error %d", __func__, res);
 174
 175         if (res == KERN_ABORTED)
 176                 goto retry;
 177 }
 178
 179 #elif !defined(HOST_WIN32) && defined(HAVE_SEMAPHORE_H)
 180
 181 typedef sem_t MonoSemType;
 182
 183 static inline void
 184 mono_os_sem_init (MonoSemType *sem, int value)
 185 {
 186         int res;
 187
 188         res = sem_init (sem, 0, value);
 189         if (G_UNLIKELY (res != 0))
 190                 g_error ("%s: sem_init failed with \"%s\" (%d)", __func__, g_strerror (errno), errno);
 191 }
 192
 193 static inline void
 194 mono_os_sem_destroy (MonoSemType *sem)
 195 {
 196         int res;
 197
 198         res = sem_destroy (sem);
 199         if (G_UNLIKELY (res != 0))
 200                 g_error ("%s: sem_destroy failed with \"%s\" (%d)", __func__, g_strerror (errno), errno);
 201 }
 202
 203 static inline int
 204 mono_os_sem_wait (MonoSemType *sem, MonoSemFlags flags)
 205 {
 206         int res;
 207
 208 retry:
 209         res = sem_wait (sem);
 210         if (G_UNLIKELY (res != 0 && errno != EINTR))
 211                 g_error ("%s: sem_wait failed with \"%s\" (%d)", __func__, g_strerror (errno), errno);
 212
 213         if (res != 0 && errno == EINTR && !(flags & MONO_SEM_FLAGS_ALERTABLE))
 214                 goto retry;
 215
 216         return res != 0 ? -1 : 0;
 217 }
 218
 219 static inline MonoSemTimedwaitRet
 220 mono_os_sem_timedwait (MonoSemType *sem, guint32 timeout_ms, MonoSemFlags flags)
 221 {
 222         struct timespec ts, copy;
 223         struct timeval t;
 224         int res;
 225
 226         if (timeout_ms == 0) {
 227                 res = sem_trywait (sem);
 228                 if (G_UNLIKELY (res != 0 && errno != EINTR && errno != EAGAIN))
 229                         g_error ("%s: sem_trywait failed with \"%s\" (%d)", __func__, g_strerror (errno), errno);
 230
 231                 if (res == 0)
 232                         return MONO_SEM_TIMEDWAIT_RET_SUCCESS;
 233                 else if (errno == EINTR)
 234                         return MONO_SEM_TIMEDWAIT_RET_ALERTED;
 235                 else if (errno == EAGAIN)
 236                         return MONO_SEM_TIMEDWAIT_RET_TIMEDOUT;
 237                 else
 238                         g_assert_not_reached ();
 239         }
 240
 241         if (timeout_ms == MONO_INFINITE_WAIT)
 242                 return (MonoSemTimedwaitRet) mono_os_sem_wait (sem, flags);
 243
 244         res = gettimeofday (&t, NULL);
 245         if (G_UNLIKELY (res != 0))
 246                 g_error ("%s: gettimeofday failed with \"%s\" (%d)", __func__, g_strerror (errno), errno);
 247
 248         ts.tv_sec = timeout_ms / 1000 + t.tv_sec;
 249         ts.tv_nsec = (timeout_ms % 1000) * 1000000 + t.tv_usec * 1000;
 250         while (ts.tv_nsec >= NSEC_PER_SEC) {
 251                 ts.tv_nsec -= NSEC_PER_SEC;
 252                 ts.tv_sec++;
 253         }
 254
 255         copy = ts;
 256
 257 retry:
 258         res = sem_timedwait (sem, &ts);
 259         if (G_UNLIKELY (res != 0 && errno != EINTR && errno != ETIMEDOUT))
 260                 g_error ("%s: sem_timedwait failed with \"%s\" (%d)", __func__, g_strerror (errno), errno);
 261
 262         if (res != 0 && errno == EINTR && !(flags & MONO_SEM_FLAGS_ALERTABLE)) {
 263                 ts = copy;
 264                 goto retry;
 265         }
 266
 267         if (res == 0)
 268                 return MONO_SEM_TIMEDWAIT_RET_SUCCESS;
 269         else if (errno == EINTR)
 270                 return MONO_SEM_TIMEDWAIT_RET_ALERTED;
 271         else if (errno == ETIMEDOUT)
 272                 return MONO_SEM_TIMEDWAIT_RET_TIMEDOUT;
 273         else
 274                 g_assert_not_reached ();
 275 }
 276
 277 static inline void
 278 mono_os_sem_post (MonoSemType *sem)
 279 {
 280         int res;
 281
 282         res = sem_post (sem);
 283         if (G_UNLIKELY (res != 0))
 284                 g_error ("%s: sem_post failed with \"%s\" (%d)", __func__, g_strerror (errno), errno);
 285 }
 286
 287 #else
 288
 289 typedef HANDLE MonoSemType;
 290
 291 static inline void
 292 mono_os_sem_init (MonoSemType *sem, int value)
 293 {
 294 #if G_HAVE_API_SUPPORT(HAVE_CLASSIC_WINAPI_SUPPORT)
 295         *sem = CreateSemaphore (NULL, value, 0x7FFFFFFF, NULL);
 296 #else
 297         *sem = CreateSemaphoreEx (NULL, value, 0x7FFFFFFF, NULL, 0, SEMAPHORE_ALL_ACCESS);
 298 #endif
 299
 300         if (G_UNLIKELY (*sem == NULL))
 301                 g_error ("%s: CreateSemaphore failed with error %d", __func__, GetLastError ());
 302 }
 303
 304 static inline void
 305 mono_os_sem_destroy (MonoSemType *sem)
 306 {
 307         BOOL res;
 308
 309         res = CloseHandle (*sem);
 310         if (G_UNLIKELY (res == 0))
 311                 g_error ("%s: CloseHandle failed with error %d", __func__, GetLastError ());
 312 }
 313
 314 static inline MonoSemTimedwaitRet
 315 mono_os_sem_timedwait (MonoSemType *sem, guint32 timeout_ms, MonoSemFlags flags)
 316 {
 317         BOOL res;
 318
 319 retry:
 320         res = WaitForSingleObjectEx (*sem, timeout_ms, flags & MONO_SEM_FLAGS_ALERTABLE);
 321         if (G_UNLIKELY (res != WAIT_OBJECT_0 && res != WAIT_IO_COMPLETION && res != WAIT_TIMEOUT))
 322                 g_error ("%s: WaitForSingleObjectEx failed with error %d", __func__, GetLastError ());
 323
 324         if (res == WAIT_IO_COMPLETION && !(flags & MONO_SEM_FLAGS_ALERTABLE))
 325                 goto retry;
 326
 327         switch (res) {
 328         case WAIT_OBJECT_0:
 329                 return MONO_SEM_TIMEDWAIT_RET_SUCCESS;
 330         case WAIT_IO_COMPLETION:
 331                 return MONO_SEM_TIMEDWAIT_RET_ALERTED;
 332         case WAIT_TIMEOUT:
 333                 return MONO_SEM_TIMEDWAIT_RET_TIMEDOUT;
 334         default:
 335                 g_assert_not_reached ();
 336         }
 337 }
 338
 339 static inline int
 340 mono_os_sem_wait (MonoSemType *sem, MonoSemFlags flags)
 341 {
 342         return mono_os_sem_timedwait (sem, INFINITE, flags) != 0 ? -1 : 0;
 343 }
 344
 345 static inline void
 346 mono_os_sem_post (MonoSemType *sem)
 347 {
 348         BOOL res;
 349
 350         res = ReleaseSemaphore (*sem, 1, NULL);
 351         if (G_UNLIKELY (res == 0))
 352                 g_error ("%s: ReleaseSemaphore failed with error %d", __func__, GetLastError ());
 353 }
 354
 355 #endif
 356
 357 G_END_DECLS
 358
 359 #endif /* _MONO_SEMAPHORE_H_ */