Ruby: thread_win32.c Source File

00001 /* -*-c-*- */
00002 /**********************************************************************
00003 
00004   thread_win32.c -
00005 
00006   $Author: ko1 $
00007 
00008   Copyright (C) 2004-2007 Koichi Sasada
00009 
00010 **********************************************************************/
00011 
00012 #ifdef THREAD_SYSTEM_DEPENDENT_IMPLEMENTATION
00013 
00014 #include <process.h>
00015 
00016 #define TIME_QUANTUM_USEC (100 * 1000)
00017 #define RB_CONDATTR_CLOCK_MONOTONIC 1 /* no effect */
00018 
00019 #undef Sleep
00020 
00021 #define native_thread_yield() Sleep(0)
00022 #define remove_signal_thread_list(th)
00023 
00024 static volatile DWORD ruby_native_thread_key = TLS_OUT_OF_INDEXES;
00025 
00026 static int w32_wait_events(HANDLE *events, int count, DWORD timeout, rb_thread_t *th);
00027 static int native_mutex_lock(rb_thread_lock_t *lock);
00028 static int native_mutex_unlock(rb_thread_lock_t *lock);
00029 
00030 static void
00031 w32_error(const char *func)
00032 {
00033     LPVOID lpMsgBuf;
00034     DWORD err = GetLastError();
00035     if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
00036                       FORMAT_MESSAGE_FROM_SYSTEM |
00037                       FORMAT_MESSAGE_IGNORE_INSERTS,
00038                       NULL,
00039                       err,
00040                       MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
00041                       (LPTSTR) & lpMsgBuf, 0, NULL) == 0)
00042         FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
00043                       FORMAT_MESSAGE_FROM_SYSTEM |
00044                       FORMAT_MESSAGE_IGNORE_INSERTS,
00045                       NULL,
00046                       err,
00047                       MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
00048                       (LPTSTR) & lpMsgBuf, 0, NULL);
00049     rb_bug("%s: %s", func, (char*)lpMsgBuf);
00050 }
00051 
00052 static int
00053 w32_mutex_lock(HANDLE lock)
00054 {
00055     DWORD result;
00056     while (1) {
00057         thread_debug("native_mutex_lock: %p\n", lock);
00058         result = w32_wait_events(&lock, 1, INFINITE, 0);
00059         switch (result) {
00060           case WAIT_OBJECT_0:
00061             /* get mutex object */
00062             thread_debug("acquire mutex: %p\n", lock);
00063             return 0;
00064           case WAIT_OBJECT_0 + 1:
00065             /* interrupt */
00066             errno = EINTR;
00067             thread_debug("acquire mutex interrupted: %p\n", lock);
00068             return 0;
00069           case WAIT_TIMEOUT:
00070             thread_debug("timeout mutex: %p\n", lock);
00071             break;
00072           case WAIT_ABANDONED:
00073             rb_bug("win32_mutex_lock: WAIT_ABANDONED");
00074             break;
00075           default:
00076             rb_bug("win32_mutex_lock: unknown result (%ld)", result);
00077             break;
00078         }
00079     }
00080     return 0;
00081 }
00082 
00083 static HANDLE
00084 w32_mutex_create(void)
00085 {
00086     HANDLE lock = CreateMutex(NULL, FALSE, NULL);
00087     if (lock == NULL) {
00088         w32_error("native_mutex_initialize");
00089     }
00090     return lock;
00091 }
00092 
00093 #define GVL_DEBUG 0
00094 
00095 static void
00096 gvl_acquire(rb_vm_t *vm, rb_thread_t *th)
00097 {
00098     w32_mutex_lock(vm->gvl.lock);
00099     if (GVL_DEBUG) fprintf(stderr, "gvl acquire (%p): acquire\n", th);
00100 }
00101 
00102 static void
00103 gvl_release(rb_vm_t *vm)
00104 {
00105     ReleaseMutex(vm->gvl.lock);
00106 }
00107 
00108 static void
00109 gvl_yield(rb_vm_t *vm, rb_thread_t *th)
00110 {
00111   gvl_release(th->vm);
00112   native_thread_yield();
00113   gvl_acquire(vm, th);
00114 }
00115 
00116 
00117 static void
00118 gvl_atfork(rb_vm_t *vm)
00119 {
00120     rb_bug("gvl_atfork() is called on win32");
00121 }
00122 
00123 static void
00124 gvl_init(rb_vm_t *vm)
00125 {
00126     if (GVL_DEBUG) fprintf(stderr, "gvl init\n");
00127     vm->gvl.lock = w32_mutex_create();
00128 }
00129 
00130 static void
00131 gvl_destroy(rb_vm_t *vm)
00132 {
00133     if (GVL_DEBUG) fprintf(stderr, "gvl destroy\n");
00134     CloseHandle(vm->gvl.lock);
00135 }
00136 
00137 static rb_thread_t *
00138 ruby_thread_from_native(void)
00139 {
00140     return TlsGetValue(ruby_native_thread_key);
00141 }
00142 
00143 static int
00144 ruby_thread_set_native(rb_thread_t *th)
00145 {
00146     return TlsSetValue(ruby_native_thread_key, th);
00147 }
00148 
00149 void
00150 Init_native_thread(void)
00151 {
00152     rb_thread_t *th = GET_THREAD();
00153 
00154     ruby_native_thread_key = TlsAlloc();
00155     ruby_thread_set_native(th);
00156     DuplicateHandle(GetCurrentProcess(),
00157                     GetCurrentThread(),
00158                     GetCurrentProcess(),
00159                     &th->thread_id, 0, FALSE, DUPLICATE_SAME_ACCESS);
00160 
00161     th->native_thread_data.interrupt_event = CreateEvent(0, TRUE, FALSE, 0);
00162 
00163     thread_debug("initial thread (th: %p, thid: %p, event: %p)\n",
00164                  th, GET_THREAD()->thread_id,
00165                  th->native_thread_data.interrupt_event);
00166 }
00167 
00168 static void
00169 w32_set_event(HANDLE handle)
00170 {
00171     if (SetEvent(handle) == 0) {
00172         w32_error("w32_set_event");
00173     }
00174 }
00175 
00176 static void
00177 w32_reset_event(HANDLE handle)
00178 {
00179     if (ResetEvent(handle) == 0) {
00180         w32_error("w32_reset_event");
00181     }
00182 }
00183 
00184 static int
00185 w32_wait_events(HANDLE *events, int count, DWORD timeout, rb_thread_t *th)
00186 {
00187     HANDLE *targets = events;
00188     HANDLE intr;
00189     DWORD ret;
00190 
00191     thread_debug("  w32_wait_events events:%p, count:%d, timeout:%ld, th:%p\n",
00192                  events, count, timeout, th);
00193     if (th && (intr = th->native_thread_data.interrupt_event)) {
00194         gvl_acquire(th->vm, th);
00195         if (intr == th->native_thread_data.interrupt_event) {
00196             w32_reset_event(intr);
00197             if (RUBY_VM_INTERRUPTED(th)) {
00198                 w32_set_event(intr);
00199             }
00200 
00201             targets = ALLOCA_N(HANDLE, count + 1);
00202             memcpy(targets, events, sizeof(HANDLE) * count);
00203 
00204             targets[count++] = intr;
00205             thread_debug("  * handle: %p (count: %d, intr)\n", intr, count);
00206         }
00207         gvl_release(th->vm);
00208     }
00209 
00210     thread_debug("  WaitForMultipleObjects start (count: %d)\n", count);
00211     ret = WaitForMultipleObjects(count, targets, FALSE, timeout);
00212     thread_debug("  WaitForMultipleObjects end (ret: %lu)\n", ret);
00213 
00214     if (ret == (DWORD)(WAIT_OBJECT_0 + count - 1) && th) {
00215         errno = EINTR;
00216     }
00217     if (ret == WAIT_FAILED && THREAD_DEBUG) {
00218         int i;
00219         DWORD dmy;
00220         for (i = 0; i < count; i++) {
00221             thread_debug("  * error handle %d - %s\n", i,
00222                          GetHandleInformation(targets[i], &dmy) ? "OK" : "NG");
00223         }
00224     }
00225     return ret;
00226 }
00227 
00228 static void ubf_handle(void *ptr);
00229 #define ubf_select ubf_handle
00230 
00231 int
00232 rb_w32_wait_events_blocking(HANDLE *events, int num, DWORD timeout)
00233 {
00234     return w32_wait_events(events, num, timeout, GET_THREAD());
00235 }
00236 
00237 int
00238 rb_w32_wait_events(HANDLE *events, int num, DWORD timeout)
00239 {
00240     int ret;
00241 
00242     BLOCKING_REGION(ret = rb_w32_wait_events_blocking(events, num, timeout),
00243                     ubf_handle, GET_THREAD());
00244     return ret;
00245 }
00246 
00247 static void
00248 w32_close_handle(HANDLE handle)
00249 {
00250     if (CloseHandle(handle) == 0) {
00251         w32_error("w32_close_handle");
00252     }
00253 }
00254 
00255 static void
00256 w32_resume_thread(HANDLE handle)
00257 {
00258     if (ResumeThread(handle) == (DWORD)-1) {
00259         w32_error("w32_resume_thread");
00260     }
00261 }
00262 
00263 #ifdef _MSC_VER
00264 #define HAVE__BEGINTHREADEX 1
00265 #else
00266 #undef HAVE__BEGINTHREADEX
00267 #endif
00268 
00269 #ifdef HAVE__BEGINTHREADEX
00270 #define start_thread (HANDLE)_beginthreadex
00271 #define thread_errno errno
00272 typedef unsigned long (_stdcall *w32_thread_start_func)(void*);
00273 #else
00274 #define start_thread CreateThread
00275 #define thread_errno rb_w32_map_errno(GetLastError())
00276 typedef LPTHREAD_START_ROUTINE w32_thread_start_func;
00277 #endif
00278 
00279 static HANDLE
00280 w32_create_thread(DWORD stack_size, w32_thread_start_func func, void *val)
00281 {
00282     return start_thread(0, stack_size, func, val, CREATE_SUSPENDED, 0);
00283 }
00284 
00285 int
00286 rb_w32_sleep(unsigned long msec)
00287 {
00288     return w32_wait_events(0, 0, msec, GET_THREAD());
00289 }
00290 
00291 int WINAPI
00292 rb_w32_Sleep(unsigned long msec)
00293 {
00294     int ret;
00295 
00296     BLOCKING_REGION(ret = rb_w32_sleep(msec),
00297                     ubf_handle, GET_THREAD());
00298     return ret;
00299 }
00300 
00301 static void
00302 native_sleep(rb_thread_t *th, struct timeval *tv)
00303 {
00304     DWORD msec;
00305 
00306     if (tv) {
00307         msec = tv->tv_sec * 1000 + tv->tv_usec / 1000;
00308     }
00309     else {
00310         msec = INFINITE;
00311     }
00312 
00313     GVL_UNLOCK_BEGIN();
00314     {
00315         DWORD ret;
00316 
00317         native_mutex_lock(&th->interrupt_lock);
00318         th->unblock.func = ubf_handle;
00319         th->unblock.arg = th;
00320         native_mutex_unlock(&th->interrupt_lock);
00321 
00322         if (RUBY_VM_INTERRUPTED(th)) {
00323             /* interrupted.  return immediate */
00324         }
00325         else {
00326             thread_debug("native_sleep start (%lu)\n", msec);
00327             ret = w32_wait_events(0, 0, msec, th);
00328             thread_debug("native_sleep done (%lu)\n", ret);
00329         }
00330 
00331         native_mutex_lock(&th->interrupt_lock);
00332         th->unblock.func = 0;
00333         th->unblock.arg = 0;
00334         native_mutex_unlock(&th->interrupt_lock);
00335     }
00336     GVL_UNLOCK_END();
00337 }
00338 
00339 static int
00340 native_mutex_lock(rb_thread_lock_t *lock)
00341 {
00342 #if USE_WIN32_MUTEX
00343     w32_mutex_lock(*lock);
00344 #else
00345     EnterCriticalSection(lock);
00346     return 0;
00347 #endif
00348 }
00349 
00350 static int
00351 native_mutex_unlock(rb_thread_lock_t *lock)
00352 {
00353 #if USE_WIN32_MUTEX
00354     thread_debug("release mutex: %p\n", *lock);
00355     return ReleaseMutex(*lock);
00356 #else
00357     LeaveCriticalSection(lock);
00358     return 0;
00359 #endif
00360 }
00361 
00362 static int
00363 native_mutex_trylock(rb_thread_lock_t *lock)
00364 {
00365 #if USE_WIN32_MUTEX
00366     int result;
00367     thread_debug("native_mutex_trylock: %p\n", *lock);
00368     result = w32_wait_events(&*lock, 1, 1, 0);
00369     thread_debug("native_mutex_trylock result: %d\n", result);
00370     switch (result) {
00371       case WAIT_OBJECT_0:
00372         return 0;
00373       case WAIT_TIMEOUT:
00374         return EBUSY;
00375     }
00376     return EINVAL;
00377 #else
00378     return TryEnterCriticalSection(lock) == 0;
00379 #endif
00380 }
00381 
00382 static void
00383 native_mutex_initialize(rb_thread_lock_t *lock)
00384 {
00385 #if USE_WIN32_MUTEX
00386     *lock = w32_mutex_create();
00387     /* thread_debug("initialize mutex: %p\n", *lock); */
00388 #else
00389     InitializeCriticalSection(lock);
00390 #endif
00391 }
00392 
00393 static void
00394 native_mutex_destroy(rb_thread_lock_t *lock)
00395 {
00396 #if USE_WIN32_MUTEX
00397     w32_close_handle(lock);
00398 #else
00399     DeleteCriticalSection(lock);
00400 #endif
00401 }
00402 
00403 struct cond_event_entry {
00404     struct cond_event_entry* next;
00405     struct cond_event_entry* prev;
00406     HANDLE event;
00407 };
00408 
00409 static void
00410 native_cond_signal(rb_thread_cond_t *cond)
00411 {
00412     /* cond is guarded by mutex */
00413     struct cond_event_entry *e = cond->next;
00414     struct cond_event_entry *head = (struct cond_event_entry*)cond;
00415 
00416     if (e != head) {
00417         struct cond_event_entry *next = e->next;
00418         struct cond_event_entry *prev = e->prev;
00419 
00420         prev->next = next;
00421         next->prev = prev;
00422         e->next = e->prev = e;
00423 
00424         SetEvent(e->event);
00425     }
00426 }
00427 
00428 static void
00429 native_cond_broadcast(rb_thread_cond_t *cond)
00430 {
00431     /* cond is guarded by mutex */
00432     struct cond_event_entry *e = cond->next;
00433     struct cond_event_entry *head = (struct cond_event_entry*)cond;
00434 
00435     while (e != head) {
00436         struct cond_event_entry *next = e->next;
00437         struct cond_event_entry *prev = e->prev;
00438 
00439         SetEvent(e->event);
00440 
00441         prev->next = next;
00442         next->prev = prev;
00443         e->next = e->prev = e;
00444 
00445         e = next;
00446     }
00447 }
00448 
00449 
00450 static int
00451 __cond_timedwait(rb_thread_cond_t *cond, rb_thread_lock_t *mutex, unsigned long msec)
00452 {
00453     DWORD r;
00454     struct cond_event_entry entry;
00455     struct cond_event_entry *head = (struct cond_event_entry*)cond;
00456 
00457     entry.event = CreateEvent(0, FALSE, FALSE, 0);
00458 
00459     /* cond is guarded by mutex */
00460     entry.next = head;
00461     entry.prev = head->prev;
00462     head->prev->next = &entry;
00463     head->prev = &entry;
00464 
00465     native_mutex_unlock(mutex);
00466     {
00467         r = WaitForSingleObject(entry.event, msec);
00468         if ((r != WAIT_OBJECT_0) && (r != WAIT_TIMEOUT)) {
00469             rb_bug("native_cond_wait: WaitForSingleObject returns %lu", r);
00470         }
00471     }
00472     native_mutex_lock(mutex);
00473 
00474     entry.prev->next = entry.next;
00475     entry.next->prev = entry.prev;
00476 
00477     w32_close_handle(entry.event);
00478     return (r == WAIT_OBJECT_0) ? 0 : ETIMEDOUT;
00479 }
00480 
00481 static int
00482 native_cond_wait(rb_thread_cond_t *cond, rb_thread_lock_t *mutex)
00483 {
00484     return __cond_timedwait(cond, mutex, INFINITE);
00485 }
00486 
00487 static unsigned long
00488 abs_timespec_to_timeout_ms(struct timespec *ts)
00489 {
00490     struct timeval tv;
00491     struct timeval now;
00492 
00493     gettimeofday(&now, NULL);
00494     tv.tv_sec = ts->tv_sec;
00495     tv.tv_usec = ts->tv_nsec / 1000;
00496 
00497     if (!rb_w32_time_subtract(&tv, &now))
00498         return 0;
00499 
00500     return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
00501 }
00502 
00503 static int
00504 native_cond_timedwait(rb_thread_cond_t *cond, rb_thread_lock_t *mutex, struct timespec *ts)
00505 {
00506     unsigned long timeout_ms;
00507 
00508     timeout_ms = abs_timespec_to_timeout_ms(ts);
00509     if (!timeout_ms)
00510         return ETIMEDOUT;
00511 
00512     return __cond_timedwait(cond, mutex, timeout_ms);
00513 }
00514 
00515 #if SIZEOF_TIME_T == SIZEOF_LONG
00516 typedef unsigned long unsigned_time_t;
00517 #elif SIZEOF_TIME_T == SIZEOF_INT
00518 typedef unsigned int unsigned_time_t;
00519 #elif SIZEOF_TIME_T == SIZEOF_LONG_LONG
00520 typedef unsigned LONG_LONG unsigned_time_t;
00521 #else
00522 # error cannot find integer type which size is same as time_t.
00523 #endif
00524 
00525 #define TIMET_MAX (~(time_t)0 <= 0 ? (time_t)((~(unsigned_time_t)0) >> 1) : (time_t)(~(unsigned_time_t)0))
00526 
00527 static struct timespec
00528 native_cond_timeout(rb_thread_cond_t *cond, struct timespec timeout_rel)
00529 {
00530     int ret;
00531     struct timeval tv;
00532     struct timespec timeout;
00533     struct timespec now;
00534 
00535     ret = gettimeofday(&tv, 0);
00536     if (ret != 0)
00537         rb_sys_fail(0);
00538     now.tv_sec = tv.tv_sec;
00539     now.tv_nsec = tv.tv_usec * 1000;
00540 
00541     timeout.tv_sec = now.tv_sec;
00542     timeout.tv_nsec = now.tv_nsec;
00543     timeout.tv_sec += timeout_rel.tv_sec;
00544     timeout.tv_nsec += timeout_rel.tv_nsec;
00545 
00546     if (timeout.tv_nsec >= 1000*1000*1000) {
00547         timeout.tv_sec++;
00548         timeout.tv_nsec -= 1000*1000*1000;
00549     }
00550 
00551     if (timeout.tv_sec < now.tv_sec)
00552         timeout.tv_sec = TIMET_MAX;
00553 
00554     return timeout;
00555 }
00556 
00557 static void
00558 native_cond_initialize(rb_thread_cond_t *cond, int flags)
00559 {
00560     cond->next = (struct cond_event_entry *)cond;
00561     cond->prev = (struct cond_event_entry *)cond;
00562 }
00563 
00564 static void
00565 native_cond_destroy(rb_thread_cond_t *cond)
00566 {
00567     /* */
00568 }
00569 
00570 void
00571 ruby_init_stack(volatile VALUE *addr)
00572 {
00573 }
00574 
00575 #define CHECK_ERR(expr) \
00576     {if (!(expr)) {rb_bug("err: %lu - %s", GetLastError(), #expr);}}
00577 
00578 static void
00579 native_thread_init_stack(rb_thread_t *th)
00580 {
00581     MEMORY_BASIC_INFORMATION mi;
00582     char *base, *end;
00583     DWORD size, space;
00584 
00585     CHECK_ERR(VirtualQuery(&mi, &mi, sizeof(mi)));
00586     base = mi.AllocationBase;
00587     end = mi.BaseAddress;
00588     end += mi.RegionSize;
00589     size = end - base;
00590     space = size / 5;
00591     if (space > 1024*1024) space = 1024*1024;
00592     th->machine_stack_start = (VALUE *)end - 1;
00593     th->machine_stack_maxsize = size - space;
00594 }
00595 
00596 #ifndef InterlockedExchangePointer
00597 #define InterlockedExchangePointer(t, v) \
00598     (void *)InterlockedExchange((long *)(t), (long)(v))
00599 #endif
00600 static void
00601 native_thread_destroy(rb_thread_t *th)
00602 {
00603     HANDLE intr = InterlockedExchangePointer(&th->native_thread_data.interrupt_event, 0);
00604     thread_debug("close handle - intr: %p, thid: %p\n", intr, th->thread_id);
00605     w32_close_handle(intr);
00606 }
00607 
00608 static unsigned long _stdcall
00609 thread_start_func_1(void *th_ptr)
00610 {
00611     rb_thread_t *th = th_ptr;
00612     volatile HANDLE thread_id = th->thread_id;
00613 
00614     native_thread_init_stack(th);
00615     th->native_thread_data.interrupt_event = CreateEvent(0, TRUE, FALSE, 0);
00616 
00617     /* run */
00618     thread_debug("thread created (th: %p, thid: %p, event: %p)\n", th,
00619                  th->thread_id, th->native_thread_data.interrupt_event);
00620 
00621     thread_start_func_2(th, th->machine_stack_start, rb_ia64_bsp());
00622 
00623     w32_close_handle(thread_id);
00624     thread_debug("thread deleted (th: %p)\n", th);
00625     return 0;
00626 }
00627 
00628 static int
00629 native_thread_create(rb_thread_t *th)
00630 {
00631     size_t stack_size = 4 * 1024; /* 4KB */
00632     th->thread_id = w32_create_thread(stack_size, thread_start_func_1, th);
00633 
00634     if ((th->thread_id) == 0) {
00635         return thread_errno;
00636     }
00637 
00638     w32_resume_thread(th->thread_id);
00639 
00640     if (THREAD_DEBUG) {
00641         Sleep(0);
00642         thread_debug("create: (th: %p, thid: %p, intr: %p), stack size: %"PRIdSIZE"\n",
00643                      th, th->thread_id,
00644                      th->native_thread_data.interrupt_event, stack_size);
00645     }
00646     return 0;
00647 }
00648 
00649 static void
00650 native_thread_join(HANDLE th)
00651 {
00652     w32_wait_events(&th, 1, INFINITE, 0);
00653 }
00654 
00655 #if USE_NATIVE_THREAD_PRIORITY
00656 
00657 static void
00658 native_thread_apply_priority(rb_thread_t *th)
00659 {
00660     int priority = th->priority;
00661     if (th->priority > 0) {
00662         priority = THREAD_PRIORITY_ABOVE_NORMAL;
00663     }
00664     else if (th->priority < 0) {
00665         priority = THREAD_PRIORITY_BELOW_NORMAL;
00666     }
00667     else {
00668         priority = THREAD_PRIORITY_NORMAL;
00669     }
00670 
00671     SetThreadPriority(th->thread_id, priority);
00672 }
00673 
00674 #endif /* USE_NATIVE_THREAD_PRIORITY */
00675 
00676 int rb_w32_select_with_thread(int, fd_set *, fd_set *, fd_set *, struct timeval *, void *);     /* @internal */
00677 
00678 static int
00679 native_fd_select(int n, rb_fdset_t *readfds, rb_fdset_t *writefds, rb_fdset_t *exceptfds, struct timeval *timeout, rb_thread_t *th)
00680 {
00681     fd_set *r = NULL, *w = NULL, *e = NULL;
00682     if (readfds) {
00683         rb_fd_resize(n - 1, readfds);
00684         r = rb_fd_ptr(readfds);
00685     }
00686     if (writefds) {
00687         rb_fd_resize(n - 1, writefds);
00688         w = rb_fd_ptr(writefds);
00689     }
00690     if (exceptfds) {
00691         rb_fd_resize(n - 1, exceptfds);
00692         e = rb_fd_ptr(exceptfds);
00693     }
00694     return rb_w32_select_with_thread(n, r, w, e, timeout, th);
00695 }
00696 
00697 /* @internal */
00698 int
00699 rb_w32_check_interrupt(rb_thread_t *th)
00700 {
00701     return w32_wait_events(0, 0, 0, th);
00702 }
00703 
00704 static void
00705 ubf_handle(void *ptr)
00706 {
00707     rb_thread_t *th = (rb_thread_t *)ptr;
00708     thread_debug("ubf_handle: %p\n", th);
00709 
00710     w32_set_event(th->native_thread_data.interrupt_event);
00711 }
00712 
00713 static HANDLE timer_thread_id = 0;
00714 static HANDLE timer_thread_lock;
00715 
00716 static unsigned long _stdcall
00717 timer_thread_func(void *dummy)
00718 {
00719     thread_debug("timer_thread\n");
00720     while (WaitForSingleObject(timer_thread_lock, TIME_QUANTUM_USEC/1000) ==
00721            WAIT_TIMEOUT) {
00722         timer_thread_function(dummy);
00723     }
00724     thread_debug("timer killed\n");
00725     return 0;
00726 }
00727 
00728 void
00729 rb_thread_wakeup_timer_thread(void)
00730 {
00731     /* do nothing */
00732 }
00733 
00734 static void
00735 rb_thread_create_timer_thread(void)
00736 {
00737     if (timer_thread_id == 0) {
00738         if (!timer_thread_lock) {
00739             timer_thread_lock = CreateEvent(0, TRUE, FALSE, 0);
00740         }
00741         timer_thread_id = w32_create_thread(1024 + (THREAD_DEBUG ? BUFSIZ : 0),
00742                                             timer_thread_func, 0);
00743         w32_resume_thread(timer_thread_id);
00744     }
00745 }
00746 
00747 static int
00748 native_stop_timer_thread(int close_anyway)
00749 {
00750     int stopped = --system_working <= 0;
00751     if (stopped) {
00752         SetEvent(timer_thread_lock);
00753         native_thread_join(timer_thread_id);
00754         CloseHandle(timer_thread_lock);
00755         timer_thread_lock = 0;
00756     }
00757     return stopped;
00758 }
00759 
00760 static void
00761 native_reset_timer_thread(void)
00762 {
00763     if (timer_thread_id) {
00764         CloseHandle(timer_thread_id);
00765         timer_thread_id = 0;
00766     }
00767 }
00768 
00769 #ifdef RUBY_ALLOCA_CHKSTK
00770 void
00771 ruby_alloca_chkstk(size_t len, void *sp)
00772 {
00773     if (ruby_stack_length(NULL) * sizeof(VALUE) >= len) {
00774         rb_thread_t *th = GET_THREAD();
00775         if (!rb_thread_raised_p(th, RAISED_STACKOVERFLOW)) {
00776             rb_thread_raised_set(th, RAISED_STACKOVERFLOW);
00777             rb_exc_raise(sysstack_error);
00778         }
00779     }
00780 }
00781 #endif
00782 int
00783 rb_reserved_fd_p(int fd)
00784 {
00785     return 0;
00786 }
00787 #endif /* THREAD_SYSTEM_DEPENDENT_IMPLEMENTATION */
00788