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/* -*-c-*- */
/**********************************************************************
thread_win32.c -
$Author: ko1 $
Copyright (C) 2004-2007 Koichi Sasada
**********************************************************************/
#ifdef THREAD_SYSTEM_DEPENDENT_IMPLEMENTATION
#include <process.h>
#define TIME_QUANTUM_USEC (100 * 1000)
#define RB_CONDATTR_CLOCK_MONOTONIC 1 /* no effect */
#undef Sleep
#define native_thread_yield() Sleep(0)
#define remove_signal_thread_list(th)
static volatile DWORD ruby_native_thread_key = TLS_OUT_OF_INDEXES;
static int w32_wait_events(HANDLE *events, int count, DWORD timeout, rb_thread_t *th);
static int native_mutex_lock(rb_thread_lock_t *lock);
static int native_mutex_unlock(rb_thread_lock_t *lock);
static void
w32_error(const char *func)
{
LPVOID lpMsgBuf;
DWORD err = GetLastError();
if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
err,
MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
(LPTSTR) & lpMsgBuf, 0, NULL) == 0)
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
err,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) & lpMsgBuf, 0, NULL);
rb_bug("%s: %s", func, (char*)lpMsgBuf);
}
static int
w32_mutex_lock(HANDLE lock)
{
DWORD result;
while (1) {
thread_debug("native_mutex_lock: %p\n", lock);
result = w32_wait_events(&lock, 1, INFINITE, 0);
switch (result) {
case WAIT_OBJECT_0:
/* get mutex object */
thread_debug("acquire mutex: %p\n", lock);
return 0;
case WAIT_OBJECT_0 + 1:
/* interrupt */
errno = EINTR;
thread_debug("acquire mutex interrupted: %p\n", lock);
return 0;
case WAIT_TIMEOUT:
thread_debug("timeout mutex: %p\n", lock);
break;
case WAIT_ABANDONED:
rb_bug("win32_mutex_lock: WAIT_ABANDONED");
break;
default:
rb_bug("win32_mutex_lock: unknown result (%ld)", result);
break;
}
}
return 0;
}
static HANDLE
w32_mutex_create(void)
{
HANDLE lock = CreateMutex(NULL, FALSE, NULL);
if (lock == NULL) {
w32_error("native_mutex_initialize");
}
return lock;
}
#define GVL_DEBUG 0
static void
gvl_acquire(rb_vm_t *vm, rb_thread_t *th)
{
w32_mutex_lock(vm->gvl.lock);
if (GVL_DEBUG) fprintf(stderr, "gvl acquire (%p): acquire\n", th);
}
static void
gvl_release(rb_vm_t *vm)
{
ReleaseMutex(vm->gvl.lock);
}
static void
gvl_yield(rb_vm_t *vm, rb_thread_t *th)
{
gvl_release(th->vm);
native_thread_yield();
gvl_acquire(vm, th);
}
static void
gvl_atfork(rb_vm_t *vm)
{
rb_bug("gvl_atfork() is called on win32");
}
static void
gvl_init(rb_vm_t *vm)
{
if (GVL_DEBUG) fprintf(stderr, "gvl init\n");
vm->gvl.lock = w32_mutex_create();
}
static void
gvl_destroy(rb_vm_t *vm)
{
if (GVL_DEBUG) fprintf(stderr, "gvl destroy\n");
CloseHandle(vm->gvl.lock);
}
static rb_thread_t *
ruby_thread_from_native(void)
{
return TlsGetValue(ruby_native_thread_key);
}
static int
ruby_thread_set_native(rb_thread_t *th)
{
return TlsSetValue(ruby_native_thread_key, th);
}
void
Init_native_thread(void)
{
rb_thread_t *th = GET_THREAD();
ruby_native_thread_key = TlsAlloc();
ruby_thread_set_native(th);
DuplicateHandle(GetCurrentProcess(),
GetCurrentThread(),
GetCurrentProcess(),
&th->thread_id, 0, FALSE, DUPLICATE_SAME_ACCESS);
th->native_thread_data.interrupt_event = CreateEvent(0, TRUE, FALSE, 0);
thread_debug("initial thread (th: %p, thid: %p, event: %p)\n",
th, GET_THREAD()->thread_id,
th->native_thread_data.interrupt_event);
}
static void
w32_set_event(HANDLE handle)
{
if (SetEvent(handle) == 0) {
w32_error("w32_set_event");
}
}
static void
w32_reset_event(HANDLE handle)
{
if (ResetEvent(handle) == 0) {
w32_error("w32_reset_event");
}
}
static int
w32_wait_events(HANDLE *events, int count, DWORD timeout, rb_thread_t *th)
{
HANDLE *targets = events;
HANDLE intr;
DWORD ret;
thread_debug(" w32_wait_events events:%p, count:%d, timeout:%ld, th:%p\n",
events, count, timeout, th);
if (th && (intr = th->native_thread_data.interrupt_event)) {
gvl_acquire(th->vm, th);
if (intr == th->native_thread_data.interrupt_event) {
w32_reset_event(intr);
if (RUBY_VM_INTERRUPTED(th)) {
w32_set_event(intr);
}
targets = ALLOCA_N(HANDLE, count + 1);
memcpy(targets, events, sizeof(HANDLE) * count);
targets[count++] = intr;
thread_debug(" * handle: %p (count: %d, intr)\n", intr, count);
}
gvl_release(th->vm);
}
thread_debug(" WaitForMultipleObjects start (count: %d)\n", count);
ret = WaitForMultipleObjects(count, targets, FALSE, timeout);
thread_debug(" WaitForMultipleObjects end (ret: %lu)\n", ret);
if (ret == (DWORD)(WAIT_OBJECT_0 + count - 1) && th) {
errno = EINTR;
}
if (ret == WAIT_FAILED && THREAD_DEBUG) {
int i;
DWORD dmy;
for (i = 0; i < count; i++) {
thread_debug(" * error handle %d - %s\n", i,
GetHandleInformation(targets[i], &dmy) ? "OK" : "NG");
}
}
return ret;
}
static void ubf_handle(void *ptr);
#define ubf_select ubf_handle
int
rb_w32_wait_events_blocking(HANDLE *events, int num, DWORD timeout)
{
return w32_wait_events(events, num, timeout, GET_THREAD());
}
int
rb_w32_wait_events(HANDLE *events, int num, DWORD timeout)
{
int ret;
BLOCKING_REGION(ret = rb_w32_wait_events_blocking(events, num, timeout),
ubf_handle, GET_THREAD());
return ret;
}
static void
w32_close_handle(HANDLE handle)
{
if (CloseHandle(handle) == 0) {
w32_error("w32_close_handle");
}
}
static void
w32_resume_thread(HANDLE handle)
{
if (ResumeThread(handle) == (DWORD)-1) {
w32_error("w32_resume_thread");
}
}
#ifdef _MSC_VER
#define HAVE__BEGINTHREADEX 1
#else
#undef HAVE__BEGINTHREADEX
#endif
#ifdef HAVE__BEGINTHREADEX
#define start_thread (HANDLE)_beginthreadex
#define thread_errno errno
typedef unsigned long (_stdcall *w32_thread_start_func)(void*);
#else
#define start_thread CreateThread
#define thread_errno rb_w32_map_errno(GetLastError())
typedef LPTHREAD_START_ROUTINE w32_thread_start_func;
#endif
static HANDLE
w32_create_thread(DWORD stack_size, w32_thread_start_func func, void *val)
{
return start_thread(0, stack_size, func, val, CREATE_SUSPENDED, 0);
}
int
rb_w32_sleep(unsigned long msec)
{
return w32_wait_events(0, 0, msec, GET_THREAD());
}
int WINAPI
rb_w32_Sleep(unsigned long msec)
{
int ret;
BLOCKING_REGION(ret = rb_w32_sleep(msec),
ubf_handle, GET_THREAD());
return ret;
}
static void
native_sleep(rb_thread_t *th, struct timeval *tv)
{
DWORD msec;
if (tv) {
msec = tv->tv_sec * 1000 + tv->tv_usec / 1000;
}
else {
msec = INFINITE;
}
GVL_UNLOCK_BEGIN();
{
DWORD ret;
native_mutex_lock(&th->interrupt_lock);
th->unblock.func = ubf_handle;
th->unblock.arg = th;
native_mutex_unlock(&th->interrupt_lock);
if (RUBY_VM_INTERRUPTED(th)) {
/* interrupted. return immediate */
}
else {
thread_debug("native_sleep start (%lu)\n", msec);
ret = w32_wait_events(0, 0, msec, th);
thread_debug("native_sleep done (%lu)\n", ret);
}
native_mutex_lock(&th->interrupt_lock);
th->unblock.func = 0;
th->unblock.arg = 0;
native_mutex_unlock(&th->interrupt_lock);
}
GVL_UNLOCK_END();
}
static int
native_mutex_lock(rb_thread_lock_t *lock)
{
#if USE_WIN32_MUTEX
w32_mutex_lock(*lock);
#else
EnterCriticalSection(lock);
return 0;
#endif
}
static int
native_mutex_unlock(rb_thread_lock_t *lock)
{
#if USE_WIN32_MUTEX
thread_debug("release mutex: %p\n", *lock);
return ReleaseMutex(*lock);
#else
LeaveCriticalSection(lock);
return 0;
#endif
}
static int
native_mutex_trylock(rb_thread_lock_t *lock)
{
#if USE_WIN32_MUTEX
int result;
thread_debug("native_mutex_trylock: %p\n", *lock);
result = w32_wait_events(&*lock, 1, 1, 0);
thread_debug("native_mutex_trylock result: %d\n", result);
switch (result) {
case WAIT_OBJECT_0:
return 0;
case WAIT_TIMEOUT:
return EBUSY;
}
return EINVAL;
#else
return TryEnterCriticalSection(lock) == 0;
#endif
}
static void
native_mutex_initialize(rb_thread_lock_t *lock)
{
#if USE_WIN32_MUTEX
*lock = w32_mutex_create();
/* thread_debug("initialize mutex: %p\n", *lock); */
#else
InitializeCriticalSection(lock);
#endif
}
static void
native_mutex_destroy(rb_thread_lock_t *lock)
{
#if USE_WIN32_MUTEX
w32_close_handle(lock);
#else
DeleteCriticalSection(lock);
#endif
}
struct cond_event_entry {
struct cond_event_entry* next;
struct cond_event_entry* prev;
HANDLE event;
};
static void
native_cond_signal(rb_thread_cond_t *cond)
{
/* cond is guarded by mutex */
struct cond_event_entry *e = cond->next;
struct cond_event_entry *head = (struct cond_event_entry*)cond;
if (e != head) {
struct cond_event_entry *next = e->next;
struct cond_event_entry *prev = e->prev;
prev->next = next;
next->prev = prev;
e->next = e->prev = e;
SetEvent(e->event);
}
}
static void
native_cond_broadcast(rb_thread_cond_t *cond)
{
/* cond is guarded by mutex */
struct cond_event_entry *e = cond->next;
struct cond_event_entry *head = (struct cond_event_entry*)cond;
while (e != head) {
struct cond_event_entry *next = e->next;
struct cond_event_entry *prev = e->prev;
SetEvent(e->event);
prev->next = next;
next->prev = prev;
e->next = e->prev = e;
e = next;
}
}
static int
__cond_timedwait(rb_thread_cond_t *cond, rb_thread_lock_t *mutex, unsigned long msec)
{
DWORD r;
struct cond_event_entry entry;
struct cond_event_entry *head = (struct cond_event_entry*)cond;
entry.event = CreateEvent(0, FALSE, FALSE, 0);
/* cond is guarded by mutex */
entry.next = head;
entry.prev = head->prev;
head->prev->next = &entry;
head->prev = &entry;
native_mutex_unlock(mutex);
{
r = WaitForSingleObject(entry.event, msec);
if ((r != WAIT_OBJECT_0) && (r != WAIT_TIMEOUT)) {
rb_bug("native_cond_wait: WaitForSingleObject returns %lu", r);
}
}
native_mutex_lock(mutex);
entry.prev->next = entry.next;
entry.next->prev = entry.prev;
w32_close_handle(entry.event);
return (r == WAIT_OBJECT_0) ? 0 : ETIMEDOUT;
}
static int
native_cond_wait(rb_thread_cond_t *cond, rb_thread_lock_t *mutex)
{
return __cond_timedwait(cond, mutex, INFINITE);
}
static unsigned long
abs_timespec_to_timeout_ms(struct timespec *ts)
{
struct timeval tv;
struct timeval now;
gettimeofday(&now, NULL);
tv.tv_sec = ts->tv_sec;
tv.tv_usec = ts->tv_nsec / 1000;
if (!rb_w32_time_subtract(&tv, &now))
return 0;
return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
}
static int
native_cond_timedwait(rb_thread_cond_t *cond, rb_thread_lock_t *mutex, struct timespec *ts)
{
unsigned long timeout_ms;
timeout_ms = abs_timespec_to_timeout_ms(ts);
if (!timeout_ms)
return ETIMEDOUT;
return __cond_timedwait(cond, mutex, timeout_ms);
}
#if SIZEOF_TIME_T == SIZEOF_LONG
typedef unsigned long unsigned_time_t;
#elif SIZEOF_TIME_T == SIZEOF_INT
typedef unsigned int unsigned_time_t;
#elif SIZEOF_TIME_T == SIZEOF_LONG_LONG
typedef unsigned LONG_LONG unsigned_time_t;
#else
# error cannot find integer type which size is same as time_t.
#endif
#define TIMET_MAX (~(time_t)0 <= 0 ? (time_t)((~(unsigned_time_t)0) >> 1) : (time_t)(~(unsigned_time_t)0))
static struct timespec
native_cond_timeout(rb_thread_cond_t *cond, struct timespec timeout_rel)
{
int ret;
struct timeval tv;
struct timespec timeout;
struct timespec now;
ret = gettimeofday(&tv, 0);
if (ret != 0)
rb_sys_fail(0);
now.tv_sec = tv.tv_sec;
now.tv_nsec = tv.tv_usec * 1000;
timeout.tv_sec = now.tv_sec;
timeout.tv_nsec = now.tv_nsec;
timeout.tv_sec += timeout_rel.tv_sec;
timeout.tv_nsec += timeout_rel.tv_nsec;
if (timeout.tv_nsec >= 1000*1000*1000) {
timeout.tv_sec++;
timeout.tv_nsec -= 1000*1000*1000;
}
if (timeout.tv_sec < now.tv_sec)
timeout.tv_sec = TIMET_MAX;
return timeout;
}
static void
native_cond_initialize(rb_thread_cond_t *cond, int flags)
{
cond->next = (struct cond_event_entry *)cond;
cond->prev = (struct cond_event_entry *)cond;
}
static void
native_cond_destroy(rb_thread_cond_t *cond)
{
/* */
}
void
ruby_init_stack(volatile VALUE *addr)
{
}
#define CHECK_ERR(expr) \
{if (!(expr)) {rb_bug("err: %lu - %s", GetLastError(), #expr);}}
static void
native_thread_init_stack(rb_thread_t *th)
{
MEMORY_BASIC_INFORMATION mi;
char *base, *end;
DWORD size, space;
CHECK_ERR(VirtualQuery(&mi, &mi, sizeof(mi)));
base = mi.AllocationBase;
end = mi.BaseAddress;
end += mi.RegionSize;
size = end - base;
space = size / 5;
if (space > 1024*1024) space = 1024*1024;
th->machine_stack_start = (VALUE *)end - 1;
th->machine_stack_maxsize = size - space;
}
#ifndef InterlockedExchangePointer
#define InterlockedExchangePointer(t, v) \
(void *)InterlockedExchange((long *)(t), (long)(v))
#endif
static void
native_thread_destroy(rb_thread_t *th)
{
HANDLE intr = InterlockedExchangePointer(&th->native_thread_data.interrupt_event, 0);
thread_debug("close handle - intr: %p, thid: %p\n", intr, th->thread_id);
w32_close_handle(intr);
}
static unsigned long _stdcall
thread_start_func_1(void *th_ptr)
{
rb_thread_t *th = th_ptr;
volatile HANDLE thread_id = th->thread_id;
native_thread_init_stack(th);
th->native_thread_data.interrupt_event = CreateEvent(0, TRUE, FALSE, 0);
/* run */
thread_debug("thread created (th: %p, thid: %p, event: %p)\n", th,
th->thread_id, th->native_thread_data.interrupt_event);
thread_start_func_2(th, th->machine_stack_start, rb_ia64_bsp());
w32_close_handle(thread_id);
thread_debug("thread deleted (th: %p)\n", th);
return 0;
}
static int
native_thread_create(rb_thread_t *th)
{
size_t stack_size = 4 * 1024; /* 4KB */
th->thread_id = w32_create_thread(stack_size, thread_start_func_1, th);
if ((th->thread_id) == 0) {
return thread_errno;
}
w32_resume_thread(th->thread_id);
if (THREAD_DEBUG) {
Sleep(0);
thread_debug("create: (th: %p, thid: %p, intr: %p), stack size: %"PRIdSIZE"\n",
th, th->thread_id,
th->native_thread_data.interrupt_event, stack_size);
}
return 0;
}
static void
native_thread_join(HANDLE th)
{
w32_wait_events(&th, 1, INFINITE, 0);
}
#if USE_NATIVE_THREAD_PRIORITY
static void
native_thread_apply_priority(rb_thread_t *th)
{
int priority = th->priority;
if (th->priority > 0) {
priority = THREAD_PRIORITY_ABOVE_NORMAL;
}
else if (th->priority < 0) {
priority = THREAD_PRIORITY_BELOW_NORMAL;
}
else {
priority = THREAD_PRIORITY_NORMAL;
}
SetThreadPriority(th->thread_id, priority);
}
#endif /* USE_NATIVE_THREAD_PRIORITY */
int rb_w32_select_with_thread(int, fd_set *, fd_set *, fd_set *, struct timeval *, void *); /* @internal */
static int
native_fd_select(int n, rb_fdset_t *readfds, rb_fdset_t *writefds, rb_fdset_t *exceptfds, struct timeval *timeout, rb_thread_t *th)
{
fd_set *r = NULL, *w = NULL, *e = NULL;
if (readfds) {
rb_fd_resize(n - 1, readfds);
r = rb_fd_ptr(readfds);
}
if (writefds) {
rb_fd_resize(n - 1, writefds);
w = rb_fd_ptr(writefds);
}
if (exceptfds) {
rb_fd_resize(n - 1, exceptfds);
e = rb_fd_ptr(exceptfds);
}
return rb_w32_select_with_thread(n, r, w, e, timeout, th);
}
/* @internal */
int
rb_w32_check_interrupt(rb_thread_t *th)
{
return w32_wait_events(0, 0, 0, th);
}
static void
ubf_handle(void *ptr)
{
rb_thread_t *th = (rb_thread_t *)ptr;
thread_debug("ubf_handle: %p\n", th);
w32_set_event(th->native_thread_data.interrupt_event);
}
static HANDLE timer_thread_id = 0;
static HANDLE timer_thread_lock;
static unsigned long _stdcall
timer_thread_func(void *dummy)
{
thread_debug("timer_thread\n");
while (WaitForSingleObject(timer_thread_lock, TIME_QUANTUM_USEC/1000) ==
WAIT_TIMEOUT) {
timer_thread_function(dummy);
}
thread_debug("timer killed\n");
return 0;
}
void
rb_thread_wakeup_timer_thread(void)
{
/* do nothing */
}
static void
rb_thread_create_timer_thread(void)
{
if (timer_thread_id == 0) {
if (!timer_thread_lock) {
timer_thread_lock = CreateEvent(0, TRUE, FALSE, 0);
}
timer_thread_id = w32_create_thread(1024 + (THREAD_DEBUG ? BUFSIZ : 0),
timer_thread_func, 0);
w32_resume_thread(timer_thread_id);
}
}
static int
native_stop_timer_thread(int close_anyway)
{
int stopped = --system_working <= 0;
if (stopped) {
SetEvent(timer_thread_lock);
native_thread_join(timer_thread_id);
CloseHandle(timer_thread_lock);
timer_thread_lock = 0;
}
return stopped;
}
static void
native_reset_timer_thread(void)
{
if (timer_thread_id) {
CloseHandle(timer_thread_id);
timer_thread_id = 0;
}
}
#ifdef RUBY_ALLOCA_CHKSTK
void
ruby_alloca_chkstk(size_t len, void *sp)
{
if (ruby_stack_length(NULL) * sizeof(VALUE) >= len) {
rb_thread_t *th = GET_THREAD();
if (!rb_thread_raised_p(th, RAISED_STACKOVERFLOW)) {
rb_thread_raised_set(th, RAISED_STACKOVERFLOW);
rb_exc_raise(sysstack_error);
}
}
}
#endif
int
rb_reserved_fd_p(int fd)
{
return 0;
}
#endif /* THREAD_SYSTEM_DEPENDENT_IMPLEMENTATION */
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