static void
gvl_yield(rb_vm_t *vm, rb_thread_t *th)
{
native_mutex_lock(&vm->gvl.lock);
gvl_release_common(vm);
/* An another thread is processing GVL yield. */
if (UNLIKELY(vm->gvl.wait_yield)) {
while (vm->gvl.wait_yield)
native_cond_wait(&vm->gvl.switch_wait_cond, &vm->gvl.lock);
goto acquire;
}
if (vm->gvl.waiting > 0) {
/* Wait until another thread task take GVL. */
vm->gvl.need_yield = 1;
vm->gvl.wait_yield = 1;
while (vm->gvl.need_yield)
native_cond_wait(&vm->gvl.switch_cond, &vm->gvl.lock);
vm->gvl.wait_yield = 0;
}
else {
native_mutex_unlock(&vm->gvl.lock);
sched_yield();
native_mutex_lock(&vm->gvl.lock);
}
native_cond_broadcast(&vm->gvl.switch_wait_cond);
acquire:
gvl_acquire_common(vm);
native_mutex_unlock(&vm->gvl.lock);
}
static void
gvl_acquire_common(rb_vm_t *vm)
{
if (vm->gvl.acquired) {
vm->gvl.waiting++;
if (vm->gvl.waiting == 1) {
/*
* Wake up timer thread iff timer thread is slept.
* When timer thread is polling mode, we don't want to
* make confusing timer thread interval time.
*/
rb_thread_wakeup_timer_thread_low();
}
while (vm->gvl.acquired) {
native_cond_wait(&vm->gvl.cond, &vm->gvl.lock);
}
vm->gvl.waiting--;
if (vm->gvl.need_yield) {
vm->gvl.need_yield = 0;
native_cond_signal(&vm->gvl.switch_cond);
}
}
vm->gvl.acquired = 1;
}
static void
gvl_acquire_common(rb_vm_t *vm)
{
if (vm->gvl.acquired) {
vm->gvl.waiting++;
if (vm->gvl.waiting == 1) {
/* transit to polling mode */
rb_thread_wakeup_timer_thread();
}
while (vm->gvl.acquired) {
native_cond_wait(&vm->gvl.cond, &vm->gvl.lock);
}
vm->gvl.waiting--;
if (vm->gvl.need_yield) {
vm->gvl.need_yield = 0;
native_cond_signal(&vm->gvl.switch_cond);
}
}
vm->gvl.acquired = 1;
}
static void
gvl_acquire(rb_vm_t *vm, rb_thread_t *th)
{
#if GVL_SIMPLE_LOCK
native_mutex_lock(&vm->gvl.lock);
#else
native_mutex_lock(&vm->gvl.lock);
if (vm->gvl.waiting > 0 || vm->gvl.acquired != 0) {
if (GVL_DEBUG) fprintf(stderr, "gvl acquire (%p): sleep\n", th);
gvl_waiting_push(vm, th);
if (GVL_DEBUG) gvl_show_waiting_threads(vm);
while (vm->gvl.acquired != 0 || vm->gvl.waiting_threads != th) {
native_cond_wait(&th->native_thread_data.gvl_cond, &vm->gvl.lock);
}
gvl_waiting_shift(vm, th);
}
else {
/* do nothing */
}
vm->gvl.acquired = 1;
native_mutex_unlock(&vm->gvl.lock);
#endif
if (GVL_DEBUG) gvl_show_waiting_threads(vm);
if (GVL_DEBUG) fprintf(stderr, "gvl acquire (%p): acquire\n", th);
}
int rw_pr_wrlock(rw_pr_lock_t *rwlock)
{
native_mutex_lock(&rwlock->lock);
if (rwlock->active_readers != 0)
{
/* There are active readers. We have to wait until they are gone. */
rwlock->writers_waiting_readers++;
while (rwlock->active_readers != 0)
native_cond_wait(&rwlock->no_active_readers, &rwlock->lock);
rwlock->writers_waiting_readers--;
}
/*
We own 'lock' mutex so there is no active writers.
Also there are no active readers.
This means that we can grant wr-lock.
Not releasing 'lock' mutex until unlock will block
both requests for rd and wr-locks.
Set 'active_writer' flag to simplify unlock.
Thanks to the fact wr-lock/unlock in the absence of
contention from readers is essentially mutex lock/unlock
with a few simple checks make this rwlock implementation
wr-lock optimized.
*/
rwlock->active_writer= TRUE;
#ifdef SAFE_MUTEX
rwlock->writer_thread= pthread_self();
#endif
return 0;
}
static void
native_sleep(rb_thread_t *th, struct timeval *timeout_tv)
{
struct timespec timeout;
rb_nativethread_lock_t *lock = &th->interrupt_lock;
rb_nativethread_cond_t *cond = &th->native_thread_data.sleep_cond;
if (timeout_tv) {
struct timespec timeout_rel;
timeout_rel.tv_sec = timeout_tv->tv_sec;
timeout_rel.tv_nsec = timeout_tv->tv_usec * 1000;
/* Solaris cond_timedwait() return EINVAL if an argument is greater than
* current_time + 100,000,000. So cut up to 100,000,000. This is
* considered as a kind of spurious wakeup. The caller to native_sleep
* should care about spurious wakeup.
*
* See also [Bug #1341] [ruby-core:29702]
* http://download.oracle.com/docs/cd/E19683-01/816-0216/6m6ngupgv/index.html
*/
if (timeout_rel.tv_sec > 100000000) {
timeout_rel.tv_sec = 100000000;
timeout_rel.tv_nsec = 0;
}
timeout = native_cond_timeout(cond, timeout_rel);
}
GVL_UNLOCK_BEGIN();
{
native_mutex_lock(lock);
th->unblock.func = ubf_pthread_cond_signal;
th->unblock.arg = th;
if (RUBY_VM_INTERRUPTED(th)) {
/* interrupted. return immediate */
thread_debug("native_sleep: interrupted before sleep\n");
}
else {
if (!timeout_tv)
native_cond_wait(cond, lock);
else
native_cond_timedwait(cond, lock, &timeout);
}
th->unblock.func = 0;
th->unblock.arg = 0;
native_mutex_unlock(lock);
}
GVL_UNLOCK_END();
thread_debug("native_sleep done\n");
}
int
NdbCondition_Wait(struct NdbCondition* p_cond,
NdbMutex* p_mutex)
{
int result;
if (p_cond == NULL || p_mutex == NULL)
return 1;
#ifdef NDB_MUTEX_STRUCT
result = pthread_cond_wait(&p_cond->cond, &p_mutex->mutex);
#else
result = native_cond_wait(&p_cond->cond, p_mutex);
#endif
return result;
}
static void
native_sleep(rb_thread_t *th, struct timeval *timeout_tv)
{
struct timespec timeout;
struct timeval tvn;
pthread_mutex_t *lock = &th->interrupt_lock;
rb_thread_cond_t *cond = &th->native_thread_data.sleep_cond;
if (timeout_tv) {
struct timespec timeout_rel;
timeout_rel.tv_sec = timeout_tv->tv_sec;
timeout_rel.tv_nsec = timeout_tv->tv_usec;
timeout = native_cond_timeout(cond, timeout_rel);
}
GVL_UNLOCK_BEGIN();
{
pthread_mutex_lock(lock);
th->unblock.func = ubf_pthread_cond_signal;
th->unblock.arg = th;
if (RUBY_VM_INTERRUPTED(th)) {
/* interrupted. return immediate */
thread_debug("native_sleep: interrupted before sleep\n");
}
else {
if (!timeout_tv)
native_cond_wait(cond, lock);
else
native_cond_timedwait(cond, lock, &timeout);
}
th->unblock.func = 0;
th->unblock.arg = 0;
pthread_mutex_unlock(lock);
}
GVL_UNLOCK_END();
thread_debug("native_sleep done\n");
}
static int
lock_func(rb_thread_t *th, rb_mutex_t *mutex, int timeout_ms)
{
int interrupted = 0;
int err = 0;
mutex->cond_waiting++;
for (;;) {
if (!mutex->th) {
mutex->th = th;
break;
}
if (RUBY_VM_INTERRUPTED(th)) {
interrupted = 1;
break;
}
if (err == ETIMEDOUT) {
interrupted = 2;
break;
}
if (timeout_ms) {
struct timespec timeout_rel;
struct timespec timeout;
timeout_rel.tv_sec = 0;
timeout_rel.tv_nsec = timeout_ms * 1000 * 1000;
timeout = native_cond_timeout(&mutex->cond, timeout_rel);
err = native_cond_timedwait(&mutex->cond, &mutex->lock, &timeout);
}
else {
native_cond_wait(&mutex->cond, &mutex->lock);
err = 0;
}
}
mutex->cond_waiting--;
return interrupted;
}
