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#include "vm_core.h"
#include "vm_sync.h"
#include "ractor.h"
#include "vm_debug.h"
#include "gc.h"
static bool vm_barrier_finish_p(rb_vm_t *vm);
static bool
vm_locked(rb_vm_t *vm)
{
return vm->ractor.sync.lock_owner == GET_RACTOR();
}
#if RUBY_DEBUG > 0
void
ASSERT_vm_locking(void)
{
if (rb_multi_ractor_p()) {
rb_vm_t *vm = GET_VM();
VM_ASSERT(vm_locked(vm));
}
}
void
ASSERT_vm_unlocking(void)
{
if (rb_multi_ractor_p()) {
rb_vm_t *vm = GET_VM();
VM_ASSERT(!vm_locked(vm));
}
}
#endif
bool
rb_vm_locked_p(void)
{
return vm_locked(GET_VM());
}
static void
vm_lock_enter(rb_vm_t *vm, bool locked, unsigned int *lev APPEND_LOCATION_ARGS)
{
if (locked) {
ASSERT_vm_locking();
}
else {
rb_ractor_t *cr = GET_RACTOR();
#if RACTOR_CHECK_MODE
// locking ractor and acquire VM lock will cause deadlock
VM_ASSERT(cr->locked_by != cr->self);
#endif
// lock
rb_native_mutex_lock(&vm->ractor.sync.lock);
VM_ASSERT(vm->ractor.sync.lock_owner == NULL);
vm->ractor.sync.lock_owner = cr;
// barrier
while (vm->ractor.sync.barrier_waiting) {
unsigned int barrier_cnt = vm->ractor.sync.barrier_cnt;
rb_thread_t *th = GET_THREAD();
bool running;
RB_GC_SAVE_MACHINE_CONTEXT(th);
if (rb_ractor_status_p(cr, ractor_running)) {
rb_vm_ractor_blocking_cnt_inc(vm, cr, __FILE__, __LINE__);
running = true;
}
else {
running = false;
}
VM_ASSERT(rb_ractor_status_p(cr, ractor_blocking));
if (vm_barrier_finish_p(vm)) {
RUBY_DEBUG_LOG("wakeup barrier owner", 0);
rb_native_cond_signal(&vm->ractor.sync.barrier_cond);
}
else {
RUBY_DEBUG_LOG("wait for barrier finish", 0);
}
// wait for restart
while (barrier_cnt == vm->ractor.sync.barrier_cnt) {
vm->ractor.sync.lock_owner = NULL;
rb_native_cond_wait(&cr->barrier_wait_cond, &vm->ractor.sync.lock);
VM_ASSERT(vm->ractor.sync.lock_owner == NULL);
vm->ractor.sync.lock_owner = cr;
}
RUBY_DEBUG_LOG("barrier is released. Acquire vm_lock", 0);
if (running) {
rb_vm_ractor_blocking_cnt_dec(vm, cr, __FILE__, __LINE__);
}
}
VM_ASSERT(vm->ractor.sync.lock_rec == 0);
VM_ASSERT(vm->ractor.sync.lock_owner == cr);
}
vm->ractor.sync.lock_rec++;
*lev = vm->ractor.sync.lock_rec;
RUBY_DEBUG_LOG2(file, line, "rec:%u owner:%d", vm->ractor.sync.lock_rec, rb_ractor_id(vm->ractor.sync.lock_owner));
}
static void
vm_lock_leave(rb_vm_t *vm, unsigned int *lev APPEND_LOCATION_ARGS)
{
RUBY_DEBUG_LOG2(file, line, "rec:%u owner:%d", vm->ractor.sync.lock_rec, rb_ractor_id(vm->ractor.sync.lock_owner));
ASSERT_vm_locking();
VM_ASSERT(vm->ractor.sync.lock_rec > 0);
VM_ASSERT(vm->ractor.sync.lock_rec == *lev);
vm->ractor.sync.lock_rec--;
if (vm->ractor.sync.lock_rec == 0) {
vm->ractor.sync.lock_owner = NULL;
rb_native_mutex_unlock(&vm->ractor.sync.lock);
}
}
void
rb_vm_lock_enter_body(unsigned int *lev APPEND_LOCATION_ARGS)
{
rb_vm_t *vm = GET_VM();
vm_lock_enter(vm, vm_locked(vm), lev APPEND_LOCATION_PARAMS);
}
void
rb_vm_lock_leave_body(unsigned int *lev APPEND_LOCATION_ARGS)
{
vm_lock_leave(GET_VM(), lev APPEND_LOCATION_PARAMS);
}
void
rb_vm_lock_body(LOCATION_ARGS)
{
rb_vm_t *vm = GET_VM();
ASSERT_vm_unlocking();
vm_lock_enter(vm, false, &vm->ractor.sync.lock_rec APPEND_LOCATION_PARAMS);
}
void
rb_vm_unlock_body(LOCATION_ARGS)
{
rb_vm_t *vm = GET_VM();
ASSERT_vm_locking();
VM_ASSERT(vm->ractor.sync.lock_rec == 1);
vm_lock_leave(vm, &vm->ractor.sync.lock_rec APPEND_LOCATION_PARAMS);
}
static void
vm_cond_wait(rb_vm_t *vm, rb_nativethread_cond_t *cond, unsigned long msec)
{
ASSERT_vm_locking();
unsigned int lock_rec = vm->ractor.sync.lock_rec;
rb_ractor_t *cr = vm->ractor.sync.lock_owner;
vm->ractor.sync.lock_rec = 0;
vm->ractor.sync.lock_owner = NULL;
if (msec > 0) {
rb_native_cond_timedwait(cond, &vm->ractor.sync.lock, msec);
}
else {
rb_native_cond_wait(cond, &vm->ractor.sync.lock);
}
vm->ractor.sync.lock_rec = lock_rec;
vm->ractor.sync.lock_owner = cr;
}
void
rb_vm_cond_wait(rb_vm_t *vm, rb_nativethread_cond_t *cond)
{
vm_cond_wait(vm, cond, 0);
}
void
rb_vm_cond_timedwait(rb_vm_t *vm, rb_nativethread_cond_t *cond, unsigned long msec)
{
vm_cond_wait(vm, cond, msec);
}
static bool
vm_barrier_finish_p(rb_vm_t *vm)
{
RUBY_DEBUG_LOG("cnt:%u living:%u blocking:%u",
vm->ractor.sync.barrier_cnt,
vm->ractor.cnt,
vm->ractor.blocking_cnt);
VM_ASSERT(vm->ractor.blocking_cnt <= vm->ractor.cnt);
return vm->ractor.blocking_cnt == vm->ractor.cnt;
}
void
rb_vm_barrier(void)
{
if (!rb_multi_ractor_p()) {
// no other ractors
return;
}
else {
rb_vm_t *vm = GET_VM();
VM_ASSERT(vm->ractor.sync.barrier_waiting == false);
ASSERT_vm_locking();
rb_ractor_t *cr = vm->ractor.sync.lock_owner;
VM_ASSERT(cr == GET_RACTOR());
VM_ASSERT(rb_ractor_status_p(cr, ractor_running));
vm->ractor.sync.barrier_waiting = true;
RUBY_DEBUG_LOG("barrier start. cnt:%u living:%u blocking:%u",
vm->ractor.sync.barrier_cnt,
vm->ractor.cnt,
vm->ractor.blocking_cnt);
rb_vm_ractor_blocking_cnt_inc(vm, cr, __FILE__, __LINE__);
// send signal
rb_ractor_t *r = 0;
list_for_each(&vm->ractor.set, r, vmlr_node) {
if (r != cr) {
rb_ractor_vm_barrier_interrupt_running_thread(r);
}
}
// wait
while (!vm_barrier_finish_p(vm)) {
rb_vm_cond_wait(vm, &vm->ractor.sync.barrier_cond);
}
RUBY_DEBUG_LOG("cnt:%u barrier success", vm->ractor.sync.barrier_cnt);
rb_vm_ractor_blocking_cnt_dec(vm, cr, __FILE__, __LINE__);
vm->ractor.sync.barrier_waiting = false;
vm->ractor.sync.barrier_cnt++;
list_for_each(&vm->ractor.set, r, vmlr_node) {
rb_native_cond_signal(&r->barrier_wait_cond);
}
}
}
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