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#include "internal/gc.h"
#include "internal/thread.h"
#include "vm_core.h"
#include "vm_sync.h"
#include "ractor_core.h"
#include "vm_debug.h"
void rb_ractor_sched_barrier_start(rb_vm_t *vm, rb_ractor_t *cr);
void rb_ractor_sched_barrier_join(rb_vm_t *vm, rb_ractor_t *cr);
static bool
vm_locked(rb_vm_t *vm)
{
return vm->ractor.sync.lock_owner == GET_RACTOR();
}
#if RUBY_DEBUG > 0
void
RUBY_ASSERT_vm_locking(void)
{
if (rb_multi_ractor_p()) {
rb_vm_t *vm = GET_VM();
VM_ASSERT(vm_locked(vm));
}
}
void
RUBY_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_ractor_t *cr, rb_vm_t *vm, bool locked, bool no_barrier, unsigned int *lev APPEND_LOCATION_ARGS)
{
RUBY_DEBUG_LOG2(file, line, "start locked:%d", locked);
if (locked) {
ASSERT_vm_locking();
}
else {
#if RACTOR_CHECK_MODE
// locking ractor and acquire VM lock will cause deadlock
VM_ASSERT(cr->sync.locked_by != rb_ractor_self(cr));
#endif
// lock
rb_native_mutex_lock(&vm->ractor.sync.lock);
VM_ASSERT(vm->ractor.sync.lock_owner == NULL);
VM_ASSERT(vm->ractor.sync.lock_rec == 0);
#ifdef RUBY_THREAD_PTHREAD_H
if (!no_barrier &&
cr->threads.sched.running != NULL // ractor has running threads.
) {
while (vm->ractor.sched.barrier_waiting) {
RUBY_DEBUG_LOG("barrier serial:%u", vm->ractor.sched.barrier_serial);
rb_ractor_sched_barrier_join(vm, cr);
}
}
#else
if (!no_barrier) {
while (vm->ractor.sync.barrier_waiting) {
rb_ractor_sched_barrier_join(vm, cr);
}
}
#endif
VM_ASSERT(vm->ractor.sync.lock_rec == 0);
VM_ASSERT(vm->ractor.sync.lock_owner == NULL);
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:%u", vm->ractor.sync.lock_rec,
(unsigned int)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:%u%s", vm->ractor.sync.lock_rec,
(unsigned int)rb_ractor_id(vm->ractor.sync.lock_owner),
vm->ractor.sync.lock_rec == 1 ? " (leave)" : "");
ASSERT_vm_locking();
VM_ASSERT(vm->ractor.sync.lock_rec > 0);
VM_ASSERT(vm->ractor.sync.lock_rec == *lev);
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();
if (vm_locked(vm)) {
vm_lock_enter(NULL, vm, true, false, lev APPEND_LOCATION_PARAMS);
}
else {
vm_lock_enter(GET_RACTOR(), vm, false, false, lev APPEND_LOCATION_PARAMS);
}
}
void
rb_vm_lock_enter_body_nb(unsigned int *lev APPEND_LOCATION_ARGS)
{
rb_vm_t *vm = GET_VM();
if (vm_locked(vm)) {
vm_lock_enter(NULL, vm, true, true, lev APPEND_LOCATION_PARAMS);
}
else {
vm_lock_enter(GET_RACTOR(), vm, false, true, lev APPEND_LOCATION_PARAMS);
}
}
void
rb_vm_lock_enter_body_cr(rb_ractor_t *cr, unsigned int *lev APPEND_LOCATION_ARGS)
{
rb_vm_t *vm = GET_VM();
vm_lock_enter(cr, vm, vm_locked(vm), false, 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(GET_RACTOR(), vm, false, 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);
}
void
rb_vm_barrier(void)
{
RB_DEBUG_COUNTER_INC(vm_sync_barrier);
if (!rb_multi_ractor_p()) {
// no other ractors
return;
}
else {
rb_vm_t *vm = GET_VM();
VM_ASSERT(!vm->ractor.sched.barrier_waiting);
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));
rb_ractor_sched_barrier_start(vm, cr);
}
}
void
rb_ec_vm_lock_rec_release(const rb_execution_context_t *ec,
unsigned int recorded_lock_rec,
unsigned int current_lock_rec)
{
VM_ASSERT(recorded_lock_rec != current_lock_rec);
if (UNLIKELY(recorded_lock_rec > current_lock_rec)) {
rb_bug("unexpected situation - recordd:%u current:%u",
recorded_lock_rec, current_lock_rec);
}
else {
while (recorded_lock_rec < current_lock_rec) {
RB_VM_LOCK_LEAVE_LEV(¤t_lock_rec);
}
}
VM_ASSERT(recorded_lock_rec == rb_ec_vm_lock_rec(ec));
}
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