-
-/* Copyright (c) 2007-2015. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2007-2019. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
-#include "smx_private.h"
-#include "src/surf/cpu_interface.hpp"
-#include "src/surf/surf_interface.hpp"
-#include <xbt/ex.hpp>
-#include <xbt/log.h>
-
-#include "src/kernel/activity/SynchroRaw.hpp"
+#include "src/kernel/activity/ConditionVariableImpl.hpp"
+#include "src/kernel/activity/MutexImpl.hpp"
+#include "src/kernel/activity/SemaphoreImpl.hpp"
+#include "src/kernel/context/Context.hpp"
+#include "src/simix/smx_synchro_private.hpp"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_synchro, simix, "SIMIX Synchronization (mutex, semaphores and conditions)");
-static smx_activity_t SIMIX_synchro_wait(sg_host_t smx_host, double timeout);
-static void _SIMIX_cond_wait(smx_cond_t cond, smx_mutex_t mutex, double timeout,
- smx_actor_t issuer, smx_simcall_t simcall);
-static void _SIMIX_sem_wait(smx_sem_t sem, double timeout, smx_actor_t issuer,
- smx_simcall_t simcall);
-
/***************************** Raw synchronization *********************************/
-static smx_activity_t SIMIX_synchro_wait(sg_host_t smx_host, double timeout)
-{
- XBT_IN("(%p, %f)",smx_host,timeout);
-
- simgrid::kernel::activity::RawImplPtr sync =
- simgrid::kernel::activity::RawImplPtr(new simgrid::kernel::activity::RawImpl());
- sync->sleep = smx_host->pimpl_cpu->sleep(timeout);
- sync->sleep->setData(&*sync);
- XBT_OUT();
- return sync;
-}
-
void SIMIX_synchro_stop_waiting(smx_actor_t process, smx_simcall_t simcall)
{
XBT_IN("(%p, %p)",process,simcall);
switch (simcall->call) {
case SIMCALL_MUTEX_LOCK:
- xbt_swag_remove(process, simcall_mutex_lock__get__mutex(simcall)->sleeping);
+ simgrid::xbt::intrusive_erase(simcall_mutex_lock__get__mutex(simcall)->sleeping, *process);
break;
case SIMCALL_COND_WAIT:
- xbt_swag_remove(process, simcall_cond_wait__get__cond(simcall)->sleeping);
+ simgrid::xbt::intrusive_erase(simcall_cond_wait__get__cond(simcall)->sleeping_, *process);
break;
case SIMCALL_COND_WAIT_TIMEOUT:
- xbt_swag_remove(process, simcall_cond_wait_timeout__get__cond(simcall)->sleeping);
+ simgrid::xbt::intrusive_erase(simcall_cond_wait_timeout__get__cond(simcall)->sleeping_, *process);
+ simcall_cond_wait_timeout__set__result(simcall, 1); // signal a timeout
break;
case SIMCALL_SEM_ACQUIRE:
- xbt_swag_remove(process, simcall_sem_acquire__get__sem(simcall)->sleeping);
+ simgrid::xbt::intrusive_erase(simcall_sem_acquire__get__sem(simcall)->sleeping_, *process);
break;
case SIMCALL_SEM_ACQUIRE_TIMEOUT:
- xbt_swag_remove(process, simcall_sem_acquire_timeout__get__sem(simcall)->sleeping);
- break;
-
- default:
- THROW_IMPOSSIBLE;
- }
- XBT_OUT();
-}
-
-void SIMIX_synchro_finish(smx_activity_t synchro)
-{
- XBT_IN("(%p)",synchro);
- smx_simcall_t simcall = synchro->simcalls.front();
- synchro->simcalls.pop_front();
-
- switch (synchro->state) {
-
- case SIMIX_SRC_TIMEOUT:
- SMX_EXCEPTION(simcall->issuer, timeout_error, 0, "Synchro's wait timeout");
- break;
-
- case SIMIX_FAILED:
- simcall->issuer->context->iwannadie = 1;
-// SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
+ simgrid::xbt::intrusive_erase(simcall_sem_acquire_timeout__get__sem(simcall)->sleeping_, *process);
+ simcall_sem_acquire_timeout__set__result(simcall, 1); // signal a timeout
break;
default:
THROW_IMPOSSIBLE;
- break;
- }
-
- SIMIX_synchro_stop_waiting(simcall->issuer, simcall);
- simcall->issuer->waiting_synchro = nullptr;
- SIMIX_simcall_answer(simcall);
- XBT_OUT();
-}
-/*********************************** Mutex ************************************/
-
-namespace simgrid {
-namespace simix {
-
-MutexImpl::MutexImpl() : mutex_(this)
-{
- XBT_IN("(%p)", this);
- // Useful to initialize sleeping swag:
- simgrid::simix::ActorImpl p;
- this->sleeping = xbt_swag_new(xbt_swag_offset(p, synchro_hookup));
- XBT_OUT();
-}
-
-MutexImpl::~MutexImpl()
-{
- XBT_IN("(%p)", this);
- xbt_swag_free(this->sleeping);
- XBT_OUT();
-}
-
-void MutexImpl::lock(smx_actor_t issuer)
-{
- XBT_IN("(%p; %p)", this, issuer);
- /* FIXME: check where to validate the arguments */
- smx_activity_t synchro = nullptr;
-
- if (this->locked) {
- /* FIXME: check if the host is active ? */
- /* Somebody using the mutex, use a synchronization to get host failures */
- synchro = SIMIX_synchro_wait(issuer->host, -1);
- synchro->simcalls.push_back(&issuer->simcall);
- issuer->waiting_synchro = synchro;
- xbt_swag_insert(issuer, this->sleeping);
- } else {
- /* mutex free */
- this->locked = true;
- this->owner = issuer;
- SIMIX_simcall_answer(&issuer->simcall);
- }
- XBT_OUT();
-}
-
-/** Tries to lock the mutex for a process
- *
- * \param issuer the process that tries to acquire the mutex
- * \return whether we managed to lock the mutex
- */
-bool MutexImpl::try_lock(smx_actor_t issuer)
-{
- XBT_IN("(%p, %p)", this, issuer);
- if (this->locked) {
- XBT_OUT();
- return false;
- }
-
- this->locked = true;
- this->owner = issuer;
- XBT_OUT();
- return true;
-}
-
-/** Unlock a mutex for a process
- *
- * Unlocks the mutex and gives it to a process waiting for it.
- * If the unlocker is not the owner of the mutex nothing happens.
- * If there are no process waiting, it sets the mutex as free.
- */
-void MutexImpl::unlock(smx_actor_t issuer)
-{
- XBT_IN("(%p, %p)", this, issuer);
- if (not this->locked)
- THROWF(mismatch_error, 0, "Cannot release that mutex: it was not locked.");
-
- /* If the mutex is not owned by the issuer, that's not good */
- if (issuer != this->owner)
- THROWF(mismatch_error, 0, "Cannot release that mutex: it was locked by %s (pid:%ld), not by you.",
- this->owner->name.c_str(),this->owner->pid);
-
- if (xbt_swag_size(this->sleeping) > 0) {
- /*process to wake up */
- smx_actor_t p = (smx_actor_t) xbt_swag_extract(this->sleeping);
- p->waiting_synchro = nullptr;
- this->owner = p;
- SIMIX_simcall_answer(&p->simcall);
- } else {
- /* nobody to wake up */
- this->locked = false;
- this->owner = nullptr;
- }
- XBT_OUT();
-}
-
-}
-}
-
-/** Increase the refcount for this mutex */
-smx_mutex_t SIMIX_mutex_ref(smx_mutex_t mutex)
-{
- if (mutex != nullptr)
- intrusive_ptr_add_ref(mutex);
- return mutex;
-}
-
-/** Decrease the refcount for this mutex */
-void SIMIX_mutex_unref(smx_mutex_t mutex)
-{
- if (mutex != nullptr)
- intrusive_ptr_release(mutex);
-}
-
-smx_mutex_t simcall_HANDLER_mutex_init(smx_simcall_t simcall)
-{
- return new simgrid::simix::MutexImpl();
-}
-
-// Simcall handlers:
-
-void simcall_HANDLER_mutex_lock(smx_simcall_t simcall, smx_mutex_t mutex)
-{
- mutex->lock(simcall->issuer);
-}
-
-int simcall_HANDLER_mutex_trylock(smx_simcall_t simcall, smx_mutex_t mutex)
-{
- return mutex->try_lock(simcall->issuer);
-}
-
-void simcall_HANDLER_mutex_unlock(smx_simcall_t simcall, smx_mutex_t mutex)
-{
- mutex->unlock(simcall->issuer);
-}
-
-/********************************* Condition **********************************/
-
-/**
- * \brief Initialize a condition.
- *
- * Allocates and creates the data for the condition.
- * It have to be called before the use of the condition.
- * \return A condition
- */
-smx_cond_t SIMIX_cond_init()
-{
- XBT_IN("()");
- simgrid::simix::ActorImpl p;
- smx_cond_t cond = new s_smx_cond();
- cond->sleeping = xbt_swag_new(xbt_swag_offset(p, synchro_hookup));
- cond->refcount_ = 1;
- XBT_OUT();
- return cond;
-}
-
-/**
- * \brief Handle a condition waiting simcall without timeouts
- * \param simcall the simcall
- */
-void simcall_HANDLER_cond_wait(smx_simcall_t simcall, smx_cond_t cond, smx_mutex_t mutex)
-{
- XBT_IN("(%p)",simcall);
- smx_actor_t issuer = simcall->issuer;
-
- _SIMIX_cond_wait(cond, mutex, -1, issuer, simcall);
- XBT_OUT();
-}
-
-/**
- * \brief Handle a condition waiting simcall with timeouts
- * \param simcall the simcall
- */
-void simcall_HANDLER_cond_wait_timeout(smx_simcall_t simcall, smx_cond_t cond,
- smx_mutex_t mutex, double timeout)
-{
- XBT_IN("(%p)",simcall);
- smx_actor_t issuer = simcall->issuer;
-
- _SIMIX_cond_wait(cond, mutex, timeout, issuer, simcall);
- XBT_OUT();
-}
-
-
-static void _SIMIX_cond_wait(smx_cond_t cond, smx_mutex_t mutex, double timeout,
- smx_actor_t issuer, smx_simcall_t simcall)
-{
- XBT_IN("(%p, %p, %f, %p,%p)",cond,mutex,timeout,issuer,simcall);
- smx_activity_t synchro = nullptr;
-
- XBT_DEBUG("Wait condition %p", cond);
-
- /* If there is a mutex unlock it */
- /* FIXME: what happens if the issuer is not the owner of the mutex? */
- if (mutex != nullptr) {
- cond->mutex = mutex;
- mutex->unlock(issuer);
- }
-
- synchro = SIMIX_synchro_wait(issuer->host, timeout);
- synchro->simcalls.push_front(simcall);
- issuer->waiting_synchro = synchro;
- xbt_swag_insert(simcall->issuer, cond->sleeping);
- XBT_OUT();
-}
-
-/**
- * \brief Signalizes a condition.
- *
- * Signalizes a condition and wakes up a sleeping process.
- * If there are no process sleeping, no action is done.
- * \param cond A condition
- */
-void SIMIX_cond_signal(smx_cond_t cond)
-{
- XBT_IN("(%p)",cond);
- smx_actor_t proc = nullptr;
- smx_mutex_t mutex = nullptr;
- smx_simcall_t simcall = nullptr;
-
- XBT_DEBUG("Signal condition %p", cond);
-
- /* If there are processes waiting for the condition choose one and try
- to make it acquire the mutex */
- if ((proc = (smx_actor_t) xbt_swag_extract(cond->sleeping))) {
-
- /* Destroy waiter's synchronization */
- proc->waiting_synchro = nullptr;
-
- /* Now transform the cond wait simcall into a mutex lock one */
- simcall = &proc->simcall;
- if(simcall->call == SIMCALL_COND_WAIT)
- mutex = simcall_cond_wait__get__mutex(simcall);
- else
- mutex = simcall_cond_wait_timeout__get__mutex(simcall);
- simcall->call = SIMCALL_MUTEX_LOCK;
-
- simcall_HANDLER_mutex_lock(simcall, mutex);
}
XBT_OUT();
}
-
-/**
- * \brief Broadcasts a condition.
- *
- * Signal ALL processes waiting on a condition.
- * If there are no process waiting, no action is done.
- * \param cond A condition
- */
-void SIMIX_cond_broadcast(smx_cond_t cond)
-{
- XBT_IN("(%p)",cond);
- XBT_DEBUG("Broadcast condition %p", cond);
-
- /* Signal the condition until nobody is waiting on it */
- while (xbt_swag_size(cond->sleeping)) {
- SIMIX_cond_signal(cond);
- }
- XBT_OUT();
-}
-
-smx_cond_t SIMIX_cond_ref(smx_cond_t cond)
-{
- if (cond != nullptr)
- intrusive_ptr_add_ref(cond);
- return cond;
-}
-
-void SIMIX_cond_unref(smx_cond_t cond)
-{
- XBT_IN("(%p)",cond);
- XBT_DEBUG("Destroy condition %p", cond);
- if (cond != nullptr) {
- intrusive_ptr_release(cond);
- }
- XBT_OUT();
-}
-
-
-void intrusive_ptr_add_ref(s_smx_cond_t *cond)
-{
- auto previous = (cond->refcount_)++;
- xbt_assert(previous != 0);
-}
-
-void intrusive_ptr_release(s_smx_cond_t *cond)
-{
- auto count = --(cond->refcount_);
- if (count == 0) {
- xbt_assert(xbt_swag_size(cond->sleeping) == 0,
- "Cannot destroy conditional since someone is still using it");
- xbt_swag_free(cond->sleeping);
- delete cond;
- }
-}
-
-/******************************** Semaphores **********************************/
-/** @brief Initialize a semaphore */
-smx_sem_t SIMIX_sem_init(unsigned int value)
-{
- XBT_IN("(%u)",value);
- simgrid::simix::ActorImpl p;
-
- smx_sem_t sem = xbt_new0(s_smx_sem_t, 1);
- sem->sleeping = xbt_swag_new(xbt_swag_offset(p, synchro_hookup));
- sem->value = value;
- XBT_OUT();
- return sem;
-}
-
-/** @brief Destroys a semaphore */
-void SIMIX_sem_destroy(smx_sem_t sem)
-{
- XBT_IN("(%p)",sem);
- XBT_DEBUG("Destroy semaphore %p", sem);
- if (sem != nullptr) {
- xbt_assert(xbt_swag_size(sem->sleeping) == 0,
- "Cannot destroy semaphore since someone is still using it");
- xbt_swag_free(sem->sleeping);
- xbt_free(sem);
- }
- XBT_OUT();
-}
-
-void simcall_HANDLER_sem_release(smx_simcall_t simcall, smx_sem_t sem){
- SIMIX_sem_release(sem);
-}
-/** @brief release the semaphore
- *
- * Unlock a process waiting on the semaphore.
- * If no one was blocked, the semaphore capacity is increased by 1.
- */
-void SIMIX_sem_release(smx_sem_t sem)
-{
- XBT_IN("(%p)",sem);
- smx_actor_t proc;
-
- XBT_DEBUG("Sem release semaphore %p", sem);
- if ((proc = (smx_actor_t) xbt_swag_extract(sem->sleeping))) {
- proc->waiting_synchro = nullptr;
- SIMIX_simcall_answer(&proc->simcall);
- } else {
- sem->value++;
- }
- XBT_OUT();
-}
-
-/** @brief Returns true if acquiring this semaphore would block */
-int SIMIX_sem_would_block(smx_sem_t sem)
-{
- XBT_IN("(%p)",sem);
- XBT_OUT();
- return (sem->value <= 0);
-}
-
-int simcall_HANDLER_sem_get_capacity(smx_simcall_t simcall, smx_sem_t sem){
- return SIMIX_sem_get_capacity(sem);
-}
-/** @brief Returns the current capacity of the semaphore */
-int SIMIX_sem_get_capacity(smx_sem_t sem)
-{
- XBT_IN("(%p)",sem);
- XBT_OUT();
- return sem->value;
-}
-
-static void _SIMIX_sem_wait(smx_sem_t sem, double timeout, smx_actor_t issuer,
- smx_simcall_t simcall)
-{
- XBT_IN("(%p, %f, %p, %p)",sem,timeout,issuer,simcall);
- smx_activity_t synchro = nullptr;
-
- XBT_DEBUG("Wait semaphore %p (timeout:%f)", sem, timeout);
- if (sem->value <= 0) {
- synchro = SIMIX_synchro_wait(issuer->host, timeout);
- synchro->simcalls.push_front(simcall);
- issuer->waiting_synchro = synchro;
- xbt_swag_insert(issuer, sem->sleeping);
- } else {
- sem->value--;
- SIMIX_simcall_answer(simcall);
- }
- XBT_OUT();
-}
-
-/**
- * \brief Handles a sem acquire simcall without timeout.
- * \param simcall the simcall
- */
-void simcall_HANDLER_sem_acquire(smx_simcall_t simcall, smx_sem_t sem)
-{
- XBT_IN("(%p)",simcall);
- _SIMIX_sem_wait(sem, -1, simcall->issuer, simcall);
- XBT_OUT();
-}
-
-/**
- * \brief Handles a sem acquire simcall with timeout.
- * \param simcall the simcall
- */
-void simcall_HANDLER_sem_acquire_timeout(smx_simcall_t simcall, smx_sem_t sem, double timeout)
-{
- XBT_IN("(%p)",simcall);
- _SIMIX_sem_wait(sem, timeout, simcall->issuer, simcall);
- XBT_OUT();
-}
-int simcall_HANDLER_sem_would_block(smx_simcall_t simcall, smx_sem_t sem) {
- return SIMIX_sem_would_block(sem);
-}
