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#include "Task.h"
#include "TaskMan.h"
#include "Exceptions.h"
#include "Printer.h"
#include "Local.h"
static Balau::LocalTmpl<Balau::Task> localTask;
Balau::Task::Task() {
m_status = STARTING;
m_okayToEAgain = false;
Printer::elog(E_TASK, "Created a Task at %p", this);
}
bool Balau::Task::needsStacks() {
#ifndef _WIN32
return true;
#else
return false;
#endif
}
void Balau::Task::setup(TaskMan * taskMan, void * stack) {
size_t size = stackSize();
#ifndef _WIN32
IAssert(stack, "Can't setup a coroutine without a stack");
m_stack = stack;
coro_create(&m_ctx, coroutineTrampoline, this, m_stack, size);
#else
Assert(!stack, "We shouldn't allocate stacks with Fibers");
m_stack = NULL;
m_fiber = CreateFiber(size, coroutineTrampoline, this);
#endif
m_taskMan = taskMan;
m_tls = g_tlsManager->createTLS();
void * oldTLS = g_tlsManager->getTLS();
g_tlsManager->setTLS(m_tls);
localTask.set(this);
g_tlsManager->setTLS(oldTLS);
}
Balau::Task::~Task() {
free(m_tls);
}
void Balau::Task::coroutineTrampoline(void * arg) {
Task * task = reinterpret_cast<Task *>(arg);
IAssert(task, "We didn't get a task to trampoline from... ?");
task->coroutine();
}
void Balau::Task::coroutine() {
try {
IAssert(m_status == STARTING, "The Task at %p was badly initialized ? m_status = %i", this, m_status);
m_status = RUNNING;
Do();
m_status = STOPPED;
}
catch (Exit & e) {
m_status = STOPPED;
TaskMan::stop(e.getCode());
}
catch (TestException & e) {
m_status = STOPPED;
Printer::log(M_ERROR, "Unit test failed: %s", e.getMsg());
TaskMan::stop(-1);
}
catch (RessourceException & e) {
m_status = STOPPED;
Printer::log(M_ERROR, "Got a ressource exhaustion problem: %s", e.getMsg());
const char * details = e.getDetails();
if (details)
Printer::log(M_ERROR, " %s", details);
TaskMan::stop(-1);
}
catch (GeneralException & e) {
Printer::log(M_WARNING, "Task %s at %p caused an exception: `%s' - stopping.", getName(), this, e.getMsg());
const char * details = e.getDetails();
if (details)
Printer::log(M_WARNING, " %s", details);
auto trace = e.getTrace();
for (String & str : trace)
Printer::log(M_DEBUG, "%s", str.to_charp());
m_status = FAULTED;
}
catch (...) {
Printer::log(M_WARNING, "Task %s at %p caused an unknown exception - stopping.", getName(), this);
m_status = FAULTED;
}
#ifndef _WIN32
coro_transfer(&m_ctx, &m_taskMan->m_returnContext);
#else
SwitchToFiber(m_taskMan->m_fiber);
#endif
}
void Balau::Task::switchTo() {
Printer::elog(E_TASK, "Switching to task %p - %s", this, getName());
IAssert(m_status == YIELDED || m_status == IDLE || m_status == STARTING, "The task at %p isn't either yielded, idle or starting... ? m_status = %i", this, m_status);
void * oldTLS = g_tlsManager->getTLS();
g_tlsManager->setTLS(m_tls);
if (m_status == YIELDED || m_status == IDLE)
m_status = RUNNING;
#ifndef _WIN32
coro_transfer(&m_taskMan->m_returnContext, &m_ctx);
#else
SwitchToFiber(m_fiber);
#endif
g_tlsManager->setTLS(oldTLS);
if (m_status == RUNNING)
m_status = IDLE;
}
void Balau::Task::yield(bool changeStatus) {
Printer::elog(E_TASK, "Task %p - %s yielding", this, getName());
if (changeStatus)
m_status = YIELDED;
#ifndef _WIN32
coro_transfer(&m_ctx, &m_taskMan->m_returnContext);
#else
SwitchToFiber(m_taskMan->m_fiber);
#endif
}
Balau::Task * Balau::Task::getCurrentTask() {
return localTask.get();
}
void Balau::Task::waitFor(Balau::Events::BaseEvent * e) {
Printer::elog(E_TASK, "Task %p - %s waits for event %p (%s)", this, getName(), e, ClassName(e).c_str());
e->registerOwner(this);
}
struct ev_loop * Balau::Task::getLoop() {
return getTaskMan()->getLoop();
}
void Balau::Events::BaseEvent::doSignal() {
Printer::elog(E_TASK, "Event at %p (%s) is signaled with cb %p and task %p", this, ClassName(this).c_str(), m_cb, m_task);
m_signal = true;
if (m_cb)
m_cb->gotEvent(this);
if (m_task) {
Printer::elog(E_TASK, "Signaling task %p (%s - %s)", m_task, m_task->getName(), ClassName(m_task).c_str());
m_task->getTaskMan()->signalTask(m_task);
}
}
Balau::Events::TaskEvent::TaskEvent(Task * taskWaited) : m_taskWaited(taskWaited), m_ack(false), m_distant(false) {
ScopeLock lock(m_taskWaited->m_eventLock);
m_taskWaited->m_waitedBy.push_back(this);
}
void Balau::Events::TaskEvent::signal() {
if (m_distant)
m_evt.send();
doSignal();
}
void Balau::Events::TaskEvent::gotOwner(Task * task) {
TaskMan * tm = task->getTaskMan();
m_evt.stop();
if (tm != m_taskWaited->getTaskMan()) {
m_evt.set(tm->getLoop());
m_evt.set<TaskEvent, &TaskEvent::evt_cb>(this);
m_evt.start();
m_distant = true;
} else {
m_distant = false;
}
}
Balau::Events::TaskEvent::~TaskEvent() {
if (!m_ack)
ack();
if (m_distant)
m_evt.stop();
}
void Balau::Events::TaskEvent::ack() {
AAssert(!m_ack, "You can't ack() a task event twice.");
bool deleted = false;
Task * t = m_taskWaited;
t->m_eventLock.enter();
for (auto i = t->m_waitedBy.begin(); i != t->m_waitedBy.end(); i++) {
if (*i == this) {
t->m_waitedBy.erase(i);
deleted = true;
break;
}
}
t->m_eventLock.leave();
Printer::elog(E_TASK, "TaskEvent at %p being ack; removing from the 'waited by' list of %p (%s - %s); deleted = %s", this, t, t->getName(), ClassName(t).c_str(), deleted ? "true" : "false");
IAssert(deleted, "We didn't find task %p in the waitedBy lists... ?", this);
m_ack = true;
reset();
}
void Balau::Events::Timeout::gotOwner(Task * task) {
m_evt.set(task->getLoop());
m_evt.start();
}
void Balau::Events::Async::gotOwner(Task * task) {
m_evt.set(task->getLoop());
m_evt.start();
}
void Balau::Events::Custom::gotOwner(Task * task) {
m_loop = task->getLoop();
}
void Balau::Task::yield(Events::BaseEvent * evt, bool interruptible) throw (GeneralException) {
Task * t = getCurrentTask();
if (evt)
t->waitFor(evt);
bool gotSignal;
do {
t->yield(evt == NULL);
Printer::elog(E_TASK, "operation back from yielding; interruptible = %s; okayToEAgain = %s", interruptible ? "true" : "false", t->m_okayToEAgain ? "true" : "false");
gotSignal = evt ? evt->gotSignal() : true;
} while ((!interruptible || !t->m_okayToEAgain) && !gotSignal);
if (!evt)
return;
if (interruptible && t->m_okayToEAgain && !evt->gotSignal()) {
Printer::elog(E_TASK, "operation is throwing an exception.");
throw EAgain(evt);
}
}
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