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Schedule.cpp
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Schedule.cpp
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#include <assert.h>
#include "Schedule.h"
#include "PolledTimeout.h"
#include "interrupts.h"
#include "coredecls.h"
typedef std::function<void(void)> mSchedFuncT;
struct scheduled_fn_t
{
scheduled_fn_t* mNext = nullptr;
mSchedFuncT mFunc;
};
static scheduled_fn_t* sFirst = nullptr;
static scheduled_fn_t* sLast = nullptr;
static scheduled_fn_t* sUnused = nullptr;
static int sCount = 0;
typedef std::function<bool(void)> mRecFuncT;
struct recurrent_fn_t
{
recurrent_fn_t* mNext = nullptr;
mRecFuncT mFunc;
esp8266::polledTimeout::periodicFastUs callNow;
recurrent_fn_t (esp8266::polledTimeout::periodicFastUs interval): callNow(interval) { }
};
static recurrent_fn_t* rFirst = nullptr; // fifo not needed
// Returns a pointer to an unused sched_fn_t,
// or if none are available allocates a new one,
// or nullptr if limit is reached
IRAM_ATTR // called from ISR
static scheduled_fn_t* get_fn_unsafe ()
{
scheduled_fn_t* result = nullptr;
// try to get an item from unused items list
if (sUnused)
{
result = sUnused;
sUnused = sUnused->mNext;
}
// if no unused items, and count not too high, allocate a new one
else if (sCount < SCHEDULED_FN_MAX_COUNT)
{
result = new (std::nothrow) scheduled_fn_t;
if (result)
++sCount;
}
return result;
}
static void recycle_fn_unsafe (scheduled_fn_t* fn)
{
fn->mFunc = nullptr; // special overload in c++ std lib
fn->mNext = sUnused;
sUnused = fn;
}
IRAM_ATTR // (not only) called from ISR
bool schedule_function (const std::function<void(void)>& fn)
{
esp8266::InterruptLock lockAllInterruptsInThisScope;
scheduled_fn_t* item = get_fn_unsafe();
if (!item)
return false;
item->mFunc = fn;
item->mNext = nullptr;
if (sFirst)
sLast->mNext = item;
else
sFirst = item;
sLast = item;
return true;
}
bool schedule_recurrent_function_us (const std::function<bool(void)>& fn, uint32_t repeat_us)
{
assert(repeat_us < decltype(recurrent_fn_t::callNow)::neverExpires); //~26800000us (26.8s)
esp8266::InterruptLock lockAllInterruptsInThisScope;
recurrent_fn_t* item = new (std::nothrow) recurrent_fn_t(repeat_us);
if (!item)
return false;
item->mFunc = fn;
if (rFirst)
item->mNext = rFirst;
rFirst = item;
return true;
}
void run_scheduled_functions ()
{
esp8266::polledTimeout::periodicFastMs yieldNow(100); // yield every 100ms
while (sFirst)
{
sFirst->mFunc();
{
esp8266::InterruptLock lockAllInterruptsInThisScope;
auto to_recycle = sFirst;
sFirst = sFirst->mNext;
if (!sFirst)
sLast = nullptr;
recycle_fn_unsafe(to_recycle);
}
if (yieldNow)
{
// because scheduled function are allowed to last:
// this is yield() in cont stack:
esp_schedule();
cont_yield(g_pcont);
}
}
}
void run_scheduled_recurrent_functions ()
{
// Note to the reader:
// There is no exposed API to remove a scheduled function:
// Scheduled functions are removed only from this function, and
// its purpose is that it is never called from an interrupt
// (always on cont stack).
if (!rFirst)
return;
static bool fence = false;
{
// fence is like a mutex but as we are never called from ISR,
// locking is useless here. Leaving comment for reference.
//esp8266::InterruptLock lockAllInterruptsInThisScope;
if (fence)
// prevent recursive calls from yield()
// (even if they are not allowed)
return;
fence = true;
}
recurrent_fn_t* prev = nullptr;
recurrent_fn_t* current = rFirst;
while (current)
{
if (current->callNow && !current->mFunc())
{
// remove function from stack
esp8266::InterruptLock lockAllInterruptsInThisScope;
auto to_ditch = current;
if (prev)
{
current = current->mNext;
prev->mNext = current;
}
else
{
rFirst = rFirst->mNext;
current = rFirst;
}
delete(to_ditch);
}
else
{
prev = current;
current = current->mNext;
}
}
fence = false;
}