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#pragma once
#include "cancel.h"
#include "uniquekey.h"
#include "universe.h"
#include <latch>
// NOTE: values to be changed by either thread, during execution, without
// locking, are marked "volatile"
//
class Lane
{
private:
enum class ThreadStatus
{
Normal, // normal master side state
Killed // issued an OS kill
};
public:
using enum ThreadStatus;
THREAD_T thread;
std::latch m_ready{ 1 };
//
// M: sub-thread OS thread
// S: not used
char const* debug_name{ "<unnamed>" };
Universe* const U;
lua_State* L;
//
// M: prepares the state, and reads results
// S: while S is running, M must keep out of modifying the state
volatile enum e_status status{ PENDING };
//
// M: sets to PENDING (before launching)
// S: updates -> RUNNING/WAITING -> DONE/ERROR_ST/CANCELLED
SIGNAL_T* volatile waiting_on{ nullptr };
//
// When status is WAITING, points on the linda's signal the thread waits on, else nullptr
volatile CancelRequest cancel_request{ CancelRequest::None };
//
// M: sets to false, flags true for cancel request
// S: reads to see if cancel is requested
#if THREADWAIT_METHOD == THREADWAIT_CONDVAR
SIGNAL_T done_signal;
//
// M: Waited upon at lane ending (if Posix with no PTHREAD_TIMEDJOIN)
// S: sets the signal once cancellation is noticed (avoids a kill)
MUTEX_T done_lock;
//
// Lock required by 'done_signal' condition variable, protecting
// lane status changes to DONE/ERROR_ST/CANCELLED.
#endif // THREADWAIT_METHOD == THREADWAIT_CONDVAR
volatile ThreadStatus mstatus{ Normal };
//
// M: sets to Normal, if issued a kill changes to Killed
// S: not used
Lane* volatile selfdestruct_next{ nullptr };
//
// M: sets to non-nullptr if facing lane handle '__gc' cycle but the lane
// is still running
// S: cleans up after itself if non-nullptr at lane exit
#if HAVE_LANE_TRACKING()
Lane* volatile tracking_next{ nullptr };
#endif // HAVE_LANE_TRACKING()
//
// For tracking only
static void* operator new(size_t size_, Universe* U_) noexcept { return U_->internal_allocator.alloc(size_); }
// can't actually delete the operator because the compiler generates stack unwinding code that could call it in case of exception
static void operator delete(void* p_, Universe* U_) { U_->internal_allocator.free(p_, sizeof(Lane)); }
// this one is for us, to make sure memory is freed by the correct allocator
static void operator delete(void* p_) { static_cast<Lane*>(p_)->U->internal_allocator.free(p_, sizeof(Lane)); }
Lane(Universe* U_, lua_State* L_);
~Lane();
};
// xxh64 of string "LANE_POINTER_REGKEY" generated at https://www.pelock.com/products/hash-calculator
static constexpr UniqueKey LANE_POINTER_REGKEY{ 0xB3022205633743BCull }; // used as registry key
// To allow free-running threads (longer lifespan than the handle's)
// 'Lane' are malloc/free'd and the handle only carries a pointer.
// This is not deep userdata since the handle's not portable among lanes.
//
#define lua_toLane( L, i) (*((Lane**) luaL_checkudata( L, i, "Lane")))
int push_thread_status( lua_State* L, Lane* s);
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