LUA Learning Notes (vii)

Error HandlingASSERT (exp) error ("error message text") Pcall secure call Collaborative Programs  LUA is not really multi-threaded, it is a multi-threaded   LUA non-symmetric collaboration Program (Semi-coroutine) that uses a synergistic program, which provides two functions to handle execution   at any one time only one cooperative program executes   You can only hang yourself until you stop working, and you can't stop working from the outside.   as the producer consumer model mutually exclusive synergy   all the functions of the synergistic program are placed in the Coroutine table   CO = coroutine.create ( function () print ("wangning") end)   ASSERT (Type (CO) = = "Thread")   Create parameter is what the program executes, returning a variable of type thread   4 statuses: Suspend (suspended), run (running), Death (dead), normal   newly created co-program is pending, can check status   assert with status ( Coroutine.status (CO) = = "suspended")   Coroutine.resume (CO) is used to start or restart the co-program, changing the status to running  When the co-program executes the completion task function in the dead state   use Coroutine.yield () in the task function to suspend the cooperative program   and then call Coroutine.resume () to start the suspended co-operation again   If the co-program is already in the dead state, resume will return false failure   when the co-program a wakes up another cooperative program B, a will stop execution and b execution   then A's status is normal normal  You can use resume and yield to exchange data   the extra arguments for the first call to resume (the second one later), which will be treated as parameters of the co-program task function passed in   will be the return value for yield   The first return value of the resume indicates a successful failure, and the second value is the incoming parameter of yield   The return value of the function will be the additional return value of the resume when the task function of the co-operation is completed   CO = coroutine.create ( function (a,b,c)       print (A,B,C)       print (Coroutine.yield (4,5,6))       return 10  end)   res, a,b,c = Corouti Ne.resume (co,1,2,3)--1 2 3  print (RES,A,B,C)--True 4 5 6  res, d = Coroutine.resume (Co, 7,8,9)--&gt ; 7 8 9  Print (res, D)--True 10  print (Coroutine.resume (CO))--false cannot resume dead coroutine  can use a cooperative program responsible for the main task cycle, Judge other cooperative program state, have idle to make it execute, realize multithreading function  

Lua Learning Notes (vii)