KernelLand/Kernel/include/threads_int.h

   1 /*
   2  * Acess2 Kernel
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * include/threads_int.h
   6  * - Internal Threading header
   7  * - Only for use by stuff that needs access to the thread type.
   8  */
   9 #ifndef _THREADS_INT_H_
  10 #define _THREADS_INT_H_
  11
  12 #include <threads.h>
  13 #include <proc.h>
  14 #include <timers_int.h>
  15 #include <posix_signals.h>
  16
  17 typedef struct sProcess tProcess;
  18
  19 /**
  20  * \brief IPC Message
  21  */
  22 typedef struct sMessage
  23 {
  24         struct sMessage *Next;  //!< Next message in thread's inbox
  25         tTID    Source; //!< Source thread ID
  26         Uint    Length; //!< Length of message data in bytes
  27         Uint8   Data[]; //!< Message data
  28 } tMsg;
  29
  30 /**
  31  * \brief Process state
  32  */
  33 struct sProcess
  34 {
  35         struct sProcess *Next;
  36         struct sProcess *Prev;
  37         tPGID   PGID;
  38         tPID    PID;
  39
  40          int    nThreads;
  41         struct sThread  *FirstThread;
  42
  43         tUID    UID;    //!< User ID
  44         tGID    GID;    //!< User and Group
  45         tMemoryState    MemState;
  46
  47          int    MaxFD;
  48         char    *CurrentWorkingDir;
  49         char    *RootDir;
  50
  51         void    *SignalHandlers[NSIGNALS];
  52 };
  53
  54 /**
  55  * \brief Core threading structure
  56  *
  57  */
  58 struct sThread
  59 {
  60         // --- threads.c's
  61         /**
  62          * \brief Next thread in current list
  63          * \note Required to be first for linked list hacks to work
  64          */
  65         struct sThread  *Next;
  66         struct sThread  *GlobalNext;    //!< Next thread in global list
  67         struct sThread  *GlobalPrev;    //!< Previous thread in global list
  68         struct sThread  *ProcessNext;
  69         tShortSpinlock  IsLocked;       //!< Thread's spinlock
  70         volatile int    Status;         //!< Thread Status
  71         void    *WaitPointer;   //!< What (Mutex/Thread/other) is the thread waiting on
  72          int    RetStatus;      //!< Return Status
  73
  74         tTID    TID;    //!< Thread ID
  75         struct sProcess *Process;       //!< Thread Group / Process
  76         struct sThread  *Parent;        //!< Parent Thread
  77         char    *ThreadName;    //!< Name of thread
  78
  79         struct sThread  *LastDeadChild; //!< Last child to die (will have the \a DeadChildren lock)
  80         tMutex  DeadChildLock;  //!< Lock to prevent clobbering of \a LastDeadChild, acquired by child, released by parent
  81
  82         // --- arch/proc.c's responsibility
  83         //! Kernel Stack Base
  84         tVAddr  KernelStack;
  85
  86         //! State on task switch
  87         tTaskState      SavedState;
  88
  89         // --- threads.c's
  90          int    CurFaultNum;    //!< Current fault number, 0: none
  91         tVAddr  FaultHandler;   //!< Fault Handler
  92
  93
  94          int    PendingSignal;  //!< Pending signal ID (0 = none)
  95
  96
  97         tMsg * volatile Messages;       //!< Message Queue
  98         tMsg    *LastMessage;   //!< Last Message (speeds up insertion)
  99
 100          int    Quantum, Remaining;     //!< Quantum Size and remaining timesteps
 101          int    Priority;       //!< Priority - 0: Realtime, higher means less time
 102
 103          int    _errno;
 104
 105         volatile int    CurCPU;
 106
 107         bool    bInstrTrace;
 108
 109         // --- event.c
 110         Uint32  EventState;
 111         // --- timer.c
 112         tTimer  ThreadTimer;
 113 };
 114
 115
 116 enum eThreadStatus {
 117         THREAD_STAT_NULL,       // Invalid process
 118         THREAD_STAT_ACTIVE,     // Running and schedulable process
 119         THREAD_STAT_SLEEPING,   // Message Sleep
 120         THREAD_STAT_MUTEXSLEEP, // Mutex Sleep
 121         THREAD_STAT_RWLOCKSLEEP,        // Read-Writer lock Sleep
 122         THREAD_STAT_SEMAPHORESLEEP,     // Semaphore Sleep
 123         THREAD_STAT_QUEUESLEEP, // Queue
 124         THREAD_STAT_EVENTSLEEP, // Event sleep
 125         THREAD_STAT_WAITING,    // ??? (Waiting for a thread)
 126         THREAD_STAT_PREINIT,    // Being created
 127         THREAD_STAT_ZOMBIE,     // Died/Killed, but parent not informed
 128         THREAD_STAT_DEAD,       // Awaiting burial (free)
 129         THREAD_STAT_BURIED      // If it's still on the list here, something's wrong
 130 };
 131 static const char * const casTHREAD_STAT[] = {
 132         "THREAD_STAT_NULL",
 133         "THREAD_STAT_ACTIVE",
 134         "THREAD_STAT_SLEEPING",
 135         "THREAD_STAT_MUTEXSLEEP",
 136         "THREAD_STAT_RWLOCKSLEEP",
 137         "THREAD_STAT_SEMAPHORESLEEP",
 138         "THREAD_STAT_QUEUESLEEP",
 139         "THREAD_STAT_EVENTSLEEP",
 140         "THREAD_STAT_WAITING",
 141         "THREAD_STAT_PREINIT",
 142         "THREAD_STAT_ZOMBIE",
 143         "THREAD_STAT_DEAD",
 144         "THREAD_STAT_BURIED"
 145 };
 146
 147 // === GLOBALS ===
 148 extern BOOL     gaThreads_NoTaskSwitch[MAX_CPUS];
 149 extern tShortSpinlock   glThreadListLock;
 150
 151 // === FUNCTIONS ===
 152 extern tThread  *Threads_GetThread(Uint TID);
 153 extern void     Threads_SetPriority(tThread *Thread, int Pri);
 154 extern int      Threads_Wake(tThread *Thread);
 155 extern void     Threads_Kill(tThread *Thread, int Status);
 156 extern void     Threads_AddActive(tThread *Thread);
 157 extern tThread  *Threads_RemActive(void);
 158 extern void     Threads_Delete(tThread *Thread);
 159 extern tThread  *Threads_GetNextToRun(int CPU, tThread *Last);
 160
 161 extern tThread  *Threads_CloneTCB(Uint Flags);
 162 extern tThread  *Threads_CloneThreadZero(void);
 163
 164 extern int      Threads_int_Sleep(enum eThreadStatus Status, void *Ptr, int Num, tThread **ListHead, tThread **ListTail, tShortSpinlock *Lock);
 165 extern void     Threads_int_WaitForStatusEnd(enum eThreadStatus Status);
 166 extern void     Semaphore_ForceWake(tThread *Thread);
 167
 168 #endif