鸿蒙轻内核A核源码分析系列七—进程管理

extern INT32 LOS_Fork(UINT32 flags, const CHAR *name, const TSK_ENTRY_FUNC entry, UINT32 stackSize);
extern INT32 LOS_SetProcessPriority(INT32 pid, UINT16 prio);
extern INT32 LOS_GetProcessPriority(INT32 pid);
extern INT32 LOS_GetProcessScheduler(INT32 pid);
extern INT32 LOS_SetProcessScheduler(INT32 pid, UINT16 policy, UINT16 prio);
extern UINT32 LOS_GetCurrProcessID(VOID);
extern INT32 LOS_Wait(INT32 pid, USER INT32 *status, UINT32 options, VOID *rusage);
extern INT32 LOS_Waitid(INT32 pid, USER siginfo_t *info, UINT32 options, VOID *rusage);
extern INT32 LOS_GetCurrProcessGroupID(VOID);
extern INT32 LOS_GetProcessGroupID(UINT32 pid);
extern VOID LOS_Exit(INT32 status);
extern UINT32 LOS_GetSystemProcessMaximum(VOID);
#ifdef LOSCFG_SECURITY_CAPABILITY
extern BOOL LOS_CheckInGroups(UINT32 gid);
#endif
extern INT32 LOS_GetUserID(VOID);
extern INT32 LOS_GetGroupID(VOID);
extern INT32 LOS_GetUsedPIDList(UINT32 *pidList, INT32 pidMaxNum);
#ifdef LOSCFG_FS_VFS
struct fd_table_s *LOS_GetFdTable(UINT32 pid);
#endif

    typedef struct {
⑴      UINT32      groupID;         /**< Process group ID is the PID of the process that created the group */
        LOS_DL_LIST processList;     /**< List of processes under this process group */
        LOS_DL_LIST exitProcessList; /**< List of closed processes (zombie processes) under this group */
        LOS_DL_LIST groupList;       /**< Process group list */
    } ProcessGroup;
    typedef struct ProcessCB {
⑵      CHAR                 processName[OS_PCB_NAME_LEN]; /**< Process name */
        UINT32               processID;                    /**< Process ID */
        UINT16               processStatus;                /**< [15:4] Process Status; [3:0] The number of threads currently
                                                                running in the process */
        UINT16               consoleID;                    /**< The console id of task belongs  */
        UINT16               processMode;                  /**< Kernel Mode:0; User Mode:1; */
        UINT32               parentProcessID;              /**< Parent process ID */
⑶      UINT32               exitCode;                     /**< Process exit status */
⑷      LOS_DL_LIST          pendList;                     /**< Block list to which the process belongs */
        LOS_DL_LIST          childrenList;                 /**< Children process list */
        LOS_DL_LIST          exitChildList;                /**< Exit children process list */
        LOS_DL_LIST          siblingList;                  /**< Linkage in parent's children list */
        ProcessGroup         *group;                       /**< Process group to which a process belongs */
        LOS_DL_LIST          subordinateGroupList;         /**< Linkage in group list */
        UINT32               threadGroupID;                /**< Which thread group , is the main thread ID of the process */
        LOS_DL_LIST          threadSiblingList;            /**< List of threads under this process */
        volatile UINT32      threadNumber; /**< Number of threads alive under this process */
        UINT32               threadCount;  /**< Total number of threads created under this process */
⑸      LOS_DL_LIST          waitList;     /**< The process holds the waitLits to support wait/waitpid */
    #ifdef LOSCFG_KERNEL_SMP
        UINT32               timerCpu;     /**< CPU core number of this task is delayed or pended */
    #endif
        UINTPTR              sigHandler;   /**< Signal handler */
        sigset_t             sigShare;     /**< Signal share bit */
    #ifdef LOSCFG_KERNEL_LITEIPC
        ProcIpcInfo          *ipcInfo;      /**< Memory pool for lite ipc */
    #endif
    #ifdef LOSCFG_KERNEL_VM
        LosVmSpace           *vmSpace;     /**< VMM space for processes */
    #endif
    #ifdef LOSCFG_FS_VFS
        struct files_struct  *files;       /**< Files held by the process */
    #endif
        timer_t              timerID;      /**< ITimer */
    #ifdef LOSCFG_SECURITY_CAPABILITY
        User                *user;
        UINT32              capability;
    #endif
    #ifdef LOSCFG_SECURITY_VID
        TimerIdMap           timerIdMap;
    #endif
    #ifdef LOSCFG_DRIVERS_TZDRIVER
        struct Vnode        *execVnode;   /**< Exec bin of the process */
    #endif
        mode_t               umask;
    #ifdef LOSCFG_KERNEL_CPUP
        OsCpupBase           *processCpup; /**< Process cpu usage */
    #endif
        struct rlimit        *resourceLimit;
    } LosProcessCB;

STATIC INLINE BOOL OsProcessIsUnused(const LosProcessCB *processCB)
{
    return ((processCB->processStatus & OS_PROCESS_FLAG_UNUSED) != 0);
}
STATIC INLINE BOOL OsProcessIsInactive(const LosProcessCB *processCB)
{
    return ((processCB->processStatus & (OS_PROCESS_FLAG_UNUSED | OS_PROCESS_STATUS_INACTIVE)) != 0);
}
STATIC INLINE BOOL OsProcessIsDead(const LosProcessCB *processCB)
{
    return ((processCB->processStatus & (OS_PROCESS_FLAG_UNUSED | OS_PROCESS_STATUS_ZOMBIES)) != 0);
}
STATIC INLINE BOOL OsProcessIsInit(const LosProcessCB *processCB)
{
    return (processCB->processStatus & OS_PROCESS_STATUS_INIT);
}
STATIC INLINE BOOL OsProcessIsUserMode(const LosProcessCB *processCB)
{
    return (processCB->processMode == OS_USER_MODE);
}

/*
 * Process exit code
 * 31    15           8           7        0
 * |     | exit code  | core dump | signal |
 */
#define OS_PRO_EXIT_OK 0
STATIC INLINE VOID OsProcessExitCodeCoreDumpSet(LosProcessCB *processCB)
{
    processCB->exitCode |= 0x80U;
}
STATIC INLINE VOID OsProcessExitCodeSignalSet(LosProcessCB *processCB, UINT32 signal)
{
    processCB->exitCode |= signal & 0x7FU;
}
STATIC INLINE VOID OsProcessExitCodeSignalClear(LosProcessCB *processCB)
{
    processCB->exitCode &= (~0x7FU);
}
STATIC INLINE BOOL OsProcessExitCodeSignalIsSet(LosProcessCB *processCB)
{
    return (processCB->exitCode) & 0x7FU;
}
STATIC INLINE VOID OsProcessExitCodeSet(LosProcessCB *processCB, UINT32 code)
{
    processCB->exitCode |= ((code & 0x000000FFU) << 8U) & 0x0000FF00U; /* 8: Move 8 bits to the left, exitCode */
}